src/integration-test/kotlin/ThrowawayDatabase.kt

@@ -0,0 +1,20 @@
+package solutions.bitbadger.documents
+
+import java.sql.Connection
+
+/**
+ * Common interface for PostgreSQL and SQLite throwaway databases
+ */
+interface ThrowawayDatabase : AutoCloseable {
+
+    /** The database connection for the throwaway database */
+    val conn: Connection
+
+    /**
+     * Determine if a database object exists
+     *
+     * @param name The name of the object whose existence should be checked
+     * @return True if the object exists, false if not
+     */
+    fun dbObjectExists(name: String): Boolean
+}

src/integration-test/kotlin/Types.kt

@@ -3,6 +3,9 @@ package solutions.bitbadger.documents
 import kotlinx.serialization.Serializable
 import java.sql.Connection
 
+/** The test table name to use for integration tests */
+const val TEST_TABLE = "test_table"
+
 @Serializable
 data class NumIdDocument(val key: Int, val text: String)
 
@@ -14,9 +17,9 @@ data class ArrayDocument(val id: String, val values: List<String>) {
     companion object {
         /** A set of documents used for integration tests */
         val testDocuments = listOf(
-            ArrayDocument("first", listOf("a", "b", "c" )),
+            ArrayDocument("first",  listOf("a", "b", "c")),
             ArrayDocument("second", listOf("c", "d", "e")),
-            ArrayDocument("third", listOf("x", "y", "z")))
+            ArrayDocument("third",  listOf("x", "y", "z")))
     }
 }
 
@@ -34,10 +37,7 @@ data class JsonDocument(val id: String, val value: String, val numValue: Int, va
             JsonDocument("four",  "purple",  17, SubDocument("green", "red")),
             JsonDocument("five",  "purple",  18, null))
 
-        fun load(conn: Connection, tableName: String = "test_table") =
+        fun load(db: ThrowawayDatabase, tableName: String = TEST_TABLE) =
-            testDocuments.forEach { conn.insert(tableName, it) }
+            testDocuments.forEach { db.conn.insert(tableName, it) }
     }
 }
-
-/** The test table name to use for integration tests */
-const val TEST_TABLE = "test_table"

src/integration-test/kotlin/common/Custom.kt

@@ -2,8 +2,8 @@ package solutions.bitbadger.documents.common
 
 import solutions.bitbadger.documents.*
 import solutions.bitbadger.documents.query.Count
+import solutions.bitbadger.documents.query.Delete
 import solutions.bitbadger.documents.query.Find
-import java.sql.Connection
 import kotlin.test.assertEquals
 import kotlin.test.assertNotNull
 import kotlin.test.assertNull
@@ -13,67 +13,67 @@ import kotlin.test.assertNull
  */
 object Custom {
 
-    fun listEmpty(conn: Connection) {
+    fun listEmpty(db: ThrowawayDatabase) {
-        JsonDocument.load(conn, TEST_TABLE)
+        JsonDocument.load(db)
-        conn.customNonQuery("DELETE FROM $TEST_TABLE")
+        db.conn.deleteByFields(TEST_TABLE, listOf(Field.exists(Configuration.idField)))
-        val result = conn.customList<JsonDocument>(Find.all(TEST_TABLE), mapFunc = Results::fromData)
+        val result = db.conn.customList<JsonDocument>(Find.all(TEST_TABLE), mapFunc = Results::fromData)
         assertEquals(0, result.size, "There should have been no results")
     }
 
-    fun listAll(conn: Connection) {
+    fun listAll(db: ThrowawayDatabase) {
-        JsonDocument.load(conn, TEST_TABLE)
+        JsonDocument.load(db)
-        val result = conn.customList<JsonDocument>(Find.all(TEST_TABLE), mapFunc = Results::fromData)
+        val result = db.conn.customList<JsonDocument>(Find.all(TEST_TABLE), mapFunc = Results::fromData)
         assertEquals(5, result.size, "There should have been 5 results")
     }
 
-    fun singleNone(conn: Connection) =
+    fun singleNone(db: ThrowawayDatabase) =
         assertNull(
-            conn.customSingle(Find.all(TEST_TABLE), mapFunc = Results::fromData),
+            db.conn.customSingle(Find.all(TEST_TABLE), mapFunc = Results::fromData),
             "There should not have been a document returned"
         )
 
-    fun singleOne(conn: Connection) {
+    fun singleOne(db: ThrowawayDatabase) {
-        JsonDocument.load(conn, TEST_TABLE)
+        JsonDocument.load(db)
         assertNotNull(
-            conn.customSingle<JsonDocument>(Find.all(TEST_TABLE), mapFunc = Results::fromData),
+            db.conn.customSingle<JsonDocument>(Find.all(TEST_TABLE), mapFunc = Results::fromData),
             "There should not have been a document returned"
         )
     }
 
-    fun nonQueryChanges(conn: Connection) {
+    fun nonQueryChanges(db: ThrowawayDatabase) {
-        JsonDocument.load(conn, TEST_TABLE)
+        JsonDocument.load(db)
         assertEquals(
-            5L, conn.customScalar(Count.all(TEST_TABLE), mapFunc = Results::toCount),
+            5L, db.conn.customScalar(Count.all(TEST_TABLE), mapFunc = Results::toCount),
             "There should have been 5 documents in the table"
         )
-        conn.customNonQuery("DELETE FROM $TEST_TABLE")
+        db.conn.customNonQuery("DELETE FROM $TEST_TABLE")
         assertEquals(
-            0L, conn.customScalar(Count.all(TEST_TABLE), mapFunc = Results::toCount),
+            0L, db.conn.customScalar(Count.all(TEST_TABLE), mapFunc = Results::toCount),
             "There should have been no documents in the table"
         )
     }
 
-    fun nonQueryNoChanges(conn: Connection) {
+    fun nonQueryNoChanges(db: ThrowawayDatabase) {
-        JsonDocument.load(conn, TEST_TABLE)
+        JsonDocument.load(db)
         assertEquals(
-            5L, conn.customScalar(Count.all(TEST_TABLE), mapFunc = Results::toCount),
+            5L, db.conn.customScalar(Count.all(TEST_TABLE), mapFunc = Results::toCount),
             "There should have been 5 documents in the table"
         )
-        conn.customNonQuery(
+        db.conn.customNonQuery(
-            "DELETE FROM $TEST_TABLE WHERE data->>'id' = :id",
+            Delete.byId(TEST_TABLE, "eighty-two"),
             listOf(Parameter(":id", ParameterType.STRING, "eighty-two"))
         )
         assertEquals(
-            5L, conn.customScalar(Count.all(TEST_TABLE), mapFunc = Results::toCount),
+            5L, db.conn.customScalar(Count.all(TEST_TABLE), mapFunc = Results::toCount),
             "There should still have been 5 documents in the table"
         )
     }
 
-    fun scalar(conn: Connection) {
+    fun scalar(db: ThrowawayDatabase) {
-        JsonDocument.load(conn, TEST_TABLE)
+        JsonDocument.load(db)
         assertEquals(
             3L,
-            conn.customScalar("SELECT 3 AS it FROM $TEST_TABLE LIMIT 1", mapFunc = Results::toCount),
+            db.conn.customScalar("SELECT 3 AS it FROM $TEST_TABLE LIMIT 1", mapFunc = Results::toCount),
             "The number 3 should have been returned"
         )
     }

src/integration-test/kotlin/common/Definition.kt

@@ -0,0 +1,28 @@
+package solutions.bitbadger.documents.common
+
+import solutions.bitbadger.documents.TEST_TABLE
+import solutions.bitbadger.documents.ThrowawayDatabase
+import solutions.bitbadger.documents.ensureFieldIndex
+import solutions.bitbadger.documents.ensureTable
+import kotlin.test.assertFalse
+import kotlin.test.assertTrue
+
+/**
+ * Integration tests for the `Definition` object / `ensure*` connection extension functions
+ */
+object Definition {
+
+    fun ensureTable(db: ThrowawayDatabase) {
+        assertFalse(db.dbObjectExists("ensured"), "The 'ensured' table should not exist")
+        assertFalse(db.dbObjectExists("idx_ensured_key"), "The PK index for the 'ensured' table should not exist")
+        db.conn.ensureTable("ensured")
+        assertTrue(db.dbObjectExists("ensured"), "The 'ensured' table should exist")
+        assertTrue(db.dbObjectExists("idx_ensured_key"), "The PK index for the 'ensured' table should now exist")
+    }
+
+    fun ensureFieldIndex(db: ThrowawayDatabase) {
+        assertFalse(db.dbObjectExists("idx_${TEST_TABLE}_test"), "The test index should not exist")
+        db.conn.ensureFieldIndex(TEST_TABLE, "test", listOf("id", "category"))
+        assertTrue(db.dbObjectExists("idx_${TEST_TABLE}_test"), "The test index should now exist")
+    }
+}

src/integration-test/kotlin/common/Document.kt

@@ -1,7 +1,6 @@
 package solutions.bitbadger.documents.common
 
 import solutions.bitbadger.documents.*
-import java.sql.Connection
 import kotlin.test.assertEquals
 import kotlin.test.fail
 
@@ -10,37 +9,37 @@ import kotlin.test.fail
  */
 object Document {
 
-    fun insertDefault(conn: Connection) {
+    fun insertDefault(db: ThrowawayDatabase) {
-        assertEquals(0L, conn.countAll(TEST_TABLE), "There should be no documents in the table")
+        assertEquals(0L, db.conn.countAll(TEST_TABLE), "There should be no documents in the table")
         val doc = JsonDocument("turkey", "", 0, SubDocument("gobble", "gobble"))
-        conn.insert(TEST_TABLE, doc)
+        db.conn.insert(TEST_TABLE, doc)
-        val after = conn.findAll<JsonDocument>(TEST_TABLE)
+        val after = db.conn.findAll<JsonDocument>(TEST_TABLE)
         assertEquals(1, after.size, "There should be one document in the table")
         assertEquals(doc, after[0], "The document should be what was inserted")
     }
 
-    fun insertDupe(conn: Connection) {
+    fun insertDupe(db: ThrowawayDatabase) {
-        conn.insert(TEST_TABLE, JsonDocument("a", "", 0, null))
+        db.conn.insert(TEST_TABLE, JsonDocument("a", "", 0, null))
         try {
-            conn.insert(TEST_TABLE, JsonDocument("a", "b", 22, null))
+            db.conn.insert(TEST_TABLE, JsonDocument("a", "b", 22, null))
             fail("Inserting a document with a duplicate key should have thrown an exception")
         } catch (_: Exception) {
             // yay
         }
     }
 
-    fun insertNumAutoId(conn: Connection) {
+    fun insertNumAutoId(db: ThrowawayDatabase) {
         try {
             Configuration.autoIdStrategy = AutoId.NUMBER
             Configuration.idField = "key"
-            assertEquals(0L, conn.countAll(TEST_TABLE), "There should be no documents in the table")
+            assertEquals(0L, db.conn.countAll(TEST_TABLE), "There should be no documents in the table")
 
-            conn.insert(TEST_TABLE, NumIdDocument(0, "one"))
+            db.conn.insert(TEST_TABLE, NumIdDocument(0, "one"))
-            conn.insert(TEST_TABLE, NumIdDocument(0, "two"))
+            db.conn.insert(TEST_TABLE, NumIdDocument(0, "two"))
-            conn.insert(TEST_TABLE, NumIdDocument(77, "three"))
+            db.conn.insert(TEST_TABLE, NumIdDocument(77, "three"))
-            conn.insert(TEST_TABLE, NumIdDocument(0, "four"))
+            db.conn.insert(TEST_TABLE, NumIdDocument(0, "four"))
 
-            val after = conn.findAll<NumIdDocument>(TEST_TABLE, listOf(Field.named("key")))
+            val after = db.conn.findAll<NumIdDocument>(TEST_TABLE, listOf(Field.named("key")))
             assertEquals(4, after.size, "There should have been 4 documents returned")
             assertEquals(
                 "1|2|77|78", after.joinToString("|") { it.key.toString() },
@@ -52,6 +51,38 @@ object Document {
         }
     }
 
-    // TODO: UUID, Random String
+    fun insertUUIDAutoId(db: ThrowawayDatabase) {
+        try {
+            Configuration.autoIdStrategy = AutoId.UUID
+            assertEquals(0L, db.conn.countAll(TEST_TABLE), "There should be no documents in the table")
 
+            db.conn.insert(TEST_TABLE, JsonDocument.emptyDoc)
+
+            val after = db.conn.findAll<JsonDocument>(TEST_TABLE)
+            assertEquals(1, after.size, "There should have been 1 document returned")
+            assertEquals(32, after[0].id.length, "The ID was not generated correctly")
+        } finally {
+            Configuration.autoIdStrategy = AutoId.DISABLED
+        }
+    }
+
+    fun insertStringAutoId(db: ThrowawayDatabase) {
+        try {
+            Configuration.autoIdStrategy = AutoId.RANDOM_STRING
+            assertEquals(0L, db.conn.countAll(TEST_TABLE), "There should be no documents in the table")
+
+            db.conn.insert(TEST_TABLE, JsonDocument.emptyDoc)
+
+            Configuration.idStringLength = 21
+            db.conn.insert(TEST_TABLE, JsonDocument.emptyDoc)
+
+            val after = db.conn.findAll<JsonDocument>(TEST_TABLE)
+            assertEquals(2, after.size, "There should have been 2 documents returned")
+            assertEquals(16, after[0].id.length, "The first document's ID was not generated correctly")
+            assertEquals(21, after[1].id.length, "The second document's ID was not generated correctly")
+        } finally {
+            Configuration.autoIdStrategy = AutoId.DISABLED
+            Configuration.idStringLength = 16
+        }
+    }
 }

src/integration-test/kotlin/postgresql/CustomIT.kt

@@ -14,35 +14,35 @@ class CustomIT {
     @Test
     @DisplayName("list succeeds with empty list")
     fun listEmpty() =
-        PgDB().use { Custom.listEmpty(it.conn) }
+        PgDB().use(Custom::listEmpty)
 
     @Test
     @DisplayName("list succeeds with a non-empty list")
     fun listAll() =
-        PgDB().use { Custom.listAll(it.conn) }
+        PgDB().use(Custom::listAll)
 
     @Test
     @DisplayName("single succeeds when document not found")
     fun singleNone() =
-        PgDB().use { Custom.singleNone(it.conn) }
+        PgDB().use(Custom::singleNone)
 
     @Test
     @DisplayName("single succeeds when a document is found")
     fun singleOne() =
-        PgDB().use { Custom.singleOne(it.conn) }
+        PgDB().use(Custom::singleOne)
 
     @Test
     @DisplayName("nonQuery makes changes")
     fun nonQueryChanges() =
-        PgDB().use { Custom.nonQueryChanges(it.conn) }
+        PgDB().use(Custom::nonQueryChanges)
 
     @Test
     @DisplayName("nonQuery makes no changes when where clause matches nothing")
     fun nonQueryNoChanges() =
-        PgDB().use { Custom.nonQueryNoChanges(it.conn) }
+        PgDB().use(Custom::nonQueryNoChanges)
 
     @Test
     @DisplayName("scalar succeeds")
     fun scalar() =
-        PgDB().use { Custom.scalar(it.conn) }
+        PgDB().use(Custom::scalar)
 }

src/integration-test/kotlin/postgresql/DefinitionIT.kt

@@ -0,0 +1,22 @@
+package solutions.bitbadger.documents.postgresql
+
+import org.junit.jupiter.api.DisplayName
+import solutions.bitbadger.documents.common.Definition
+import kotlin.test.Test
+
+/**
+ * PostgreSQL integration tests for the `Definition` object / `ensure*` connection extension functions
+ */
+@DisplayName("PostgreSQL - Definition")
+class DefinitionIT {
+
+    @Test
+    @DisplayName("ensureTable creates table and index")
+    fun ensureTable() =
+        PgDB().use(Definition::ensureTable)
+
+    @Test
+    @DisplayName("ensureFieldIndex creates an index")
+    fun ensureFieldIndex() =
+        PgDB().use(Definition::ensureFieldIndex)
+}

src/integration-test/kotlin/postgresql/DocumentIT.kt

@@ -13,15 +13,25 @@ class DocumentIT {
     @Test
     @DisplayName("insert works with default values")
     fun insertDefault() =
-        PgDB().use { Document.insertDefault(it.conn) }
+        PgDB().use(Document::insertDefault)
 
     @Test
     @DisplayName("insert fails with duplicate key")
     fun insertDupe() =
-        PgDB().use { Document.insertDupe(it.conn) }
+        PgDB().use(Document::insertDupe)
 
     @Test
     @DisplayName("insert succeeds with numeric auto IDs")
     fun insertNumAutoId() =
-        PgDB().use { Document.insertNumAutoId(it.conn) }
+        PgDB().use(Document::insertNumAutoId)
+
+    @Test
+    @DisplayName("insert succeeds with UUID auto ID")
+    fun insertUUIDAutoId() =
+        PgDB().use(Document::insertUUIDAutoId)
+
+    @Test
+    @DisplayName("insert succeeds with random string auto ID")
+    fun insertStringAutoId() =
+        PgDB().use(Document::insertStringAutoId)
 }

src/integration-test/kotlin/postgresql/PgDB.kt

@@ -1,14 +1,11 @@
 package solutions.bitbadger.documents.postgresql
 
-import solutions.bitbadger.documents.AutoId
+import solutions.bitbadger.documents.*
-import solutions.bitbadger.documents.Configuration
-import solutions.bitbadger.documents.customNonQuery
-import solutions.bitbadger.documents.ensureTable
 
 /**
  * A wrapper for a throwaway PostgreSQL database
  */
-class PgDB : AutoCloseable {
+class PgDB : ThrowawayDatabase {
 
     private var dbName = ""
 
@@ -21,10 +18,10 @@ class PgDB : AutoCloseable {
         Configuration.connectionString = connString(dbName)
     }
 
-    val conn = Configuration.dbConn()
+    override val conn = Configuration.dbConn()
 
     init {
-        conn.ensureTable(tableName)
+        conn.ensureTable(TEST_TABLE)
     }
 
     override fun close() {
@@ -36,10 +33,11 @@ class PgDB : AutoCloseable {
         Configuration.connectionString = null
     }
 
-    companion object {
+    override fun dbObjectExists(name: String) =
+        conn.customScalar("SELECT EXISTS (SELECT 1 FROM pg_class WHERE relname = :name) AS it",
+            listOf(Parameter(":name", ParameterType.STRING, name)), Results::toExists)
 
-        /** The table used for test documents */
+    companion object {
-        val tableName = "test_table"
 
         /**
          * Create a connection string for the given database

src/integration-test/kotlin/sqlite/CustomIT.kt

@@ -13,35 +13,35 @@ class CustomIT {
     @Test
     @DisplayName("list succeeds with empty list")
     fun listEmpty() =
-        SQLiteDB().use { Custom.listEmpty(it.conn) }
+        SQLiteDB().use(Custom::listEmpty)
 
     @Test
     @DisplayName("list succeeds with a non-empty list")
     fun listAll() =
-        SQLiteDB().use { Custom.listAll(it.conn) }
+        SQLiteDB().use(Custom::listAll)
 
     @Test
     @DisplayName("single succeeds when document not found")
     fun singleNone() =
-        SQLiteDB().use { Custom.singleNone(it.conn) }
+        SQLiteDB().use(Custom::singleNone)
 
     @Test
     @DisplayName("single succeeds when a document is found")
     fun singleOne() =
-        SQLiteDB().use { Custom.singleOne(it.conn) }
+        SQLiteDB().use(Custom::singleOne)
 
     @Test
     @DisplayName("nonQuery makes changes")
     fun nonQueryChanges() =
-        SQLiteDB().use { Custom.nonQueryChanges(it.conn) }
+        SQLiteDB().use(Custom::nonQueryChanges)
 
     @Test
     @DisplayName("nonQuery makes no changes when where clause matches nothing")
     fun nonQueryNoChanges() =
-        SQLiteDB().use { Custom.nonQueryNoChanges(it.conn) }
+        SQLiteDB().use(Custom::nonQueryNoChanges)
 
     @Test
     @DisplayName("scalar succeeds")
     fun scalar() =
-        SQLiteDB().use { Custom.scalar(it.conn) }
+        SQLiteDB().use(Custom::scalar)
 }

src/integration-test/kotlin/sqlite/DefinitionIT.kt

@@ -2,6 +2,7 @@ package solutions.bitbadger.documents.sqlite
 
 import org.junit.jupiter.api.DisplayName
 import solutions.bitbadger.documents.*
+import solutions.bitbadger.documents.common.Definition
 import java.sql.Connection
 import kotlin.test.Test
 import kotlin.test.assertFalse
@@ -13,34 +14,13 @@ import kotlin.test.assertTrue
 @DisplayName("SQLite - Definition")
 class DefinitionIT {
 
-    /**
-     * Determine if a database item exists
-     *
-     * @param item The items whose existence should be checked
-     * @param conn The current database connection
-     * @return True if the item exists in the given database, false if not
-     */
-    private fun itExists(item: String, conn: Connection) =
-        conn.customScalar("SELECT EXISTS (SELECT 1 FROM ${SQLiteDB.CATALOG} WHERE name = :name) AS it",
-            listOf(Parameter(":name", ParameterType.STRING, item)), Results::toExists)
-
     @Test
     @DisplayName("ensureTable creates table and index")
     fun ensureTable() =
-        SQLiteDB().use { db ->
+        SQLiteDB().use(Definition::ensureTable)
-            assertFalse(itExists("ensured", db.conn), "The 'ensured' table should not exist")
-            assertFalse(itExists("idx_ensured_key", db.conn), "The PK index for the 'ensured' table should not exist")
-            db.conn.ensureTable("ensured")
-            assertTrue(itExists("ensured", db.conn), "The 'ensured' table should exist")
-            assertTrue(itExists("idx_ensured_key", db.conn), "The PK index for the 'ensured' table should now exist")
-        }
 
     @Test
     @DisplayName("ensureFieldIndex creates an index")
     fun ensureFieldIndex() =
-        SQLiteDB().use { db ->
+        SQLiteDB().use(Definition::ensureFieldIndex)
-            assertFalse(itExists("idx_${TEST_TABLE}_test", db.conn), "The test index should not exist")
-            db.conn.ensureFieldIndex(TEST_TABLE, "test", listOf("id", "category"))
-            assertTrue(itExists("idx_${TEST_TABLE}_test", db.conn), "The test index should now exist")
-        }
 }

src/integration-test/kotlin/sqlite/DocumentIT.kt

@@ -13,16 +13,25 @@ class DocumentIT {
     @Test
     @DisplayName("insert works with default values")
     fun insertDefault() =
-        SQLiteDB().use { Document.insertDefault(it.conn) }
+        SQLiteDB().use(Document::insertDefault)
 
     @Test
     @DisplayName("insert fails with duplicate key")
     fun insertDupe() =
-        SQLiteDB().use { Document.insertDupe(it.conn) }
+        SQLiteDB().use(Document::insertDupe)
 
     @Test
     @DisplayName("insert succeeds with numeric auto IDs")
     fun insertNumAutoId() =
-        SQLiteDB().use { Document.insertNumAutoId(it.conn) }
+        SQLiteDB().use(Document::insertNumAutoId)
 
+    @Test
+    @DisplayName("insert succeeds with UUID auto ID")
+    fun insertUUIDAutoId() =
+        SQLiteDB().use(Document::insertUUIDAutoId)
+
+    @Test
+    @DisplayName("insert succeeds with random string auto ID")
+    fun insertStringAutoId() =
+        SQLiteDB().use(Document::insertStringAutoId)
 }

src/integration-test/kotlin/sqlite/SQLiteDB.kt

@@ -1,15 +1,13 @@
 package solutions.bitbadger.documents.sqlite
 
-import solutions.bitbadger.documents.AutoId
+import solutions.bitbadger.documents.*
-import solutions.bitbadger.documents.Configuration
-import solutions.bitbadger.documents.TEST_TABLE
-import solutions.bitbadger.documents.ensureTable
 import java.io.File
+import java.sql.Connection
 
 /**
  * A wrapper for a throwaway SQLite database
  */
-class SQLiteDB : AutoCloseable {
+class SQLiteDB : ThrowawayDatabase {
 
     private var dbName = ""
 
@@ -18,7 +16,7 @@ class SQLiteDB : AutoCloseable {
         Configuration.connectionString = "jdbc:sqlite:$dbName"
     }
 
-    val conn = Configuration.dbConn()
+    override val conn = Configuration.dbConn()
 
     init {
         conn.ensureTable(TEST_TABLE)
@@ -29,9 +27,7 @@ class SQLiteDB : AutoCloseable {
         File(dbName).delete()
     }
 
-    companion object {
+    override fun dbObjectExists(name: String) =
-
+        conn.customScalar("SELECT EXISTS (SELECT 1 FROM sqlite_master WHERE name = :name) AS it",
-        /** The catalog table for SQLite's schema */
+            listOf(Parameter(":name", ParameterType.STRING, name)), Results::toExists)
-        const val CATALOG = "sqlite_master"
-    }
 }

src/main/kotlin/Comparison.kt

@@ -21,4 +21,7 @@ class Comparison<T>(val op: Op, val value: T) {
             }
             return toCheck is Byte || toCheck is Short || toCheck is Int || toCheck is Long
         }
+
+    override fun toString() =
+        "$op $value"
 }

src/main/kotlin/ConnectionExtensions.kt

@@ -114,3 +114,24 @@ inline fun <reified TDoc> Connection.findAll(tableName: String) =
  */
 inline fun <reified TDoc> Connection.findAll(tableName: String, orderBy: Collection<Field<*>>) =
     Find.all<TDoc>(tableName, orderBy, this)
+
+// ~~~ DOCUMENT DELETION QUERIES ~~~
+
+/**
+ * Delete a document by its ID
+ *
+ * @param tableName The name of the table from which documents should be deleted
+ * @param docId The ID of the document to be deleted
+ */
+fun <TKey> Connection.byId(tableName: String, docId: TKey) =
+    Delete.byId(tableName, docId, this)
+
+/**
+ * Delete documents using a field comparison
+ *
+ * @param tableName The name of the table from which documents should be deleted
+ * @param fields The fields which should be compared
+ * @param howMatched How the fields should be matched
+ */
+fun Connection.deleteByFields(tableName: String, fields: Collection<Field<*>>, howMatched: FieldMatch? = null) =
+    Delete.byField(tableName, fields, howMatched, this)

src/main/kotlin/Delete.kt

@@ -0,0 +1,55 @@
+package solutions.bitbadger.documents
+
+import solutions.bitbadger.documents.query.Delete
+import java.sql.Connection
+
+/**
+ * Functions to delete documents
+ */
+object Delete {
+
+    /**
+     * Delete a document by its ID
+     *
+     * @param tableName The name of the table from which documents should be deleted
+     * @param docId The ID of the document to be deleted
+     * @param conn The connection on which the deletion should be executed
+     */
+    fun <TKey> byId(tableName: String, docId: TKey, conn: Connection) =
+        conn.customNonQuery(
+            Delete.byId(tableName, docId),
+            Parameters.addFields(listOf(Field.equal(Configuration.idField, docId)))
+        )
+
+    /**
+     * Delete a document by its ID
+     *
+     * @param tableName The name of the table from which documents should be deleted
+     * @param docId The ID of the document to be deleted
+     */
+    fun <TKey> byId(tableName: String, docId: TKey) =
+        Configuration.dbConn().use { byId(tableName, docId, it) }
+
+    /**
+     * Delete documents using a field comparison
+     *
+     * @param tableName The name of the table from which documents should be deleted
+     * @param fields The fields which should be compared
+     * @param howMatched How the fields should be matched
+     * @param conn The connection on which the deletion should be executed
+     */
+    fun byField(tableName: String, fields: Collection<Field<*>>, howMatched: FieldMatch? = null, conn: Connection) {
+        val named = Parameters.nameFields(fields)
+        conn.customNonQuery(Delete.byFields(tableName, named, howMatched), Parameters.addFields(named))
+    }
+
+    /**
+     * Delete documents using a field comparison
+     *
+     * @param tableName The name of the table from which documents should be deleted
+     * @param fields The fields which should be compared
+     * @param howMatched How the fields should be matched
+     */
+    fun byField(tableName: String, fields: Collection<Field<*>>, howMatched: FieldMatch? = null) =
+        Configuration.dbConn().use { byField(tableName, fields, howMatched, it) }
+}

src/main/kotlin/Field.kt

@@ -92,6 +92,9 @@ class Field<T> private constructor(
         }
     }
 
+    override fun toString() =
+        "Field ${parameterName ?: "<unnamed>"} $comparison${qualifier?.let { " (qualifier $it)"} ?: ""}"
+
     companion object {
 
         /**

src/main/kotlin/Parameters.kt

@@ -39,6 +39,30 @@ object Parameters {
     inline fun <reified T> json(name: String, value: T) =
         Parameter(name, ParameterType.JSON, Configuration.json.encodeToString(value))
 
+    /**
+     * Add field parameters to the given set of parameters
+     *
+     * @param fields The fields being compared in the query
+     * @param existing Any existing parameters for the query (optional, defaults to empty collection)
+     * @return A collection of parameters for the query
+     */
+    fun addFields(
+        fields: Collection<Field<*>>,
+        existing: MutableCollection<Parameter<*>> = mutableListOf()
+    ): MutableCollection<Parameter<*>> {
+        existing.addAll(
+            fields
+                .filter { it.comparison.op != Op.EXISTS && it.comparison.op != Op.NOT_EXISTS }
+                .map {
+                    Parameter(
+                        it.parameterName!!,
+                        if (it.comparison.isNumeric) ParameterType.NUMBER else ParameterType.STRING,
+                        it.comparison.value
+                    )
+                })
+        return existing
+    }
+
     /**
      * Replace the parameter names in the query with question marks
      *
@@ -47,7 +71,7 @@ object Parameters {
      * @return The query, with name parameters changed to `?`s
      */
     fun replaceNamesInQuery(query: String, parameters: Collection<Parameter<*>>) =
-        parameters.sortedByDescending { it.name.length }.fold(query) { acc, param -> acc.replace(param.name, "?") }.also(::println)
+        parameters.sortedByDescending { it.name.length }.fold(query) { acc, param -> acc.replace(param.name, "?") }
 
     /**
      * Apply the given parameters to the given query, returning a prepared statement