com.ibm.as400.access
Class AS400JDBCBlob

java.lang.Object
  com.ibm.as400.access.AS400JDBCBlob

All Implemented Interfaces:

Blob

public class AS400JDBCBlob

extends Object

implements Blob

The AS400JDBCBlob class provides access to binary large objects. The data is valid only within the current transaction.

Method Summary

InputStream	getBinaryStream() Returns the entire BLOB as a stream of uninterpreted bytes.
byte[]	getBytes(long position, int length) Returns part of the contents of the BLOB.
long	length() Returns the length of the BLOB.
long	position(Blob pattern, long position) Returns the position at which a pattern is found in the BLOB.
long	position(byte[] pattern, long position) Returns the position at which a pattern is found in the BLOB.
OutputStream	setBinaryStream(long position) Returns a stream that an application can use to write to this BLOB.
int	setBytes(long position, byte[] bytesToWrite) Writes an array of bytes to this BLOB, starting at position positionToStartWriting in the BLOB.
int	setBytes(long position, byte[] bytesToWrite, int offset, int lengthOfWrite) Writes all or part of the byte array the application passes in to this BLOB, starting at position position in the BLOB.
void	truncate(long lengthOfBLOB) Truncates this BLOB to a length of lengthOfBLOB bytes.

Methods inherited from class java.lang.Object

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

Method Detail

getBinaryStream

public InputStream getBinaryStream()
                            throws SQLException

Returns the entire BLOB as a stream of uninterpreted bytes.

Specified by:

getBinaryStream in interface Blob

Returns:

The stream.

Throws:

SQLException - If an error occurs.

getBytes

public byte[] getBytes(long position,
                       int length)
                throws SQLException

Returns part of the contents of the BLOB.

Specified by:

getBytes in interface Blob

Parameters:

position - The start position within the BLOB (1-based).

length - The length to return.

Returns:

The contents.

Throws:

SQLException - If the start position is not valid, if the length is not valid, or an error occurs.

length

public long length()
            throws SQLException

Returns the length of the BLOB.

Specified by:

length in interface Blob

Returns:

The length of the BLOB, in bytes.

Throws:

SQLException - If an error occurs.

position

public long position(byte[] pattern,
                     long position)
              throws SQLException

Returns the position at which a pattern is found in the BLOB.

Specified by:

position in interface Blob

Parameters:

pattern - The pattern.

position - The position within the BLOB to begin searching (1-based).

Returns:

The position at which the pattern is found, or -1 if the pattern is not found.

Throws:

SQLException - If the pattern is null, the position is not valid, or an error occurs.

position

public long position(Blob pattern,
                     long position)
              throws SQLException

Returns the position at which a pattern is found in the BLOB.

Specified by:

position in interface Blob

Parameters:

pattern - The pattern.

position - The position within the BLOB to begin searching (1-based).

Returns:

The position at which the pattern is found, or -1 if the pattern is not found.

Throws:

SQLException - If the pattern is null, the position is not valid, or an error occurs.

setBinaryStream

public OutputStream setBinaryStream(long position)
                             throws SQLException

Returns a stream that an application can use to write to this BLOB. The stream begins at position positionToStartWriting.

Specified by:

setBinaryStream in interface Blob

Parameters:

position - The position (1-based) in the BLOB where writes should start.

Returns:

An OutputStream object to which data can be written by an application.

Throws:

SQLException - If there is an error accessing the BLOB or if the position specified is greater than the length of the BLOB.

setBytes

public int setBytes(long position,
                    byte[] bytesToWrite)
             throws SQLException

Writes an array of bytes to this BLOB, starting at position positionToStartWriting in the BLOB.

Specified by:

setBytes in interface Blob

Parameters:

position - The position (1-based) in the BLOB where writes should start.

bytesToWrite - The array of bytes to be written to this BLOB.

Returns:

The number of bytes written to the BLOB.

Throws:

SQLException - If there is an error accessing the BLOB or if the position specified is greater than the length of the BLOB.

setBytes

public int setBytes(long position,
                    byte[] bytesToWrite,
                    int offset,
                    int lengthOfWrite)
             throws SQLException

Writes all or part of the byte array the application passes in to this BLOB, starting at position position in the BLOB. The BLOB will be truncated after the last byte written. The lengthOfWrite bytes written will start from offset in the bytes that were provided by the application.

Specified by:

setBytes in interface Blob

Parameters:

position - The position (1-based) in the BLOB where writes should start.

bytesToWrite - The array of bytes to be written to this BLOB.

offset - The offset into the array at which to start reading bytes (0-based).

lengthOfWrite - The number of bytes to be written to the BLOB from the array of bytes.

Returns:

The number of bytes written.

Throws:

SQLException - If there is an error accessing the BLOB or if the position specified is greater than the length of the BLOB.

truncate

public void truncate(long lengthOfBLOB)
              throws SQLException

Truncates this BLOB to a length of lengthOfBLOB bytes.

Specified by:

truncate in interface Blob

Parameters:

lengthOfBLOB - The length, in bytes, that this BLOB should be after truncation.

Throws:

SQLException - If there is an error accessing the BLOB.