Add the null-values unit tests

Author: qiaoyuang

sqllin-dsl/src/androidInstrumentedTest/kotlin/com/ctrip/sqllin/dsl/AndroidTest.kt

@@ -74,6 +74,9 @@ class AndroidTest {
     @Test
     fun testPrimitiveTypeForKSP() = commonTest.testPrimitiveTypeForKSP()
 
+    @Test
+    fun testNullInsertAndSelect() = commonTest.testNullInsertAndSelect()
+
     @Before
     fun setUp() {
         val context = InstrumentationRegistry.getInstrumentation().targetContext

sqllin-dsl/src/commonMain/kotlin/com/ctrip/sqllin/dsl/sql/compiler/AbstractValuesEncoder.kt

@@ -17,7 +17,6 @@
 package com.ctrip.sqllin.dsl.sql.compiler
 
 import kotlinx.serialization.ExperimentalSerializationApi
-import kotlinx.serialization.SerializationStrategy
 import kotlinx.serialization.descriptors.SerialDescriptor
 import kotlinx.serialization.encoding.AbstractEncoder
 import kotlinx.serialization.modules.EmptySerializersModule
@@ -83,18 +82,8 @@ internal abstract class AbstractValuesEncoder : AbstractEncoder() {
         sqlStrBuilder.append(value).appendTail()
     }
 
-    override fun <T : Any> encodeNullableSerializableElement(
-        descriptor: SerialDescriptor,
-        index: Int,
-        serializer: SerializationStrategy<T>,
-        value: T?
-    ) {
-        if (value == null) {
-            elementsCount = descriptor.elementsCount
-            elementsIndex = index
-            sqlStrBuilder.append("NULL").appendTail()
-        } else
-            super.encodeNullableSerializableElement(descriptor, index, serializer, value)
+    override fun encodeNull() {
+        sqlStrBuilder.append("NULL").appendTail()
     }
 
     override fun encodeEnum(enumDescriptor: SerialDescriptor, index: Int) = encodeInt(index)

sqllin-dsl/src/commonTest/kotlin/com/ctrip/sqllin/dsl/CommonBasicTest.kt

@@ -40,6 +40,7 @@ class CommonBasicTest(private val path: DatabasePath) {
         const val DATABASE_NAME = "BookStore.db"
         const val SQL_CREATE_BOOK = "create table book (id integer primary key autoincrement, name text, author text, pages integer, price real)"
         const val SQL_CREATE_CATEGORY = "create table category (id integer primary key autoincrement, name text, code integer)"
+        const val SQL_CREATE_NULL_TESTER = "create table NullTester (id integer primary key autoincrement, paramInt integer, paramString text, paramDouble real)"
     }
 
     private inline fun Database.databaseAutoClose(block: (Database) -> Unit) = try {
@@ -427,6 +428,30 @@ class CommonBasicTest(private val path: DatabasePath) {
         }
     }
 
+    fun testNullInsertAndSelect() {
+        val config = DatabaseConfiguration(
+            name = DATABASE_NAME,
+            path = path,
+            version = 1,
+            create = {
+                it.execSQL(SQL_CREATE_NULL_TESTER)
+            }
+        )
+        Database(config, true).databaseAutoClose { database ->
+            lateinit var selectStatement: SelectStatement<NullTester>
+            database {
+                NullTesterTable { table ->
+                    table INSERT listOf(
+                        NullTester(null, null, null),
+                        NullTester(8, "888", 8.8),
+                    )
+                    selectStatement = table SELECT X
+                }
+            }
+            assertEquals(2, selectStatement.getResults().size)
+        }
+    }
+
     private fun getDefaultDBConfig(): DatabaseConfiguration =
         DatabaseConfiguration(
             name = DATABASE_NAME,

sqllin-dsl/src/commonTest/kotlin/com/ctrip/sqllin/dsl/Entities.kt

@@ -42,17 +42,25 @@ data class Category(
 
 @Serializable
 data class Joiner(
-    val name: String,
-    val author: String,
-    val price: Double,
-    val pages: Int,
-    val code: Int,
+    val name: String?,
+    val author: String?,
+    val price: Double?,
+    val pages: Int?,
+    val code: Int?,
 )
 
 @Serializable
 data class CrossJoiner(
-    val author: String,
-    val price: Double,
-    val pages: Int,
-    val code: Int,
+    val author: String?,
+    val price: Double?,
+    val pages: Int?,
+    val code: Int?,
+)
+
+@DBRow("NullTester")
+@Serializable
+data class NullTester(
+    val paramInt: Int?,
+    val paramString: String?,
+    val paramDouble: Double?,
 )

sqllin-dsl/src/jvmTest/kotlin/com/ctrip/sqllin/dsl/JvmTest.kt

@@ -65,6 +65,9 @@ class JvmTest {
     @Test
     fun testPrimitiveTypeForKSP() = commonTest.testPrimitiveTypeForKSP()
 
+    @Test
+    fun testNullInsertAndSelect() = commonTest.testNullInsertAndSelect()
+
     @BeforeTest
     fun setUp() {
         deleteDatabase(path, CommonBasicTest.DATABASE_NAME)

sqllin-dsl/src/nativeTest/kotlin/com/ctrip/sqllin/dsl/NativeTest.kt

@@ -68,6 +68,9 @@ class NativeTest {
     @Test
     fun testPrimitiveTypeForKSP() = commonTest.testPrimitiveTypeForKSP()
 
+    @Test
+    fun testNullInsertAndSelect() = commonTest.testNullInsertAndSelect()
+
     @BeforeTest
     fun setUp() {
         deleteDatabase(path, CommonBasicTest.DATABASE_NAME)