Add Kotlin utility functions for Spring RowMapper SAM conversions

src/main/kotlin/org/mybatis/dynamic/sql/util/kotlin/spring/NamedParameterJdbcTemplateExtensions.kt

@@ -37,6 +37,7 @@ import org.mybatis.dynamic.sql.util.kotlin.MyBatisDslMarker
 import org.mybatis.dynamic.sql.util.kotlin.SelectCompleter
 import org.mybatis.dynamic.sql.util.kotlin.UpdateCompleter
 import org.springframework.dao.EmptyResultDataAccessException
+import org.springframework.jdbc.core.RowMapper
 import org.springframework.jdbc.core.namedparam.BeanPropertySqlParameterSource
 import org.springframework.jdbc.core.namedparam.MapSqlParameterSource
 import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate
@@ -193,6 +194,11 @@ fun NamedParameterJdbcTemplate.selectDistinct(
 fun <T> NamedParameterJdbcTemplate.selectList(
     selectStatement: SelectStatementProvider,
     rowMapper: (rs: ResultSet, rowNum: Int) -> T
+): List<T> = selectList(selectStatement, RowMapper(rowMapper))
+
+fun <T> NamedParameterJdbcTemplate.selectList(
+    selectStatement: SelectStatementProvider,
+    rowMapper: RowMapper<T>
 ): List<T> =
     query(selectStatement.selectStatement, selectStatement.parameters, rowMapper)
 
@@ -217,10 +223,15 @@ fun NamedParameterJdbcTemplate.selectOne(
         this
     )
 
-@SuppressWarnings("SwallowedException")
 fun <T> NamedParameterJdbcTemplate.selectOne(
     selectStatement: SelectStatementProvider,
     rowMapper: (rs: ResultSet, rowNum: Int) -> T
+): T? = selectOne(selectStatement, RowMapper(rowMapper))
+
+@SuppressWarnings("SwallowedException")
+fun <T> NamedParameterJdbcTemplate.selectOne(
+    selectStatement: SelectStatementProvider,
+    rowMapper: RowMapper<T>
 ): T? = try {
     queryForObject(selectStatement.selectStatement, selectStatement.parameters, rowMapper)
 } catch (e: EmptyResultDataAccessException) {
@@ -251,6 +262,9 @@ class SelectListMapperGatherer(
 ) {
     fun <T> withRowMapper(rowMapper: (rs: ResultSet, rowNum: Int) -> T): List<T> =
         template.selectList(selectStatement, rowMapper)
+
+    fun <T> withRowMapper(rowMapper: RowMapper<T>): List<T> =
+        template.selectList(selectStatement, rowMapper)
 }
 
 @MyBatisDslMarker
@@ -260,6 +274,9 @@ class SelectOneMapperGatherer(
 ) {
     fun <T> withRowMapper(rowMapper: (rs: ResultSet, rowNum: Int) -> T): T? =
         template.selectOne(selectStatement, rowMapper)
+
+    fun <T> withRowMapper(rowMapper: RowMapper<T>): T? =
+        template.selectOne(selectStatement, rowMapper)
 }
 
 @MyBatisDslMarker

src/test/kotlin/examples/kotlin/spring/canonical/CanonicalSpringKotlinTemplateDirectTest.kt

@@ -621,12 +621,10 @@ open class CanonicalSpringKotlinTemplateDirectTest {
 
     @Test
     fun testAutoMapping() {
-        val rm = DataClassRowMapper.newInstance(AddressRecord::class.java)
-
         val rows = template.select(address.id.`as`("id"), address.streetAddress, address.city, address.state) {
             from(address)
             orderBy(address.id)
-        }.withRowMapper(rm::mapRow)
+        }.withRowMapper(DataClassRowMapper(AddressRecord::class.java))
 
         assertThat(rows).hasSize(2)
         with(rows[0]) {
@@ -637,6 +635,23 @@ open class CanonicalSpringKotlinTemplateDirectTest {
         }
     }
 
+    @Test
+    fun testAutoMappingOneRow() {
+        val row = template.selectOne(address.id.`as`("id"), address.streetAddress, address.city, address.state) {
+            from(address)
+            where { address.id isEqualTo 1 }
+            orderBy(address.id)
+        }.withRowMapper(DataClassRowMapper(AddressRecord::class.java))
+
+        assertThat(row).isNotNull
+        with(row!!) {
+            assertThat(id).isEqualTo(1)
+            assertThat(streetAddress).isEqualTo("123 Main Street")
+            assertThat(city).isEqualTo("Bedrock")
+            assertThat(state).isEqualTo("IN")
+        }
+    }
+
     @Test
     fun testSelectWithJoin() {
         val rows = template.select(