php - 为什么这个查询会失败？

Question

<?php

$connect = pg_connect("dbname=$dbase host=".$host." user=".$user." password=".$pass) or die("I sense a disturbance in the force ");

$action = $_POST['action'];

switch($action){
case 'bagSubmit' : bagSubmit(); break;
}

function bagSubmit(){
    $sql = 'SELECT * FROM cntrt';
    $query = pg_query($connect,$sql) or die('could not connect');
}
?>

上面的 php 返回“无法连接”。sql 查询在数据库中执行良好。这是我在 php 中执行查询的正常程序（以前一直有效）。现在唯一的区别是我从 jquery 调用 php。jquery 也执行得很好，这可以从返回查询失败（“无法连接”）的事实中得到证明。我错过了什么？

$.ajax({
    url: 'functions.php',
data: {action: 'bagSubmit'},
type: 'post',
success: function(response){
    $('body').append(response);
}
});

Answer 1

$connect 未定义。你需要

function bagSubmit(){
    global $connect;
    $sql = 'SELECT * FROM cntrt';
    $query = pg_query($connect,$sql) or die('could not connect');
}

Answer 2

<?php
    $host = "10.10.10.129";
    $user = "postgres";
    $pass = "";
    $dbase = "attest";
    $connect = pg_connect("dbname=$dbase host=".$host." user=".$user." password=".$pass) or die("I sense a disturbance in the force ");

    $action = $_POST['action'];

    switch($action){
        case 'bagSubmit' : 
            bagSubmit($connect); 
            break;
    }

    function bagSubmit($connect){
        $sql = 'SELECT * FROM cntrt';
        $query = pg_query($connect,$sql) or die('could not connect');
    }
?>

Answer 3

而不是使用全局变量，只需将$connect对象传递给您的函数：

function bagSubmit($connect){
    $sql = 'SELECT * FROM cntrt';
    $query = pg_query($connect,$sql) or die('could not connect');
}

并这样称呼它：

bagSubmit($connect);