Package org.apache.hadoop.mapreduce.lib.db

Class OracleDBRecordReader<T extends DBWritable>

java.lang.Object

org.apache.hadoop.mapreduce.RecordReader<LongWritable,T>

org.apache.hadoop.mapreduce.lib.db.DBRecordReader<T>

org.apache.hadoop.mapreduce.lib.db.OracleDBRecordReader<T>

All Implemented Interfaces:

Closeable, AutoCloseable

@Public
@Evolving
public class OracleDBRecordReader<T extends DBWritable>
extends DBRecordReader<T>

A RecordReader that reads records from an Oracle SQL table.

Field Summary

Fields

Modifier and Type	Field	Description
static final String	SESSION_TIMEZONE_KEY	Configuration key to set to a timezone string.

Fields inherited from class org.apache.hadoop.mapreduce.lib.db.DBRecordReader

statement

Constructor Summary

Constructors

Constructor	Description
OracleDBRecordReader(org.apache.hadoop.mapreduce.lib.db.DBInputFormat.DBInputSplit split, Class<T> inputClass, Configuration conf, Connection conn, DBConfiguration dbConfig, String cond, String[] fields, String table)

Method Summary

Modifier and Type	Method	Description
protected String	getSelectQuery()	Returns the query for selecting the records from an Oracle DB.
static void	setSessionTimeZone(Configuration conf, Connection conn)	Set session time zone

Methods inherited from class org.apache.hadoop.mapreduce.lib.db.DBRecordReader

close, createValue, executeQuery, getConditions, getConnection, getCurrentKey, getCurrentValue, getDBConf, getFieldNames, getPos, getProgress, getSplit, getStatement, getTableName, initialize, next, nextKeyValue, setStatement

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

SESSION_TIMEZONE_KEY

public static final String SESSION_TIMEZONE_KEY

Configuration key to set to a timezone string.

See Also:

• Constant Field Values

Constructor Details

OracleDBRecordReader

public OracleDBRecordReader(org.apache.hadoop.mapreduce.lib.db.DBInputFormat.DBInputSplit split,
 Class<T> inputClass,
 Configuration conf,
 Connection conn,
 DBConfiguration dbConfig,
 String cond,
 String[] fields,
 String table)
                     throws SQLException

Throws:

SQLException

Method Details

getSelectQuery

protected String getSelectQuery()

Returns the query for selecting the records from an Oracle DB.

Overrides:

getSelectQuery in class DBRecordReader<T extends DBWritable>

setSessionTimeZone

public static void setSessionTimeZone(Configuration conf,
 Connection conn)
                               throws SQLException

Set session time zone

Parameters:

conf - The current configuration. We read the 'oracle.sessionTimeZone' property from here.

conn - The connection to alter the timezone properties of.

Throws:

SQLException