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Préférences
Moteurs de recherche
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JavaTM 2 Platform Std. Ed. v1.6.0
java.sql
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Method Summary | |
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void |
free()
This method frees the Blob object and releases the resources that
it holds. |
InputStream |
getBinaryStream()
Retrieves the BLOB value designated by this
Blob instance as a stream. |
InputStream |
getBinaryStream(long pos,
long length)
Returns an InputStream object that contains a partial Blob value,
starting with the byte specified by pos, which is length bytes in 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()
Returns the number of bytes in the BLOB value
designated by this Blob object. |
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[] pattern,
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 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. |
void |
truncate(long len)
Truncates the BLOB value that this Blob
object represents to be len bytes in length. |
Method Detail |
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long length() throws SQLException
BLOB
value
designated by this Blob
object.
BLOB
in bytes
SQLException
- if there is an error accessing the
length of the BLOB
SQLFeatureNotSupportedException
- if the JDBC driver does not support
this methodbyte[] getBytes(long pos, int length) throws 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
.
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; the value
for length must be 0 or greater
length
consecutive bytes from the BLOB
value designated
by this Blob
object, starting with the
byte at position pos
SQLException
- if there is an error accessing the
BLOB
value; if pos is less than 1 or length is
less than 0
SQLFeatureNotSupportedException
- if the JDBC driver does not support
this methodsetBytes(long, byte[])
InputStream getBinaryStream() throws SQLException
BLOB
value designated by this
Blob
instance as a stream.
BLOB
data
SQLException
- if there is an error accessing the
BLOB
value
SQLFeatureNotSupportedException
- if the JDBC driver does not support
this methodsetBinaryStream(long)
long position(byte[] pattern, long start) throws SQLException
pattern
begins within the BLOB
value that this Blob
object represents. The
search for pattern
begins at position
start
.
pattern
- the byte array for which to searchstart
- the position at which to begin searching; the
first position is 1
SQLException
- if there is an error accessing the
BLOB
or if start is less than 1
SQLFeatureNotSupportedException
- if the JDBC driver does not support
this methodlong position(Blob pattern, long start) throws SQLException
BLOB
value
designated by this Blob
object at which
pattern
begins. The search begins at position
start
.
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
SQLException
- if there is an error accessing the
BLOB
value or if start is less than 1
SQLFeatureNotSupportedException
- if the JDBC driver does not support
this methodint setBytes(long pos, byte[] bytes) throws SQLException
BLOB
value that
this Blob
object represents, starting at position
pos
, and returns the number of bytes 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 of bytes, then the length of the Blob
value will be increased to accomodate the extra bytes.
Note: If the value specified for pos
is greater then the length+1 of the BLOB
value then the
behavior is undefined. Some JDBC drivers may throw a
SQLException
while other drivers may support this
operation.
pos
- the position in the BLOB
object at which
to start writing; the first position is 1bytes
- the array of bytes to be written to the BLOB
value that this Blob
object represents
SQLException
- if there is an error accessing the
BLOB
value or if pos is less than 1
SQLFeatureNotSupportedException
- if the JDBC driver does not support
this methodgetBytes(long, int)
int setBytes(long pos, byte[] bytes, int offset, int len) throws 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.
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 of bytes, then the length of the Blob
value will be increased to accomodate the extra bytes.
Note: If the value specified for pos
is greater then the length+1 of the BLOB
value then the
behavior is undefined. Some JDBC drivers may throw a
SQLException
while other drivers may support this
operation.
pos
- the position in the BLOB
object at which
to start writing; the first position is 1bytes
- 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
SQLException
- if there is an error accessing the
BLOB
value or if pos is less than 1
SQLFeatureNotSupportedException
- if the JDBC driver does not support
this methodgetBytes(long, int)
OutputStream setBinaryStream(long pos) throws SQLException
BLOB
value that this Blob
object represents. The stream begins
at position pos
.
The bytes written to the stream 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 to the stream, then the length of the Blob
value will be increased to accomodate the extra bytes.
Note: If the value specified for pos
is greater then the length+1 of the BLOB
value then the
behavior is undefined. Some JDBC drivers may throw a
SQLException
while other drivers may support this
operation.
pos
- the position in the BLOB
value at which
to start writing; the first position is 1
java.io.OutputStream
object to which data can
be written
SQLException
- if there is an error accessing the
BLOB
value or if pos is less than 1
SQLFeatureNotSupportedException
- if the JDBC driver does not support
this methodgetBinaryStream()
void truncate(long len) throws SQLException
BLOB
value that this Blob
object represents to be len
bytes in length.
Note: If the value specified for pos
is greater then the length+1 of the BLOB
value then the
behavior is undefined. Some JDBC drivers may throw a
SQLException
while other drivers may support this
operation.
len
- the length, in bytes, to which the BLOB
value
that this Blob
object represents should be truncated
SQLException
- if there is an error accessing the
BLOB
value or if len is less than 0
SQLFeatureNotSupportedException
- if the JDBC driver does not support
this methodvoid free() throws SQLException
Blob
object and releases the resources that
it holds. The object is invalid once the free
method is called.
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.
SQLException
- if an error occurs releasing
the Blob's resources
SQLFeatureNotSupportedException
- if the JDBC driver does not support
this methodInputStream getBinaryStream(long pos, long length) throws SQLException
InputStream
object that contains a partial Blob
value,
starting with the byte specified by pos, which is length bytes in length.
pos
- the offset to the first byte of the partial value to be retrieved.
The first byte in the Blob
is at position 1length
- the length in bytes of the partial value to be retrieved
InputStream
through which the partial Blob
value can be read.
SQLException
- if pos is less than 1 or if pos is greater than the number of bytes
in the Blob
or if pos + length is greater than the number of bytes
in the Blob
SQLFeatureNotSupportedException
- if the JDBC driver does not support
this method