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org.apache.sqoop.lib
Class LargeObjectLoader

java.lang.Object
  org.apache.sqoop.lib.LargeObjectLoader

All Implemented Interfaces:

java.io.Closeable

Direct Known Subclasses:

LargeObjectLoader

public class LargeObjectLoader
extends java.lang.Object
implements java.io.Closeable

Contains a set of methods which can read db columns from a ResultSet into Java types, and do serialization of these types to/from DataInput/DataOutput for use with Hadoop's Writable implementation. This supports null values for all types. This is a singleton instance class; only one may exist at a time. However, its lifetime is limited to the current TaskInputOutputContext's life.

Field Summary

static long	DEFAULT_MAX_LOB_LENGTH
static java.lang.String	MAX_INLINE_LOB_LEN_KEY

Constructor Summary

LargeObjectLoader(org.apache.hadoop.conf.Configuration conf, org.apache.hadoop.fs.Path workPath)
Create a new LargeObjectLoader.

Method Summary

void	close()
protected void	finalize()
BlobRef	readBlobRef(int colNum, java.sql.ResultSet r) Actually read a BlobRef instance from the ResultSet and materialize the data either inline or to a file.
ClobRef	readClobRef(int colNum, java.sql.ResultSet r) Actually read a ClobRef instance from the ResultSet and materialize the data either inline or to a file.

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_MAX_LOB_LENGTH

public static final long DEFAULT_MAX_LOB_LENGTH

See Also:

Constant Field Values

MAX_INLINE_LOB_LEN_KEY

public static final java.lang.String MAX_INLINE_LOB_LEN_KEY

See Also:

Constant Field Values

Constructor Detail

LargeObjectLoader

public LargeObjectLoader(org.apache.hadoop.conf.Configuration conf,
                         org.apache.hadoop.fs.Path workPath)
                  throws java.io.IOException

Create a new LargeObjectLoader.

Parameters:

conf - the Configuration to use

workPath - the HDFS working directory for this task.

Throws:

java.io.IOException

Method Detail

finalize

protected void finalize()
                 throws java.lang.Throwable

Overrides:

finalize in class java.lang.Object

Throws:

java.lang.Throwable

close

public void close()
           throws java.io.IOException

Specified by:

close in interface java.io.Closeable

Throws:

java.io.IOException

readBlobRef

public BlobRef readBlobRef(int colNum,
                           java.sql.ResultSet r)
                    throws java.io.IOException,
                           java.lang.InterruptedException,
                           java.sql.SQLException

Actually read a BlobRef instance from the ResultSet and materialize the data either inline or to a file.

Parameters:

colNum - the column of the ResultSet's current row to read.

r - the ResultSet to read from.

Returns:

a BlobRef encapsulating the data in this field.

Throws:

java.io.IOException - if an error occurs writing to the FileSystem.

java.sql.SQLException - if an error occurs reading from the database.

java.lang.InterruptedException

readClobRef

public ClobRef readClobRef(int colNum,
                           java.sql.ResultSet r)
                    throws java.io.IOException,
                           java.lang.InterruptedException,
                           java.sql.SQLException

Actually read a ClobRef instance from the ResultSet and materialize the data either inline or to a file.

Parameters:

colNum - the column of the ResultSet's current row to read.

r - the ResultSet to read from.

Returns:

a ClobRef encapsulating the data in this field.

Throws:

java.io.IOException - if an error occurs writing to the FileSystem.

java.sql.SQLException - if an error occurs reading from the database.

java.lang.InterruptedException