pg_cancel_query
(PHP 4 >= 4.2.0, PHP 5, PHP 7)
pg_cancel_query - 取消异步查询
描述
bool pg_cancel_query ( resource $connection )pg_cancel_query（）取消与pg_send_query（），pg_send_query_params（）或pg_send_execute（）一起发送的异步查询。您不能取消使用pg_query（）执行的查询。
参数
connection
PostgreSQL数据库连接资源。
返回值
成功返回TRUE或失败时返回FALSE。
例子
Example #1 pg_cancel_query() example
<?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);
?>上面的例子将输出：
First call to pg_get_result(): Resource id #3
Resource id #3 has 3 records← pg_affected_rows
pg_client_encoding →
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