pg_cancel_query

(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)

pg_cancel_query — 取消异步查询

说明

pg_cancel_query(PgSql\Connection $connection): bool

pg_cancel_query() 取消由 pg_send_query()、pg_send_query_params() 或 pg_send_execute() 发送的异步查询。不能取消使用 pg_query() 执行的查询。

参数

connection

PgSql\Connection 实例。

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 connection 参数接受 PgSql\Connection 实例，之前接受 resource。

示例

示例 #1 pg_cancel_query() 示例

<?php
$dbconn = pg_connect("dbname=publisher") or die("Could not connect");

if (!pg_connection_busy($dbconn)) {
pg_send_query($dbconn, "select * from authors; select count(*) from authors;");
}

$res1 = pg_get_result($dbconn);
echo "First call to pg_get_result(): $res1\n";
$rows1 = pg_num_rows($res1);
echo "$res1 has $rows1 records\n\n";

// Cancel the currently running query. Will be the second query if it is
// still running.
pg_cancel_query($dbconn);
?>

以上示例会输出：

First call to pg_get_result(): Resource id #3
Resource id #3 has 3 records

参见