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java.lang.Objectorg.objectweb.cjdbc.driver.Blob
The representation (mapping) in the JavaTM
programming language of an SQL BLOB
value. An SQL
BLOB
is a built-in type that stores a Binary Large Object as
a column value in a row
of a database table. By default drivers implement Blob
using an SQL locator(BLOB)
, which means that a
Blob
object contains a logical pointer to the SQL
BLOB
data rather than the data itself. A
Blob
object is valid for the duration of the
transaction in which is was created.
Methods in the interfaces ResultSet
, CallableStatement
,
and PreparedStatement
, such as getBlob
and
setBlob
allow a programmer to
access an SQL BLOB
value. The Blob
interface provides methods for getting the length of an SQL
BLOB
(Binary Large Object) value, for materializing a
BLOB
value on the client, and for determining the
position of a pattern of bytes within a BLOB
value. In
addition, this interface has methods for updating a
BLOB
value.
Field Summary | |
(package private) byte[] |
binaryData
The binary data that makes up this BLOB . |
Constructor Summary | |
Blob(byte[] data)
Creates a new Blob instance. |
Method Summary | |
protected static java.lang.String |
data2hex(byte[] data)
Convert data into hexa |
(package private) static byte[] |
escapeblock(byte[] buf,
int size)
Convert the data into hexa format so we can pass it as a string to the database. |
java.io.InputStream |
getBinaryStream()
Retrieves the BLOB value designated by this
Blob instance as a stream. |
byte[] |
getBytes(long pos,
int length)
Retrieves all or part of the BLOB value that this
Blob object represents, as an array of bytes. |
protected static byte[] |
hex2data(java.lang.String str)
convert hexa into data |
long |
length()
Returns the number of bytes in the BLOB value designated by
this Blob object. |
long |
position(java.sql.Blob pattern,
long start)
Retrieves the byte position in the BLOB value designated by
this Blob object at which pattern begins. |
long |
position(byte[] pattern,
long start)
Retrieves the byte position at which the specified byte array pattern begins within the BLOB value that this
Blob object represents. |
(package private) static byte[] |
rescapeblock(byte[] buf)
Reconvert the original data of the buffer by re-converting all the hexa data into bytes. |
java.io.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 to the BLOB value that this
Blob object represents, 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. |
private static byte |
toDataNibble(char c)
convert hexa char to byte value |
private static char |
toHexChar(int i)
convert value to hexa value |
void |
truncate(long len)
Truncates the BLOB value that this Blob object
represents to be len bytes in length. |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
byte[] binaryData
BLOB
.
Constructor Detail |
public Blob(byte[] data)
Blob
instance.
data
- an byte
arrayMethod Detail |
public long length() throws java.sql.SQLException
BLOB
value designated by
this Blob
object.
length
in interface java.sql.Blob
BLOB
in bytes
java.sql.SQLException
- if there is an error accessing the length of the
BLOB
public byte[] getBytes(long pos, int length) throws java.sql.SQLException
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
.
getBytes
in interface java.sql.Blob
pos
- the ordinal position of the first byte in the BLOB
value to be extracted; the first byte is at position 1length
- the number of consecutive bytes to be copied
length
consecutive
bytes from the BLOB
value designated by this
Blob
object, starting with the byte at position
pos
java.sql.SQLException
- if there is an error accessing the
BLOB
valuesetBytes(long, byte[])
public java.io.InputStream getBinaryStream() throws java.sql.SQLException
BLOB
value designated by this
Blob
instance as a stream.
getBinaryStream
in interface java.sql.Blob
BLOB
data
java.sql.SQLException
- if there is an error accessing
the BLOB
valuesetBinaryStream(long)
public long position(byte[] pattern, long start) throws java.sql.SQLException
pattern
begins within the BLOB
value that this
Blob
object represents. The search for pattern
begins at position start
.
position
in interface java.sql.Blob
pattern
- the byte array for which to searchstart
- the position at which to begin searching; the first
position is 1
java.sql.SQLException
- if there is an error accessing the
BLOB
public long position(java.sql.Blob pattern, long start) throws java.sql.SQLException
BLOB
value designated by
this Blob
object at which pattern
begins. The
search begins at position start
.
position
in interface java.sql.Blob
pattern
- the Blob
object designating the
BLOB
value for which to searchstart
- the position in the BLOB
value at which
to begin searching; the first position is 1
java.sql.SQLException
- if there is an error accessing the
BLOB
valuepublic int setBytes(long pos, byte[] bytes) throws java.sql.SQLException
BLOB
value that this
Blob
object represents, starting at position
pos
, and returns the number of bytes written.
setBytes
in interface java.sql.Blob
pos
- the position in the BLOB
object at which to start
writingbytes
- the array of bytes to be written to the
BLOB
value that this Blob
object represents
java.sql.SQLException
- if there is an error accessing the
BLOB
valuegetBytes(long, int)
public int setBytes(long pos, byte[] bytes, int offset, int len) throws java.sql.SQLException
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 array are written.
setBytes
in interface java.sql.Blob
pos
- the position in the BLOB
object at which to start
writingbytes
- the array of bytes to be written to this
BLOB
objectoffset
- the offset into the array bytes
at which to
start reading the bytes to be setlen
- the number of bytes to be written to the BLOB
value from the array of bytes bytes
java.sql.SQLException
- if there is an error accessing the
BLOB
valuegetBytes(long, int)
public java.io.OutputStream setBinaryStream(long pos) throws java.sql.SQLException
BLOB
value that this Blob
object represents. The stream begins
at position pos
.
setBinaryStream
in interface java.sql.Blob
pos
- the position in the BLOB
value at which to start
writing
java.io.OutputStream
object to which data can be
written
java.sql.SQLException
- if there is an error accessing the
BLOB
valuegetBinaryStream()
public void truncate(long len) throws java.sql.SQLException
BLOB
value that this Blob
object
represents to be len
bytes in length.
truncate
in interface java.sql.Blob
len
- the length, in bytes, to which the BLOB
value that this Blob
object represents should be
truncated
java.sql.SQLException
- if there is an error accessing the
BLOB
valuestatic final byte[] escapeblock(byte[] buf, int size)
buf
- is the data needed to be convertedsize
- the size of the buffer to be converted
static final byte[] rescapeblock(byte[] buf)
buf
- the byte array of data as hexa
protected static java.lang.String data2hex(byte[] data)
data
- to convert
protected static byte[] hex2data(java.lang.String str)
str
- to convert
private static char toHexChar(int i)
i
- byte to convert
private static byte toDataNibble(char c)
c
- hexa character
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