| /** |
| * 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 org.apache.sqoop.lib.SqoopRecord; |
| import org.apache.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<K extends SqoopRecord, V> |
| extends UpdateOutputFormat<K, V> { |
| |
| private final Log log = |
| LogFactory.getLog(getClass()); |
| |
| @Override |
| /** {@inheritDoc} */ |
| public RecordWriter<K, V> 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<SqoopRecord> 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; |
| } |
| } |
| } |