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JavaJdbcRDDSuite.java
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JavaJdbcRDDSuite.java
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/*
* 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.spark;
import java.io.Serializable;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import org.apache.spark.api.java.JavaRDD;
import org.apache.spark.api.java.JavaSparkContext;
import org.apache.spark.api.java.function.Function;
import org.apache.spark.api.java.function.Function2;
import org.apache.spark.rdd.JdbcRDD;
import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
public class JavaJdbcRDDSuite implements Serializable {
private transient JavaSparkContext sc;
@Before
public void setUp() throws ClassNotFoundException, SQLException {
sc = new JavaSparkContext("local", "JavaAPISuite");
Class.forName("org.apache.derby.jdbc.EmbeddedDriver");
Connection connection =
DriverManager.getConnection("jdbc:derby:target/JavaJdbcRDDSuiteDb;create=true");
try {
Statement create = connection.createStatement();
create.execute(
"CREATE TABLE FOO(" +
"ID INTEGER NOT NULL GENERATED ALWAYS AS IDENTITY (START WITH 1, INCREMENT BY 1)," +
"DATA INTEGER)");
create.close();
PreparedStatement insert = connection.prepareStatement("INSERT INTO FOO(DATA) VALUES(?)");
for (int i = 1; i <= 100; i++) {
insert.setInt(1, i * 2);
insert.executeUpdate();
}
insert.close();
} catch (SQLException e) {
// If table doesn't exist...
if (e.getSQLState().compareTo("X0Y32") != 0) {
throw e;
}
} finally {
connection.close();
}
}
@After
public void tearDown() throws SQLException {
try {
DriverManager.getConnection("jdbc:derby:target/JavaJdbcRDDSuiteDb;shutdown=true");
} catch(SQLException e) {
// Throw if not normal single database shutdown
// https://db.apache.org/derby/docs/10.2/ref/rrefexcept71493.html
if (e.getSQLState().compareTo("08006") != 0) {
throw e;
}
}
sc.stop();
sc = null;
}
@Test
public void testJavaJdbcRDD() throws Exception {
JavaRDD<Integer> rdd = JdbcRDD.create(
sc,
new JdbcRDD.ConnectionFactory() {
@Override
public Connection getConnection() throws SQLException {
return DriverManager.getConnection("jdbc:derby:target/JavaJdbcRDDSuiteDb");
}
},
"SELECT DATA FROM FOO WHERE ? <= ID AND ID <= ?",
1, 100, 1,
new Function<ResultSet, Integer>() {
@Override
public Integer call(ResultSet r) throws Exception {
return r.getInt(1);
}
}
).cache();
Assert.assertEquals(100, rdd.count());
Assert.assertEquals(
Integer.valueOf(10100),
rdd.reduce(new Function2<Integer, Integer, Integer>() {
@Override
public Integer call(Integer i1, Integer i2) {
return i1 + i2;
}
}));
}
}