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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.sqoop.mapreduce.mysql;
import com.cloudera.sqoop.lib.SqoopRecord;
import com.cloudera.sqoop.mapreduce.UpdateOutputFormat;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.mapreduce.RecordWriter;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import java.io.IOException;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.List;
/**
* Output format for MySQL Update/insert functionality. We will use MySQL
* clause INSERT INTO ... ON DUPLICATE KEY UPDATE, for more info please
* see official MySQL documentation.
*/
public class MySQLUpsertOutputFormat
extends UpdateOutputFormat {
private final Log log =
LogFactory.getLog(getClass());
@Override
/** {@inheritDoc} */
public RecordWriter getRecordWriter(TaskAttemptContext context)
throws IOException {
try {
return new MySQLUpsertRecordWriter(context);
} catch (Exception e) {
throw new IOException(e);
}
}
/**
* RecordWriter to write the output to UPDATE/INSERT statements.
*/
public class MySQLUpsertRecordWriter extends UpdateRecordWriter {
public MySQLUpsertRecordWriter(TaskAttemptContext context)
throws ClassNotFoundException, SQLException {
super(context);
}
/**
* {@inheritDoc}
*/
@Override
protected PreparedStatement getPreparedStatement(
List userRecords) throws SQLException {
PreparedStatement stmt = null;
// Synchronize on connection to ensure this does not conflict
// with the operations in the update thread.
Connection conn = getConnection();
synchronized (conn) {
stmt = conn.prepareStatement(getUpdateStatement(userRecords.size()));
}
// Inject the record parameters into the UPDATE and WHERE clauses. This
// assumes that the update key column is the last column serialized in
// by the underlying record. Our code auto-gen process for exports was
// responsible for taking care of this constraint.
int i = 0;
for (SqoopRecord record : userRecords) {
record.write(stmt, i);
i += columnNames.length;
}
stmt.addBatch();
return stmt;
}
protected String getUpdateStatement(int numRows) {
boolean first;
StringBuilder sb = new StringBuilder();
sb.append("INSERT INTO ");
sb.append(tableName);
sb.append("(");
first = true;
for (String column : columnNames) {
if (first) {
first = false;
} else {
sb.append(", ");
}
sb.append(column);
}
sb.append(") VALUES(");
for (int i = 0; i < numRows; i++) {
if (i > 0) {
sb.append("),(");
}
for (int j = 0; j < columnNames.length; j++) {
if (j > 0) {
sb.append(", ");
}
sb.append("?");
}
}
sb.append(") ON DUPLICATE KEY UPDATE ");
first = true;
for (String column : columnNames) {
if (first) {
first = false;
} else {
sb.append(", ");
}
sb.append(column).append("=VALUES(").append(column).append(")");
}
String query = sb.toString();
log.debug("Using upsert query: " + query);
return query;
}
}
}
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