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+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Snapshotting of global state",
+            "homepage": "https://www.github.com/sebastianbergmann/global-state",
+            "keywords": [
+                "global state"
+            ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/global-state/issues",
+                "security": "https://github.com/sebastianbergmann/global-state/security/policy",
+                "source": "https://github.com/sebastianbergmann/global-state/tree/7.0.1"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-03-02T07:32:10+00:00"
+        },
+        {
+            "name": "sebastian/lines-of-code",
+            "version": "3.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/lines-of-code.git",
+                "reference": "376c5b3f6b43c78fdc049740bca76a7c846706c0"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/lines-of-code/zipball/376c5b3f6b43c78fdc049740bca76a7c846706c0",
+                "reference": "376c5b3f6b43c78fdc049740bca76a7c846706c0",
+                "shasum": ""
+            },
+            "require": {
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+                "php": ">=8.2"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^11.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "3.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Library for counting the lines of code in PHP source code",
+            "homepage": "https://github.com/sebastianbergmann/lines-of-code",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/lines-of-code/issues",
+                "security": "https://github.com/sebastianbergmann/lines-of-code/security/policy",
+                "source": "https://github.com/sebastianbergmann/lines-of-code/tree/3.0.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-02-02T06:00:36+00:00"
+        },
+        {
+            "name": "sebastian/object-enumerator",
+            "version": "6.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/object-enumerator.git",
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+            },
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+                "reference": "f75f6c460da0bbd9668f43a3dde0ec0ba7faa678",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.2",
+                "sebastian/object-reflector": "^4.0",
+                "sebastian/recursion-context": "^6.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^11.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "6.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Traverses array structures and object graphs to enumerate all referenced objects",
+            "homepage": "https://github.com/sebastianbergmann/object-enumerator/",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/object-enumerator/issues",
+                "security": "https://github.com/sebastianbergmann/object-enumerator/security/policy",
+                "source": "https://github.com/sebastianbergmann/object-enumerator/tree/6.0.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-02-02T06:01:29+00:00"
+        },
+        {
+            "name": "sebastian/object-reflector",
+            "version": "4.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/object-reflector.git",
+                "reference": "bb2a6255d30853425fd38f032eb64ced9f7f132d"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/object-reflector/zipball/bb2a6255d30853425fd38f032eb64ced9f7f132d",
+                "reference": "bb2a6255d30853425fd38f032eb64ced9f7f132d",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.2"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^11.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "4.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Allows reflection of object attributes, including inherited and non-public ones",
+            "homepage": "https://github.com/sebastianbergmann/object-reflector/",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/object-reflector/issues",
+                "security": "https://github.com/sebastianbergmann/object-reflector/security/policy",
+                "source": "https://github.com/sebastianbergmann/object-reflector/tree/4.0.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-02-02T06:02:18+00:00"
+        },
+        {
+            "name": "sebastian/recursion-context",
+            "version": "6.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/recursion-context.git",
+                "reference": "b75224967b5a466925c6d54e68edd0edf8dd4ed4"
+            },
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+                "reference": "b75224967b5a466925c6d54e68edd0edf8dd4ed4",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.2"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^11.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "6.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                },
+                {
+                    "name": "Jeff Welch",
+                    "email": "whatthejeff@gmail.com"
+                },
+                {
+                    "name": "Adam Harvey",
+                    "email": "aharvey@php.net"
+                }
+            ],
+            "description": "Provides functionality to recursively process PHP variables",
+            "homepage": "https://github.com/sebastianbergmann/recursion-context",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/recursion-context/issues",
+                "security": "https://github.com/sebastianbergmann/recursion-context/security/policy",
+                "source": "https://github.com/sebastianbergmann/recursion-context/tree/6.0.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-02-02T06:08:48+00:00"
+        },
+        {
+            "name": "sebastian/type",
+            "version": "5.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/type.git",
+                "reference": "b8502785eb3523ca0dd4afe9ca62235590020f3f"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/type/zipball/b8502785eb3523ca0dd4afe9ca62235590020f3f",
+                "reference": "b8502785eb3523ca0dd4afe9ca62235590020f3f",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.2"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^11.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "5.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Collection of value objects that represent the types of the PHP type system",
+            "homepage": "https://github.com/sebastianbergmann/type",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/type/issues",
+                "security": "https://github.com/sebastianbergmann/type/security/policy",
+                "source": "https://github.com/sebastianbergmann/type/tree/5.0.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-02-02T06:09:34+00:00"
+        },
+        {
+            "name": "sebastian/version",
+            "version": "5.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/version.git",
+                "reference": "13999475d2cb1ab33cb73403ba356a814fdbb001"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/version/zipball/13999475d2cb1ab33cb73403ba356a814fdbb001",
+                "reference": "13999475d2cb1ab33cb73403ba356a814fdbb001",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.2"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "5.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Library that helps with managing the version number of Git-hosted PHP projects",
+            "homepage": "https://github.com/sebastianbergmann/version",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/version/issues",
+                "security": "https://github.com/sebastianbergmann/version/security/policy",
+                "source": "https://github.com/sebastianbergmann/version/tree/5.0.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-02-02T06:10:47+00:00"
+        },
+        {
+            "name": "theseer/tokenizer",
+            "version": "1.2.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/theseer/tokenizer.git",
+                "reference": "737eda637ed5e28c3413cb1ebe8bb52cbf1ca7a2"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/theseer/tokenizer/zipball/737eda637ed5e28c3413cb1ebe8bb52cbf1ca7a2",
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+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-tokenizer": "*",
+                "ext-xmlwriter": "*",
+                "php": "^7.2 || ^8.0"
+            },
+            "type": "library",
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Arne Blankerts",
+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "A small library for converting tokenized PHP source code into XML and potentially other formats",
+            "support": {
+                "issues": "https://github.com/theseer/tokenizer/issues",
+                "source": "https://github.com/theseer/tokenizer/tree/1.2.3"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/theseer",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-03-03T12:36:25+00:00"
+        }
+    ],
+    "aliases": [],
+    "minimum-stability": "stable",
+    "stability-flags": [],
+    "prefer-stable": false,
+    "prefer-lowest": false,
+    "platform": [],
+    "platform-dev": [],
+    "plugin-api-version": "2.6.0"
+}
diff --git a/src/Configuration.php b/src/Configuration.php
new file mode 100644
index 0000000..dc54040
--- /dev/null
+++ b/src/Configuration.php
@@ -0,0 +1,32 @@
+<?php declare(strict_types=1);
+
+namespace BitBadger\PDODocument;
+
+/**
+ * Common configuration for the document library
+ */
+class Configuration
+{
+    /** @var string The name of the ID field used in the database (will be treated as the primary key) */
+    private static string $_idField = 'id';
+
+    /**
+     * Configure the ID field used by the library
+     *
+     * @param string $name The name of the ID field within each document
+     */
+    public static function useIdField(string $name): void
+    {
+        self::$_idField = $name;
+    }
+
+    /**
+     * Retrieve the ID field for documents within this library
+     *
+     * @return string The configured ID field
+     */
+    public static function idField(): string
+    {
+        return self::$_idField;
+    }
+}
diff --git a/src/DocumentException.php b/src/DocumentException.php
new file mode 100644
index 0000000..6e39c68
--- /dev/null
+++ b/src/DocumentException.php
@@ -0,0 +1,30 @@
+<?php declare(strict_types=1);
+
+namespace BitBadger\PDODocument;
+
+use Exception;
+use Throwable;
+
+/**
+ * Exceptions occurring during document processing
+ */
+class DocumentException extends Exception
+{
+    /**
+     * Constructor
+     *
+     * @param string $message A message for the exception
+     * @param int $code The code for the exception (optional; defaults to 0)
+     * @param Throwable|null $previous The previous exception (optional; defaults to `null`)
+     */
+    public function __construct(string $message, int $code = 0, ?Throwable $previous = null)
+    {
+        parent::__construct($message, $code, $previous);
+    }
+
+    public function __toString(): string
+    {
+        $codeStr = $this->code == 0 ? '' : "[$this->code] ";
+        return __CLASS__ . ": $codeStr$this->message\n";
+    }
+}
diff --git a/src/DocumentList.php b/src/DocumentList.php
new file mode 100644
index 0000000..7d5d872
--- /dev/null
+++ b/src/DocumentList.php
@@ -0,0 +1,36 @@
+<?php declare(strict_types=1);
+
+namespace BitBadger\PDODocument;
+
+use Generator;
+
+/**
+ * A lazy iterator of results in a list; implementations will create new connections to the database and close/dispose
+ * them as required once the results have been exhausted.
+ *
+ * @template TDoc The domain class for items returned by this list
+ */
+interface DocumentList
+{
+    /**
+     * The items from the query result
+     *
+     * @return Generator<TDoc> The query results as a lazily-iterated generator
+     */
+    public function items(): Generator;
+
+    /**
+     * Construct a new document list
+     *
+     * @param string $query The query to run to retrieve results
+     * @param array $parameters An associative array of parameters for the query
+     * @param Mapper<TDoc> $mapper A mapper to deserialize JSON documents
+     * @return static The `DocumentList`-implementing instance
+     */
+    public static function create(string $query, array $parameters, Mapper $mapper): static;
+
+    /**
+     * Clean up database connection resources
+     */
+    public function __destruct();
+}
diff --git a/src/Field.php b/src/Field.php
new file mode 100644
index 0000000..38c7f10
--- /dev/null
+++ b/src/Field.php
@@ -0,0 +1,176 @@
+<?php declare(strict_types=1);
+
+namespace BitBadger\PDODocument;
+
+/**
+ * Criteria for a field WHERE clause
+ */
+class Field
+{
+    /**
+     * Constructor
+     *
+     * NOTE: Use static construction methods rather than using this directly; different properties are required
+     *       depending on the operation being performed. This is only public so it can be tested.
+     *
+     * @param string $fieldName The name of the field
+     * @param Op $op The operation by which the field will be compared
+     * @param mixed $value The value of the field
+     * @param string $paramName The name of the parameter to which this should be bound
+     * @param string $qualifier A table qualifier for the `data` column
+     */
+    public function __construct(public string $fieldName = '', public Op $op = Op::EQ, public mixed $value = '',
+                                public string $paramName = '', public string $qualifier = '') { }
+
+    /**
+     * Append the parameter name and value to the given associative array
+     *
+     * @param array $existing The existing parameters
+     * @return array The given parameter array with this field's name and value appended
+     */
+    public function appendParameter(array $existing): array
+    {
+        switch ($this->op) {
+            case Op::EX:
+            case Op::NEX:
+                break;
+            case Op::BT:
+                $existing["{$this->paramName}min"] = $this->value[0];
+                $existing["{$this->paramName}max"] = $this->value[1];
+                break;
+            default:
+                $existing[$this->paramName] = $this->value;
+        }
+        return $existing;
+    }
+
+    /**
+     * Get the WHERE clause fragment for this parameter
+     *
+     * @return string The WHERE clause fragment for this parameter
+     */
+    public function toWhere(): string
+    {
+        $criteria = match ($this->op) {
+            Op::EX, Op::NEX => '',
+            Op::BT          => " {$this->paramName}min AND {$this->paramName}max",
+            default         => " $this->paramName"
+        };
+        $prefix = $this->qualifier == '' ? '' : "$this->qualifier.";
+        return "{$prefix}data->>'$this->fieldName' " . $this->op->toString() . $criteria;
+    }
+
+    /**
+     * Create an equals (=) field criterion
+     *
+     * @param string $fieldName The name of the field against which the value will be compared
+     * @param mixed $value The value for which equality will be checked
+     * @param string $paramName The name of the parameter to which this should be bound (optional; generated if blank)
+     * @return static The field with the requested criterion
+     */
+    public static function EQ(string $fieldName, mixed $value, string $paramName = ''): static
+    {
+        return new static($fieldName, Op::EQ, $value, $paramName);
+    }
+
+    /**
+     * Create a greater than (>) field criterion
+     *
+     * @param string $fieldName The name of the field against which the value will be compared
+     * @param mixed $value The value for the greater than comparison
+     * @param string $paramName The name of the parameter to which this should be bound (optional; generated if blank)
+     * @return static The field with the requested criterion
+     */
+    public static function GT(string $fieldName, mixed $value, string $paramName = ''): static
+    {
+        return new static($fieldName, Op::GT, $value, $paramName);
+    }
+
+    /**
+     * Create a greater than or equal to (>=) field criterion
+     *
+     * @param string $fieldName The name of the field against which the value will be compared
+     * @param mixed $value The value for the greater than or equal to comparison
+     * @param string $paramName The name of the parameter to which this should be bound (optional; generated if blank)
+     * @return static The field with the requested criterion
+     */
+    public static function GE(string $fieldName, mixed $value, string $paramName = ''): static
+    {
+        return new static($fieldName, Op::GE, $value, $paramName);
+    }
+
+    /**
+     * Create a less than (<) field criterion
+     *
+     * @param string $fieldName The name of the field against which the value will be compared
+     * @param mixed $value The value for the less than comparison
+     * @param string $paramName The name of the parameter to which this should be bound (optional; generated if blank)
+     * @return static The field with the requested criterion
+     */
+    public static function LT(string $fieldName, mixed $value, string $paramName = ''): static
+    {
+        return new static($fieldName, Op::LT, $value, $paramName);
+    }
+
+    /**
+     * Create a less than or equal to (<=) field criterion
+     *
+     * @param string $fieldName The name of the field against which the value will be compared
+     * @param mixed $value The value for the less than or equal to comparison
+     * @param string $paramName The name of the parameter to which this should be bound (optional; generated if blank)
+     * @return static The field with the requested criterion
+     */
+    public static function LE(string $fieldName, mixed $value, string $paramName = ''): static
+    {
+        return new static($fieldName, Op::LE, $value, $paramName);
+    }
+
+    /**
+     * Create a not equals (<>) field criterion
+     *
+     * @param string $fieldName The name of the field against which the value will be compared
+     * @param mixed $value The value for the not equals comparison
+     * @param string $paramName The name of the parameter to which this should be bound (optional; generated if blank)
+     * @return static The field with the requested criterion
+     */
+    public static function NE(string $fieldName, mixed $value, string $paramName = ''): static
+    {
+        return new static($fieldName, Op::NE, $value, $paramName);
+    }
+
+    /**
+     * Create a BETWEEN field criterion
+     *
+     * @param string $fieldName The name of the field against which the value will be compared
+     * @param mixed $minValue The lower value for range
+     * @param mixed $maxValue The upper value for the range
+     * @param string $paramName The name of the parameter to which this should be bound (optional; generated if blank)
+     * @return static The field with the requested criterion
+     */
+    public static function BT(string $fieldName, mixed $minValue, mixed $maxValue, string $paramName = ''): static
+    {
+        return new static($fieldName, Op::BT, [$minValue, $maxValue], $paramName);
+    }
+
+    /**
+     * Create an exists (IS NOT NULL) field criterion
+     *
+     * @param string $fieldName The name of the field for which existence will be checked
+     * @return static The field with the requested criterion
+     */
+    public static function EX(string $fieldName): static
+    {
+        return new static($fieldName, Op::EX, '', '');
+    }
+
+    /**
+     * Create a not exists (IS NULL) field criterion
+     *
+     * @param string $fieldName The name of the field for which non-existence will be checked
+     * @return static The field with the requested criterion
+     */
+    public static function NEX(string $fieldName): static
+    {
+        return new static($fieldName, Op::NEX, '', '');
+    }
+}
diff --git a/src/Mapper/ArrayMapper.php b/src/Mapper/ArrayMapper.php
new file mode 100644
index 0000000..62f1286
--- /dev/null
+++ b/src/Mapper/ArrayMapper.php
@@ -0,0 +1,17 @@
+<?php declare(strict_types=1);
+
+namespace BitBadger\PDODocument\Mapper;
+
+/**
+ * A mapper that returns the associative array from the database
+ */
+class ArrayMapper implements Mapper
+{
+    /**
+     * @inheritDoc
+     */
+    public function map(array $result): array
+    {
+        return $result;
+    }
+}
diff --git a/src/Mapper/JsonMapper.php b/src/Mapper/JsonMapper.php
new file mode 100644
index 0000000..10919b4
--- /dev/null
+++ b/src/Mapper/JsonMapper.php
@@ -0,0 +1,43 @@
+<?php declare(strict_types=1);
+
+namespace BitBadger\PDODocument\Mapper;
+
+use BitBadger\PDODocument\DocumentException;
+use JsonMapper_Exception;
+
+/**
+ * Map domain class instances from JSON documents
+ *
+ * @template TDoc The type of document returned by this mapper
+ * @implements Mapper<TDoc> Provide a mapping from JSON
+ */
+class JsonMapper implements Mapper
+{
+    /**
+     * Constructor
+     *
+     * @param class-string<TDoc> $className The type of class to be returned by this mapping
+     * @param string $fieldName The name of the field (optional; defaults to `data`)
+     */
+    public function __construct(public string $className, public string $fieldName = 'data') { }
+
+    /**
+     * Map a result to a domain class instance
+     *
+     * @param array $result An associative array representing a single database result
+     * @return TDoc The document, deserialized from its JSON representation
+     * @throws DocumentException If the JSON cannot be deserialized
+     */
+    public function map(array $result): mixed
+    {
+        try {
+            $json = json_decode($result[$this->fieldName]);
+            if (is_null($json)) {
+                throw new DocumentException("Could not map document for $this->className: " . json_last_error_msg());
+            }
+            return (new \JsonMapper())->map($json, $this->className);
+        } catch (JsonMapper_Exception $ex) {
+            throw new DocumentException("Could not map document for $this->className", previous: $ex);
+        }
+    }
+}
diff --git a/src/Mapper/Mapper.php b/src/Mapper/Mapper.php
new file mode 100644
index 0000000..5ed0ff2
--- /dev/null
+++ b/src/Mapper/Mapper.php
@@ -0,0 +1,19 @@
+<?php declare(strict_types=1);
+
+namespace BitBadger\PDODocument\Mapper;
+
+/**
+ * Map an associative array of results to a domain class
+ *
+ * @template T The type of document retrieved by this mapper
+ */
+interface Mapper
+{
+    /**
+     * Map a result to the specified type
+     *
+     * @param array $result An associative array representing a single database result
+     * @return T The item mapped from the given result
+     */
+    public function map(array $result): mixed;
+}
diff --git a/src/Mapper/StringMapper.php b/src/Mapper/StringMapper.php
new file mode 100644
index 0000000..3ed781f
--- /dev/null
+++ b/src/Mapper/StringMapper.php
@@ -0,0 +1,30 @@
+<?php declare(strict_types=1);
+
+namespace BitBadger\PDODocument\Mapper;
+
+/**
+ * Map a string result from the given
+ *
+ * @implements Mapper<string>
+ */
+class StringMapper implements Mapper
+{
+    /**
+     * Constructor
+     *
+     * @param string $fieldName The name of the field to be retrieved as a string
+     */
+    public function __construct(public string $fieldName) { }
+
+    /**
+     * @inheritDoc
+     */
+    public function map(array $result): ?string
+    {
+        return match (false) {
+            key_exists($this->fieldName, $result) => null,
+            is_string($result[$this->fieldName])  => "{$result[$this->fieldName]}",
+            default                               => $result[$this->fieldName]
+        };
+    }
+}
diff --git a/src/Op.php b/src/Op.php
new file mode 100644
index 0000000..9352fb9
--- /dev/null
+++ b/src/Op.php
@@ -0,0 +1,48 @@
+<?php declare(strict_types=1);
+
+namespace BitBadger\PDODocument;
+
+/**
+ * The types of logical operations allowed for JSON fields
+ */
+enum Op
+{
+    /** Equals (=) */
+    case EQ;
+    /** Greater Than (>) */
+    case GT;
+    /** Greater Than or Equal To (>=) */
+    case GE;
+    /** Less Than (<) */
+    case LT;
+    /** Less Than or Equal To (<=) */
+    case LE;
+    /** Not Equal to (<>) */
+    case NE;
+    /** Between (BETWEEN) */
+    case BT;
+    /** Exists (IS NOT NULL) */
+    case EX;
+    /** Does Not Exist (IS NULL) */
+    case NEX;
+
+    /**
+     * Get the string representation of this operator
+     *
+     * @return string The operator to use in SQL statements
+     */
+    public function toString(): string
+    {
+        return match ($this) {
+            Op::EQ  => "=",
+            Op::GT  => ">",
+            Op::GE  => ">=",
+            Op::LT  => "<",
+            Op::LE  => "<=",
+            Op::NE  => "<>",
+            Op::BT  => "BETWEEN",
+            Op::EX  => "IS NOT NULL",
+            Op::NEX => "IS NULL"
+        };
+    }
+}
diff --git a/src/Query.php b/src/Query.php
new file mode 100644
index 0000000..d9a265f
--- /dev/null
+++ b/src/Query.php
@@ -0,0 +1,77 @@
+<?php declare(strict_types=1);
+
+namespace BitBadger\PDODocument;
+
+/**
+ * Query construction functions
+ */
+class Query
+{
+    /**
+     * Create a SELECT clause to retrieve the document data from the given table
+     *
+     * @param string $tableName The name of the table from which document data should be retrieved
+     * @return string The SELECT clause to retrieve a document from the given table
+     */
+    public static function selectFromTable(string $tableName): string
+    {
+        return "SELECT data FROM $tableName";
+    }
+
+    /**
+     * Create a WHERE clause fragment to implement a comparison on fields in a JSON document
+     *
+     * @param Field[] $fields The field comparison to generate
+     * @param string $conjunction How to join multiple conditions (optional; defaults to AND)
+     * @return string The WHERE clause fragment matching the given fields and parameter
+     */
+    public static function whereByFields(array $fields, string $conjunction = 'AND'): string
+    {
+        return implode(" $conjunction ", array_map(fn($it) => $it->toWhere(), $fields));
+    }
+
+    /**
+     * Create a WHERE clause fragment to implement an ID-based query
+     *
+     * @param string $paramName The parameter name where the value of the ID will be provided (optional; default @id)
+     * @return string The WHERE clause fragment to match by ID
+     */
+    public static function whereById(string $paramName = '@id'): string
+    {
+        return self::whereByFields([Field::EQ(Configuration::idField(), 0, $paramName)]);
+    }
+
+    /**
+     * Query to insert a document
+     *
+     * @param string $tableName The name of the table into which a document should be inserted
+     * @return string The INSERT statement for the given table
+     */
+    public static function insert(string $tableName): string
+    {
+        return "INSERT INTO $tableName VALUES (@data)";
+    }
+
+    /**
+     * Query to save a document, inserting it if it does not exist and updating it if it does (AKA "upsert")
+     *
+     * @param string $tableName The name of the table into which a document should be saved
+     * @return string The INSERT...ON CONFLICT query for the document
+     */
+    public static function save(string $tableName): string
+    {
+        return self::insert($tableName)
+            . " ON CONFLICT ((data->>'" . Configuration::idField() . "')) DO UPDATE SET data = EXCLUDED.data";
+    }
+
+    /**
+     * Query to update a document
+     *
+     * @param string $tableName The name of the table in which the document should be updated
+     * @return string The UPDATE query for the document
+     */
+    public static function update(string $tableName): string
+    {
+        return "UPDATE $tableName SET data = @data WHERE " . self::whereById();
+    }
+}
diff --git a/src/Query/Count.php b/src/Query/Count.php
new file mode 100644
index 0000000..cc112f0
--- /dev/null
+++ b/src/Query/Count.php
@@ -0,0 +1,36 @@
+<?php declare(strict_types=1);
+
+namespace BitBadger\PDODocument\Query;
+
+use BitBadger\PDODocument\Field;
+use BitBadger\PDODocument\Query;
+
+/**
+ * Queries for counting documents
+ */
+class Count
+{
+    /**
+     * Query to count all documents in a table
+     *
+     * @param string $tableName The name of the table in which documents should be counted
+     * @return string The query to count all documents in a table
+     */
+    public static function all(string $tableName): string
+    {
+        return "SELECT COUNT(*) FROM $tableName";
+    }
+
+    /**
+     * Query to count matching documents using a text comparison on JSON fields
+     *
+     * @param string $tableName The name of the table in which documents should be counted
+     * @param Field[] $fields The field comparison to match
+     * @param string $conjunction How to handle multiple conditions (optional; defaults to `AND`)
+     * @return string The query to count documents using a field comparison
+     */
+    public static function byFields(string $tableName, array $fields, string $conjunction = 'AND'): string
+    {
+        return self::all($tableName) . ' WHERE ' . Query::whereByFields($fields, $conjunction);
+    }
+}
diff --git a/src/Query/Definition.php b/src/Query/Definition.php
new file mode 100644
index 0000000..802ec7a
--- /dev/null
+++ b/src/Query/Definition.php
@@ -0,0 +1,66 @@
+<?php declare(strict_types=1);
+
+namespace BitBadger\PDODocument\Query;
+
+use BitBadger\PDODocument\Configuration;
+
+/**
+ * Queries to define tables and indexes
+ */
+class Definition
+{
+    /**
+     * SQL statement to create a document table
+     *
+     * @param string $name The name of the table (including schema, if applicable)
+     * @param string $dataType The data type used for the document column
+     * @return string The CREATE TABLE statement for the document table
+     */
+    public static function ensureTableFor(string $name, string $dataType): string
+    {
+        return "CREATE TABLE IF NOT EXISTS $name (data $dataType NOT NULL)";
+    }
+
+    /**
+     * Split a schema and table name
+     *
+     * @param string $tableName The name of the table, possibly including the schema
+     * @return array|string[] An array with the schema at index 0 and the table name at index 1
+     */
+    private static function splitSchemaAndTable(string $tableName): array
+    {
+        $parts = explode('.', $tableName);
+        return sizeof($parts) == 1 ? ["", $tableName] : [$parts[0], $parts[1]];
+    }
+
+    /**
+     * SQL statement to create an index on one or more fields in a JSON document
+     *
+     * @param string $tableName The name of the table which should be indexed
+     * @param string $indexName The name of the index to create
+     * @param array $fields An array of fields to be indexed; may contain direction (ex. 'salary DESC')
+     * @return string The CREATE INDEX statement to ensure the index exists
+     */
+    public static function ensureIndexOn(string $tableName, string $indexName, array $fields): string
+    {
+        [, $tbl] = self::splitSchemaAndTable($tableName);
+        $jsonFields = implode(', ', array_map(function (string $field) {
+            $parts     = explode(' ', $field);
+            $fieldName = sizeof($parts) == 1 ? $field : $parts[0];
+            $direction = sizeof($parts) < 2 ? "" : " $parts[1]";
+            return "(data->>'$fieldName')$direction";
+        }, $fields));
+        return "CREATE INDEX IF NOT EXISTS idx_{$tbl}_$indexName ON $tableName ($jsonFields)";
+    }
+
+    /**
+     * SQL statement to create a key index for a document table
+     *
+     * @param string $tableName The name of the table whose key should be ensured
+     * @return string The CREATE INDEX statement to ensure the key index exists
+     */
+    public static function ensureKey(string $tableName): string
+    {
+        return str_replace('INDEX', 'UNIQUE INDEX', self::ensureIndexOn($tableName, 'key', [Configuration::idField()]));
+    }
+}
diff --git a/src/Query/Delete.php b/src/Query/Delete.php
new file mode 100644
index 0000000..d171bb7
--- /dev/null
+++ b/src/Query/Delete.php
@@ -0,0 +1,36 @@
+<?php declare(strict_types=1);
+
+namespace BitBadger\PDODocument\Query;
+
+use BitBadger\PDODocument\Field;
+use BitBadger\PDODocument\Query;
+
+/**
+ * Queries to delete documents
+ */
+class Delete
+{
+    /**
+     * Query to delete a document by its ID
+     *
+     * @param string $tableName The name of the table from which a document should be deleted
+     * @return string The DELETE statement to delete a document by its ID
+     */
+    public static function byId(string $tableName): string
+    {
+        return "DELETE FROM $tableName WHERE " . Query::whereById();
+    }
+
+    /**
+     * Query to delete documents using a comparison on JSON fields
+     *
+     * @param string $tableName The name of the table from which documents should be deleted
+     * @param Field[] $fields The field comparison to match
+     * @param string $conjunction How to handle multiple conditions (optional; defaults to `AND`)
+     * @return string The DELETE statement to delete documents via field comparison
+     */
+    public static function byFields(string $tableName, array $fields, string $conjunction = 'AND'): string
+    {
+        return "DELETE FROM $tableName WHERE " . Query::whereByFields($fields, $conjunction);
+    }
+}
diff --git a/src/Query/Exists.php b/src/Query/Exists.php
new file mode 100644
index 0000000..ba6d47d
--- /dev/null
+++ b/src/Query/Exists.php
@@ -0,0 +1,48 @@
+<?php declare(strict_types=1);
+
+namespace BitBadger\PDODocument\Query;
+
+use BitBadger\PDODocument\Field;
+use BitBadger\PDODocument\Query;
+
+/**
+ * Queries to determine document existence
+ */
+class Exists
+{
+    /**
+     * The shell of a query for an existence check
+     *
+     * @param string $tableName The name of the table in which existence should be checked
+     * @param string $whereClause The conditions for which existence should be checked
+     * @return string The query to determine existence of documents
+     */
+    public static function query(string $tableName, string $whereClause): string
+    {
+        return "SELECT EXISTS (SELECT 1 FROM $tableName WHERE $whereClause)";
+    }
+
+    /**
+     * Query to determine if a document exists for the given ID
+     *
+     * @param string $tableName The name of the table in which document existence should be checked
+     * @return string The query to determine document existence by ID
+     */
+    public static function byId(string $tableName): string
+    {
+        return self::query($tableName, Query::whereById());
+    }
+
+    /**
+     * Query to determine if documents exist using a comparison on JSON fields
+     *
+     * @param string $tableName The name of the table in which document existence should be checked
+     * @param Field[] $fields The field comparison to match
+     * @param string $conjunction How to handle multiple conditions (optional; defaults to `AND`)
+     * @return string The query to determine document existence by field comparison
+     */
+    public static function byFields(string $tableName, array $fields, string $conjunction = 'AND'): string
+    {
+        return self::query($tableName, Query::whereByFields($fields, $conjunction));
+    }
+}
diff --git a/src/Query/Find.php b/src/Query/Find.php
new file mode 100644
index 0000000..dcc08be
--- /dev/null
+++ b/src/Query/Find.php
@@ -0,0 +1,36 @@
+<?php declare(strict_types=1);
+
+namespace BitBadger\PDODocument\Query;
+
+use BitBadger\PDODocument\Field;
+use BitBadger\PDODocument\Query;
+
+/**
+ * Queries for retrieving documents
+ */
+class Find
+{
+    /**
+     * Query to retrieve a document by its ID
+     *
+     * @param string $tableName The name of the table from which a document should be retrieved
+     * @return string The SELECT statement to retrieve a document by its ID
+     */
+    public static function byId(string $tableName): string
+    {
+        return Query::selectFromTable($tableName) . ' WHERE ' . Query::whereById();
+    }
+
+    /**
+     * Query to retrieve documents using a comparison on JSON fields
+     *
+     * @param string $tableName The name of the table from which documents should be retrieved
+     * @param Field[] $fields The field comparison to match
+     * @param string $conjunction How to handle multiple conditions (optional; defaults to `AND`)
+     * @return string The SELECT statement to retrieve documents by field comparison
+     */
+    public static function byFields(string $tableName, array $fields, string $conjunction = 'AND'): string
+    {
+        return Query::selectFromTable($tableName) . ' WHERE ' . Query::whereByFields($fields, $conjunction);
+    }
+}
diff --git a/tests/integration/.gitkeep b/tests/integration/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/tests/unit/ConfigurationTest.php b/tests/unit/ConfigurationTest.php
new file mode 100644
index 0000000..c493a89
--- /dev/null
+++ b/tests/unit/ConfigurationTest.php
@@ -0,0 +1,28 @@
+<?php declare(strict_types=1);
+
+namespace Test\Unit;
+
+use BitBadger\PDODocument\Configuration;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Unit tests for the Configuration class
+ */
+class ConfigurationTest extends TestCase
+{
+    public function testIdFieldDefaultSucceeds(): void
+    {
+        $this->assertEquals('id', Configuration::idField(), 'Default ID field should be "id"');
+    }
+
+    public function testUseIdFieldSucceeds()
+    {
+        try {
+            Configuration::useIdField('EyeDee');
+            $this->assertEquals('EyeDee', Configuration::idField(), 'ID field should have been updated');
+        } finally {
+            Configuration::useIdField('id');
+            $this->assertEquals('id', Configuration::idField(), 'Default ID value should have been restored');
+        }
+    }
+}
diff --git a/tests/unit/DocumentExceptionTest.php b/tests/unit/DocumentExceptionTest.php
new file mode 100644
index 0000000..7103575
--- /dev/null
+++ b/tests/unit/DocumentExceptionTest.php
@@ -0,0 +1,46 @@
+<?php
+
+namespace Test\Unit;
+
+use BitBadger\PDODocument\DocumentException;
+use Exception;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Unit tests for the DocumentException class
+ */
+class DocumentExceptionTest extends TestCase
+{
+    public function testConstructorSucceedsWithCodeAndPriorException()
+    {
+        $priorEx = new Exception('Uh oh');
+        $ex = new DocumentException('Test Exception', 17, $priorEx);
+        $this->assertNotNull($ex, 'The exception should not have been null');
+        $this->assertEquals('Test Exception', $ex->getMessage(), 'Message not filled properly');
+        $this->assertEquals(17, $ex->getCode(), 'Code not filled properly');
+        $this->assertSame($priorEx, $ex->getPrevious(), 'Prior exception not filled properly');
+    }
+
+    public function testConstructorSucceedsWithoutCodeAndPriorException()
+    {
+        $ex = new DocumentException('Oops');
+        $this->assertNotNull($ex, 'The exception should not have been null');
+        $this->assertEquals('Oops', $ex->getMessage(), 'Message not filled properly');
+        $this->assertEquals(0, $ex->getCode(), 'Code not filled properly');
+        $this->assertNull($ex->getPrevious(), 'Prior exception should have been null');
+    }
+
+    public function testToStringSucceedsWithoutCode()
+    {
+        $ex = new DocumentException('Test failure');
+        $this->assertEquals("BitBadger\PDODocument\DocumentException: Test failure\n", "$ex",
+            'toString not generated correctly');
+    }
+
+    public function testToStringSucceedsWithCode()
+    {
+        $ex = new DocumentException('Oof', -6);
+        $this->assertEquals("BitBadger\PDODocument\DocumentException: [-6] Oof\n", "$ex",
+            'toString not generated correctly');
+    }
+}
diff --git a/tests/unit/FieldTest.php b/tests/unit/FieldTest.php
new file mode 100644
index 0000000..8294534
--- /dev/null
+++ b/tests/unit/FieldTest.php
@@ -0,0 +1,257 @@
+<?php declare(strict_types=1);
+
+namespace Test\Unit;
+
+use BitBadger\PDODocument\Field;
+use BitBadger\PDODocument\Op;
+use PHPUnit\Framework\Attributes\TestDox;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Unit tests for the Field class
+ */
+class FieldTest extends TestCase
+{
+    #[TestDox('Append parameter succeeds for EX')]
+    public function testAppendParameterSucceedsForEX(): void
+    {
+        $this->assertEquals([], Field::EX('exists')->appendParameter([]), 'EX should not have appended a parameter');
+    }
+
+    #[TestDox('Append parameter succeeds for NEX')]
+    public function testAppendParameterSucceedsForNEX(): void
+    {
+        $this->assertEquals([], Field::NEX('absent')->appendParameter([]), 'NEX should not have appended a parameter');
+    }
+
+    #[TestDox('Append parameter succeeds for BT')]
+    public function testAppendParameterSucceedsForBT(): void
+    {
+        $this->assertEquals(['@nummin' => 5, '@nummax' => 9], Field::BT('exists', 5, 9, '@num')->appendParameter([]),
+            'BT should have appended min and max parameters');
+    }
+
+    public function testAppendParameterSucceedsForOthers(): void
+    {
+        $this->assertEquals(['@test' => 33], Field::EQ('the_field', 33, '@test')->appendParameter([]),
+            'Field parameter not returned correctly');
+    }
+
+    #[TestDox('To where succeeds for EX without qualifier')]
+    public function testToWhereSucceedsForEXWithoutQualifier(): void
+    {
+        $this->assertEquals("data->>'that_field' IS NOT NULL", Field::EX('that_field')->toWhere(),
+            'WHERE fragment not generated correctly');
+    }
+
+    #[TestDox('To where succeeds for NEX without qualifier')]
+    public function testToWhereSucceedsForNEXWithoutQualifier(): void
+    {
+        $this->assertEquals("data->>'a_field' IS NULL", Field::NEX('a_field')->toWhere(),
+            'WHERE fragment not generated correctly');
+    }
+
+    #[TestDox('To where succeeds for BT without qualifier')]
+    public function testToWhereSucceedsForBTWithoutQualifier(): void
+    {
+        $this->assertEquals("data->>'age' BETWEEN @agemin AND @agemax", Field::BT('age', 13, 17, '@age')->toWhere(),
+            'WHERE fragment not generated correctly');
+    }
+
+    public function testToWhereSucceedsForOthersWithoutQualifier(): void
+    {
+        $this->assertEquals("data->>'some_field' = @value", Field::EQ('some_field', '', '@value')->toWhere(),
+            'WHERE fragment not generated correctly');
+    }
+
+    public function testToWhereSucceedsWithQualifierNoParameter(): void
+    {
+        $field = Field::EX('no_field');
+        $field->qualifier = 'test';
+        $this->assertEquals("test.data->>'no_field' IS NOT NULL", $field->toWhere(),
+            'WHERE fragment not generated correctly');
+    }
+
+    public function testToWhereSucceedsWithQualifierAndParameter(): void
+    {
+        $field = Field::LE('le_field', 18, '@it');
+        $field->qualifier = 'q';
+        $this->assertEquals("q.data->>'le_field' <= @it", $field->toWhere(), 'WHERE fragment not generated correctly');
+    }
+
+    #[TestDox('EQ succeeds without parameter')]
+    public function testEQSucceedsWithoutParameter(): void
+    {
+        $field = Field::EQ('my_test', 9);
+        $this->assertNotNull($field, 'The field should not have been null');
+        $this->assertEquals('my_test', $field->fieldName, 'Field name not filled correctly');
+        $this->assertEquals(Op::EQ, $field->op, 'Operation not filled correctly');
+        $this->assertEquals(9, $field->value, 'Value not filled correctly');
+        $this->assertEquals('', $field->paramName, 'Parameter name should have been blank');
+    }
+
+    #[TestDox('EQ succeeds with parameter')]
+    public function testEQSucceedsWithParameter(): void
+    {
+        $field = Field::EQ('another_test', 'turkey', '@test');
+        $this->assertNotNull($field, 'The field should not have been null');
+        $this->assertEquals('another_test', $field->fieldName, 'Field name not filled correctly');
+        $this->assertEquals(Op::EQ, $field->op, 'Operation not filled correctly');
+        $this->assertEquals('turkey', $field->value, 'Value not filled correctly');
+        $this->assertEquals('@test', $field->paramName, 'Parameter name not filled correctly');
+    }
+
+    #[TestDox('GT succeeds without parameter')]
+    public function testGTSucceedsWithoutParameter(): void
+    {
+        $field = Field::GT('your_test', 4);
+        $this->assertNotNull($field, 'The field should not have been null');
+        $this->assertEquals('your_test', $field->fieldName, 'Field name not filled correctly');
+        $this->assertEquals(Op::GT, $field->op, 'Operation not filled correctly');
+        $this->assertEquals(4, $field->value, 'Value not filled correctly');
+        $this->assertEquals('', $field->paramName, 'Parameter name should have been blank');
+    }
+
+    #[TestDox('GT succeeds with parameter')]
+    public function testGTSucceedsWithParameter(): void
+    {
+        $field = Field::GT('more_test', 'chicken', '@value');
+        $this->assertNotNull($field, 'The field should not have been null');
+        $this->assertEquals('more_test', $field->fieldName, 'Field name not filled correctly');
+        $this->assertEquals(Op::GT, $field->op, 'Operation not filled correctly');
+        $this->assertEquals('chicken', $field->value, 'Value not filled correctly');
+        $this->assertEquals('@value', $field->paramName, 'Parameter name not filled correctly');
+    }
+
+    #[TestDox('GE succeeds without parameter')]
+    public function testGESucceedsWithoutParameter(): void
+    {
+        $field = Field::GE('their_test', 6);
+        $this->assertNotNull($field, 'The field should not have been null');
+        $this->assertEquals('their_test', $field->fieldName, 'Field name not filled correctly');
+        $this->assertEquals(Op::GE, $field->op, 'Operation not filled correctly');
+        $this->assertEquals(6, $field->value, 'Value not filled correctly');
+        $this->assertEquals('', $field->paramName, 'Parameter name should have been blank');
+    }
+
+    #[TestDox('GE succeeds with parameter')]
+    public function testGESucceedsWithParameter(): void
+    {
+        $field = Field::GE('greater_test', 'poultry', '@cluck');
+        $this->assertNotNull($field, 'The field should not have been null');
+        $this->assertEquals('greater_test', $field->fieldName, 'Field name not filled correctly');
+        $this->assertEquals(Op::GE, $field->op, 'Operation not filled correctly');
+        $this->assertEquals('poultry', $field->value, 'Value not filled correctly');
+        $this->assertEquals('@cluck', $field->paramName, 'Parameter name not filled correctly');
+    }
+
+    #[TestDox('LT succeeds without parameter')]
+    public function testLTSucceedsWithoutParameter(): void
+    {
+        $field = Field::LT('z', 32);
+        $this->assertNotNull($field, 'The field should not have been null');
+        $this->assertEquals('z', $field->fieldName, 'Field name not filled correctly');
+        $this->assertEquals(Op::LT, $field->op, 'Operation not filled correctly');
+        $this->assertEquals(32, $field->value, 'Value not filled correctly');
+        $this->assertEquals('', $field->paramName, 'Parameter name should have been blank');
+    }
+
+    #[TestDox('LT succeeds with parameter')]
+    public function testLTSucceedsWithParameter(): void
+    {
+        $field = Field::LT('additional_test', 'fowl', '@boo');
+        $this->assertNotNull($field, 'The field should not have been null');
+        $this->assertEquals('additional_test', $field->fieldName, 'Field name not filled correctly');
+        $this->assertEquals(Op::LT, $field->op, 'Operation not filled correctly');
+        $this->assertEquals('fowl', $field->value, 'Value not filled correctly');
+        $this->assertEquals('@boo', $field->paramName, 'Parameter name not filled correctly');
+    }
+
+    #[TestDox('LE succeeds without parameter')]
+    public function testLESucceedsWithoutParameter(): void
+    {
+        $field = Field::LE('g', 87);
+        $this->assertNotNull($field, 'The field should not have been null');
+        $this->assertEquals('g', $field->fieldName, 'Field name not filled correctly');
+        $this->assertEquals(Op::LE, $field->op, 'Operation not filled correctly');
+        $this->assertEquals(87, $field->value, 'Value not filled correctly');
+        $this->assertEquals('', $field->paramName, 'Parameter name should have been blank');
+    }
+
+    #[TestDox('LE succeeds with parameter')]
+    public function testLESucceedsWithParameter(): void
+    {
+        $field = Field::LE('lesser_test', 'hen', '@woo');
+        $this->assertNotNull($field, 'The field should not have been null');
+        $this->assertEquals('lesser_test', $field->fieldName, 'Field name not filled correctly');
+        $this->assertEquals(Op::LE, $field->op, 'Operation not filled correctly');
+        $this->assertEquals('hen', $field->value, 'Value not filled correctly');
+        $this->assertEquals('@woo', $field->paramName, 'Parameter name not filled correctly');
+    }
+
+    #[TestDox('NE succeeds without parameter')]
+    public function testNESucceedsWithoutParameter(): void
+    {
+        $field = Field::NE('j', 65);
+        $this->assertNotNull($field, 'The field should not have been null');
+        $this->assertEquals('j', $field->fieldName, 'Field name not filled correctly');
+        $this->assertEquals(Op::NE, $field->op, 'Operation not filled correctly');
+        $this->assertEquals(65, $field->value, 'Value not filled correctly');
+        $this->assertEquals('', $field->paramName, 'Parameter name should have been blank');
+    }
+
+    #[TestDox('NE succeeds with parameter')]
+    public function testNESucceedsWithParameter(): void
+    {
+        $field = Field::NE('unequal_test', 'egg', '@zoo');
+        $this->assertNotNull($field, 'The field should not have been null');
+        $this->assertEquals('unequal_test', $field->fieldName, 'Field name not filled correctly');
+        $this->assertEquals(Op::NE, $field->op, 'Operation not filled correctly');
+        $this->assertEquals('egg', $field->value, 'Value not filled correctly');
+        $this->assertEquals('@zoo', $field->paramName, 'Parameter name not filled correctly');
+    }
+
+    #[TestDox('BT succeeds without parameter')]
+    public function testBTSucceedsWithoutParameter(): void
+    {
+        $field = Field::BT('k', 'alpha', 'zed');
+        $this->assertNotNull($field, 'The field should not have been null');
+        $this->assertEquals('k', $field->fieldName, 'Field name not filled correctly');
+        $this->assertEquals(Op::BT, $field->op, 'Operation not filled correctly');
+        $this->assertEquals(['alpha', 'zed'], $field->value, 'Value not filled correctly');
+        $this->assertEquals('', $field->paramName, 'Parameter name should have been blank');
+    }
+
+    #[TestDox('BT succeeds with parameter')]
+    public function testBTSucceedsWithParameter(): void
+    {
+        $field = Field::BT('between_test', 18, 49, '@count');
+        $this->assertNotNull($field, 'The field should not have been null');
+        $this->assertEquals('between_test', $field->fieldName, 'Field name not filled correctly');
+        $this->assertEquals(Op::BT, $field->op, 'Operation not filled correctly');
+        $this->assertEquals([18, 49], $field->value, 'Value not filled correctly');
+        $this->assertEquals('@count', $field->paramName, 'Parameter name not filled correctly');
+    }
+
+    #[TestDox('EX succeeds')]
+    public function testEXSucceeds(): void
+    {
+        $field = Field::EX('be_there');
+        $this->assertNotNull($field, 'The field should not have been null');
+        $this->assertEquals('be_there', $field->fieldName, 'Field name not filled correctly');
+        $this->assertEquals(Op::EX, $field->op, 'Operation not filled correctly');
+        $this->assertEquals('', $field->value, 'Value should have been blank');
+        $this->assertEquals('', $field->paramName, 'Parameter name should have been blank');
+    }
+
+    #[TestDox('NEX succeeds')]
+    public function testNEXSucceeds(): void
+    {
+        $field = Field::NEX('be_absent');
+        $this->assertNotNull($field, 'The field should not have been null');
+        $this->assertEquals('be_absent', $field->fieldName, 'Field name not filled correctly');
+        $this->assertEquals(Op::NEX, $field->op, 'Operation not filled correctly');
+        $this->assertEquals('', $field->value, 'Value should have been blank');
+        $this->assertEquals('', $field->paramName, 'Parameter name should have been blank');
+    }
+}
diff --git a/tests/unit/Mapper/ArrayMapperTest.php b/tests/unit/Mapper/ArrayMapperTest.php
new file mode 100644
index 0000000..51a8603
--- /dev/null
+++ b/tests/unit/Mapper/ArrayMapperTest.php
@@ -0,0 +1,19 @@
+<?php declare(strict_types=1);
+
+namespace Test\Unit\Mapper;
+
+use BitBadger\PDODocument\Mapper\ArrayMapper;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Unit tests for the ArrayMapper class
+ */
+class ArrayMapperTest extends TestCase
+{
+    public function testMapSucceeds(): void
+    {
+        $result = ['one' => 2, 'three' => 4, 'eight' => 'five'];
+        $mapped = (new ArrayMapper())->map($result);
+        $this->assertSame($result, $mapped, 'The array mapper should return the parameter given to it');
+    }
+}
diff --git a/tests/unit/Mapper/JsonMapperTest.php b/tests/unit/Mapper/JsonMapperTest.php
new file mode 100644
index 0000000..14e84ce
--- /dev/null
+++ b/tests/unit/Mapper/JsonMapperTest.php
@@ -0,0 +1,57 @@
+<?php declare(strict_types=1);
+
+namespace Test\Unit\Mapper;
+
+use BitBadger\PDODocument\DocumentException;
+use BitBadger\PDODocument\Field;
+use BitBadger\PDODocument\Mapper\JsonMapper;
+use PHPUnit\Framework\Attributes\TestDox;
+use PHPUnit\Framework\TestCase;
+
+// ** Test class hierarchy for serialization **
+
+class SubDocument
+{
+    public function __construct(public int $id = 0, public string $name = '') { }
+}
+
+class TestDocument
+{
+    public function __construct(public int $id = 0, public SubDocument $subDoc = new SubDocument()) { }
+}
+
+/**
+ * Unit tests for the JsonMapper class
+ */
+class JsonMapperTest extends TestCase
+{
+    public function testConstructorSucceedsWithDefaultField(): void
+    {
+        $mapper = new JsonMapper(Field::class);
+        $this->assertEquals('data', $mapper->fieldName, 'Default field name should have been "data"');
+    }
+
+    public function testConstructorSucceedsWithSpecifiedField(): void
+    {
+        $mapper = new JsonMapper(Field::class, 'json');
+        $this->assertEquals('json', $mapper->fieldName, 'Field name not recorded correctly');
+    }
+
+    #[TestDox('Map succeeds with valid JSON')]
+    public function testMapSucceedsWithValidJSON(): void
+    {
+        $doc = (new JsonMapper(TestDocument::class))->map(['data' => '{"id":7,"subDoc":{"id":22,"name":"tester"}}']);
+        $this->assertNotNull($doc, 'The document should not have been null');
+        $this->assertEquals(7, $doc->id, 'ID not filled correctly');
+        $this->assertNotNull($doc->subDoc, 'The sub-document should not have been null');
+        $this->assertEquals(22, $doc->subDoc->id, 'Sub-document ID not filled correctly');
+        $this->assertEquals('tester', $doc->subDoc->name, 'Sub-document name not filled correctly');
+    }
+
+    #[TestDox('Map fails with invalid JSON')]
+    public function testMapFailsWithInvalidJSON(): void
+    {
+        $this->expectException(DocumentException::class);
+        (new JsonMapper(TestDocument::class))->map(['data' => 'this is not valid']);
+    }
+}
diff --git a/tests/unit/Mapper/StringMapperTest.php b/tests/unit/Mapper/StringMapperTest.php
new file mode 100644
index 0000000..57c1c0a
--- /dev/null
+++ b/tests/unit/Mapper/StringMapperTest.php
@@ -0,0 +1,29 @@
+<?php declare(strict_types=1);
+
+namespace Test\Unit\Mapper;
+
+use BitBadger\PDODocument\Mapper\StringMapper;
+use PHPUnit\Framework\TestCase;
+
+class StringMapperTest extends TestCase
+{
+    public function testMapSucceedsWhenFieldIsPresentAndString()
+    {
+        $result = ['test_field' => 'test_value'];
+        $mapper = new StringMapper('test_field');
+        $this->assertEquals('test_value', $mapper->map($result), 'String value not returned correctly');
+    }
+
+    public function testMapSucceedsWhenFieldIsPresentAndNotString()
+    {
+        $result = ['a_number' => 6.7];
+        $mapper = new StringMapper('a_number');
+        $this->assertEquals('6.7', $mapper->map($result), 'Number value not returned correctly');
+    }
+
+    public function testMapSucceedsWhenFieldIsNotPresent()
+    {
+        $mapper = new StringMapper('something_else');
+        $this->assertNull($mapper->map([]), 'Missing value not returned correctly');
+    }
+}
diff --git a/tests/unit/OpTest.php b/tests/unit/OpTest.php
new file mode 100644
index 0000000..3cb3106
--- /dev/null
+++ b/tests/unit/OpTest.php
@@ -0,0 +1,67 @@
+<?php declare(strict_types=1);
+
+namespace Test\Unit;
+
+use BitBadger\PDODocument\Op;
+use PHPUnit\Framework\Attributes\TestDox;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Unit tests for the Op enumeration
+ */
+class OpTest extends TestCase
+{
+    #[TestDox('To string succeeds for EQ')]
+    public function testToStringSucceedsForEQ(): void
+    {
+        $this->assertEquals('=', Op::EQ->toString(), 'EQ operator incorrect');
+    }
+
+    #[TestDox('To string succeeds for GT')]
+    public function testToStringSucceedsForGT(): void
+    {
+        $this->assertEquals('>', Op::GT->toString(), 'GT operator incorrect');
+    }
+
+    #[TestDox('To string succeeds for GE')]
+    public function testToStringSucceedsForGE(): void
+    {
+        $this->assertEquals('>=', Op::GE->toString(), 'GE operator incorrect');
+    }
+
+    #[TestDox('To string succeeds for LT')]
+    public function testToStringSucceedsForLT(): void
+    {
+        $this->assertEquals('<', Op::LT->toString(), 'LT operator incorrect');
+    }
+
+    #[TestDox('To string succeeds for LE')]
+    public function testToStringSucceedsForLE(): void
+    {
+        $this->assertEquals('<=', Op::LE->toString(), 'LE operator incorrect');
+    }
+
+    #[TestDox('To string succeeds for NE')]
+    public function testToStringSucceedsForNE(): void
+    {
+        $this->assertEquals('<>', Op::NE->toString(), 'NE operator incorrect');
+    }
+
+    #[TestDox('To string succeeds for BT')]
+    public function testToStringSucceedsForBT(): void
+    {
+        $this->assertEquals('BETWEEN', Op::BT->toString(), 'BT operator incorrect');
+    }
+
+    #[TestDox('To string succeeds for EX')]
+    public function testToStringSucceedsForEX(): void
+    {
+        $this->assertEquals('IS NOT NULL', Op::EX->toString(), 'EX operator incorrect');
+    }
+
+    #[TestDox('To string succeeds for NEX')]
+    public function testToStringSucceedsForNEX(): void
+    {
+        $this->assertEquals('IS NULL', Op::NEX->toString(), 'NEX operator incorrect');
+    }
+}
diff --git a/tests/unit/Query/CountTest.php b/tests/unit/Query/CountTest.php
new file mode 100644
index 0000000..d0b6223
--- /dev/null
+++ b/tests/unit/Query/CountTest.php
@@ -0,0 +1,26 @@
+<?php declare(strict_types=1);
+
+namespace Test\Unit\Query;
+
+use BitBadger\PDODocument\Field;
+use BitBadger\PDODocument\Query\Count;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Unit tests for the Count class
+ */
+class CountTest extends TestCase
+{
+
+    public function testAllSucceeds()
+    {
+        $this->assertEquals('SELECT COUNT(*) FROM a_table', Count::all('a_table'),
+            'SELECT statement not generated correctly');
+    }
+
+    public function testByFieldsSucceeds()
+    {
+        $this->assertEquals("SELECT COUNT(*) FROM somewhere WHERE data->>'errors' > @errors",
+            Count::byFields('somewhere', [Field::GT('errors', 10, '@errors')]));
+    }
+}
diff --git a/tests/unit/Query/DefinitionTest.php b/tests/unit/Query/DefinitionTest.php
new file mode 100644
index 0000000..680b2e1
--- /dev/null
+++ b/tests/unit/Query/DefinitionTest.php
@@ -0,0 +1,38 @@
+<?php declare(strict_types=1);
+
+namespace Test\Unit\Query;
+
+use BitBadger\PDODocument\Query\Definition;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Unit tests for the Definition class
+ */
+class DefinitionTest extends TestCase
+{
+    public function testEnsureTableForSucceeds(): void
+    {
+        $this->assertEquals('CREATE TABLE IF NOT EXISTS documents (data JSON NOT NULL)',
+            Definition::ensureTableFor('documents', 'JSON'), 'CREATE TABLE statement not generated correctly');
+    }
+
+    public function testEnsureIndexOnSucceedsWithoutSchemaSingleAscendingField(): void
+    {
+        $this->assertEquals("CREATE INDEX IF NOT EXISTS idx_test_fields ON test ((data->>'details'))",
+            Definition::ensureIndexOn('test', 'fields', ['details']), 'CREATE INDEX statement not generated correctly');
+    }
+
+    public function testEnsureIndexOnSucceedsWithSchemaMultipleFields(): void
+    {
+        $this->assertEquals(
+            "CREATE INDEX IF NOT EXISTS idx_testing_json ON sch.testing ((data->>'group'), (data->>'sub_group') DESC)",
+            Definition::ensureIndexOn('sch.testing', 'json', ['group', 'sub_group DESC']),
+            'CREATE INDEX statement not generated correctly');
+    }
+
+    public function testEnsureKey(): void
+    {
+        $this->assertEquals("CREATE UNIQUE INDEX IF NOT EXISTS idx_tbl_key ON tbl ((data->>'id'))",
+            Definition::ensureKey('tbl'), 'CREATE INDEX statement for document key not generated correctly');
+    }
+}
diff --git a/tests/unit/Query/DeleteTest.php b/tests/unit/Query/DeleteTest.php
new file mode 100644
index 0000000..7921631
--- /dev/null
+++ b/tests/unit/Query/DeleteTest.php
@@ -0,0 +1,26 @@
+<?php declare(strict_types=1);
+
+namespace Test\Unit\Query;
+
+use BitBadger\PDODocument\Field;
+use BitBadger\PDODocument\Query\Delete;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Unit tests for the Delete class
+ */
+class DeleteTest extends TestCase
+{
+    public function testByIdSucceeds(): void
+    {
+        $this->assertEquals("DELETE FROM over_there WHERE data->>'id' = @id", Delete::byId('over_there'),
+            'DELETE statement not constructed correctly');
+    }
+
+    public function testByFieldsSucceeds(): void
+    {
+        $this->assertEquals("DELETE FROM my_table WHERE data->>'value' < @max AND data->>'value' >= @min",
+            Delete::byFields('my_table', [Field::LT('value', 99, '@max'), Field::GE('value', 18, '@min')]),
+            'DELETE statement not constructed correctly');
+    }
+}
diff --git a/tests/unit/Query/ExistsTest.php b/tests/unit/Query/ExistsTest.php
new file mode 100644
index 0000000..dcbf023
--- /dev/null
+++ b/tests/unit/Query/ExistsTest.php
@@ -0,0 +1,32 @@
+<?php declare(strict_types=1);
+
+namespace Test\Unit\Query;
+
+use BitBadger\PDODocument\Field;
+use BitBadger\PDODocument\Query\Exists;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Unit tests for the Exists class
+ */
+class ExistsTest extends TestCase
+{
+    public function testQuerySucceeds(): void
+    {
+        $this->assertEquals('SELECT EXISTS (SELECT 1 FROM abc WHERE def)', Exists::query('abc', 'def'),
+            'Existence query not generated correctly');
+    }
+
+    public function testByIdSucceeds(): void
+    {
+        $this->assertEquals("SELECT EXISTS (SELECT 1 FROM dox WHERE data->>'id' = @id)", Exists::byId('dox'),
+            'Existence query not generated correctly');
+    }
+
+    public function testByFieldsSucceeds(): void
+    {
+        $this->assertEquals("SELECT EXISTS (SELECT 1 FROM box WHERE data->>'status' <> @status)",
+            Exists::byFields('box', [Field::NE('status', 'occupied', '@status')]),
+            'Existence query not generated correctly');
+    }
+}
diff --git a/tests/unit/Query/FindTest.php b/tests/unit/Query/FindTest.php
new file mode 100644
index 0000000..1811caf
--- /dev/null
+++ b/tests/unit/Query/FindTest.php
@@ -0,0 +1,26 @@
+<?php declare(strict_types=1);
+
+namespace Test\Unit\Query;
+
+use BitBadger\PDODocument\Field;
+use BitBadger\PDODocument\Query\Find;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Unit tests for the Find class
+ */
+class FindTest extends TestCase
+{
+    public function testByIdSucceeds(): void
+    {
+        $this->assertEquals("SELECT data FROM here WHERE data->>'id' = @id", Find::byId('here'),
+            'SELECT query not generated correctly');
+    }
+
+    public function testByFieldsSucceeds(): void
+    {
+        $this->assertEquals("SELECT data FROM there WHERE data->>'active' = @act OR data->>'locked' = @lock",
+            Find::byFields('there', [Field::EQ('active', true, '@act'), Field::EQ('locked', true, '@lock')], 'OR'),
+            'SELECT query not generated correctly');
+    }
+}
diff --git a/tests/unit/QueryTest.php b/tests/unit/QueryTest.php
new file mode 100644
index 0000000..afdd261
--- /dev/null
+++ b/tests/unit/QueryTest.php
@@ -0,0 +1,68 @@
+<?php declare(strict_types=1);
+
+namespace Test\Unit;
+
+use BitBadger\PDODocument\Field;
+use BitBadger\PDODocument\Query;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Unit tests for the Query class
+ */
+class QueryTest extends TestCase
+{
+    public function testSelectFromTableSucceeds(): void
+    {
+        $this->assertEquals('SELECT data FROM testing', Query::selectFromTable('testing'),
+            'Query not constructed correctly');
+    }
+
+    public function testWhereByFieldsSucceedsForSingleField(): void
+    {
+        $this->assertEquals("data->>'test_field' <= @it",
+            Query::whereByFields([Field::LE('test_field', '', '@it')]), 'WHERE fragment not constructed correctly');
+    }
+
+    public function testWhereByFieldsSucceedsForMultipleFields(): void
+    {
+        $this->assertEquals("data->>'test_field' <= @it AND data->>'other_field' = @other",
+            Query::whereByFields([Field::LE('test_field', '', '@it'), Field::EQ('other_field', '', '@other')]),
+            'WHERE fragment not constructed correctly');
+    }
+
+    public function testWhereByFieldsSucceedsForMultipleFieldsWithOr(): void
+    {
+        $this->assertEquals("data->>'test_field' <= @it OR data->>'other_field' = @other",
+            Query::whereByFields([Field::LE('test_field', '', '@it'), Field::EQ('other_field', '', '@other')], 'OR'),
+            'WHERE fragment not constructed correctly');
+    }
+
+    public function testWhereByIdSucceedsWithDefaultParameter(): void
+    {
+        $this->assertEquals("data->>'id' = @id", Query::whereById(), 'WHERE fragment not constructed correctly');
+    }
+
+    public function testWhereByIdSucceedsWithSpecificParameter(): void
+    {
+        $this->assertEquals("data->>'id' = @di", Query::whereById('@di'), 'WHERE fragment not constructed correctly');
+    }
+
+    public function testInsertSucceeds(): void
+    {
+        $this->assertEquals('INSERT INTO my_table VALUES (@data)', Query::insert('my_table'),
+            'INSERT statement not constructed correctly');
+    }
+
+    public function testSaveSucceeds(): void
+    {
+        $this->assertEquals(
+            "INSERT INTO test_tbl VALUES (@data) ON CONFLICT ((data->>'id')) DO UPDATE SET data = EXCLUDED.data",
+            Query::save('test_tbl'), 'INSERT ON CONFLICT statement not constructed correctly');
+    }
+
+    public function testUpdateSucceeds()
+    {
+        $this->assertEquals("UPDATE testing SET data = @data WHERE data->>'id' = @id", Query::update('testing'),
+            'UPDATE statement not constructed correctly');
+    }
+}