hadoop OracleDataDrivenDBInputFormat 源码
haddop OracleDataDrivenDBInputFormat 代码
文件路径：/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/lib/db/OracleDataDrivenDBInputFormat.java
/**
* 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.io.IOException;
import java.sql.SQLException;
import java.sql.Types;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.mapreduce.RecordReader;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.conf.Configurable;
import org.apache.hadoop.conf.Configuration;
/**
* A InputFormat that reads input data from an SQL table in an Oracle db.
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public class OracleDataDrivenDBInputFormat<T extends DBWritable>
extends DataDrivenDBInputFormat<T> implements Configurable {
/**
* @return the DBSplitter implementation to use to divide the table/query into InputSplits.
*/
@Override
protected DBSplitter getSplitter(int sqlDataType) {
switch (sqlDataType) {
case Types.DATE:
case Types.TIME:
case Types.TIMESTAMP:
return new OracleDateSplitter();
default:
return super.getSplitter(sqlDataType);
}
}
@Override
protected RecordReader<LongWritable, T> createDBRecordReader(DBInputSplit split,
Configuration conf) throws IOException {
DBConfiguration dbConf = getDBConf();
@SuppressWarnings("unchecked")
Class<T> inputClass = (Class<T>) (dbConf.getInputClass());
try {
// Use Oracle-specific db reader
return new OracleDataDrivenDBRecordReader<T>(split, inputClass,
conf, createConnection(), dbConf, dbConf.getInputConditions(),
dbConf.getInputFieldNames(), dbConf.getInputTableName());
} catch (SQLException ex) {
throw new IOException(ex.getMessage());
}
}
}
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