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PHP:pg_lo_truncate()的用法_PostgreSQL函数

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pg_lo_truncate

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pg_lo_truncate — Truncates a large object

说明 bool pg_lo_truncate ( resource $large_object , int $size )

pg_lo_truncate() truncates a large object resource.

To use the large object interface, it is necessary to enclose it within a transaction block.

参数

large_object PHP:pg_lo_truncate()的用法_PostgreSQL函数

PostgreSQL large object (LOB) resource, returned by pg_lo_open().

size

The number of bytes to truncate.

返回值

成功时返回 TRUE，或者在失败时返回 FALSE。

范例

Example #1 pg_lo_truncate() example

<?php$doc_oid=;$database=pg_connect("dbname=jacarta");pg_query($database,"begin");$handle=pg_lo_open($database,$doc_oid,"r");//Truncateto0pg_lo_truncate($handle,0);pg_query($database,"commit");echo$data;?>

更新日志

版本说明 5.6.0 Added truncate function. It supports PostgreSQL 9.3&#;s bit large object. Both client and server must support PostgreSQL 9.3 and PHP must be bit build to use bit large object.

参见

pg_lo_tell() - 返回大型对象的当前指针位置

PHP:pg_lo_seek()的用法_PostgreSQL函数 pg_lo_seek(PHP4=4.2.0,PHP5)pg_lo_seek移动大型对象中的指针说明boolpg_lo_seek(resource$large_object,int$offset[,int$whence])pg_lo_seek()在大型对象资源中移动指针位置。whence参

PHP:pg_lo_read()的用法_PostgreSQL函数 pg_lo_read(PHP4=4.2.0,PHP5)pg_lo_read从大型对象中读入数据说明stringpg_lo_read(resource$large_object,int$len)pg_lo_read()从大型对象中读入最多len字节的数据并以字符串返

PHP:pg_lo_open()的用法_PostgreSQL函数 pg_lo_open(PHP4=4.2.0,PHP5)pg_lo_open打开一个大型对象说明resourcepg_lo_open(resource$connection,int$oid,string$mode)pg_lo_open()打开一个大型对象并返回大型对象资源号。该

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