diff --git a/src/main/kotlin/AutoId.kt b/src/main/kotlin/AutoId.kt
index 1d8da22..a5bfa54 100644
--- a/src/main/kotlin/AutoId.kt
+++ b/src/main/kotlin/AutoId.kt
@@ -45,15 +45,15 @@ enum class AutoId {
          * @param document The document whose need of an automatic ID should be determined
          * @param idProp The name of the document property containing the ID
          * @return `true` if the document needs an automatic ID, `false` if not
-         * @throws IllegalArgumentException If bad input prevents the determination
+         * @throws DocumentException If bad input prevents the determination
          */
         fun <T> needsAutoId(strategy: AutoId, document: T, idProp: String): Boolean {
-            if (document == null) throw IllegalArgumentException("document cannot be null")
+            if (document == null) throw DocumentException("document cannot be null")
 
             if (strategy == DISABLED) return false;
 
             val id = document!!::class.memberProperties.find { it.name == idProp }
-            if (id == null) throw IllegalArgumentException("$idProp not found in document")
+            if (id == null) throw DocumentException("$idProp not found in document")
 
             if (strategy == NUMBER) {
                 return when (id.returnType) {
@@ -61,7 +61,7 @@ enum class AutoId {
                     Short::class.createType() -> id.call(document) == 0.toShort()
                     Int::class.createType()   -> id.call(document) == 0
                     Long::class.createType()  -> id.call(document) == 0.toLong()
-                    else -> throw IllegalArgumentException("$idProp was not a number; cannot auto-generate number ID")
+                    else -> throw DocumentException("$idProp was not a number; cannot auto-generate number ID")
                 }
             }
 
@@ -69,7 +69,7 @@ enum class AutoId {
                 return id.call(document) == ""
             }
 
-            throw IllegalArgumentException("$idProp was not a string; cannot auto-generate UUID or random string")
+            throw DocumentException("$idProp was not a string; cannot auto-generate UUID or random string")
         }
     }
 }
diff --git a/src/main/kotlin/Comparison.kt b/src/main/kotlin/Comparison.kt
index bcb4226..987f946 100644
--- a/src/main/kotlin/Comparison.kt
+++ b/src/main/kotlin/Comparison.kt
@@ -10,16 +10,15 @@ class Comparison<T>(val op: Op, val value: T) {
 
     /** Is the value for this comparison a numeric value? */
     val isNumeric: Boolean
-        get() =
-            if (op == Op.IN || op == Op.BETWEEN) {
-                val values = value as? Collection<*>
-                if (values.isNullOrEmpty()) {
-                    false
-                } else {
-                    val first = values.elementAt(0)
-                    first is Byte || first is Short || first is Int || first is Long
+        get() {
+            val toCheck = when (op) {
+                Op.IN      -> {
+                    val values = value as? Collection<*>
+                    if (values.isNullOrEmpty()) "" else  values.elementAt(0)
                 }
-            } else {
-                value is Byte || value is Short || value is Int || value is Long
+                Op.BETWEEN -> (value as Pair<*, *>).first
+                else       -> value
             }
+            return toCheck is Byte || toCheck is Short || toCheck is Int || toCheck is Long
+        }
 }
diff --git a/src/main/kotlin/Dialect.kt b/src/main/kotlin/Dialect.kt
index e19807d..986dddb 100644
--- a/src/main/kotlin/Dialect.kt
+++ b/src/main/kotlin/Dialect.kt
@@ -20,8 +20,8 @@ enum class Dialect {
          */
         fun deriveFromConnectionString(connectionString: String): Dialect =
             when {
-                connectionString.contains("sqlite") -> SQLITE
-                connectionString.contains("postgresql") -> POSTGRESQL
+                connectionString.contains(":sqlite:")     -> SQLITE
+                connectionString.contains(":postgresql:") -> POSTGRESQL
                 else -> throw DocumentException("Cannot determine dialect from [$connectionString]")
             }
     }
diff --git a/src/main/kotlin/Field.kt b/src/main/kotlin/Field.kt
index 1c8102d..11fb00d 100644
--- a/src/main/kotlin/Field.kt
+++ b/src/main/kotlin/Field.kt
@@ -20,8 +20,11 @@ class Field<T> private constructor(
      * @param paramName The parameter name to use for this field
      * @return A new `Field` with the parameter name specified
      */
-    fun withParameterName(paramName: String): Field<T> =
-        Field(name, comparison, paramName, qualifier)
+    fun withParameterName(paramName: String): Field<T> {
+        if (!paramName.startsWith(':') && !paramName.startsWith('@'))
+            throw DocumentException("Parameter must start with : or @ ($paramName)")
+        return Field(name, comparison, paramName, qualifier)
+    }
 
     /**
      * Specify a qualifier (alias) for the document table
@@ -29,7 +32,7 @@ class Field<T> private constructor(
      * @param alias The table alias for this field
      * @return A new `Field` with the table qualifier specified
      */
-    fun withQualifier(alias: String): Field<T> =
+    fun withQualifier(alias: String) =
         Field(name, comparison, parameterName, alias)
 
     /**
@@ -74,16 +77,16 @@ class Field<T> private constructor(
             in listOf(Op.EXISTS, Op.NOT_EXISTS) -> ""
             Op.BETWEEN  -> " ${parameterName}min AND ${parameterName}max"
             Op.IN       -> " ($inParameterNames)"
-            Op.IN_ARRAY -> if (dialect == Dialect.POSTGRESQL) " ARRAY['$inParameterNames']" else ""
+            Op.IN_ARRAY -> if (dialect == Dialect.POSTGRESQL) " ARRAY[$inParameterNames]" else ""
             else        -> " $parameterName"
         }
 
         @Suppress("UNCHECKED_CAST")
         return if (dialect == Dialect.SQLITE && comparison.op == Op.IN_ARRAY) {
             val (table, _) = comparison.value as? Pair<String, *> ?: throw DocumentException("InArray field invalid")
-            "EXISTS (SELECT 1 FROM json_each($table.data, '$.$name') WHERE value IN ($inParameterNames)"
+            "EXISTS (SELECT 1 FROM json_each($table.data, '$.$name') WHERE value IN ($inParameterNames))"
         } else {
-            "$fieldPath ${comparison.op.sql} $criteria"
+            "$fieldPath ${comparison.op.sql}$criteria"
         }
     }
 
@@ -94,60 +97,66 @@ class Field<T> private constructor(
          *
          * @param name The name of the field to be compared
          * @param value The value for the comparison
+         * @param paramName The parameter name for the field (optional, defaults to auto-generated)
          * @return A `Field` with the given comparison
          */
-        fun <T> equal(name: String, value: T) =
-            Field(name, Comparison(Op.EQUAL, value))
+        fun <T> equal(name: String, value: T, paramName: String? = null) =
+            Field(name, Comparison(Op.EQUAL, value), paramName)
 
         /**
          * Create a field greater-than comparison
          *
          * @param name The name of the field to be compared
          * @param value The value for the comparison
+         * @param paramName The parameter name for the field (optional, defaults to auto-generated)
          * @return A `Field` with the given comparison
          */
-        fun <T> greater(name: String, value: T) =
-            Field(name, Comparison(Op.GREATER, value))
+        fun <T> greater(name: String, value: T, paramName: String? = null) =
+            Field(name, Comparison(Op.GREATER, value), paramName)
 
         /**
          * Create a field greater-than-or-equal-to comparison
          *
          * @param name The name of the field to be compared
          * @param value The value for the comparison
+         * @param paramName The parameter name for the field (optional, defaults to auto-generated)
          * @return A `Field` with the given comparison
          */
-        fun <T> greaterOrEqual(name: String, value: T) =
-            Field(name, Comparison(Op.GREATER_OR_EQUAL, value))
+        fun <T> greaterOrEqual(name: String, value: T, paramName: String? = null) =
+            Field(name, Comparison(Op.GREATER_OR_EQUAL, value), paramName)
 
         /**
          * Create a field less-than comparison
          *
          * @param name The name of the field to be compared
          * @param value The value for the comparison
+         * @param paramName The parameter name for the field (optional, defaults to auto-generated)
          * @return A `Field` with the given comparison
          */
-        fun <T> less(name: String, value: T) =
-            Field(name, Comparison(Op.LESS, value))
+        fun <T> less(name: String, value: T, paramName: String? = null) =
+            Field(name, Comparison(Op.LESS, value), paramName)
 
         /**
          * Create a field less-than-or-equal-to comparison
          *
          * @param name The name of the field to be compared
          * @param value The value for the comparison
+         * @param paramName The parameter name for the field (optional, defaults to auto-generated)
          * @return A `Field` with the given comparison
          */
-        fun <T> lessOrEqual(name: String, value: T) =
-            Field(name, Comparison(Op.LESS_OR_EQUAL, value))
+        fun <T> lessOrEqual(name: String, value: T, paramName: String? = null) =
+            Field(name, Comparison(Op.LESS_OR_EQUAL, value), paramName)
 
         /**
          * Create a field inequality comparison
          *
          * @param name The name of the field to be compared
          * @param value The value for the comparison
+         * @param paramName The parameter name for the field (optional, defaults to auto-generated)
          * @return A `Field` with the given comparison
          */
-        fun <T> notEqual(name: String, value: T) =
-            Field(name, Comparison(Op.NOT_EQUAL, value))
+        fun <T> notEqual(name: String, value: T, paramName: String? = null) =
+            Field(name, Comparison(Op.NOT_EQUAL, value), paramName)
 
         /**
          * Create a field range comparison
@@ -155,20 +164,22 @@ class Field<T> private constructor(
          * @param name The name of the field to be compared
          * @param minValue The lower value for the comparison
          * @param maxValue The upper value for the comparison
+         * @param paramName The parameter name for the field (optional, defaults to auto-generated)
          * @return A `Field` with the given comparison
          */
-        fun <T> between(name: String, minValue: T, maxValue: T) =
-            Field(name, Comparison(Op.BETWEEN, Pair(minValue, maxValue)))
+        fun <T> between(name: String, minValue: T, maxValue: T, paramName: String? = null) =
+            Field(name, Comparison(Op.BETWEEN, Pair(minValue, maxValue)), paramName)
 
         /**
          * Create a field where any values match (SQL `IN`)
          *
          * @param name The name of the field to be compared
          * @param values The values for the comparison
+         * @param paramName The parameter name for the field (optional, defaults to auto-generated)
          * @return A `Field` with the given comparison
          */
-        fun <T> any(name: String, values: List<T>) =
-            Field(name, Comparison(Op.IN, values))
+        fun <T> any(name: String, values: Collection<T>, paramName: String? = null) =
+            Field(name, Comparison(Op.IN, values), paramName)
 
         /**
          * Create a field where values should exist in a document's array
@@ -176,10 +187,11 @@ class Field<T> private constructor(
          * @param name The name of the field to be compared
          * @param tableName The name of the document table
          * @param values The values for the comparison
+         * @param paramName The parameter name for the field (optional, defaults to auto-generated)
          * @return A `Field` with the given comparison
          */
-        fun <T> inArray(name: String, tableName: String, values: List<T>) =
-            Field(name, Comparison(Op.IN_ARRAY, Pair(tableName, values)))
+        fun <T> inArray(name: String, tableName: String, values: Collection<T>, paramName: String? = null) =
+            Field(name, Comparison(Op.IN_ARRAY, Pair(tableName, values)), paramName)
 
         fun exists(name: String) =
             Field(name, Comparison(Op.EXISTS, ""))
diff --git a/src/main/kotlin/Query.kt b/src/main/kotlin/Query.kt
index 8348c35..6852f91 100644
--- a/src/main/kotlin/Query.kt
+++ b/src/main/kotlin/Query.kt
@@ -34,7 +34,7 @@ object Query {
          * @param docId The ID value (optional; used for type determinations, string assumed if not provided)
          */
         fun <TKey> byId(parameterName: String = ":id", docId: TKey? = null) =
-            byFields(listOf(Field.equal(Configuration.idField, docId ?: "").withParameterName(parameterName)))
+            byFields(listOf(Field.equal(Configuration.idField, docId ?: "", parameterName)))
 
         /**
          * Create a `WHERE` clause fragment to implement a JSON containment query (PostgreSQL only)
diff --git a/src/test/kotlin/AutoIdTest.kt b/src/test/kotlin/AutoIdTest.kt
index 1098e1d..f99c0e0 100644
--- a/src/test/kotlin/AutoIdTest.kt
+++ b/src/test/kotlin/AutoIdTest.kt
@@ -12,9 +12,8 @@ class AutoIdTest {
 
     @Test
     @DisplayName("Generates a UUID string")
-    fun generateUUID() {
+    fun generateUUID() =
         assertEquals(32, AutoId.generateUUID().length, "The UUID should have been a 32-character string")
-    }
 
     @Test
     @DisplayName("Generates a random hex character string of an even length")
@@ -41,120 +40,107 @@ class AutoIdTest {
     @Test
     @DisplayName("needsAutoId fails for null document")
     fun needsAutoIdFailsForNullDocument() {
-        assertThrows<IllegalArgumentException> { AutoId.needsAutoId(AutoId.DISABLED, null, "id") }
+        assertThrows<DocumentException> { AutoId.needsAutoId(AutoId.DISABLED, null, "id") }
     }
 
     @Test
     @DisplayName("needsAutoId fails for missing ID property")
     fun needsAutoIdFailsForMissingId() {
-        assertThrows<IllegalArgumentException> { AutoId.needsAutoId(AutoId.UUID, IntIdClass(0), "Id") }
+        assertThrows<DocumentException> { AutoId.needsAutoId(AutoId.UUID, IntIdClass(0), "Id") }
     }
 
     @Test
     @DisplayName("needsAutoId returns false if disabled")
-    fun needsAutoIdFalseIfDisabled() {
+    fun needsAutoIdFalseIfDisabled() =
         assertFalse(AutoId.needsAutoId(AutoId.DISABLED, "", ""), "Disabled Auto ID should always return false")
-    }
 
     @Test
     @DisplayName("needsAutoId returns true for Number strategy and byte ID of 0")
-    fun needsAutoIdTrueForByteWithZero() {
+    fun needsAutoIdTrueForByteWithZero() =
         assertTrue(AutoId.needsAutoId(AutoId.NUMBER, ByteIdClass(0), "id"), "Number Auto ID with 0 should return true")
-    }
 
     @Test
     @DisplayName("needsAutoId returns false for Number strategy and byte ID of non-0")
-    fun needsAutoIdFalseForByteWithNonZero() {
+    fun needsAutoIdFalseForByteWithNonZero() =
         assertFalse(AutoId.needsAutoId(AutoId.NUMBER, ByteIdClass(77), "id"),
             "Number Auto ID with 77 should return false")
-    }
 
     @Test
     @DisplayName("needsAutoId returns true for Number strategy and short ID of 0")
-    fun needsAutoIdTrueForShortWithZero() {
+    fun needsAutoIdTrueForShortWithZero() =
         assertTrue(AutoId.needsAutoId(AutoId.NUMBER, ShortIdClass(0), "id"), "Number Auto ID with 0 should return true")
-    }
 
     @Test
     @DisplayName("needsAutoId returns false for Number strategy and short ID of non-0")
-    fun needsAutoIdFalseForShortWithNonZero() {
+    fun needsAutoIdFalseForShortWithNonZero() =
         assertFalse(AutoId.needsAutoId(AutoId.NUMBER, ShortIdClass(31), "id"),
             "Number Auto ID with 31 should return false")
-    }
 
     @Test
     @DisplayName("needsAutoId returns true for Number strategy and int ID of 0")
-    fun needsAutoIdTrueForIntWithZero() {
+    fun needsAutoIdTrueForIntWithZero() =
         assertTrue(AutoId.needsAutoId(AutoId.NUMBER, IntIdClass(0), "id"), "Number Auto ID with 0 should return true")
-    }
 
     @Test
     @DisplayName("needsAutoId returns false for Number strategy and int ID of non-0")
-    fun needsAutoIdFalseForIntWithNonZero() {
+    fun needsAutoIdFalseForIntWithNonZero() =
         assertFalse(AutoId.needsAutoId(AutoId.NUMBER, IntIdClass(6), "id"), "Number Auto ID with 6 should return false")
-    }
 
     @Test
     @DisplayName("needsAutoId returns true for Number strategy and long ID of 0")
-    fun needsAutoIdTrueForLongWithZero() {
+    fun needsAutoIdTrueForLongWithZero() =
         assertTrue(AutoId.needsAutoId(AutoId.NUMBER, LongIdClass(0), "id"), "Number Auto ID with 0 should return true")
-    }
 
     @Test
     @DisplayName("needsAutoId returns false for Number strategy and long ID of non-0")
-    fun needsAutoIdFalseForLongWithNonZero() {
+    fun needsAutoIdFalseForLongWithNonZero() =
         assertFalse(AutoId.needsAutoId(AutoId.NUMBER, IntIdClass(2), "id"), "Number Auto ID with 2 should return false")
-    }
 
     @Test
     @DisplayName("needsAutoId fails for Number strategy and non-number ID")
     fun needsAutoIdFailsForNumberWithStringId() {
-        assertThrows<IllegalArgumentException> { AutoId.needsAutoId(AutoId.NUMBER, StringIdClass(""), "id") }
+        assertThrows<DocumentException> { AutoId.needsAutoId(AutoId.NUMBER, StringIdClass(""), "id") }
     }
 
     @Test
     @DisplayName("needsAutoId returns true for UUID strategy and blank ID")
-    fun needsAutoIdTrueForUUIDWithBlank() {
+    fun needsAutoIdTrueForUUIDWithBlank() =
         assertTrue(AutoId.needsAutoId(AutoId.UUID, StringIdClass(""), "id"),
             "UUID Auto ID with blank should return true")
-    }
 
     @Test
     @DisplayName("needsAutoId returns false for UUID strategy and non-blank ID")
-    fun needsAutoIdFalseForUUIDNotBlank() {
+    fun needsAutoIdFalseForUUIDNotBlank() =
         assertFalse(AutoId.needsAutoId(AutoId.UUID, StringIdClass("howdy"), "id"),
             "UUID Auto ID with non-blank should return false")
-    }
 
     @Test
     @DisplayName("needsAutoId fails for UUID strategy and non-string ID")
     fun needsAutoIdFailsForUUIDNonString() {
-        assertThrows<IllegalArgumentException> { AutoId.needsAutoId(AutoId.UUID, IntIdClass(5), "id") }
+        assertThrows<DocumentException> { AutoId.needsAutoId(AutoId.UUID, IntIdClass(5), "id") }
     }
 
     @Test
     @DisplayName("needsAutoId returns true for Random String strategy and blank ID")
-    fun needsAutoIdTrueForRandomWithBlank() {
+    fun needsAutoIdTrueForRandomWithBlank() =
         assertTrue(AutoId.needsAutoId(AutoId.RANDOM_STRING, StringIdClass(""), "id"),
             "Random String Auto ID with blank should return true")
-    }
 
     @Test
     @DisplayName("needsAutoId returns false for Random String strategy and non-blank ID")
-    fun needsAutoIdFalseForRandomNotBlank() {
+    fun needsAutoIdFalseForRandomNotBlank() =
         assertFalse(AutoId.needsAutoId(AutoId.RANDOM_STRING, StringIdClass("full"), "id"),
             "Random String Auto ID with non-blank should return false")
-    }
 
     @Test
     @DisplayName("needsAutoId fails for Random String strategy and non-string ID")
     fun needsAutoIdFailsForRandomNonString() {
-        assertThrows<IllegalArgumentException> { AutoId.needsAutoId(AutoId.RANDOM_STRING, ShortIdClass(55), "id") }
+        assertThrows<DocumentException> { AutoId.needsAutoId(AutoId.RANDOM_STRING, ShortIdClass(55), "id") }
     }
 }
 
-data class ByteIdClass(var id: Byte)
-data class ShortIdClass(var id: Short)
-data class IntIdClass(var id: Int)
-data class LongIdClass(var id: Long)
-data class StringIdClass(var id: String)
+data class ByteIdClass(val id: Byte)
+data class ShortIdClass(val id: Short)
+data class IntIdClass(val id: Int)
+data class LongIdClass(val id: Long)
+data class StringIdClass(val id: String)
diff --git a/src/test/kotlin/ComparisonTest.kt b/src/test/kotlin/ComparisonTest.kt
new file mode 100644
index 0000000..7c015e0
--- /dev/null
+++ b/src/test/kotlin/ComparisonTest.kt
@@ -0,0 +1,91 @@
+package solutions.bitbadger.documents
+
+import org.junit.jupiter.api.DisplayName
+import org.junit.jupiter.api.Test
+import kotlin.test.assertFalse
+import kotlin.test.assertTrue
+
+class ComparisonTest {
+
+    @Test
+    @DisplayName("isNumeric is false for empty list of values")
+    fun isNumericFalseForEmptyList() =
+        assertFalse(Comparison(Op.IN, listOf<Int>()).isNumeric, "An IN with empty list should not be numeric")
+
+    @Test
+    @DisplayName("isNumeric is false for IN with strings")
+    fun isNumericFalseForStringsAndIn() =
+        assertFalse(Comparison(Op.IN, listOf("a", "b", "c")).isNumeric, "An IN with strings should not be numeric")
+
+    @Test
+    @DisplayName("isNumeric is true for IN with bytes")
+    fun isNumericTrueForByteAndIn() =
+        assertTrue(Comparison(Op.IN, listOf<Byte>(4, 8)).isNumeric, "An IN with bytes should be numeric")
+
+    @Test
+    @DisplayName("isNumeric is true for IN with shorts")
+    fun isNumericTrueForShortAndIn() =
+        assertTrue(Comparison(Op.IN, listOf<Short>(18, 22)).isNumeric, "An IN with shorts should be numeric")
+
+    @Test
+    @DisplayName("isNumeric is true for IN with ints")
+    fun isNumericTrueForIntAndIn() =
+        assertTrue(Comparison(Op.IN, listOf(7, 8, 9)).isNumeric, "An IN with ints should be numeric")
+
+    @Test
+    @DisplayName("isNumeric is true for IN with longs")
+    fun isNumericTrueForLongAndIn() =
+        assertTrue(Comparison(Op.IN, listOf(3L)).isNumeric, "An IN with longs should be numeric")
+
+    @Test
+    @DisplayName("isNumeric is false for BETWEEN with strings")
+    fun isNumericFalseForStringsAndBetween() =
+        assertFalse(Comparison(Op.BETWEEN, Pair("eh", "zed")).isNumeric,
+            "A BETWEEN with strings should not be numeric")
+
+    @Test
+    @DisplayName("isNumeric is true for BETWEEN with bytes")
+    fun isNumericTrueForByteAndBetween() =
+        assertTrue(Comparison(Op.BETWEEN, Pair<Byte, Byte>(7, 11)).isNumeric, "A BETWEEN with bytes should be numeric")
+
+    @Test
+    @DisplayName("isNumeric is true for BETWEEN with shorts")
+    fun isNumericTrueForShortAndBetween() =
+        assertTrue(Comparison(Op.BETWEEN, Pair<Short, Short>(0, 9)).isNumeric,
+            "A BETWEEN with shorts should be numeric")
+
+    @Test
+    @DisplayName("isNumeric is true for BETWEEN with ints")
+    fun isNumericTrueForIntAndBetween() =
+        assertTrue(Comparison(Op.BETWEEN, Pair(15, 44)).isNumeric, "A BETWEEN with ints should be numeric")
+
+    @Test
+    @DisplayName("isNumeric is true for BETWEEN with longs")
+    fun isNumericTrueForLongAndBetween() =
+        assertTrue(Comparison(Op.BETWEEN, Pair(9L, 12L)).isNumeric, "A BETWEEN with longs should be numeric")
+
+    @Test
+    @DisplayName("isNumeric is false for string value")
+    fun isNumericFalseForString() =
+        assertFalse(Comparison(Op.EQUAL, "80").isNumeric, "A string should not be numeric")
+
+    @Test
+    @DisplayName("isNumeric is true for byte value")
+    fun isNumericTrueForByte() =
+        assertTrue(Comparison(Op.EQUAL, 47.toByte()).isNumeric, "A byte should be numeric")
+
+    @Test
+    @DisplayName("isNumeric is true for short value")
+    fun isNumericTrueForShort() =
+        assertTrue(Comparison(Op.EQUAL, 2.toShort()).isNumeric, "A short should be numeric")
+
+    @Test
+    @DisplayName("isNumeric is true for int value")
+    fun isNumericTrueForInt() =
+        assertTrue(Comparison(Op.EQUAL, 555).isNumeric, "An int should be numeric")
+
+    @Test
+    @DisplayName("isNumeric is true for long value")
+    fun isNumericTrueForLong() =
+        assertTrue(Comparison(Op.EQUAL, 82L).isNumeric, "A long should be numeric")
+}
diff --git a/src/test/kotlin/ConfigurationTest.kt b/src/test/kotlin/ConfigurationTest.kt
index 8dc67d1..cc8f06d 100644
--- a/src/test/kotlin/ConfigurationTest.kt
+++ b/src/test/kotlin/ConfigurationTest.kt
@@ -2,10 +2,20 @@ package solutions.bitbadger.documents
 
 import org.junit.jupiter.api.DisplayName
 import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.assertThrows
 import kotlin.test.assertEquals
+import kotlin.test.assertFalse
+import kotlin.test.assertTrue
 
 class ConfigurationTest {
 
+    @Test
+    @DisplayName("Default JSON options are as expected")
+    fun defaultJsonOptions() {
+        assertTrue(Configuration.json.configuration.encodeDefaults, "Encode Defaults should have been set")
+        assertFalse(Configuration.json.configuration.explicitNulls, "Explicit Nulls should not have been set")
+    }
+
     @Test
     @DisplayName("Default ID field is `id`")
     fun defaultIdField() {
@@ -23,4 +33,16 @@ class ConfigurationTest {
     fun defaultIdStringLength() {
         assertEquals(16, Configuration.idStringLength, "Default ID string length should be 16")
     }
+
+    @Test
+    @DisplayName("Dialect is derived from connection string")
+    fun dialectIsDerived() {
+        try {
+            assertThrows<DocumentException> { Configuration.dialect() }
+            Configuration.connectionString = "jdbc:postgresql:db"
+            assertEquals(Dialect.POSTGRESQL, Configuration.dialect())
+        } finally {
+            Configuration.connectionString = null
+        }
+    }
 }
diff --git a/src/test/kotlin/DialectTest.kt b/src/test/kotlin/DialectTest.kt
new file mode 100644
index 0000000..a7e4015
--- /dev/null
+++ b/src/test/kotlin/DialectTest.kt
@@ -0,0 +1,34 @@
+package solutions.bitbadger.documents
+
+import org.junit.jupiter.api.DisplayName
+import org.junit.jupiter.api.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertNotNull
+import kotlin.test.assertTrue
+
+class DialectTest {
+
+    @Test
+    @DisplayName("deriveFromConnectionString derives PostgreSQL correctly")
+    fun derivesPostgres() =
+        assertEquals(Dialect.POSTGRESQL, Dialect.deriveFromConnectionString("jdbc:postgresql:db"),
+            "Dialect should have been PostgreSQL")
+
+    @Test
+    @DisplayName("deriveFromConnectionString derives PostgreSQL correctly")
+    fun derivesSQLite() =
+        assertEquals(Dialect.SQLITE, Dialect.deriveFromConnectionString("jdbc:sqlite:memory"),
+            "Dialect should have been SQLite")
+
+    @Test
+    @DisplayName("deriveFromConnectionString fails when the connection string is unknown")
+    fun deriveFailsWhenUnknown() {
+        try {
+            Dialect.deriveFromConnectionString("SQL Server")
+        } catch (ex: DocumentException) {
+            assertNotNull(ex.message, "The exception message should not have been null")
+            assertTrue(ex.message!!.contains("[SQL Server]"),
+                "The connection string should have been in the exception message")
+        }
+    }
+}
diff --git a/src/test/kotlin/FieldTest.kt b/src/test/kotlin/FieldTest.kt
index 1114e0b..9782532 100644
--- a/src/test/kotlin/FieldTest.kt
+++ b/src/test/kotlin/FieldTest.kt
@@ -1,14 +1,302 @@
 package solutions.bitbadger.documents
 
+import org.junit.jupiter.api.AfterEach
 import org.junit.jupiter.api.DisplayName
 import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.assertThrows
 import kotlin.test.assertEquals
+import kotlin.test.assertNotSame
 import kotlin.test.assertNull
 
 class FieldTest {
 
+    /**
+     * Clear the connection string (resets Dialect)
+     */
+    @AfterEach
+    fun cleanUp() {
+        Configuration.connectionString = null
+    }
+
+    // ~~~ INSTANCE METHODS ~~~
+
     @Test
-    @DisplayName("equal constructs a field")
+    @DisplayName("withParameterName fails for invalid name")
+    fun withParamNameFails() {
+        assertThrows<DocumentException> { Field.equal("it", "").withParameterName("2424") }
+    }
+
+    @Test
+    @DisplayName("withParameterName works with colon prefix")
+    fun withParamNameColon() {
+        val field = Field.equal("abc", "22").withQualifier("me")
+        val withParam = field.withParameterName(":test")
+        assertNotSame(field, withParam, "A new Field instance should have been created")
+        assertEquals(field.name, withParam.name, "Name should have been preserved")
+        assertEquals(field.comparison, withParam.comparison, "Comparison should have been preserved")
+        assertEquals(":test", withParam.parameterName, "Parameter name not set correctly")
+        assertEquals(field.qualifier, withParam.qualifier, "Qualifier should have been preserved")
+    }
+
+    @Test
+    @DisplayName("withParameterName works with at-sign prefix")
+    fun withParamNameAtSign() {
+        val field = Field.equal("def", "44")
+        val withParam = field.withParameterName("@unit")
+        assertNotSame(field, withParam, "A new Field instance should have been created")
+        assertEquals(field.name, withParam.name, "Name should have been preserved")
+        assertEquals(field.comparison, withParam.comparison, "Comparison should have been preserved")
+        assertEquals("@unit", withParam.parameterName, "Parameter name not set correctly")
+        assertEquals(field.qualifier, withParam.qualifier, "Qualifier should have been preserved")
+    }
+
+    @Test
+    @DisplayName("withQualifier sets qualifier correctly")
+    fun withQualifier() {
+        val field = Field.equal("j", "k")
+        val withQual = field.withQualifier("test")
+        assertNotSame(field, withQual, "A new Field instance should have been created")
+        assertEquals(field.name, withQual.name, "Name should have been preserved")
+        assertEquals(field.comparison, withQual.comparison, "Comparison should have been preserved")
+        assertEquals(field.parameterName, withQual.parameterName, "Parameter Name should have been preserved")
+        assertEquals("test", withQual.qualifier, "Qualifier not set correctly")
+    }
+
+    @Test
+    @DisplayName("path generates for simple unqualified PostgreSQL field")
+    fun pathPostgresSimpleUnqualified() =
+        assertEquals("data->>'SomethingCool'",
+            Field.greaterOrEqual("SomethingCool", 18).path(Dialect.POSTGRESQL, FieldFormat.SQL), "Path not correct")
+
+    @Test
+    @DisplayName("path generates for simple qualified PostgreSQL field")
+    fun pathPostgresSimpleQualified() =
+        assertEquals("this.data->>'SomethingElse'",
+            Field.less("SomethingElse", 9).withQualifier("this").path(Dialect.POSTGRESQL, FieldFormat.SQL),
+            "Path not correct")
+
+    @Test
+    @DisplayName("path generates for nested unqualified PostgreSQL field")
+    fun pathPostgresNestedUnqualified() {
+        assertEquals("data#>>'{My,Nested,Field}'",
+            Field.equal("My.Nested.Field", "howdy").path(Dialect.POSTGRESQL, FieldFormat.SQL), "Path not correct")
+    }
+
+    @Test
+    @DisplayName("path generates for nested qualified PostgreSQL field")
+    fun pathPostgresNestedQualified() =
+        assertEquals("bird.data#>>'{Nest,Away}'",
+            Field.equal("Nest.Away", "doc").withQualifier("bird").path(Dialect.POSTGRESQL, FieldFormat.SQL),
+            "Path not correct")
+
+    @Test
+    @DisplayName("path generates for simple unqualified SQLite field")
+    fun pathSQLiteSimpleUnqualified() =
+        assertEquals("data->>'SomethingCool'",
+            Field.greaterOrEqual("SomethingCool", 18).path(Dialect.SQLITE, FieldFormat.SQL), "Path not correct")
+
+    @Test
+    @DisplayName("path generates for simple qualified SQLite field")
+    fun pathSQLiteSimpleQualified() =
+        assertEquals("this.data->>'SomethingElse'",
+            Field.less("SomethingElse", 9).withQualifier("this").path(Dialect.SQLITE, FieldFormat.SQL),
+            "Path not correct")
+
+    @Test
+    @DisplayName("path generates for nested unqualified SQLite field")
+    fun pathSQLiteNestedUnqualified() =
+        assertEquals("data->'My'->'Nested'->>'Field'",
+            Field.equal("My.Nested.Field", "howdy").path(Dialect.SQLITE, FieldFormat.SQL), "Path not correct")
+
+    @Test
+    @DisplayName("path generates for nested qualified SQLite field")
+    fun pathSQLiteNestedQualified() =
+        assertEquals("bird.data->'Nest'->>'Away'",
+            Field.equal("Nest.Away", "doc").withQualifier("bird").path(Dialect.SQLITE, FieldFormat.SQL),
+            "Path not correct")
+
+    @Test
+    @DisplayName("toWhere generates for exists w/o qualifier (PostgreSQL)")
+    fun toWhereExistsNoQualPostgres() {
+        Configuration.connectionString = ":postgresql:"
+        assertEquals("data->>'that_field' IS NOT NULL", Field.exists("that_field").toWhere(),
+            "Field WHERE clause not generated correctly")
+    }
+
+    @Test
+    @DisplayName("toWhere generates for exists w/o qualifier (SQLite)")
+    fun toWhereExistsNoQualSQLite() {
+        Configuration.connectionString = ":sqlite:"
+        assertEquals("data->>'that_field' IS NOT NULL", Field.exists("that_field").toWhere(),
+            "Field WHERE clause not generated correctly")
+    }
+
+    @Test
+    @DisplayName("toWhere generates for not-exists w/o qualifier (PostgreSQL)")
+    fun toWhereNotExistsNoQualPostgres() {
+        Configuration.connectionString = ":postgresql:"
+        assertEquals("data->>'a_field' IS NULL", Field.notExists("a_field").toWhere(),
+            "Field WHERE clause not generated correctly")
+    }
+
+    @Test
+    @DisplayName("toWhere generates for not-exists w/o qualifier (SQLite)")
+    fun toWhereNotExistsNoQualSQLite() {
+        Configuration.connectionString = ":sqlite:"
+        assertEquals("data->>'a_field' IS NULL", Field.notExists("a_field").toWhere(),
+            "Field WHERE clause not generated correctly")
+    }
+
+    @Test
+    @DisplayName("toWhere generates for BETWEEN w/o qualifier, numeric range (PostgreSQL)")
+    fun toWhereBetweenNoQualNumericPostgres() {
+        Configuration.connectionString = ":postgresql:"
+        assertEquals("(data->>'age')::numeric BETWEEN @agemin AND @agemax",
+            Field.between("age", 13, 17, "@age").toWhere(), "Field WHERE clause not generated correctly")
+    }
+
+    @Test
+    @DisplayName("toWhere generates for BETWEEN w/o qualifier, alphanumeric range (PostgreSQL)")
+    fun toWhereBetweenNoQualAlphaPostgres() {
+        Configuration.connectionString = ":postgresql:"
+        assertEquals("data->>'city' BETWEEN :citymin AND :citymax",
+            Field.between("city", "Atlanta", "Chicago", ":city").toWhere(),
+            "Field WHERE clause not generated correctly")
+    }
+
+    @Test
+    @DisplayName("toWhere generates for BETWEEN w/o qualifier (SQLite)")
+    fun toWhereBetweenNoQualSQLite() {
+        Configuration.connectionString = ":sqlite:"
+        assertEquals("data->>'age' BETWEEN @agemin AND @agemax", Field.between("age", 13, 17, "@age").toWhere(),
+            "Field WHERE clause not generated correctly")
+    }
+
+    @Test
+    @DisplayName("toWhere generates for BETWEEN w/ qualifier, numeric range (PostgreSQL)")
+    fun toWhereBetweenQualNumericPostgres() {
+        Configuration.connectionString = ":postgresql:"
+        assertEquals("(test.data->>'age')::numeric BETWEEN @agemin AND @agemax",
+            Field.between("age", 13, 17, "@age").withQualifier("test").toWhere(),
+            "Field WHERE clause not generated correctly")
+    }
+
+    @Test
+    @DisplayName("toWhere generates for BETWEEN w/ qualifier, alphanumeric range (PostgreSQL)")
+    fun toWhereBetweenQualAlphaPostgres() {
+        Configuration.connectionString = ":postgresql:"
+        assertEquals("unit.data->>'city' BETWEEN :citymin AND :citymax",
+            Field.between("city", "Atlanta", "Chicago", ":city").withQualifier("unit").toWhere(),
+            "Field WHERE clause not generated correctly")
+    }
+
+    @Test
+    @DisplayName("toWhere generates for BETWEEN w/ qualifier (SQLite)")
+    fun toWhereBetweenQualSQLite() {
+        Configuration.connectionString = ":sqlite:"
+        assertEquals("my.data->>'age' BETWEEN @agemin AND @agemax",
+            Field.between("age", 13, 17, "@age").withQualifier("my").toWhere(),
+            "Field WHERE clause not generated correctly")
+    }
+
+    @Test
+    @DisplayName("toWhere generates for IN/any, numeric values (PostgreSQL)")
+    fun toWhereAnyNumericPostgres() {
+        Configuration.connectionString = ":postgresql:"
+        assertEquals("(data->>'even')::numeric IN (:nbr_0, :nbr_1, :nbr_2)",
+            Field.any("even", listOf(2, 4, 6), ":nbr").toWhere(), "Field WHERE clause not generated correctly")
+    }
+
+    @Test
+    @DisplayName("toWhere generates for IN/any, alphanumeric values (PostgreSQL)")
+    fun toWhereAnyAlphaPostgres() {
+        Configuration.connectionString = ":postgresql:"
+        assertEquals("data->>'test' IN (:city_0, :city_1)",
+            Field.any("test", listOf("Atlanta", "Chicago"), ":city").toWhere(),
+            "Field WHERE clause not generated correctly")
+    }
+
+    @Test
+    @DisplayName("toWhere generates for IN/any (SQLite)")
+    fun toWhereAnySQLite() {
+        Configuration.connectionString = ":sqlite:"
+        assertEquals("data->>'test' IN (:city_0, :city_1)",
+            Field.any("test", listOf("Atlanta", "Chicago"), ":city").toWhere(),
+            "Field WHERE clause not generated correctly")
+    }
+
+    @Test
+    @DisplayName("toWhere generates for inArray (PostgreSQL)")
+    fun toWhereInArrayPostgres() {
+        Configuration.connectionString = ":postgresql:"
+        assertEquals("data->'even' ?| ARRAY[:it_0, :it_1, :it_2, :it_3]",
+            Field.inArray("even", "tbl", listOf(2, 4, 6, 8), ":it").toWhere(),
+            "Field WHERE clause not generated correctly")
+    }
+
+    @Test
+    @DisplayName("toWhere generates for inArray (SQLite)")
+    fun toWhereInArraySQLite() {
+        Configuration.connectionString = ":sqlite:"
+        assertEquals("EXISTS (SELECT 1 FROM json_each(tbl.data, '$.test') WHERE value IN (:city_0, :city_1))",
+            Field.inArray("test", "tbl", listOf("Atlanta", "Chicago"), ":city").toWhere(),
+            "Field WHERE clause not generated correctly")
+    }
+
+    @Test
+    @DisplayName("toWhere generates for others w/o qualifier (PostgreSQL)")
+    fun toWhereOtherNoQualPostgres() {
+        Configuration.connectionString = ":postgresql:"
+        assertEquals("data->>'some_field' = :value", Field.equal("some_field", "", ":value").toWhere(),
+            "Field WHERE clause not generated correctly")
+    }
+
+    @Test
+    @DisplayName("toWhere generates for others w/o qualifier (SQLite)")
+    fun toWhereOtherNoQualSQLite() {
+        Configuration.connectionString = ":sqlite:"
+        assertEquals("data->>'some_field' = :value", Field.equal("some_field", "", ":value").toWhere(),
+            "Field WHERE clause not generated correctly")
+    }
+
+    @Test
+    @DisplayName("toWhere generates no-parameter w/ qualifier (PostgreSQL)")
+    fun toWhereNoParamWithQualPostgres() {
+        Configuration.connectionString = ":postgresql:"
+        assertEquals("test.data->>'no_field' IS NOT NULL", Field.exists("no_field").withQualifier("test").toWhere(),
+            "Field WHERE clause not generated correctly")
+    }
+
+    @Test
+    @DisplayName("toWhere generates no-parameter w/ qualifier (SQLite)")
+    fun toWhereNoParamWithQualSQLite() {
+        Configuration.connectionString = ":sqlite:"
+        assertEquals("test.data->>'no_field' IS NOT NULL", Field.exists("no_field").withQualifier("test").toWhere(),
+            "Field WHERE clause not generated correctly")
+    }
+
+    @Test
+    @DisplayName("toWhere generates parameter w/ qualifier (PostgreSQL)")
+    fun toWhereParamWithQualPostgres() {
+        Configuration.connectionString = ":postgresql:"
+        assertEquals("(q.data->>'le_field')::numeric <= :it",
+            Field.lessOrEqual("le_field", 18, ":it").withQualifier("q").toWhere(),
+            "Field WHERE clause not generated correctly")
+    }
+
+    @Test
+    @DisplayName("toWhere generates parameter w/ qualifier (SQLite)")
+    fun toWhereParamWithQualSQLite() {
+        Configuration.connectionString = ":sqlite:"
+        assertEquals("q.data->>'le_field' <= :it",
+            Field.lessOrEqual("le_field", 18, ":it").withQualifier("q").toWhere(),
+            "Field WHERE clause not generated correctly")
+    }
+
+    // ~~~ COMPANION OBJECT TESTS ~~~
+
+    @Test
+    @DisplayName("equal constructs a field w/o parameter name")
     fun equalCtor() {
         val field = Field.equal("Test", 14)
         assertEquals("Test", field.name, "Field name not filled correctly")
@@ -19,7 +307,18 @@ class FieldTest {
     }
 
     @Test
-    @DisplayName("greater constructs a field")
+    @DisplayName("equal constructs a field w/ parameter name")
+    fun equalParameterCtor() {
+        val field = Field.equal("Test", 14, ":w")
+        assertEquals("Test", field.name, "Field name not filled correctly")
+        assertEquals(Op.EQUAL, field.comparison.op, "Field comparison operation not filled correctly")
+        assertEquals(14, field.comparison.value, "Field comparison value not filled correctly")
+        assertEquals(":w", field.parameterName, "Field parameter name not filled correctly")
+        assertNull(field.qualifier, "The qualifier should have been null")
+    }
+
+    @Test
+    @DisplayName("greater constructs a field w/o parameter name")
     fun greaterCtor() {
         val field = Field.greater("Great", "night")
         assertEquals("Great", field.name, "Field name not filled correctly")
@@ -30,7 +329,18 @@ class FieldTest {
     }
 
     @Test
-    @DisplayName("greaterOrEqual constructs a field")
+    @DisplayName("greater constructs a field w/ parameter name")
+    fun greaterParameterCtor() {
+        val field = Field.greater("Great", "night", ":yeah")
+        assertEquals("Great", field.name, "Field name not filled correctly")
+        assertEquals(Op.GREATER, field.comparison.op, "Field comparison operation not filled correctly")
+        assertEquals("night", field.comparison.value, "Field comparison value not filled correctly")
+        assertEquals(":yeah", field.parameterName, "Field parameter name not filled correctly")
+        assertNull(field.qualifier, "The qualifier should have been null")
+    }
+
+    @Test
+    @DisplayName("greaterOrEqual constructs a field w/o parameter name")
     fun greaterOrEqualCtor() {
         val field = Field.greaterOrEqual("Nice", 88L)
         assertEquals("Nice", field.name, "Field name not filled correctly")
@@ -41,7 +351,18 @@ class FieldTest {
     }
 
     @Test
-    @DisplayName("less constructs a field")
+    @DisplayName("greaterOrEqual constructs a field w/ parameter name")
+    fun greaterOrEqualParameterCtor() {
+        val field = Field.greaterOrEqual("Nice", 88L, ":nice")
+        assertEquals("Nice", field.name, "Field name not filled correctly")
+        assertEquals(Op.GREATER_OR_EQUAL, field.comparison.op, "Field comparison operation not filled correctly")
+        assertEquals(88L, field.comparison.value, "Field comparison value not filled correctly")
+        assertEquals(":nice", field.parameterName, "Field parameter name not filled correctly")
+        assertNull(field.qualifier, "The qualifier should have been null")
+    }
+
+    @Test
+    @DisplayName("less constructs a field w/o parameter name")
     fun lessCtor() {
         val field = Field.less("Lesser", "seven")
         assertEquals("Lesser", field.name, "Field name not filled correctly")
@@ -52,7 +373,18 @@ class FieldTest {
     }
 
     @Test
-    @DisplayName("lessOrEqual constructs a field")
+    @DisplayName("less constructs a field w/ parameter name")
+    fun lessParameterCtor() {
+        val field = Field.less("Lesser", "seven", ":max")
+        assertEquals("Lesser", field.name, "Field name not filled correctly")
+        assertEquals(Op.LESS, field.comparison.op, "Field comparison operation not filled correctly")
+        assertEquals("seven", field.comparison.value, "Field comparison value not filled correctly")
+        assertEquals(":max", field.parameterName, "Field parameter name not filled correctly")
+        assertNull(field.qualifier, "The qualifier should have been null")
+    }
+
+    @Test
+    @DisplayName("lessOrEqual constructs a field w/o parameter name")
     fun lessOrEqualCtor() {
         val field = Field.lessOrEqual("Nobody", "KNOWS")
         assertEquals("Nobody", field.name, "Field name not filled correctly")
@@ -63,7 +395,18 @@ class FieldTest {
     }
 
     @Test
-    @DisplayName("notEqual constructs a field")
+    @DisplayName("lessOrEqual constructs a field w/ parameter name")
+    fun lessOrEqualParameterCtor() {
+        val field = Field.lessOrEqual("Nobody", "KNOWS", ":nope")
+        assertEquals("Nobody", field.name, "Field name not filled correctly")
+        assertEquals(Op.LESS_OR_EQUAL, field.comparison.op, "Field comparison operation not filled correctly")
+        assertEquals("KNOWS", field.comparison.value, "Field comparison value not filled correctly")
+        assertEquals(":nope", field.parameterName, "Field parameter name not filled correctly")
+        assertNull(field.qualifier, "The qualifier should have been null")
+    }
+
+    @Test
+    @DisplayName("notEqual constructs a field w/o parameter name")
     fun notEqualCtor() {
         val field = Field.notEqual("Park", "here")
         assertEquals("Park", field.name, "Field name not filled correctly")
@@ -74,7 +417,18 @@ class FieldTest {
     }
 
     @Test
-    @DisplayName("between constructs a field")
+    @DisplayName("notEqual constructs a field w/ parameter name")
+    fun notEqualParameterCtor() {
+        val field = Field.notEqual("Park", "here", ":now")
+        assertEquals("Park", field.name, "Field name not filled correctly")
+        assertEquals(Op.NOT_EQUAL, field.comparison.op, "Field comparison operation not filled correctly")
+        assertEquals("here", field.comparison.value, "Field comparison value not filled correctly")
+        assertEquals(":now", field.parameterName, "Field parameter name not filled correctly")
+        assertNull(field.qualifier, "The qualifier should have been null")
+    }
+
+    @Test
+    @DisplayName("between constructs a field w/o parameter name")
     fun betweenCtor() {
         val field = Field.between("Age", 18, 49)
         assertEquals("Age", field.name, "Field name not filled correctly")
@@ -86,8 +440,20 @@ class FieldTest {
     }
 
     @Test
-    @DisplayName("any constructs a field")
-    fun inCtor() {
+    @DisplayName("between constructs a field w/ parameter name")
+    fun betweenParameterCtor() {
+        val field = Field.between("Age", 18, 49, ":limit")
+        assertEquals("Age", field.name, "Field name not filled correctly")
+        assertEquals(Op.BETWEEN, field.comparison.op, "Field comparison operation not filled correctly")
+        assertEquals(18, field.comparison.value.first, "Field comparison min value not filled correctly")
+        assertEquals(49, field.comparison.value.second, "Field comparison max value not filled correctly")
+        assertEquals(":limit", field.parameterName, "The parameter name should have been null")
+        assertNull(field.qualifier, "The qualifier should have been null")
+    }
+
+    @Test
+    @DisplayName("any constructs a field w/o parameter name")
+    fun anyCtor() {
         val field = Field.any("Here", listOf(8, 16, 32))
         assertEquals("Here", field.name, "Field name not filled correctly")
         assertEquals(Op.IN, field.comparison.op, "Field comparison operation not filled correctly")
@@ -97,7 +463,18 @@ class FieldTest {
     }
 
     @Test
-    @DisplayName("inArray constructs a field")
+    @DisplayName("any constructs a field w/ parameter name")
+    fun anyParameterCtor() {
+        val field = Field.any("Here", listOf(8, 16, 32), ":list")
+        assertEquals("Here", field.name, "Field name not filled correctly")
+        assertEquals(Op.IN, field.comparison.op, "Field comparison operation not filled correctly")
+        assertEquals(listOf(8, 16, 32), field.comparison.value, "Field comparison value not filled correctly")
+        assertEquals(":list", field.parameterName, "Field parameter name not filled correctly")
+        assertNull(field.qualifier, "The qualifier should have been null")
+    }
+
+    @Test
+    @DisplayName("inArray constructs a field w/o parameter name")
     fun inArrayCtor() {
         val field = Field.inArray("ArrayField", "table", listOf("z"))
         assertEquals("ArrayField", field.name, "Field name not filled correctly")
@@ -108,6 +485,18 @@ class FieldTest {
         assertNull(field.qualifier, "The qualifier should have been null")
     }
 
+    @Test
+    @DisplayName("inArray constructs a field w/ parameter name")
+    fun inArrayParameterCtor() {
+        val field = Field.inArray("ArrayField", "table", listOf("z"), ":a")
+        assertEquals("ArrayField", field.name, "Field name not filled correctly")
+        assertEquals(Op.IN_ARRAY, field.comparison.op, "Field comparison operation not filled correctly")
+        assertEquals("table", field.comparison.value.first, "Field comparison table not filled correctly")
+        assertEquals(listOf("z"), field.comparison.value.second, "Field comparison values not filled correctly")
+        assertEquals(":a", field.parameterName, "Field parameter name not filled correctly")
+        assertNull(field.qualifier, "The qualifier should have been null")
+    }
+
     @Test
     @DisplayName("exists constructs a field")
     fun existsCtor() {
@@ -143,135 +532,53 @@ class FieldTest {
 
     @Test
     @DisplayName("nameToPath creates a simple PostgreSQL SQL name")
-    fun nameToPathPostgresSimpleSQL() {
+    fun nameToPathPostgresSimpleSQL() =
         assertEquals("data->>'Simple'", Field.nameToPath("Simple", Dialect.POSTGRESQL, FieldFormat.SQL),
             "Path not constructed correctly")
-    }
 
     @Test
     @DisplayName("nameToPath creates a simple SQLite SQL name")
-    fun nameToPathSQLiteSimpleSQL() {
+    fun nameToPathSQLiteSimpleSQL() =
         assertEquals("data->>'Simple'", Field.nameToPath("Simple", Dialect.SQLITE, FieldFormat.SQL),
             "Path not constructed correctly")
-    }
 
     @Test
     @DisplayName("nameToPath creates a nested PostgreSQL SQL name")
-    fun nameToPathPostgresNestedSQL() {
+    fun nameToPathPostgresNestedSQL() =
         assertEquals("data#>>'{A,Long,Path,to,the,Property}'",
             Field.nameToPath("A.Long.Path.to.the.Property", Dialect.POSTGRESQL, FieldFormat.SQL),
             "Path not constructed correctly")
-    }
 
     @Test
     @DisplayName("nameToPath creates a nested SQLite SQL name")
-    fun nameToPathSQLiteNestedSQL() {
+    fun nameToPathSQLiteNestedSQL() =
         assertEquals("data->'A'->'Long'->'Path'->'to'->'the'->>'Property'",
             Field.nameToPath("A.Long.Path.to.the.Property", Dialect.SQLITE, FieldFormat.SQL),
             "Path not constructed correctly")
-    }
 
     @Test
     @DisplayName("nameToPath creates a simple PostgreSQL JSON name")
-    fun nameToPathPostgresSimpleJSON() {
+    fun nameToPathPostgresSimpleJSON() =
         assertEquals("data->'Simple'", Field.nameToPath("Simple", Dialect.POSTGRESQL, FieldFormat.JSON),
             "Path not constructed correctly")
-    }
 
     @Test
     @DisplayName("nameToPath creates a simple SQLite JSON name")
-    fun nameToPathSQLiteSimpleJSON() {
+    fun nameToPathSQLiteSimpleJSON() =
         assertEquals("data->'Simple'", Field.nameToPath("Simple", Dialect.SQLITE, FieldFormat.JSON),
             "Path not constructed correctly")
-    }
 
     @Test
     @DisplayName("nameToPath creates a nested PostgreSQL JSON name")
-    fun nameToPathPostgresNestedJSON() {
+    fun nameToPathPostgresNestedJSON() =
         assertEquals("data#>'{A,Long,Path,to,the,Property}'",
             Field.nameToPath("A.Long.Path.to.the.Property", Dialect.POSTGRESQL, FieldFormat.JSON),
             "Path not constructed correctly")
-    }
 
     @Test
     @DisplayName("nameToPath creates a nested SQLite JSON name")
-    fun nameToPathSQLiteNestedJSON() {
+    fun nameToPathSQLiteNestedJSON() =
         assertEquals("data->'A'->'Long'->'Path'->'to'->'the'->'Property'",
             Field.nameToPath("A.Long.Path.to.the.Property", Dialect.SQLITE, FieldFormat.JSON),
             "Path not constructed correctly")
-    }
-
-    @Test
-    @DisplayName("withParameterName adjusts the parameter name")
-    fun withParameterName() {
-        assertEquals(":name", Field.equal("Bob", "Tom").withParameterName(":name").parameterName,
-            "Parameter name not filled correctly")
-    }
-
-    @Test
-    @DisplayName("withQualifier adjust the table qualifier")
-    fun withQualifier() {
-        assertEquals("joe", Field.equal("Bill", "Matt").withQualifier("joe").qualifier,
-            "Qualifier not filled correctly")
-    }
-
-    @Test
-    @DisplayName("path generates for simple unqualified PostgreSQL field")
-    fun pathPostgresSimpleUnqualified() {
-        assertEquals("data->>'SomethingCool'",
-            Field.greaterOrEqual("SomethingCool", 18).path(Dialect.POSTGRESQL, FieldFormat.SQL), "Path not correct")
-    }
-
-    @Test
-    @DisplayName("path generates for simple qualified PostgreSQL field")
-    fun pathPostgresSimpleQualified() {
-        assertEquals("this.data->>'SomethingElse'",
-            Field.less("SomethingElse", 9).withQualifier("this").path(Dialect.POSTGRESQL, FieldFormat.SQL),
-            "Path not correct")
-    }
-
-    @Test
-    @DisplayName("path generates for nested unqualified PostgreSQL field")
-    fun pathPostgresNestedUnqualified() {
-        assertEquals("data#>>'{My,Nested,Field}'",
-            Field.equal("My.Nested.Field", "howdy").path(Dialect.POSTGRESQL, FieldFormat.SQL), "Path not correct")
-    }
-
-    @Test
-    @DisplayName("path generates for nested qualified PostgreSQL field")
-    fun pathPostgresNestedQualified() {
-        assertEquals("bird.data#>>'{Nest,Away}'",
-            Field.equal("Nest.Away", "doc").withQualifier("bird").path(Dialect.POSTGRESQL, FieldFormat.SQL),
-            "Path not correct")
-    }
-
-    @Test
-    @DisplayName("path generates for simple unqualified SQLite field")
-    fun pathSQLiteSimpleUnqualified() {
-        assertEquals("data->>'SomethingCool'",
-            Field.greaterOrEqual("SomethingCool", 18).path(Dialect.SQLITE, FieldFormat.SQL), "Path not correct")
-    }
-
-    @Test
-    @DisplayName("path generates for simple qualified SQLite field")
-    fun pathSQLiteSimpleQualified() {
-        assertEquals("this.data->>'SomethingElse'",
-            Field.less("SomethingElse", 9).withQualifier("this").path(Dialect.SQLITE, FieldFormat.SQL),
-            "Path not correct")
-    }
-
-    @Test
-    @DisplayName("path generates for nested unqualified SQLite field")
-    fun pathSQLiteNestedUnqualified() {
-        assertEquals("data->'My'->'Nested'->>'Field'",
-            Field.equal("My.Nested.Field", "howdy").path(Dialect.SQLITE, FieldFormat.SQL), "Path not correct")
-    }
-
-    @Test
-    @DisplayName("path generates for nested qualified SQLite field")
-    fun pathSQLiteNestedQualified() {
-        assertEquals("bird.data->'Nest'->>'Away'",
-            Field.equal("Nest.Away", "doc").withQualifier("bird").path(Dialect.SQLITE, FieldFormat.SQL),
-            "Path not correct")
-    }
 }
diff --git a/src/test/kotlin/QueryTest.kt b/src/test/kotlin/QueryTest.kt
index 3799154..16de55a 100644
--- a/src/test/kotlin/QueryTest.kt
+++ b/src/test/kotlin/QueryTest.kt
@@ -1,5 +1,6 @@
 package solutions.bitbadger.documents
 
+import org.junit.jupiter.api.AfterEach
 import org.junit.jupiter.api.DisplayName
 import org.junit.jupiter.api.Test
 import kotlin.test.assertEquals
@@ -9,6 +10,14 @@ class QueryTest {
     /** Test table name */
     private val tbl = "test_table"
 
+    /**
+     * Clear the connection string (resets Dialect)
+     */
+    @AfterEach
+    fun cleanUp() {
+        Configuration.connectionString = null
+    }
+
     @Test
     @DisplayName("statementWhere generates correctly")
     fun statementWhere() {
@@ -67,30 +76,17 @@ class QueryTest {
     @Test
     @DisplayName("insert generates correctly")
     fun insert() {
-        try {
-            Configuration.connectionString = "postgresql"
-            assertEquals(
-                "INSERT INTO $tbl VALUES (:data)",
-                Query.insert(tbl),
-                "INSERT statement not constructed correctly"
-            )
-        } finally {
-            Configuration.connectionString = null
-        }
+        Configuration.connectionString = ":postgresql:"
+        assertEquals("INSERT INTO $tbl VALUES (:data)", Query.insert(tbl), "INSERT statement not constructed correctly")
     }
 
     @Test
     @DisplayName("save generates correctly")
     fun save() {
-        try {
-            Configuration.connectionString = "postgresql"
-            assertEquals(
-                "INSERT INTO $tbl VALUES (:data) ON CONFLICT ((data->>'id')) DO UPDATE SET data = EXCLUDED.data",
-                Query.save(tbl), "INSERT ON CONFLICT UPDATE statement not constructed correctly"
-            )
-        } finally {
-            Configuration.connectionString = null
-        }
+        Configuration.connectionString = ":postgresql:"
+        assertEquals(
+            "INSERT INTO $tbl VALUES (:data) ON CONFLICT ((data->>'id')) DO UPDATE SET data = EXCLUDED.data",
+            Query.save(tbl), "INSERT ON CONFLICT UPDATE statement not constructed correctly")
     }
 
     @Test