Php/docs/function.cubrid-lob2-seek64

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• CUBRID 函数
• Move the cursor of a lob object

cubrid_lob2_seek64

(PECL CUBRID >= 8.4.1)

cubrid_lob2_seek64 — Move the cursor of a lob object

说明

cubrid_lob2_seek64 ( resource $lob_identifier , string $offset [, int $origin = CUBRID_CURSOR_CURRENT ] ) : bool

The cubrid_lob2_seek64() 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. If the offset you want to move is larger than an integer data can be stored, you can use this function.

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.

Note:

If you use this function to move the cursor position of the lob object, you should pass offset as a string.

参数

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.

返回值

true if the process is successful and false for failure.

范例

Example #1 cubrid_lob2_seek64() example

<?php// test_lob (id INT, contents CLOB)// Data length of doc_1.txt should be greater than 20101029056306120215.$conn = cubrid_connect("localhost", 33000, "demodb", "dba", "");cubrid_execute($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 (?, ?)");cubrid_bind($req, 1, 1);$lob = cubrid_lob2_new($conn, "clob");cubrid_lob2_import($lob, "doc_1.txt");cubrid_lob2_bind($req, 2, $lob, 'CLOB'); // or cubrid_lob2_bind($req, 2, $lob);cubrid_execute($req);cubrid_lob2_close($lob);$req = cubrid_execute($conn, "select * from test_lob");$row = cubrid_fetch_row($req, CUBRID_LOB);$lob = $row[1];cubrid_lob2_seek64($lob, "20101029056306120215", CUBRID_CURSOR_FIRST);$data = cubrid_lob2_read($lob, 20);echo $data."\n";cubrid_disconnect($conn);?>

参见

• cubrid_lob2_read() - Read from BLOB/CLOB data
• cubrid_lob2_write() - Write to a lob object
• cubrid_lob2_seek() - Move the cursor of a lob object
• cubrid_lob2_tell() - Tell the cursor position of the LOB object
• cubrid_lob2_tell64() - Tell the cursor position of the LOB object
• cubrid_lob2_size() - Get a lob object's size
• cubrid_lob2_size64() - Get a lob object's size