Fixed nullable plain params

src/main/kotlin/io/tcds/orm/Param.kt

@@ -7,6 +7,6 @@ interface Param<T> {
     val value: T
 
     fun bind(stmt: PreparedStatement, index: Int)
-    fun plain(): Any = value as Any
+    fun plain(): Any? = value
     fun describe(): String = "$name=$value"
 }

src/main/kotlin/io/tcds/orm/param/BooleanParam.kt

@@ -7,6 +7,5 @@ data class BooleanParam(
     override val name: String,
     override val value: Boolean,
 ) : Param<Boolean> {
-    override fun plain(): Boolean = value
     override fun bind(stmt: PreparedStatement, index: Int) = stmt.setBoolean(index, value)
 }

src/main/kotlin/io/tcds/orm/param/ColumnParam.kt

@@ -9,6 +9,5 @@ data class ColumnParam<Entry, Type>(
     override val value: Type,
 ) : Param<Type> {
     override val name: String = column.name
-    override fun plain(): Any = value as Any
     override fun bind(stmt: PreparedStatement, index: Int) = column.bind(stmt, index, value)
 }

src/main/kotlin/io/tcds/orm/param/DoubleParam.kt

@@ -7,6 +7,5 @@ data class DoubleParam(
     override val name: String,
     override val value: Double,
 ) : Param<Double> {
-    override fun plain(): Double = value
     override fun bind(stmt: PreparedStatement, index: Int) = stmt.setDouble(index, value)
 }

src/main/kotlin/io/tcds/orm/param/FloatParam.kt

@@ -7,6 +7,5 @@ data class FloatParam(
     override val name: String,
     override val value: Float,
 ) : Param<Float> {
-    override fun plain(): Float = value
     override fun bind(stmt: PreparedStatement, index: Int) = stmt.setFloat(index, value)
 }

src/main/kotlin/io/tcds/orm/param/IntegerParam.kt

@@ -7,6 +7,5 @@ data class IntegerParam(
     override val name: String,
     override val value: Int,
 ) : Param<Int> {
-    override fun plain(): Int = value
     override fun bind(stmt: PreparedStatement, index: Int) = stmt.setInt(index, value)
 }

src/main/kotlin/io/tcds/orm/param/LongParam.kt

@@ -7,6 +7,5 @@ data class LongParam(
     override val name: String,
     override val value: Long,
 ) : Param<Long> {
-    override fun plain(): Long = value
     override fun bind(stmt: PreparedStatement, index: Int) = stmt.setLong(index, value)
 }

src/main/kotlin/io/tcds/orm/param/StringParam.kt

@@ -7,6 +7,5 @@ data class StringParam(
     override val name: String,
     override val value: String,
 ) : Param<String> {
-    override fun plain(): String = value
     override fun bind(stmt: PreparedStatement, index: Int) = stmt.setString(index, value)
 }

src/main/kotlin/io/tcds/orm/param/nullable/NullableEnumParam.kt

@@ -8,6 +8,7 @@ data class NullableEnumParam<T : Enum<*>>(
     override val name: String,
     override val value: T?,
 ) : Param<T?> {
+    override fun plain(): Any? = value?.name
     override fun bind(stmt: PreparedStatement, index: Int) = when (value) {
         null -> stmt.setNull(index, Types.VARCHAR)
         else -> stmt.setString(index, value.name)

src/main/kotlin/io/tcds/orm/param/nullable/NullableInstantParam.kt

@@ -10,6 +10,7 @@ data class NullableInstantParam(
     override val name: String,
     override val value: Instant?,
 ) : Param<Instant?> {
+    override fun plain(): String? = value?.toString()
     override fun bind(stmt: PreparedStatement, index: Int) = when (value) {
         null -> stmt.setNull(index, Types.TIMESTAMP)
         else -> stmt.setTimestamp(index, Timestamp.from(value))

src/main/kotlin/io/tcds/orm/param/nullable/NullableJsonParam.kt

@@ -9,6 +9,7 @@ data class NullableJsonParam<T>(
     override val name: String,
     override val value: T?,
 ) : Param<T?> {
+    override fun plain(): String? = value?.let { JsonParam.mapper.writeValueAsString(it) }
     override fun bind(stmt: PreparedStatement, index: Int) = when (value) {
         null -> stmt.setNull(index, Types.VARCHAR)
         else -> stmt.setString(index, JsonParam.mapper.writeValueAsString(value))