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Dokumen ini menggunakan Manual laman web PHP Cina Lepaskan
(PECL CUBRID >= 8.4.1)
cubrid_lob2_seek — Move the cursor of a lob object.
$lob_identifier
, int $offset
[, int $origin
= CUBRID_CURSOR_CURRENT
] )
The cubrid_lob2_seek() function is used to move the cursor
position of a lob object by the value set in the offset
argument, to the direction set in the origin
argument.
To set the origin
argument, you can use CUBRID_CURSOR_FIRST
to set the cursor position moving forward offset
units from
the first beginning. In this case, offset
must be a positive value.
If you use CUBRID_CURSOR_CURRENT for origin
, you can move
forward or backward. and offset
can be positive or negative.
If you use CUBRID_CURSOR_LAST for origin
, you can move
backward offset
units from the end of LOB object and
offset
only can be positive.
lob_identifier
Lob identifier as a result of cubrid_lob2_new() or get from the result set.
offset
Number of units you want to move the cursor.
origin
This parameter can be the following values:
CUBRID_CURSOR_FIRST: move forward from the first beginning.
CUBRID_CURSOR_CURRENT: move forward or backward from the current position.
CUBRID_CURSOR_LAST: move backward at the end of LOB object.
TRUE
if the process is successful and FALSE
for failure.
Example #1 cubrid_lob2_seek() example
<?php
// test_lob (id INT, contents CLOB)
$conn = cubrid_connect ( "localhost" , 33000 , "demodb" , "dba" , "" );
cubrid_execute ( $conn , "DROP TABLE if exists test_lob" );
cubrid_execute ( $conn , "CREATE TABLE test_lob (id INT, contents CLOB)" );
$req = cubrid_prepare ( $conn , "INSERT INTO test_lob VALUES(2, ?)" );
$lob = cubrid_lob2_new ( $conn , 'CLOB' );
$len = cubrid_lob2_write ( $lob , "Hello world" );
cubrid_lob2_seek ( $lob , 0 , CUBRID_CURSOR_LAST );
cubrid_lob2_write ( $lob , "beautiful" );
cubrid_lob2_seek ( $lob , 15 , CUBRID_CURSOR_FIRST );
$data = cubrid_lob2_read ( $lob , 5 );
echo $data . "\n" ;
cubrid_lob2_bind ( $req , 1 , $lob );
cubrid_execute ( $req );
cubrid_disconnect ( $conn );
?>