我无法使 $dbh1 可用于所有需要它进行查询的 php 文件。我尝试在运行查询的文件中使用“global $dbh1”。
我有 4 个文件：testswitchDB3.php(main)、testconnect.php、login.php 和 testnumcards.php
一旦数据库通过 login.php 和 testconnect.php 运行连接。两个文件都在工作
因此，通过将“global $dbh1”应用于testnumcards.php，可以创建并使用$dbh1。
但它不起作用。以下是我的代码。
testswitchDB3.php
<!DOCTYPE html>
<html>
<head>
<title>Test the switching responses between databases using buttons</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<link rel="stylesheet" href="../dojo1_8/dijit/themes/soria/soria.css"/>
<link rel="stylesheet" href="../common.css"/>
<style type="text/css">
html, body
{
width: 100%;
height: 100%;
margin: 5px;
padding: 0px;
overflow: hidden; /* No Scrollbar */
}
</style>
<script>
var dojoConfig =
{
parseOnLoad: true,
isDebug: true,
async: true,//
locale : "en-us"//
};
</script>
<script src='../dojo1_8/dojo/dojo.js'></script>
</head>
<body class="soria">
<div id="main_bContainer" data-dojo-type="dijit.layout.BorderContainer" data-dojo-props="design:'sidebar'">
<div id="cp_Center" data-dojo-type="dijit/layout/ContentPane" data-dojo-props="region:'center'">
<table>
<tr>
<td>
<div id=btn1></div><!--for testdata2060_03-->
</td>
<td>
<div id=btn2></div><!--for testdata2060_10-->
</td>
<td>
<div id=btn3></div><!--for testdata2060_05-->
</td>
</tr>
<tr>
<td>
<div id=btn4></div><!--for testdata2060_03-->
</td>
<td>
<div id=btn5></div><!--for testdata2060_10-->
</td>
<td>
<div id=btn6></div><!--for testdata2060_05-->
</td>
</tr>
<tr>
<td>
<div id=btn7></div><!--for testdata2060_03-->
</td>
<td>
<div id=btn8></div><!--for testdata2060_10-->
</td>
<td>
<div id=btn9></div><!--for testdata2060_05-->
</td>
</tr>
</table>
<div id=statement></div>
</div><!--cp_Center-->
</div><!--main_bContainer-->
<script>
require(["dojo/parser", "dijit/layout/BorderContainer", "dijit/form/Button",
"dojo/on", "dijit/form/Select", "dojo/store/Memory", "dojo/request",
"dojo/dom", "dojo/dom-construct", "dojo/domReady!"],
function(parser, BorderContainer, Button, on, Select, Memory, request, dom,
domConstruct)
{var commonDB = "nameless"; function connect(commonDB)
{request.post("testconnect.php",
{data:{nameDB : commonDB}
//,handleAs:"json"//without the use of "handleAs:JSON" as it needs only
confirnation or not
}).then
(function(connect)
{console.debug("data read as: ", connect);
if(connect)//as true or false as indicated in login.php
{alert("Successfully login and connected");
switch(commonDB)
{
case 'testdata2060_03':
btn4.set('disabled', false);
btn5.set('disabled', true);
btn6.set('disabled', true);
btn7.set('disabled', false);
btn8.set('disabled', true);
btn9.set('disabled', true);
break;
case 'testdata1970_11':
btn4.set('disabled', true);
btn5.set('disabled', false);
btn6.set('disabled', true);
btn7.set('disabled', true);
btn8.set('disabled', false);
btn9.set('disabled', true);
break;
case 'testdata1970_05':
btn4.set('disabled', true);
btn5.set('disabled', true);
btn6.set('disabled', false);
btn7.set('disabled', true);
btn8.set('disabled', true);
btn9.set('disabled', false);
break;
}}
else
alert("Attempt to login and connect is NOT successful");
},
(
function(error)
{
alert("Test's Error:"+error);
console.debug(error);
}
);
}
function card(commonDB)
{request.post("testnumcards.php",
{
//{data:{xxx:yyy},
handleAs: "json"
}).then
(function(response)
{alert("The number of the distinct catds for "+commonDB+" is "+response);
dom.byId("statement").innerHTML = "The number of the distinct catds for
"+commonDB+" is "+response;
},
function(error)
{alert("Test's Error:"+error);
console.debug(error);
}
)}
/*
function test()
{
}
*/
var btn1 = new Button // Button, not button
({ label: "testdata2060_03",
onClick: function()
{
console.log("Console Log: Button1 has been clicked.");
connect('testdata2060_03');
}
},"btn1");
btn1.startup();
var btn2 = new Button
({label: "testdata1970_11"
},"btn2");
btn2.startup();
var btn3 = new Button
({label: "testdata1970_05"
},"btn3");
btn3.startup();
var btn4 = new Button // Button, not button
({label: "Number of cards",
disabled: true
},"btn4");
btn4.startup();
var btn5 = new Button
({label: "Number of cards",
disabled: true
},"btn5");
btn5.startup();
var btn6 = new Button
({label: "Number of cards",
disabled: true
},"btn6");
btn6.startup();
var btn7 = new Button // Button, not button
({label: "Number of tests",
disabled: true
},"btn7");
btn7.startup();
var btn8 = new Button
({label: "Number of tests",
disabled: true
},"btn8");
btn8.startup();
var btn9 = new Button
({label: "Number of tests",
disabled: true
},"btn9");
btn9.startup();
/*on(btn1, 'click', function()
{console.log("Console Log: Button1 has been clicked.");
connect('testdata2060_03');
});
*/
on(btn2, 'click', function()
{console.log("Console Log: Button2 has been clicked.");
connect('testdata1970_11');
});
on(btn3, 'click', function()
{console.log("Console Log: Button3 has been clicked.");
connect('testdata1970_05');
});
on(btn4, 'click', function()
{console.log ("Console Log: Button4 has been clicked.");
card();
});
on(btn5, 'click', function()
{console.log("Console Log: Button5 has been clicked.");
test();
});
on(btn6, 'click', function()
{console.log("Console Log: Button6 has been clicked.");
card();
});
on(btn7, 'click', function()
{console.log("Console Log: Button7 has been clicked.");
test();
});
on(btn8, 'click', function()
{console.log("Console Log: Button8 has been clicked.");
card();
});
on(btn9, 'click', function()
{console.log("Console Log: Button9 has been clicked.");
test();
});
});
</script>
</body>
接下来是testconnect.php
<?php
global $dbh1;
$dbname = $_POST['nameDB'];
require_once '../scripts/login.php';
echo $connect;
?>
接下来是 login.php
<?php
global $dbname;
global $dbh1;
$dbh1 = null;
$dsn ="mysql:host=localhost; dbname=$dbname";
$user ='root';
$pswd ='';
try
{
$dbh1 = new PDO($dsn, $user, $pswd, array(PDO::ATTR_TIMEOUT => "10",// 10 seconds
PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION)); // connect to DB, declared as global variable!
$connect = TRUE;
}
catch(PDOException $err)
{
$alertmsg = $err->getMessage();
$connect = FALSE;
}
echo $connect;
?>
接下来是 testnumcards.php
<?php
global $dbh1;
$stmt = $dbh1->prepare("select count(distinct mfg_code)as mfg_code from test");
try
{
$stmt->execute();
}
catch(PDOException $err)
{
$alertmsg = $err->getMessage();
}
$num = $stmt->fetch(PDO::FETCH_ASSOC);
echo $num['mfg_code'];
?>
您可以参考JsFiddle以供参考，尽管它不能在没有 PHP 支持的情况下使用。