pg_lo_truncate

    (PHP 5 >= 5.6.0, PHP 7, PHP 8)

    pg_lo_truncate — Truncates a large object

    说明

    pg_lo_truncate(PgSql\Lob $lob, int $size): bool

    pg_lo_truncate() truncates an PgSql\Lob instance.

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

    参数

    lob

    通过 pg_lo_open() 返回的 PgSql\Lob 实例。

    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。

    更新日志

    版本 说明
    8.1.0 现在 lob 接受 PgSql\Lob 实例，之前接受 resource。

    示例

    示例 #1 pg_lo_truncate() example

    <?php
    $doc_oid     = 189762345;
    $database = pg_connect("dbname=jacarta");
    pg_query($database, "begin");
    $handle = pg_lo_open($database, $doc_oid, "r");
    // Truncate to 0
    pg_lo_truncate($handle, 0);
    pg_query($database, "commit");
    echo     $data;
    ?>

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