pg_send_query

说明

例子，用于异步查询

pg_send_query

(PHP 4 >= 4.2.0)

pg_send_query -- 发送异步查询

说明

bool pg_send_query ( resource connection, string query)

bool pg_send_query ( string query)

pg_send_query() 向 connection 连接发送异步查询。和 pg_query() 不同，它可以向 PostgreSQL 发送多个查询并用 pg_get_result() 依次得到结果。当执行查询时脚本的执行不会被锁定。用 pg_connection_busy() 来检查连接连接是否为忙（即查询正在执行中）。调用 pg_cancel_query() 则有可能取消查询。

尽管用户可以一次发送多个查询，但用户不能通过正忙的连接发送多个查询。如果向正忙的连接发送了查询，则会等待上一条查询结束并丢弃所有结果。

例子，用于异步查询

<?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\";

$rows1 = pg_num_rows($res1);

echo "$res1 has $rows1 records\\";

$res2 = pg_get_result($dbconn);

echo "second call to pg_get_result(): $res2\";

$rows2 = pg_num_rows($res2);

echo "$res2 has $rows2 records\";

?>

上例输出如下：

first call to pg_get_result(): Resource id #3Resource id #3 has 3 records second call to pg_get_result(): Resource id #4 Resource id #4 has 1 records