com.microsoft.sqlserver.jdbc

Class SQLServerBlob

java.lang.Object

com.microsoft.sqlserver.jdbc.SQLServerBlob

All Implemented Interfaces:

Serializable, Blob

public final class SQLServerBlob
extends Object
implements Blob, Serializable

SQLServerBlob represents a binary LOB object and implements a java.sql.Blob.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
SQLServerBlob(SQLServerConnection connection, byte[] data) Deprecated.

Method Summary

Modifier and Type	Method and Description
void	free() Frees this Blob object and releases the resources that it holds.
InputStream	getBinaryStream() Return an input stream to read data from this BLOB
InputStream	getBinaryStream(long pos, long length)
byte[]	getBytes(long pos, int length) Retrieves all or part of the BLOB value that this Blob object represents, as an array of bytes.
long	length() Return the length of the BLOB
long	position(Blob pattern, long start) Retrieves the byte position in the BLOB value designated by this Blob object at which pattern begins.
long	position(byte[] bPattern, long start) Retrieves the byte position at which the specified byte array pattern begins within the BLOB value that this Blob object represents.
OutputStream	setBinaryStream(long pos) Retrieves a stream that can be used to write to the BLOB value that this Blob object represents
int	setBytes(long pos, byte[] bytes) Writes the given array of bytes into the Blob starting at position pos, and returns the number of bytes written.
int	setBytes(long pos, byte[] bytes, int offset, int len) Writes all or part of the given byte array to the BLOB value that this Blob object represents and returns the number of bytes written.
String	toString()
void	truncate(long len) Truncate a BLOB

Methods inherited from class java.lang.Object

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

Constructor Detail

SQLServerBlob

@Deprecated
public SQLServerBlob(SQLServerConnection connection,
                                  byte[] data)

Deprecated.

Create a new BLOB

Parameters:

connection - the database connection this blob is implemented on

data - the BLOB's data

Method Detail

toString

public final String toString()

Overrides:

toString in class Object

free

public void free()
          throws SQLException

Frees this Blob object and releases the resources that it holds. After free() has been called, any attempt to invoke a method other than free() will result in a SQLException being thrown. If free() is called multiple times, the subsequent calls to free are treated as a no-op.

Specified by:

free in interface Blob

Throws:

SQLException

getBinaryStream

public InputStream getBinaryStream()
                            throws SQLException

Return an input stream to read data from this BLOB

Specified by:

getBinaryStream in interface Blob

Returns:

the input stream to that contains the BLOB data

Throws:

SQLException

getBinaryStream

public InputStream getBinaryStream(long pos,
                                   long length)
                            throws SQLException

Specified by:

getBinaryStream in interface Blob

Throws:

SQLException

getBytes

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

Retrieves all or part of the BLOB value that this Blob object represents, as an array of bytes. This byte array contains up to length consecutive bytes starting at position pos.

Specified by:

getBytes in interface Blob

Parameters:

pos - - the ordinal position of the first byte in the BLOB value to be extracted; the first byte is at position 1

length - - the number of consecutive bytes to be copied; the value for length must be 0 or greater

Returns:

a byte array containing up to length consecutive bytes from the BLOB value designated by this Blob object, starting with the byte at position pos

Throws:

SQLException - - if there is an error accessing the BLOB value; if pos is less than 1 or length is less than 0

length

public long length()
            throws SQLException

Return the length of the BLOB

Specified by:

length in interface Blob

Returns:

the data length

Throws:

SQLException

position

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

Retrieves the byte position in the BLOB value designated by this Blob object at which pattern begins. The search begins at position start.

Specified by:

position in interface Blob

Parameters:

pattern - - the Blob object designating the BLOB value for which to search

start - - the position in the BLOB value at which to begin searching; the first position is 1

Returns:

the postion at which the pattern begins, else -1

Throws:

SQLException - - if there is an error accessing the BLOB value or if start is less than 1

position

public long position(byte[] bPattern,
                     long start)
              throws SQLException

Retrieves the byte position at which the specified byte array pattern begins within the BLOB value that this Blob object represents. The search for pattern begins at position start.

Specified by:

position in interface Blob

Parameters:

bPattern - - the byte array for which to search

start - - the position at which to begin searching; the first position is 1

Returns:

the position at which the pattern appears, else -1

Throws:

SQLException - - if there is an error accessing the BLOB or if start is less than 1

truncate

public void truncate(long len)
              throws SQLException

Truncate a BLOB

Specified by:

truncate in interface Blob

Parameters:

len - the new length for the BLOB

Throws:

SQLException

setBinaryStream

public OutputStream setBinaryStream(long pos)
                             throws SQLException

Retrieves a stream that can be used to write to the BLOB value that this Blob object represents

Specified by:

setBinaryStream in interface Blob

Parameters:

pos - - the position in the BLOB value at which to start writing; the first position is 1

Returns:

a java.io.OutputStream object to which data can be written

Throws:

SQLException - - if there is an error accessing the BLOB value or if pos is less than 1

setBytes

public int setBytes(long pos,
                    byte[] bytes)
             throws SQLException

Writes the given array of bytes into the Blob starting at position pos, and returns the number of bytes written.

Specified by:

setBytes in interface Blob

Parameters:

pos - the position (1 based) in the Blob object at which to start writing the data.

bytes - the array of bytes to be written into the Blob.

Returns:

the number of bytes written.

Throws:

SQLException - if there is an error accessing the BLOB value.

setBytes

public int setBytes(long pos,
                    byte[] bytes,
                    int offset,
                    int len)
             throws SQLException

Writes all or part of the given byte array to the BLOB value that this Blob object represents and returns the number of bytes written. Writing starts at position pos in the BLOB value; len bytes from the given byte wrray are written. The array of bytes will overwrite the existing bytes in the Blob object starting at the position pos. If the end of the Blob value is reached while writing the array bytes, then the length of the Blob value will be increased to accomodate the extra bytes. SQL Server behavior: If the value specified for pos is greater than the length+1 of the BLOB value then a SQLException is thrown.

Specified by:

setBytes in interface Blob

Parameters:

pos - - the position in the BLOB object at which to start writing; the first position is 1

bytes - - the array of bytes to be written to this BLOB object.

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

len - - the number of bytes to be written to the BLOB value from the array of bytes bytes

Returns:

the number of bytes written.

Throws:

SQLException - - if there is an error accessing the BLOB value or if pos is less than 1