flink-connectors/flink-connector-jdbc/src/test/java/org/apache/flink/connector/jdbc/table/JdbcDynamicTableSourceITCase.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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
 *
 *     http://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.apache.flink.connector.jdbc.table;

import org.apache.flink.connector.jdbc.JdbcTestBase;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.table.api.EnvironmentSettings;
import org.apache.flink.table.api.bridge.java.StreamTableEnvironment;
import org.apache.flink.table.planner.runtime.utils.StreamTestSink;
import org.apache.flink.test.util.AbstractTestBase;
import org.apache.flink.types.Row;
import org.apache.flink.util.CollectionUtil;

import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Iterator;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;

import static org.junit.Assert.assertEquals;

/**
 * ITCase for {@link JdbcDynamicTableSource}.
 */
public class JdbcDynamicTableSourceITCase extends AbstractTestBase {

	public static final String DRIVER_CLASS = "org.apache.derby.jdbc.EmbeddedDriver";
	public static final String DB_URL = "jdbc:derby:memory:test";
	public static final String INPUT_TABLE = "jdbDynamicTableSource";

	@Before
	public void before() throws ClassNotFoundException, SQLException {
		System.setProperty("derby.stream.error.field", JdbcTestBase.class.getCanonicalName() + ".DEV_NULL");
		Class.forName(DRIVER_CLASS);

		try (
			Connection conn = DriverManager.getConnection(DB_URL + ";create=true");
			Statement statement = conn.createStatement()) {
			statement.executeUpdate("CREATE TABLE " + INPUT_TABLE + " (" +
				"id BIGINT NOT NULL," +
				"timestamp6_col TIMESTAMP, " +
				"timestamp9_col TIMESTAMP, " +
				"time_col TIME, " +
				"real_col FLOAT(23), " +    // A precision of 23 or less makes FLOAT equivalent to REAL.
				"double_col FLOAT(24)," +   // A precision of 24 or greater makes FLOAT equivalent to DOUBLE PRECISION.
				"decimal_col DECIMAL(10, 4))");
			statement.executeUpdate("INSERT INTO " + INPUT_TABLE + " VALUES (" +
				"1, TIMESTAMP('2020-01-01 15:35:00.123456'), TIMESTAMP('2020-01-01 15:35:00.123456789'), " +
				"TIME('15:35:00'), 1.175E-37, 1.79769E+308, 100.1234)");
			statement.executeUpdate("INSERT INTO " + INPUT_TABLE + " VALUES (" +
				"2, TIMESTAMP('2020-01-01 15:36:01.123456'), TIMESTAMP('2020-01-01 15:36:01.123456789'), " +
				"TIME('15:36:01'), -1.175E-37, -1.79769E+308, 101.1234)");
		}
	}

	@After
	public void clearOutputTable() throws Exception {
		Class.forName(DRIVER_CLASS);
		try (
			Connection conn = DriverManager.getConnection(DB_URL);
			Statement stat = conn.createStatement()) {
			stat.executeUpdate("DROP TABLE " + INPUT_TABLE);
		}
		StreamTestSink.clear();
	}

	@Test
	public void testJdbcSource() throws Exception {
		StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
		EnvironmentSettings envSettings = EnvironmentSettings.newInstance()
			.useBlinkPlanner()
			.inStreamingMode()
			.build();
		StreamTableEnvironment tEnv = StreamTableEnvironment.create(env, envSettings);

		tEnv.executeSql(
			"CREATE TABLE " + INPUT_TABLE + "(" +
				"id BIGINT," +
				"timestamp6_col TIMESTAMP(6)," +
				"timestamp9_col TIMESTAMP(9)," +
				"time_col TIME," +
				"real_col FLOAT," +
				"double_col DOUBLE," +
				"decimal_col DECIMAL(10, 4)" +
				") WITH (" +
				"  'connector'='jdbc'," +
				"  'url'='" + DB_URL + "'," +
				"  'table-name'='" + INPUT_TABLE + "'" +
				")"
		);

		Iterator<Row> collected = tEnv.executeSql("SELECT * FROM " + INPUT_TABLE).collect();
		List<String> result = CollectionUtil.iteratorToList(collected).stream()
			.map(Row::toString)
			.sorted()
			.collect(Collectors.toList());
		List<String> expected =
			Stream.of(
				"1,2020-01-01T15:35:00.123456,2020-01-01T15:35:00.123456789,15:35,1.175E-37,1.79769E308,100.1234",
				"2,2020-01-01T15:36:01.123456,2020-01-01T15:36:01.123456789,15:36:01,-1.175E-37,-1.79769E308,101.1234")
			.sorted().collect(Collectors.toList());
		assertEquals(expected, result);
	}

	@Test
	public void testProject() throws Exception {
		StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
		EnvironmentSettings envSettings = EnvironmentSettings.newInstance()
			.useBlinkPlanner()
			.inStreamingMode()
			.build();
		StreamTableEnvironment tEnv = StreamTableEnvironment.create(env, envSettings);

		tEnv.executeSql(
			"CREATE TABLE " + INPUT_TABLE + "(" +
				"id BIGINT," +
				"timestamp6_col TIMESTAMP(6)," +
				"timestamp9_col TIMESTAMP(9)," +
				"time_col TIME," +
				"real_col FLOAT," +
				"double_col DOUBLE," +
				"decimal_col DECIMAL(10, 4)" +
				") WITH (" +
				"  'connector'='jdbc'," +
				"  'url'='" + DB_URL + "'," +
				"  'table-name'='" + INPUT_TABLE + "'," +
				"  'scan.partition.column'='id'," +
				"  'scan.partition.num'='2'," +
				"  'scan.partition.lower-bound'='0'," +
				"  'scan.partition.upper-bound'='100'" +
				")"
		);

		Iterator<Row> collected = tEnv.executeSql("SELECT id,timestamp6_col,decimal_col FROM " + INPUT_TABLE).collect();
		List<String> result = CollectionUtil.iteratorToList(collected).stream()
			.map(Row::toString)
			.sorted()
			.collect(Collectors.toList());
		List<String> expected =
			Stream.of(
				"1,2020-01-01T15:35:00.123456,100.1234",
				"2,2020-01-01T15:36:01.123456,101.1234")
				.sorted().collect(Collectors.toList());
		assertEquals(expected, result);
	}
}