Add getColumn* operators.

spring-data-r2dbc/src/main/kotlin/org/springframework/data/r2dbc/RowExtensions.kt

@@ -0,0 +1,64 @@
+/*
+ * Copyright 2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.data.r2dbc
+
+import io.r2dbc.spi.Row
+
+/**
+ * Extensions for [Row].
+ *
+ * @author George Papadopoulos
+ */
+
+/**
+ * Returns the value at the specified [column][name] in the resulting [Row].
+ * You can use [Any] as `T` to allow the implementation to make the loosest possible match.
+ *
+ * See [getColumnNullable] when column contains `nullable` values.
+ *
+ * @throws IllegalStateException when column contains a `null` value.
+ * @throws NoSuchElementException if the [name] is not a know readable column.
+ */
+inline fun <reified T : Any> Row.getColumn(name: String): T =
+ getColumnNullable(name) ?: error("There is a null value inside column:$name.")
+
+/**
+ * Returns the value at the specified [column][name] in the resulting [Row]. The value can be `null`.
+ * You can use [Any] as `T` to allow the implementation to make the loosest possible match.
+ *
+ * @throws NoSuchElementException if the [name] is not a know readable column.
+ */
+inline fun <reified T : Any> Row.getColumnNullable(name: String): T? = this[name, T::class.java]
+
+/**
+ * Returns the value at the specified [column-index][index] in the resulting [Row].
+ * You can use [Any] as `T` to allow the implementation to make the loosest possible match.
+ *
+ * See [getColumnNullable] when column contains `nullable` values.
+ *
+ * @throws IllegalStateException when column contains a `null` value.
+ * @throws IndexOutOfBoundsException if the [index] is out of range (negative or equals/exceeds the number of readable objects).
+ */
+inline fun <reified T : Any> Row.getColumn(index: Int): T =
+ getColumnNullable(index) ?: error("There is a null value inside column-index:$index.")
+
+/**
+ * Returns the value at the specified [column-index][index] in the resulting [Row], the value can be `null`.
+ * You can use [Any] as `T` to allow the implementation to make the loosest possible match.
+ *
+ * @throws IndexOutOfBoundsException if the [index] is out of range (negative or equals/exceeds the number of readable objects).
+ */
+inline fun <reified T : Any> Row.getColumnNullable(index: Int): T? = this[index, T::class.java]

spring-data-r2dbc/src/test/kotlin/org/springframework/data/r2dbc/RowExtensionsUnitTests.kt

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+/*
+ * Copyright 2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.data.r2dbc
+
+import io.mockk.mockk
+import io.mockk.verify
+import io.r2dbc.spi.Row
+import org.junit.Test
+
+/**
+ * Unit tests for [RowExtensions].
+ *
+ * @author George Papadopoulos
+ */
+class RowExtensionsUnitTests {
+
+ private val columnName = "random_column"
+ private val columnIndex = 12
+
+ private val row = mockk<Row>(relaxed = true)
+
+ @Test
+ fun `getColumnByName should call its Java counterpart with Integer`() {
+ row.getColumn<Int>(columnName)
+ verify { row.get(columnName, Integer::class.java) }
+ }
+
+ @Test
+ fun `getColumnByName should call its Java counterpart`() {
+ row.getColumn<String>(columnName)
+ verify { row.get(columnName, String::class.java) }
+ }
+
+ @Test
+ fun `getColumnNullableByName should call its Java counterpart`() {
+ row.getColumnNullable<String>(columnName)
+ verify { row.get(columnName, String::class.java) }
+ }
+
+ @Test
+ fun `getColumnByIndex should call its Java counterpart`() {
+ row.getColumn<String>(columnIndex)
+ verify { row.get(columnIndex, String::class.java) }
+ }
+
+
+ @Test
+ fun `getColumnNullableByIndex should call its Java counterpart`() {
+ row.getColumnNullable<String>(columnIndex)
+ verify { row.get(columnIndex, String::class.java) }
+ }
+}