diff --git a/README.md b/README.md
index 7da0a6f..2692701 100644
--- a/README.md
+++ b/README.md
@@ -8,6 +8,25 @@ This library allows SQLite (and, by v1.0.0-beta1, PostgreSQL) to be treated as a
 
 `composer require bit-badger/pdo-document`
 
+## Configuration
+
+### Connection Details
+
+The static variable `Configuration::$pdoDSN` must be set to the [PDO data source name](https://www.php.net/manual/en/pdo.construct.php#refsect1-pdo.construct-parameters) for your database. `Configuration` also has `$username`, `$password`, and `$options` variables that will be used to construct the PDO object it will use for data access.
+
+### Document Identifiers
+
+Each document must have a unique identifier. By default, the library assumes that this is a property or array key named `id`, but this can be controlled by setting `Configuration::$idField`. Once documents exist, this should not be changed.
+
+IDs can be generated automatically on insert. The `AutoId` enumeration has 4 values:
+
+- `AutoId::None` is the default; no IDs will be generated
+- `AutoId::Number` will assign max-ID-plus-one to documents with an ID of 0
+- `AutoId::UUID` will generate a v4 <abbr title="Universally Unique Identifier">UUID</abbr> for documents with an empty `string` ID
+- `AutoId::RandomString` will generate a string of letters and numbers for documents with an empty `string` ID; `Configuration::$idStringLength` controls the length of the generated string, and defaults to 16 characters
+
+In all generated scenarios, if the ID value is not 0 or blank, that ID will be used instead of a generated one.
+
 ## Usage
 
 Documentation for this library is not complete; however, its structure is very similar to the .NET version, so [its documentation will help](https://bitbadger.solutions/open-source/relational-documents/basic-usage.html) until its project specific documentation is developed. Things like `Count.All()` become `Count::all`, and all the `byField` operations are named `byFields` and take an array of fields.
diff --git a/composer.json b/composer.json
index 0cd85ed..7adb8c7 100644
--- a/composer.json
+++ b/composer.json
@@ -17,7 +17,7 @@
     "rss": "https://git.bitbadger.solutions/bit-badger/pdo-document.rss"
   },
   "require": {
-    "php": ">=8.3",
+    "php": ">=8.2",
     "netresearch/jsonmapper": "^4",
     "ext-pdo": "*"
   },
diff --git a/composer.lock b/composer.lock
index c9a364a..6d32386 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "ca79f450e8e715ad61ba3581734c0fe7",
+    "content-hash": "20bf0d96304e429b431535d05ff4585a",
     "packages": [
         {
             "name": "netresearch/jsonmapper",
@@ -1697,7 +1697,7 @@
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
-        "php": ">=8.3",
+        "php": ">=8.2",
         "ext-pdo": "*"
     },
     "platform-dev": [],
diff --git a/src/AutoId.php b/src/AutoId.php
new file mode 100644
index 0000000..222ca69
--- /dev/null
+++ b/src/AutoId.php
@@ -0,0 +1,51 @@
+<?php declare(strict_types=1);
+
+namespace BitBadger\PDODocument;
+
+use Random\RandomException;
+
+/**
+ * How automatic ID generation should be performed
+ */
+enum AutoId
+{
+    /** Do not automatically generate IDs */
+    case None;
+
+    /** New documents with a 0 ID should receive max ID plus one */
+    case Number;
+
+    /** New documents with a blank ID should receive a v4 UUID (Universally Unique Identifier) */
+    case UUID;
+
+    /** New documents with a blank ID should receive a random string (set `Configuration::$idStringLength`) */
+    case RandomString;
+
+    /**
+     * Generate a v4 UUID
+     *
+     * @return string The v4 UUID
+     * @throws RandomException If an appropriate source of randomness cannot be found
+     */
+    public static function generateUUID(): string
+    {
+        // hat tip: https://stackoverflow.com/a/15875555/276707
+        $bytes = random_bytes(16);
+
+        $bytes[6] = chr(ord($bytes[6]) & 0x0f | 0x40); // set version to 0100
+        $bytes[8] = chr(ord($bytes[8]) & 0x3f | 0x80); // set bits 6-7 to 10
+
+        return vsprintf('%s%s-%s-%s-%s-%s%s%s', str_split(bin2hex($bytes), 4));
+    }
+
+    /**
+     * Generate a random string ID
+     *
+     * @return string A string filled with the hexadecimal representation of random bytes
+     * @throws RandomException If an appropriate source of randomness cannot be found
+     */
+    public static function generateRandom(): string
+    {
+        return bin2hex(random_bytes(Configuration::$idStringLength / 2));
+    }
+}
diff --git a/src/Configuration.php b/src/Configuration.php
index c12a6ae..01a4598 100644
--- a/src/Configuration.php
+++ b/src/Configuration.php
@@ -12,6 +12,14 @@ class Configuration
     /** @var string The name of the ID field used in the database (will be treated as the primary key) */
     public static string $idField = 'id';
 
+    /** @var AutoId The automatic ID generation process to use */
+    public static AutoId $autoId = AutoId::None;
+
+    /**
+     * @var int The number of characters a string generated by `AutoId::RandomString` will have (must be an even number)
+     */
+    public static int $idStringLength = 16;
+
     /** @var string The data source name (DSN) of the connection string */
     public static string $pdoDSN = '';
 
@@ -59,7 +67,9 @@ class Configuration
         return self::$_pdo;
     }
 
-
+    /**
+     * Clear the current PDO instance
+     */
     public static function resetPDO(): void
     {
         self::$_pdo = null;
diff --git a/src/Count.php b/src/Count.php
index df91c72..62b2513 100644
--- a/src/Count.php
+++ b/src/Count.php
@@ -26,14 +26,14 @@ class Count
      *
      * @param string $tableName The name of the table in which documents should be counted
      * @param array|Field[] $fields The field comparison to match
-     * @param string $conjunction How to handle multiple conditions (optional; defaults to `AND`)
+     * @param FieldMatch|null $match How to handle multiple conditions (optional; defaults to All)
      * @return int The count of documents matching the field comparison
      * @throws DocumentException If one is encountered
      */
-    public static function byFields(string $tableName, array $fields, string $conjunction = 'AND'): int
+    public static function byFields(string $tableName, array $fields, ?FieldMatch $match = null): int
     {
         $namedFields = Parameters::nameFields($fields);
-        return Custom::scalar(Query\Count::byFields($tableName, $namedFields, $conjunction),
+        return Custom::scalar(Query\Count::byFields($tableName, $namedFields, $match),
             Parameters::addFields($namedFields, []), new CountMapper());
     }
 }
diff --git a/src/Delete.php b/src/Delete.php
index 00a408f..ee4fcb8 100644
--- a/src/Delete.php
+++ b/src/Delete.php
@@ -24,13 +24,13 @@ class Delete
      *
      * @param string $tableName The table from which documents should be deleted
      * @param array|Field[] $fields The field comparison to match
-     * @param string $conjunction How to handle multiple conditions (optional; defaults to `AND`)
+     * @param FieldMatch|null $match How to handle multiple conditions (optional; defaults to All)
      * @throws DocumentException If any is encountered
      */
-    public static function byFields(string $tableName, array $fields, string $conjunction = 'AND'): void
+    public static function byFields(string $tableName, array $fields, ?FieldMatch $match = null): void
     {
         $namedFields = Parameters::nameFields($fields);
-        Custom::nonQuery(Query\Delete::byFields($tableName, $namedFields, $conjunction),
+        Custom::nonQuery(Query\Delete::byFields($tableName, $namedFields, $match),
             Parameters::addFields($namedFields, []));
     }
 }
diff --git a/src/Document.php b/src/Document.php
index 5f14323..ad645d4 100644
--- a/src/Document.php
+++ b/src/Document.php
@@ -16,7 +16,25 @@ class Document
      */
     public static function insert(string $tableName, array|object $document): void
     {
-        Custom::nonQuery(Query::insert($tableName), Parameters::json(':data', $document));
+        $doInsert = fn() => Custom::nonQuery(Query::insert($tableName), Parameters::json(':data', $document));
+
+        if (Configuration::$autoId == AutoId::None) {
+            $doInsert();
+            return;
+        }
+
+        $id = Configuration::$idField;
+        $idProvided =
+               (is_array( $document) && is_int(   $document[$id])   && $document[$id]   <>  0)
+            || (is_array( $document) && is_string($document[$id])   && $document[$id]   <> '')
+            || (is_object($document) && is_int(   $document->{$id}) && $document->{$id} <>  0)
+            || (is_object($document) && is_string($document->{$id}) && $document->{$id} <> '');
+
+        if ($idProvided) {
+            $doInsert();
+        } else {
+            Custom::nonQuery(Query::insert($tableName, Configuration::$autoId), Parameters::json(':data', $document));
+        }
     }
 
     /**
diff --git a/src/Exists.php b/src/Exists.php
index 11548d4..bc9e1a5 100644
--- a/src/Exists.php
+++ b/src/Exists.php
@@ -27,14 +27,14 @@ class Exists
      *
      * @param string $tableName The name of the table in which document existence should be determined
      * @param Field[] $fields The field comparison to match
-     * @param string $conjunction How to handle multiple conditions (optional; defaults to `AND`)
+     * @param FieldMatch|null $match How to handle multiple conditions (optional; defaults to All)
      * @return bool True if any documents match the field comparison, false if not
      * @throws DocumentException If any is encountered
      */
-    public static function byFields(string $tableName, array $fields, string $conjunction = 'AND'): bool
+    public static function byFields(string $tableName, array $fields, ?FieldMatch $match = null): bool
     {
         $namedFields = Parameters::nameFields($fields);
-        return Custom::scalar(Query\Exists::byFields($tableName, $namedFields, $conjunction),
+        return Custom::scalar(Query\Exists::byFields($tableName, $namedFields, $match),
             Parameters::addFields($namedFields, []), new ExistsMapper());
     }
 }
diff --git a/src/FieldMatch.php b/src/FieldMatch.php
new file mode 100644
index 0000000..6cb7b6d
--- /dev/null
+++ b/src/FieldMatch.php
@@ -0,0 +1,28 @@
+<?php declare(strict_types=1);
+
+namespace BitBadger\PDODocument;
+
+/**
+ * How multiple fields should be matched
+ */
+enum FieldMatch
+{
+    /** Match all provided fields (`AND`) */
+    case All;
+
+    /** Match any provided fields (`OR`) */
+    case Any;
+
+    /**
+     * Get the SQL keyword for this enumeration value
+     *
+     * @return string The SQL keyword for this enumeration value
+     */
+    public function toString(): string
+    {
+        return match ($this) {
+            FieldMatch::All => 'AND',
+            FieldMatch::Any => 'OR'
+        };
+    }
+}
diff --git a/src/Find.php b/src/Find.php
index a3bb007..aae5b35 100644
--- a/src/Find.php
+++ b/src/Find.php
@@ -45,15 +45,15 @@ class Find
      * @param string $tableName The table from which documents should be retrieved
      * @param array|Field[] $fields The field comparison to match
      * @param class-string<TDoc> $className The name of the class to be retrieved
-     * @param string $conjunction How to handle multiple conditions (optional; defaults to `AND`)
+     * @param FieldMatch|null $match How to handle multiple conditions (optional; defaults to All)
      * @return DocumentList<TDoc> A list of documents matching the given field comparison
      * @throws DocumentException If any is encountered
      */
     public static function byFields(string $tableName, array $fields, string $className,
-                                    string $conjunction = 'AND'): DocumentList
+                                    ?FieldMatch $match = null): DocumentList
     {
         $namedFields = Parameters::nameFields($fields);
-        return Custom::list(Query\Find::byFields($tableName, $namedFields, $conjunction),
+        return Custom::list(Query\Find::byFields($tableName, $namedFields, $match),
             Parameters::addFields($namedFields, []), new DocumentMapper($className));
     }
 
@@ -64,15 +64,15 @@ class Find
      * @param string $tableName The table from which the document should be retrieved
      * @param array|Field[] $fields The field comparison to match
      * @param class-string<TDoc> $className The name of the class to be retrieved
-     * @param string $conjunction How to handle multiple conditions (optional; defaults to `AND`)
+     * @param FieldMatch|null $match How to handle multiple conditions (optional; defaults to All)
      * @return false|TDoc The first document if any matches are found, false otherwise
      * @throws DocumentException If any is encountered
      */
     public static function firstByFields(string $tableName, array $fields, string $className,
-                                         string $conjunction = 'AND'): mixed
+                                         ?FieldMatch $match = null): mixed
     {
         $namedFields = Parameters::nameFields($fields);
-        return Custom::single(Query\Find::byFields($tableName, $namedFields, $conjunction),
+        return Custom::single(Query\Find::byFields($tableName, $namedFields, $match),
             Parameters::addFields($namedFields, []), new DocumentMapper($className));
     }
 }
diff --git a/src/Patch.php b/src/Patch.php
index 98e5378..75c7983 100644
--- a/src/Patch.php
+++ b/src/Patch.php
@@ -27,14 +27,14 @@ class Patch
      * @param string $tableName The table in which documents should be patched
      * @param array|Field[] $fields The field comparison to match
      * @param array|object $patch The object with which the documents should be patched (will be JSON-encoded)
-     * @param string $conjunction How to handle multiple conditions (optional; defaults to `AND`)
+     * @param FieldMatch|null $match How to handle multiple conditions (optional; defaults to All)
      * @throws DocumentException If any is encountered
      */
     public static function byFields(string $tableName, array $fields, array|object $patch,
-                                    string $conjunction = 'AND'): void
+                                    ?FieldMatch $match = null): void
     {
         $namedFields = Parameters::nameFields($fields);
-        Custom::nonQuery(Query\Patch::byFields($tableName, $namedFields, $conjunction),
+        Custom::nonQuery(Query\Patch::byFields($tableName, $namedFields, $match),
             Parameters::addFields($namedFields, Parameters::json(':data', $patch)));
     }
 }
diff --git a/src/Query.php b/src/Query.php
index 495315a..66f10c1 100644
--- a/src/Query.php
+++ b/src/Query.php
@@ -2,6 +2,8 @@
 
 namespace BitBadger\PDODocument;
 
+use Random\RandomException;
+
 /**
  * Query construction functions
  */
@@ -22,12 +24,14 @@ class Query
      * 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)
+     * @param FieldMatch|null $match How to join multiple conditions (optional; defaults to All)
      * @return string The WHERE clause fragment matching the given fields and parameter
+     * @throws DocumentException If the database mode has not been set
      */
-    public static function whereByFields(array $fields, string $conjunction = 'AND'): string
+    public static function whereByFields(array $fields, ?FieldMatch $match = null): string
     {
-        return implode(" $conjunction ", array_map(fn($it) => $it->toWhere(), $fields));
+        return implode(' ' . ($match ?? FieldMatch::All)->toString() . ' ',
+            array_map(fn($it) => $it->toWhere(), $fields));
     }
 
     /**
@@ -35,6 +39,7 @@ class 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
+     * @throws DocumentException If the database mode has not been set
      */
     public static function whereById(string $paramName = ':id'): string
     {
@@ -42,14 +47,39 @@ class Query
     }
 
     /**
-     * Query to insert a document
+     * Create an `INSERT` statement for 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
+     * @param string $tableName The name of the table into which the document will be inserted
+     * @param AutoId|null $autoId The version of automatic ID query to generate (optional, defaults to None)
+     * @return string The `INSERT` statement to insert a document
+     * @throws DocumentException If the database mode is not set
      */
-    public static function insert(string $tableName): string
+    public static function insert(string $tableName, ?AutoId $autoId = null): string
     {
-        return "INSERT INTO $tableName VALUES (:data)";
+        try {
+            $id = Configuration::$idField;
+            $values = match (Configuration::$mode) {
+                Mode::SQLite => match ($autoId ?? AutoId::None) {
+                    AutoId::None         => ':data',
+                    AutoId::Number       => "json_set(:data, '$.$id', "
+                                                . "(SELECT coalesce(max(data->>'$id'), 0) + 1 FROM $tableName))",
+                    AutoId::UUID         => "json_set(:data, '$.$id', '" . AutoId::generateUUID() . "')",
+                    AutoId::RandomString => "json_set(:data, '$.$id', '" . AutoId::generateRandom() ."')"
+                },
+                Mode::PgSQL => match ($autoId ?? AutoId::None) {
+                    AutoId::None         => ':data',
+                    AutoId::Number       => ":data || ('{\"$id\":' || "
+                                                . "(SELECT COALESCE(MAX(data->>'$id'), 0) + 1 FROM $tableName) || '}')",
+                    AutoId::UUID         => ":data || '{\"$id\":\"" . AutoId::generateUUID() . "\"}'",
+                    AutoId::RandomString => ":data || '{\"$id\":\"" . AutoId::generateRandom() . "\"}'",
+                },
+                default =>
+                    throw new DocumentException('Database mode not set; cannot generate auto-ID INSERT statement'),
+            };
+            return "INSERT INTO $tableName VALUES ($values)";
+        } catch (RandomException $ex) {
+            throw new DocumentException('Unable to generate ID: ' . $ex->getMessage(), previous: $ex);
+        }
     }
 
     /**
@@ -60,8 +90,8 @@ class Query
      */
     public static function save(string $tableName): string
     {
-        return self::insert($tableName)
-            . " ON CONFLICT ((data->>'" . Configuration::$idField . "')) DO UPDATE SET data = EXCLUDED.data";
+        $id = Configuration::$idField;
+        return "INSERT INTO $tableName VALUES (:data) ON CONFLICT ((data->>'$id')) DO UPDATE SET data = EXCLUDED.data";
     }
 
     /**
@@ -69,6 +99,7 @@ class Query
      *
      * @param string $tableName The name of the table in which the document should be updated
      * @return string The UPDATE query for the document
+     * @throws DocumentException If the database mode has not been set
      */
     public static function update(string $tableName): string
     {
diff --git a/src/Query/Count.php b/src/Query/Count.php
index 87c47e3..8727e96 100644
--- a/src/Query/Count.php
+++ b/src/Query/Count.php
@@ -2,7 +2,7 @@
 
 namespace BitBadger\PDODocument\Query;
 
-use BitBadger\PDODocument\{Field, Query};
+use BitBadger\PDODocument\{DocumentException, Field, FieldMatch, Query};
 
 /**
  * Queries for counting documents
@@ -25,11 +25,12 @@ class Count
      *
      * @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`)
+     * @param FieldMatch|null $match How to join multiple conditions (optional; defaults to All)
      * @return string The query to count documents using a field comparison
+     * @throws DocumentException If the database mode has not been set
      */
-    public static function byFields(string $tableName, array $fields, string $conjunction = 'AND'): string
+    public static function byFields(string $tableName, array $fields, ?FieldMatch $match = null): string
     {
-        return self::all($tableName) . ' WHERE ' . Query::whereByFields($fields, $conjunction);
+        return self::all($tableName) . ' WHERE ' . Query::whereByFields($fields, $match);
     }
 }
diff --git a/src/Query/Delete.php b/src/Query/Delete.php
index 84bd2a0..a8303ab 100644
--- a/src/Query/Delete.php
+++ b/src/Query/Delete.php
@@ -2,7 +2,7 @@
 
 namespace BitBadger\PDODocument\Query;
 
-use BitBadger\PDODocument\{Field, Query};
+use BitBadger\PDODocument\{DocumentException, Field, FieldMatch, Query};
 
 /**
  * Queries to delete documents
@@ -14,6 +14,7 @@ class Delete
      *
      * @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
+     * @throws DocumentException If the database mode has not been set
      */
     public static function byId(string $tableName): string
     {
@@ -25,11 +26,12 @@ class Delete
      *
      * @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`)
+     * @param FieldMatch|null $match How to handle multiple conditions (optional; defaults to All)
      * @return string The DELETE statement to delete documents via field comparison
+     * @throws DocumentException If the database mode has not been set
      */
-    public static function byFields(string $tableName, array $fields, string $conjunction = 'AND'): string
+    public static function byFields(string $tableName, array $fields, ?FieldMatch $match = null): string
     {
-        return "DELETE FROM $tableName WHERE " . Query::whereByFields($fields, $conjunction);
+        return "DELETE FROM $tableName WHERE " . Query::whereByFields($fields, $match);
     }
 }
diff --git a/src/Query/Exists.php b/src/Query/Exists.php
index a7750b1..6ff86f4 100644
--- a/src/Query/Exists.php
+++ b/src/Query/Exists.php
@@ -2,7 +2,7 @@
 
 namespace BitBadger\PDODocument\Query;
 
-use BitBadger\PDODocument\{Field, Query};
+use BitBadger\PDODocument\{DocumentException, Field, FieldMatch, Query};
 
 /**
  * Queries to determine document existence
@@ -26,6 +26,7 @@ class Exists
      *
      * @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
+     * @throws DocumentException If the database mode has not been set
      */
     public static function byId(string $tableName): string
     {
@@ -37,11 +38,12 @@ class Exists
      *
      * @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`)
+     * @param FieldMatch|null $match How to handle multiple conditions (optional; defaults to All)
      * @return string The query to determine document existence by field comparison
+     * @throws DocumentException If the database mode has not been set
      */
-    public static function byFields(string $tableName, array $fields, string $conjunction = 'AND'): string
+    public static function byFields(string $tableName, array $fields, ?FieldMatch $match = null): string
     {
-        return self::query($tableName, Query::whereByFields($fields, $conjunction));
+        return self::query($tableName, Query::whereByFields($fields, $match));
     }
 }
diff --git a/src/Query/Find.php b/src/Query/Find.php
index 2e65385..824e8f3 100644
--- a/src/Query/Find.php
+++ b/src/Query/Find.php
@@ -2,7 +2,7 @@
 
 namespace BitBadger\PDODocument\Query;
 
-use BitBadger\PDODocument\{Field, Query};
+use BitBadger\PDODocument\{DocumentException, Field, FieldMatch, Query};
 
 /**
  * Queries for retrieving documents
@@ -14,6 +14,7 @@ class Find
      *
      * @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
+     * @throws DocumentException If the database mode has not been set
      */
     public static function byId(string $tableName): string
     {
@@ -25,11 +26,12 @@ class Find
      *
      * @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`)
+     * @param FieldMatch|null $match How to handle multiple conditions (optional; defaults to All)
      * @return string The SELECT statement to retrieve documents by field comparison
+     * @throws DocumentException If the database mode has not been set
      */
-    public static function byFields(string $tableName, array $fields, string $conjunction = 'AND'): string
+    public static function byFields(string $tableName, array $fields, ?FieldMatch $match = null): string
     {
-        return Query::selectFromTable($tableName) . ' WHERE ' . Query::whereByFields($fields, $conjunction);
+        return Query::selectFromTable($tableName) . ' WHERE ' . Query::whereByFields($fields, $match);
     }
 }
diff --git a/src/Query/Patch.php b/src/Query/Patch.php
index 6b1ab76..50a696b 100644
--- a/src/Query/Patch.php
+++ b/src/Query/Patch.php
@@ -2,7 +2,7 @@
 
 namespace BitBadger\PDODocument\Query;
 
-use BitBadger\PDODocument\{Configuration, DocumentException, Field, Mode, Query};
+use BitBadger\PDODocument\{Configuration, DocumentException, Field, FieldMatch, Mode, Query};
 
 /**
  * Queries to perform partial updates on documents
@@ -44,12 +44,12 @@ class Patch
      *
      * @param string $tableName The name of the table in which documents should be patched
      * @param array|Field[] $field The field comparison to match
-     * @param string $conjunction How to handle multiple conditions (optional; defaults to `AND`)
+     * @param FieldMatch|null $match How to handle multiple conditions (optional; defaults to All)
      * @return string The query to patch documents via field comparison
      * @throws DocumentException If the database mode has not been set
      */
-    public static function byFields(string $tableName, array $field, string $conjunction = 'AND'): string
+    public static function byFields(string $tableName, array $field, ?FieldMatch $match = null): string
     {
-        return self::update($tableName, Query::whereByFields($field, $conjunction));
+        return self::update($tableName, Query::whereByFields($field, $match));
     }
 }
diff --git a/src/Query/RemoveFields.php b/src/Query/RemoveFields.php
index 0e3fea0..c668abf 100644
--- a/src/Query/RemoveFields.php
+++ b/src/Query/RemoveFields.php
@@ -2,7 +2,7 @@
 
 namespace BitBadger\PDODocument\Query;
 
-use BitBadger\PDODocument\{Configuration, DocumentException, Field, Mode, Query};
+use BitBadger\PDODocument\{Configuration, DocumentException, Field, FieldMatch, Mode, Query};
 
 /**
  * Queries to remove fields from documents
@@ -54,13 +54,13 @@ class RemoveFields
      * @param string $tableName The name of the table in which documents should be manipulated
      * @param array|Field[] $fields The field comparison to match
      * @param array $parameters The parameter list for the query
-     * @param string $conjunction How to handle multiple conditions (optional; defaults to `AND`)
+     * @param FieldMatch|null $match How to handle multiple conditions (optional; defaults to All)
      * @return string The UPDATE statement to remove fields from documents via field comparison
      * @throws DocumentException If the database mode has not been set
      */
     public static function byFields(string $tableName, array $fields, array $parameters,
-                                    string $conjunction = 'AND'): string
+                                    ?FieldMatch $match = null): string
     {
-        return self::update($tableName, $parameters, Query::whereByFields($fields, $conjunction));
+        return self::update($tableName, $parameters, Query::whereByFields($fields, $match));
     }
 }
diff --git a/src/RemoveFields.php b/src/RemoveFields.php
index b32e2f4..3933e7d 100644
--- a/src/RemoveFields.php
+++ b/src/RemoveFields.php
@@ -28,15 +28,15 @@ class RemoveFields
      * @param string $tableName The table in which documents should have fields removed
      * @param array|Field[] $fields The field comparison to match
      * @param array|string[] $fieldNames The names of the fields to be removed
-     * @param string $conjunction How to handle multiple conditions (optional; defaults to `AND`)
+     * @param FieldMatch|null $match How to handle multiple conditions (optional; defaults to All)
      * @throws DocumentException If any is encountered
      */
     public static function byFields(string $tableName, array $fields, array $fieldNames,
-                                    string $conjunction = 'AND'): void
+                                    ?FieldMatch $match = null): void
     {
         $nameParams  = Parameters::fieldNames(':name', $fieldNames);
         $namedFields = Parameters::nameFields($fields);
-        Custom::nonQuery(Query\RemoveFields::byFields($tableName, $namedFields, $nameParams, $conjunction),
+        Custom::nonQuery(Query\RemoveFields::byFields($tableName, $namedFields, $nameParams, $match),
             Parameters::addFields($namedFields, $nameParams));
     }
 }
diff --git a/tests/integration/NumDocument.php b/tests/integration/NumDocument.php
new file mode 100644
index 0000000..664f3bb
--- /dev/null
+++ b/tests/integration/NumDocument.php
@@ -0,0 +1,11 @@
+<?php declare(strict_types=1);
+
+namespace Test\Integration;
+
+/**
+ * A test document with a numeric ID
+ */
+class NumDocument
+{
+    public function __construct(public int $id = 0, public string $value = '') { }
+}
diff --git a/tests/integration/sqlite/DocumentTest.php b/tests/integration/sqlite/DocumentTest.php
index 2616633..d3aed8b 100644
--- a/tests/integration/sqlite/DocumentTest.php
+++ b/tests/integration/sqlite/DocumentTest.php
@@ -2,10 +2,11 @@
 
 namespace Test\Integration\SQLite;
 
-use BitBadger\PDODocument\{Document, DocumentException, Find};
+use BitBadger\PDODocument\{AutoId, Configuration, Custom, Document, DocumentException, Field, Find};
+use BitBadger\PDODocument\Mapper\ArrayMapper;
 use PHPUnit\Framework\Attributes\TestDox;
 use PHPUnit\Framework\TestCase;
-use Test\Integration\{SubDocument, TestDocument};
+use Test\Integration\{NumDocument, SubDocument, TestDocument};
 
 /**
  * SQLite integration tests for the Document class
@@ -28,7 +29,125 @@ class DocumentTest extends TestCase
         parent::tearDown();
     }
 
-    public function testInsertSucceeds(): void
+    #[TestDox('Insert succeeds for array no auto ID')]
+    public function testInsertSucceedsForArrayNoAutoId(): void
+    {
+        Document::insert(ThrowawayDb::TABLE, ['id' => 'turkey', 'sub' => ['foo' => 'gobble', 'bar' => 'gobble']]);
+        $doc = Find::byId(ThrowawayDb::TABLE, 'turkey', TestDocument::class);
+        $this->assertNotFalse($doc, 'There should have been a document inserted');
+        $this->assertEquals('turkey', $doc->id, 'The ID was incorrect');
+        $this->assertEquals('', $doc->value, 'The value was incorrect');
+        $this->assertEquals(0, $doc->num_value, 'The numeric value was incorrect');
+        $this->assertNotNull($doc->sub, 'The sub-document should not have been null');
+        $this->assertEquals('gobble', $doc->sub->foo, 'The sub-document foo property was incorrect');
+        $this->assertEquals('gobble', $doc->sub->bar, 'The sub-document bar property was incorrect');
+    }
+
+    #[TestDox('Insert succeeds for array with auto number ID not provided')]
+    public function testInsertSucceedsForArrayWithAutoNumberIdNotProvided(): void
+    {
+        Configuration::$autoId = AutoId::Number;
+        try {
+            Custom::nonQuery('DELETE FROM ' . ThrowawayDb::TABLE, []);
+
+            Document::insert(ThrowawayDb::TABLE, ['id' => 0, 'value' => 'new', 'num_value' => 8]);
+            $doc = Custom::single('SELECT data FROM ' . ThrowawayDb::TABLE, [], new ArrayMapper());
+            $this->assertNotFalse($doc, 'There should have been a document returned');
+            $obj = json_decode($doc['data']);
+            $this->assertEquals(1, $obj->id, 'The ID 1 should have been auto-generated');
+
+            Document::insert(ThrowawayDb::TABLE, ['id' => 0, 'value' => 'again', 'num_value' => 7]);
+            $doc = Custom::single('SELECT data FROM ' . ThrowawayDb::TABLE . " WHERE data->>'id' = 2", [],
+                new ArrayMapper());
+            $this->assertNotFalse($doc, 'There should have been a document returned');
+            $obj = json_decode($doc['data']);
+            $this->assertEquals(2, $obj->id, 'The ID 2 should have been auto-generated');
+        } finally {
+            Configuration::$autoId = AutoId::None;
+        }
+    }
+
+    #[TestDox('Insert succeeds for array with auto number ID with ID provided')]
+    public function testInsertSucceedsForArrayWithAutoNumberIdWithIdProvided(): void
+    {
+        Configuration::$autoId = AutoId::Number;
+        try {
+            Custom::nonQuery('DELETE FROM ' . ThrowawayDb::TABLE, []);
+            Document::insert(ThrowawayDb::TABLE, ['id' => 7, 'value' => 'new', 'num_value' => 8]);
+            $doc = Custom::single('SELECT data FROM ' . ThrowawayDb::TABLE, [], new ArrayMapper());
+            $this->assertNotFalse($doc, 'There should have been a document returned');
+            $obj = json_decode($doc['data']);
+            $this->assertEquals(7, $obj->id, 'The ID 7 should have been stored');
+        } finally {
+            Configuration::$autoId = AutoId::None;
+        }
+    }
+
+    #[TestDox('Insert succeeds for array with auto UUID ID not provided')]
+    public function testInsertSucceedsForArrayWithAutoUuidIdNotProvided(): void
+    {
+        Configuration::$autoId = AutoId::UUID;
+        try {
+            Custom::nonQuery('DELETE FROM ' . ThrowawayDb::TABLE, []);
+            Document::insert(ThrowawayDb::TABLE, ['id' => '', 'num_value' => 5]);
+            $doc = Find::firstByFields(ThrowawayDb::TABLE, [Field::EQ('num_value', 5)], TestDocument::class);
+            $this->assertNotFalse($doc, 'There should have been a document returned');
+            $this->assertNotEmpty($doc->id, 'The ID should have been auto-generated');
+        } finally {
+            Configuration::$autoId = AutoId::None;
+        }
+    }
+
+    #[TestDox('Insert succeeds for array with auto UUID ID with ID provided')]
+    public function testInsertSucceedsForArrayWithAutoUuidIdWithIdProvided(): void
+    {
+        Configuration::$autoId = AutoId::UUID;
+        try {
+            Custom::nonQuery('DELETE FROM ' . ThrowawayDb::TABLE, []);
+            $uuid = AutoId::generateUUID();
+            Document::insert(ThrowawayDb::TABLE, ['id' => $uuid, 'value' => 'uuid', 'num_value' => 12]);
+            $doc = Find::firstByFields(ThrowawayDb::TABLE, [Field::EQ('num_value', 12)], TestDocument::class);
+            $this->assertNotFalse($doc, 'There should have been a document returned');
+            $this->assertEquals($uuid, $doc->id, 'The ID should not have been changed');
+        } finally {
+            Configuration::$autoId = AutoId::None;
+        }
+    }
+
+    #[TestDox('Insert succeeds for array with auto string ID not provided')]
+    public function testInsertSucceedsForArrayWithAutoStringIdNotProvided(): void
+    {
+        Configuration::$autoId         = AutoId::RandomString;
+        Configuration::$idStringLength = 6;
+        try {
+            Custom::nonQuery('DELETE FROM ' . ThrowawayDb::TABLE, []);
+            Document::insert(ThrowawayDb::TABLE, ['id' => '', 'value' => 'new', 'num_value' => 8]);
+            $doc = Find::firstByFields(ThrowawayDb::TABLE, [Field::EQ('num_value', 8)], TestDocument::class);
+            $this->assertNotFalse($doc, 'There should have been a document returned');
+            $this->assertEquals(6, strlen($doc->id), 'The ID should have been auto-generated and had 6 characters');
+        } finally {
+            Configuration::$autoId         = AutoId::None;
+            Configuration::$idStringLength = 16;
+        }
+    }
+
+    #[TestDox('Insert succeeds for array with auto string ID with ID provided')]
+    public function testInsertSucceedsForArrayWithAutoStringIdWithIdProvided(): void
+    {
+        Configuration::$autoId = AutoId::RandomString;
+        try {
+            Custom::nonQuery('DELETE FROM ' . ThrowawayDb::TABLE, []);
+            Document::insert(ThrowawayDb::TABLE, ['id' => 'my-key', 'value' => 'old', 'num_value' => 3]);
+            $doc = Find::firstByFields(ThrowawayDb::TABLE, [Field::EQ('num_value', 3)], TestDocument::class);
+            $this->assertNotFalse($doc, 'There should have been a document returned');
+            $this->assertEquals('my-key', $doc->id, 'The ID should not have been changed');
+        } finally {
+            Configuration::$autoId = AutoId::None;
+        }
+    }
+
+    #[TestDox('Insert succeeds for object no auto ID')]
+    public function testInsertSucceedsForObjectNoAutoId(): void
     {
         Document::insert(ThrowawayDb::TABLE, new TestDocument('turkey', sub: new SubDocument('gobble', 'gobble')));
         $doc = Find::byId(ThrowawayDb::TABLE, 'turkey', TestDocument::class);
@@ -41,6 +160,105 @@ class DocumentTest extends TestCase
         $this->assertEquals('gobble', $doc->sub->bar, 'The sub-document bar property was incorrect');
     }
 
+    #[TestDox('Insert succeeds for object with auto number ID not provided')]
+    public function testInsertSucceedsForObjectWithAutoNumberIdNotProvided(): void
+    {
+        Configuration::$autoId = AutoId::Number;
+        try {
+            Custom::nonQuery('DELETE FROM ' . ThrowawayDb::TABLE, []);
+
+            Document::insert(ThrowawayDb::TABLE, new NumDocument(value: 'taco'));
+            $doc = Find::firstByFields(ThrowawayDb::TABLE, [Field::EQ('value', 'taco')], NumDocument::class);
+            $this->assertNotFalse($doc, 'There should have been a document returned');
+            $this->assertEquals(1, $doc->id, 'The ID 1 should have been auto-generated');
+
+            Document::insert(ThrowawayDb::TABLE, new NumDocument(value: 'burrito'));
+            $doc = Find::firstByFields(ThrowawayDb::TABLE, [Field::EQ('value', 'burrito')], NumDocument::class);
+            $this->assertNotFalse($doc, 'There should have been a document returned');
+            $this->assertEquals(2, $doc->id, 'The ID 2 should have been auto-generated');
+        } finally {
+            Configuration::$autoId = AutoId::None;
+        }
+    }
+
+    #[TestDox('Insert succeeds for object with auto number ID with ID provided')]
+    public function testInsertSucceedsForObjectWithAutoNumberIdWithIdProvided(): void
+    {
+        Configuration::$autoId = AutoId::Number;
+        try {
+            Custom::nonQuery('DELETE FROM ' . ThrowawayDb::TABLE, []);
+            Document::insert(ThrowawayDb::TABLE, new NumDocument(64, 'large'));
+            $doc = Find::firstByFields(ThrowawayDb::TABLE, [Field::EQ('value', 'large')], NumDocument::class);
+            $this->assertNotFalse($doc, 'There should have been a document returned');
+            $this->assertEquals(64, $doc->id, 'The ID 64 should have been stored');
+        } finally {
+            Configuration::$autoId = AutoId::None;
+        }
+    }
+
+    #[TestDox('Insert succeeds for object with auto UUID ID not provided')]
+    public function testInsertSucceedsForObjectWithAutoUuidIdNotProvided(): void
+    {
+        Configuration::$autoId = AutoId::UUID;
+        try {
+            Custom::nonQuery('DELETE FROM ' . ThrowawayDb::TABLE, []);
+            Document::insert(ThrowawayDb::TABLE, new TestDocument(value: 'something', num_value: 9));
+            $doc = Find::firstByFields(ThrowawayDb::TABLE, [Field::EX('value')], TestDocument::class);
+            $this->assertNotFalse($doc, 'There should have been a document returned');
+            $this->assertNotEmpty($doc->id, 'The ID should have been auto-generated');
+        } finally {
+            Configuration::$autoId = AutoId::None;
+        }
+    }
+
+    #[TestDox('Insert succeeds for object with auto UUID ID with ID provided')]
+    public function testInsertSucceedsForObjectWithAutoUuidIdWithIdProvided(): void
+    {
+        Configuration::$autoId = AutoId::UUID;
+        try {
+            Custom::nonQuery('DELETE FROM ' . ThrowawayDb::TABLE, []);
+            $uuid = AutoId::generateUUID();
+            Document::insert(ThrowawayDb::TABLE, new TestDocument($uuid, num_value: 14));
+            $doc = Find::firstByFields(ThrowawayDb::TABLE, [Field::EQ('num_value', 14)], TestDocument::class);
+            $this->assertNotFalse($doc, 'There should have been a document returned');
+            $this->assertEquals($uuid, $doc->id, 'The ID should not have been changed');
+        } finally {
+            Configuration::$autoId = AutoId::None;
+        }
+    }
+
+    #[TestDox('Insert succeeds for object with auto string ID not provided')]
+    public function testInsertSucceedsForObjectWithAutoStringIdNotProvided(): void
+    {
+        Configuration::$autoId         = AutoId::RandomString;
+        Configuration::$idStringLength = 40;
+        try {
+            Custom::nonQuery('DELETE FROM ' . ThrowawayDb::TABLE, []);
+            Document::insert(ThrowawayDb::TABLE, new TestDocument(num_value: 55));
+            $doc = Find::firstByFields(ThrowawayDb::TABLE, [Field::EQ('num_value', 55)], TestDocument::class);
+            $this->assertNotFalse($doc, 'There should have been a document returned');
+            $this->assertEquals(40, strlen($doc->id), 'The ID should have been auto-generated and had 40 characters');
+        } finally {
+            Configuration::$autoId         = AutoId::None;
+            Configuration::$idStringLength = 16;
+        }
+    }
+
+    #[TestDox('Insert succeeds for object with auto string ID with ID provided')]
+    public function testInsertSucceedsForObjectWithAutoStringIdWithIdProvided(): void
+    {
+        Configuration::$autoId = AutoId::RandomString;
+        try {
+            Custom::nonQuery('DELETE FROM ' . ThrowawayDb::TABLE, []);
+            Document::insert(ThrowawayDb::TABLE, new TestDocument('my-key', num_value: 3));
+            $doc = Find::firstByFields(ThrowawayDb::TABLE, [Field::EQ('num_value', 3)], TestDocument::class);
+            $this->assertNotFalse($doc, 'There should have been a document returned');
+            $this->assertEquals('my-key', $doc->id, 'The ID should not have been changed');
+        } finally {
+            Configuration::$autoId = AutoId::None;
+        }
+    }
+
     public function testInsertFailsForDuplicateKey(): void
     {
         $this->expectException(DocumentException::class);
diff --git a/tests/unit/ConfigurationTest.php b/tests/unit/ConfigurationTest.php
index 1416ceb..50dd909 100644
--- a/tests/unit/ConfigurationTest.php
+++ b/tests/unit/ConfigurationTest.php
@@ -2,7 +2,7 @@
 
 namespace Test\Unit;
 
-use BitBadger\PDODocument\{Configuration, DocumentException};
+use BitBadger\PDODocument\{AutoId, Configuration, DocumentException};
 use PHPUnit\Framework\Attributes\TestDox;
 use PHPUnit\Framework\TestCase;
 
@@ -29,6 +29,18 @@ class ConfigurationTest extends TestCase
         }
     }
 
+    #[TestDox('Auto ID default succeeds')]
+    public function testAutoIdDefaultSucceeds(): void
+    {
+        $this->assertEquals(AutoId::None, Configuration::$autoId, 'Auto ID should default to None');
+    }
+
+    #[TestDox('ID string length default succeeds')]
+    public function testIdStringLengthDefaultSucceeds(): void
+    {
+        $this->assertEquals(16, Configuration::$idStringLength, 'ID string length should default to 16');
+    }
+
     #[TestDox("Db conn fails when no DSN specified")]
     public function testDbConnFailsWhenNoDSNSpecified(): void
     {
diff --git a/tests/unit/FieldMatchTest.php b/tests/unit/FieldMatchTest.php
new file mode 100644
index 0000000..9fd8942
--- /dev/null
+++ b/tests/unit/FieldMatchTest.php
@@ -0,0 +1,22 @@
+<?php declare(strict_types=1);
+
+namespace Test\Unit;
+
+use BitBadger\PDODocument\FieldMatch;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Unit tests for the FieldMatch enum
+ */
+class FieldMatchTest extends TestCase
+{
+    public function testToStringSucceedsForAll(): void
+    {
+        $this->assertEquals('AND', FieldMatch::All->toString(), 'All should have returned AND');
+    }
+
+    public function testToStringSucceedsForAny(): void
+    {
+        $this->assertEquals('OR', FieldMatch::Any->toString(), 'Any should have returned OR');
+    }
+}
diff --git a/tests/unit/Query/FindTest.php b/tests/unit/Query/FindTest.php
index 5b2fb9a..10e7d73 100644
--- a/tests/unit/Query/FindTest.php
+++ b/tests/unit/Query/FindTest.php
@@ -2,7 +2,7 @@
 
 namespace Test\Unit\Query;
 
-use BitBadger\PDODocument\{Configuration, Field, Mode};
+use BitBadger\PDODocument\{Configuration, Field, FieldMatch, Mode};
 use BitBadger\PDODocument\Query\Find;
 use PHPUnit\Framework\Attributes\TestDox;
 use PHPUnit\Framework\TestCase;
@@ -32,7 +32,8 @@ class FindTest extends TestCase
     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'),
+            Find::byFields('there', [Field::EQ('active', true, ':act'), Field::EQ('locked', true, ':lock')],
+                FieldMatch::Any),
             'SELECT query not generated correctly');
     }
 }
diff --git a/tests/unit/QueryTest.php b/tests/unit/QueryTest.php
index b3ac80b..a816157 100644
--- a/tests/unit/QueryTest.php
+++ b/tests/unit/QueryTest.php
@@ -2,7 +2,7 @@
 
 namespace Test\Unit;
 
-use BitBadger\PDODocument\{Configuration, Field, Mode, Query};
+use BitBadger\PDODocument\{AutoId, Configuration, DocumentException, Field, FieldMatch, Mode, Query};
 use PHPUnit\Framework\Attributes\TestDox;
 use PHPUnit\Framework\TestCase;
 
@@ -33,17 +33,18 @@ class QueryTest extends TestCase
             Query::whereByFields([Field::LE('test_field', '', ':it')]), 'WHERE fragment not constructed correctly');
     }
 
-    public function testWhereByFieldsSucceedsForMultipleFields(): void
+    public function testWhereByFieldsSucceedsForMultipleFieldsAll(): 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
+    public function testWhereByFieldsSucceedsForMultipleFieldsAny(): 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'),
+            Query::whereByFields([Field::LE('test_field', '', ':it'), Field::EQ('other_field', '', ':other')],
+                FieldMatch::Any),
             'WHERE fragment not constructed correctly');
     }
 
@@ -59,10 +60,125 @@ class QueryTest extends TestCase
         $this->assertEquals("data->>'id' = :di", Query::whereById(':di'), 'WHERE fragment not constructed correctly');
     }
 
-    public function testInsertSucceeds(): void
+    #[TestDox('Insert succeeds with no auto-ID for PostgreSQL')]
+    public function testInsertSucceedsWithNoAutoIdForPostgreSQL(): void
     {
-        $this->assertEquals('INSERT INTO my_table VALUES (:data)', Query::insert('my_table'),
-            'INSERT statement not constructed correctly');
+        Configuration::$mode = Mode::PgSQL;
+        try {
+            $this->assertEquals('INSERT INTO test_tbl VALUES (:data)', Query::insert('test_tbl'),
+                'INSERT statement not constructed correctly');
+        } finally {
+            Configuration::$mode = null;
+        }
+    }
+
+    #[TestDox('Insert succeeds with no auto-ID for SQLite')]
+    public function testInsertSucceedsWithNoAutoIdForSQLite(): void
+    {
+        Configuration::$mode = Mode::SQLite;
+        try {
+            $this->assertEquals('INSERT INTO test_tbl VALUES (:data)', Query::insert('test_tbl'),
+                'INSERT statement not constructed correctly');
+        } finally {
+            Configuration::$mode = null;
+        }
+    }
+
+    #[TestDox('Insert succeeds with auto numeric ID for PostgreSQL')]
+    public function testInsertSucceedsWithAutoNumericIdForPostgreSQL(): void
+    {
+        Configuration::$mode = Mode::PgSQL;
+        try {
+            $this->assertEquals(
+                "INSERT INTO test_tbl VALUES (:data || ('{\"id\":' "
+                    . "|| (SELECT COALESCE(MAX(data->>'id'), 0) + 1 FROM test_tbl) || '}'))",
+                Query::insert('test_tbl', AutoId::Number), 'INSERT statement not constructed correctly');
+        } finally {
+            Configuration::$mode = null;
+        }
+    }
+
+    #[TestDox('Insert succeeds with auto numeric ID for SQLite')]
+    public function testInsertSucceedsWithAutoNumericIdForSQLite(): void
+    {
+        Configuration::$mode = Mode::SQLite;
+        try {
+            $this->assertEquals(
+                "INSERT INTO test_tbl VALUES (json_set(:data, '$.id', "
+                    . "(SELECT coalesce(max(data->>'id'), 0) + 1 FROM test_tbl)))",
+                Query::insert('test_tbl', AutoId::Number), 'INSERT statement not constructed correctly');
+        } finally {
+            Configuration::$mode = null;
+        }
+    }
+
+    #[TestDox('Insert succeeds with auto UUID for PostgreSQL')]
+    public function testInsertSucceedsWithAutoUuidForPostgreSQL(): void
+    {
+        Configuration::$mode = Mode::PgSQL;
+        try {
+            $query = Query::insert('test_tbl', AutoId::UUID);
+            $this->assertStringStartsWith("INSERT INTO test_tbl VALUES (:data || '{\"id\":\"", $query,
+                'INSERT statement not constructed correctly');
+            $this->assertStringEndsWith("\"}')", $query, 'INSERT statement not constructed correctly');
+        } finally {
+            Configuration::$mode = null;
+        }
+    }
+
+    #[TestDox('Insert succeeds with auto UUID for SQLite')]
+    public function testInsertSucceedsWithAutoUuidForSQLite(): void
+    {
+        Configuration::$mode = Mode::SQLite;
+        try {
+            $query = Query::insert('test_tbl', AutoId::UUID);
+            $this->assertStringStartsWith("INSERT INTO test_tbl VALUES (json_set(:data, '$.id', '", $query,
+                'INSERT statement not constructed correctly');
+            $this->assertStringEndsWith("'))", $query, 'INSERT statement not constructed correctly');
+        } finally {
+            Configuration::$mode = null;
+        }
+    }
+
+    #[TestDox('Insert succeeds with auto random string for PostgreSQL')]
+    public function testInsertSucceedsWithAutoRandomStringForPostgreSQL(): void
+    {
+        Configuration::$mode           = Mode::PgSQL;
+        Configuration::$idStringLength = 8;
+        try {
+            $query = Query::insert('test_tbl', AutoId::RandomString);
+            $this->assertStringStartsWith("INSERT INTO test_tbl VALUES (:data || '{\"id\":\"", $query,
+                'INSERT statement not constructed correctly');
+            $this->assertStringEndsWith("\"}')", $query, 'INSERT statement not constructed correctly');
+            $id = str_replace(["INSERT INTO test_tbl VALUES (:data || '{\"id\":\"", "\"}')"], '', $query);
+            $this->assertEquals(8, strlen($id), "Generated ID [$id] should have been 8 characters long");
+        } finally {
+            Configuration::$mode           = null;
+            Configuration::$idStringLength = 16;
+        }
+    }
+
+    #[TestDox('Insert succeeds with auto random string for SQLite')]
+    public function testInsertSucceedsWithAutoRandomStringForSQLite(): void
+    {
+        Configuration::$mode = Mode::SQLite;
+        try {
+            $query = Query::insert('test_tbl', AutoId::RandomString);
+            $this->assertStringStartsWith("INSERT INTO test_tbl VALUES (json_set(:data, '$.id', '", $query,
+                'INSERT statement not constructed correctly');
+            $this->assertStringEndsWith("'))", $query, 'INSERT statement not constructed correctly');
+            $id = str_replace(["INSERT INTO test_tbl VALUES (json_set(:data, '$.id', '", "'))"], '', $query);
+            $this->assertEquals(16, strlen($id), "Generated ID [$id] should have been 16 characters long");
+        } finally {
+            Configuration::$mode = null;
+        }
+    }
+
+    public function testInsertFailsWhenModeNotSet(): void
+    {
+        $this->expectException(DocumentException::class);
+        Configuration::$mode = null;
+        Query::insert('kaboom');
     }
 
     public function testSaveSucceeds(): void