| /** |
| * 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.hadoop.mapreduce.lib.db; |
| |
| import java.sql.Connection; |
| import java.sql.ResultSet; |
| import java.sql.PreparedStatement; |
| import java.sql.SQLException; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.conf.Configuration; |
| |
| /** |
| * A RecordReader that reads records from a MySQL table via DataDrivenDBRecordReader |
| */ |
| @InterfaceAudience.Public |
| @InterfaceStability.Evolving |
| public class MySQLDataDrivenDBRecordReader<T extends DBWritable> |
| extends DataDrivenDBRecordReader<T> { |
| |
| public MySQLDataDrivenDBRecordReader(DBInputFormat.DBInputSplit split, |
| Class<T> inputClass, Configuration conf, Connection conn, DBConfiguration dbConfig, |
| String cond, String [] fields, String table) throws SQLException { |
| super(split, inputClass, conf, conn, dbConfig, cond, fields, table, "MYSQL"); |
| } |
| |
| // Execute statements for mysql in unbuffered mode. |
| protected ResultSet executeQuery(String query) throws SQLException { |
| statement = getConnection().prepareStatement(query, |
| ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY); |
| statement.setFetchSize(Integer.MIN_VALUE); // MySQL: read row-at-a-time. |
| return statement.executeQuery(); |
| } |
| } |