pg_get_result

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

pg_get_result — 取得异步查询结果

说明

pg_get_result(resource $connection = ?): resource

pg_get_result() 取得执行 pg_send_query() 而得到的查询结果资源。pg_send_query() 可以向 PostgreSQL 发送多个查询， pg_get_result() 则用来逐个得到查询结果。返回值为查询结果资源号。如果没有更多查询结果，则返回 false。

add a note

User Contributed Notes 4 notes

down

william at 25thandClement dot com ¶

17 years ago


There is no way to poll/wait for a notification to come in. You either have to enter a busy loop or sleep. Both options are horrible. It would be nice for PHP to provide access to PQsocket so one could select() on the socket connection. This is how it's done from C or Perl.

down

Ondej Bouda ¶

6 years ago


It might seem that after calling pg_get_result() upon sending just a single query, the connection will not be busy. The correct way is, though, to call extra pg_get_result() in a loop until it returns false [1].

<?php
$conn = pg_connect('...', PGSQL_CONNECT_FORCE_NEW);
for ($i = 0; $i < 10000; $i++) {
    $query = 'erroneous query';
    if (pg_connection_busy($conn)) {
        fprintf(STDERR, "Connection is busy\n");
        exit(1);
    }
    pg_send_query($conn, $query);
    $res = pg_get_result($conn);
    if ($res === false) {
        fprintf(STDERR, "A result was expected\n");
        exit(1);
    }

    /* The following does not seem necessary for good queries, but is vital for erroneous queries.
       Commenting the loop out leads to this script fail with the "Connection is busy" error. */
    while (pg_get_result($conn));

    // result processing...
}
?>

See http://www.postgresql.org/message-id/flat/gtitqq$26l3$1@news.hub.org#gtitqq$26l3$1@news.hub.org and https://bugs.php.net/bug.php?id=52750 for detailed information.

[1] Or, even better, use an asynchronous connection since PHP 5.6.

down

gullevek at gullevek dot org ¶

8 years ago


To have a a simple wait output with async queries you can use the pg_connection_busy command:

<?php
$dbh = pg_connect("host=XXX user=XXX password=XXX dbname=XXX");
if (!$dbh)
{
    print "Failed to connect";
    exit;
}

$query = "SELECT pg_sleep(10)";
if (!pg_connection_busy($dbh))
{
    $sent = pg_send_query($dbh, $query);
    print "Sent query, waiting: ";
    while (pg_connection_busy($dbh)
    {
        print ".";
        flush();
    }
    $res = pg_get_result($dbh);
    print "<br>"; // or \n
    print "Result is: $res";
}

pg_close($dbh);
?>

down

-4

Marko Tiikkaja ¶

13 years ago


william at 25thandClement dot com said: "There is no way to poll/wait for a notification to come in. .."
Yes, there is. If there is a query in progress, pg_get_result() will block and return the result of that query when it's complete.

add a note

官方地址：https://www.php.net/manual/en/function.pg-get-result.php

有任何技术问题请点击这里网站运营推广招聘

IT PHP 编程语言 Linux 开发编程科技 Elasticsearch HTML/CSS/XML 网络数据库 JAVA 面试 NoSQL C/C++ Golang Git 算法操作系统正则表达式 Redis 互联网 MySql JavaScript 运维软件国际架构设计 Mac OS TCP/IP Excel Vim Windows Socket Oracle VR MongoDB Python 运营 MemCache 商业硬件电子娱乐设计 nginx 摄影游戏 WordPress HTTP 团建数码电器

php7 安装fileinfo扩展 preg_split — 通过一个正则表达式分隔字符串 php位值,解决 PHP 中 usort 在值相同时改变原始位置的问题 [PHP] inet_pton/inet_ntop IP地址转换函数 PHP 8.1 [鸟哥]PHP_INT_MIN 和 -9223372036854775808 adodb手册 ADORecordSet对象 opcache预加载 Composer的Packagist资源 array_multisort() 多字段排序 PHPMailer设置utf8 PHPMailer字符集CharSet mysql面试题 PHP json解析（json_decode）页面工具 [原创]诡异的php-fpm超时问题 php中几种注释规范纯php实现DES以及TripleDES加密算法 php 修改图片大小支持php7的性能采集扩展利用PHP SOAP实现WEB SERVICE

略微加速

PHP官方手册 - 互联网笔记

pg_get_result

说明

User Contributed Notes 4 notes