| /** |
| * 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.db; |
| |
| import java.sql.Connection; |
| import java.sql.SQLException; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.sqoop.mapreduce.DBWritable; |
| |
| /** |
| * A RecordReader that reads records from DB2. |
| */ |
| public class Db2DBRecordReader<T extends DBWritable> |
| extends DBRecordReader<T> { |
| |
| private static final Log LOG = LogFactory.getLog(Db2DBRecordReader.class); |
| |
| // CHECKSTYLE:OFF |
| public Db2DBRecordReader(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); |
| } |
| // CHECKSTYLE:ON |
| |
| /** Returns the query for selecting the records from DB2. */ |
| protected String getSelectQuery() { |
| String query = super.getSelectQuery(); |
| if (getDBConf().getInputQuery() == null) { |
| // If there is no user-defined query, we construct a default select query |
| // as follows: |
| // SELECT <columns> FROM <table name> AS <table name> |
| // However, in DB2 'AS <table name>' can cause a syntax error if table |
| // name is a qualified name. Since the AS clause is not necessary, we |
| // remove it. |
| query = query.replace(" AS " + getTableName(), ""); |
| } |
| return query; |
| } |
| } |