Add support for Oracle bind marker scheme using R2DBC

We now support Oracle's bind marker scheme that identifies dynamic
parameters using names that are prefixed with a colon such as
`:P0_myparam`.

Closes spring-projectsgh-26680

spring-r2dbc/src/main/java/org/springframework/r2dbc/core/binding/BindMarkersFactoryResolver.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2020 the original author or authors.
+ * Copyright 2002-2021 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.
@@ -118,10 +118,12 @@ static class BuiltInBindMarkersFactoryProvider implements BindMarkerFactoryProvi
 
 		static {
 			BUILTIN.put("H2", BindMarkersFactory.indexed("$", 1));
+			BUILTIN.put("MariaDB", BindMarkersFactory.anonymous("?"));
 			BUILTIN.put("Microsoft SQL Server", BindMarkersFactory.named("@", "P", 32,
 					BuiltInBindMarkersFactoryProvider::filterBindMarker));
 			BUILTIN.put("MySQL", BindMarkersFactory.anonymous("?"));
-			BUILTIN.put("MariaDB", BindMarkersFactory.anonymous("?"));
+			BUILTIN.put("Oracle", BindMarkersFactory.named(":", "P", 32,
+					BuiltInBindMarkersFactoryProvider::filterBindMarker));
 			BUILTIN.put("PostgreSQL", BindMarkersFactory.indexed("$", 1));
 		}
 

spring-r2dbc/src/test/java/org/springframework/r2dbc/core/binding/BindMarkersFactoryResolverUnitTests.java

@@ -0,0 +1,108 @@
+/*
+ * Copyright 2002-2021 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.r2dbc.core.binding;
+
+import io.r2dbc.spi.Connection;
+import io.r2dbc.spi.ConnectionFactory;
+import io.r2dbc.spi.ConnectionFactoryMetadata;
+import org.junit.jupiter.api.Test;
+import org.reactivestreams.Publisher;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Unit tests for {@link BindMarkersFactoryResolver}.
+ *
+ * @author Mark Paluch
+ */
+class BindMarkersFactoryResolverUnitTests {
+
+	@Test
+	void shouldReturnBindMarkersFactoryForH2() {
+
+		BindMarkers bindMarkers = BindMarkersFactoryResolver
+				.resolve(new MockConnectionFactory("H2")).create();
+
+		assertThat(bindMarkers.next().getPlaceholder()).isEqualTo("$1");
+	}
+
+	@Test
+	void shouldReturnBindMarkersFactoryForMariaDB() {
+
+		BindMarkers bindMarkers = BindMarkersFactoryResolver
+				.resolve(new MockConnectionFactory("MariaDB")).create();
+
+		assertThat(bindMarkers.next().getPlaceholder()).isEqualTo("?");
+	}
+
+	@Test
+	void shouldReturnBindMarkersFactoryForMicrosoftSQLServer() {
+
+		BindMarkers bindMarkers = BindMarkersFactoryResolver
+				.resolve(new MockConnectionFactory("Microsoft SQL Server")).create();
+
+		assertThat(bindMarkers.next("foo").getPlaceholder()).isEqualTo("@P0_foo");
+	}
+
+	@Test
+	void shouldReturnBindMarkersFactoryForMySQL() {
+
+		BindMarkers bindMarkers = BindMarkersFactoryResolver
+				.resolve(new MockConnectionFactory("MySQL")).create();
+
+		assertThat(bindMarkers.next().getPlaceholder()).isEqualTo("?");
+	}
+
+	@Test
+	void shouldReturnBindMarkersFactoryForOracle() {
+
+		BindMarkers bindMarkers = BindMarkersFactoryResolver
+				.resolve(new MockConnectionFactory("Oracle Database")).create();
+
+		assertThat(bindMarkers.next("foo").getPlaceholder()).isEqualTo(":P0_foo");
+	}
+
+	@Test
+	void shouldReturnBindMarkersFactoryForPostgreSQL() {
+
+		BindMarkers bindMarkers = BindMarkersFactoryResolver
+				.resolve(new MockConnectionFactory("PostgreSQL")).create();
+
+		assertThat(bindMarkers.next().getPlaceholder()).isEqualTo("$1");
+	}
+
+	static class MockConnectionFactory implements ConnectionFactory {
+
+		private final String driverName;
+
+		MockConnectionFactory(String driverName) {
+			this.driverName = driverName;
+		}
+
+		@Override
+		public Publisher<? extends Connection> create() {
+			throw new UnsupportedOperationException();
+		}
+
+		@Override
+		public ConnectionFactoryMetadata getMetadata() {
+			return () -> driverName;
+		}
+
+	}
+
+}