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我正在使用INSERT語句添加記錄。現在我想檢查電子郵件是否已經註冊或已經存在於記錄..如果它已經存在只是給出一個錯誤，否則插入一個新的記錄..這是如何iam這樣做...但選擇查詢是沒有運行...並且仍然沒有檢查地添加記錄。請檢查我的代碼並請提出解決方案。謝謝:)這裏是我的在使用php插入sql之前檢查記錄
manage-users.php
<?php include("../includes/config.php"); ?>
<?php
if ($_SESSION["isadmin"])
{
?>
<!DOCTYPE HTML>
<html>
<head>
<?php include("includes/pre-header.php");?>
<title>Admdin Home</title>
</head>
<body>
<div class="container">
<?php include("includes/header.php"); ?>
<?php include("includes/nav.php"); ?>
<div id="maincontent">
<div class="span-24 last">
<div id="breadcrumbs">
<a href="">Home</a> >
<a href="">Manage Users</a> >
Add New
</div>
</div>
<?php include("includes/manage-users-aside.php"); ?>
<div class="span-18 last">
<h2 class="alt">Add New</h2>
<?php
if (isset($_GET["status"]))
{
if($_GET["status"]==1)
{
?>
<div class="success">
<?php
echo("<strong>User Has Been Added Successfully!</strong>");
?>
</div>
<?php
}
if($_GET["status"]==2)
{
?>
<div class="success">
<?php
echo("<strong>User Has Been Edited Successfully!</strong>");
?>
</div>
<?php
}
}
if($_GET["status"]==3)
{
echo ("<strong>This Account Already Exixts!. Please add a New One!</strong>");
}
?>
<form method="post" id="form" action="manage-users-action.php">
<label for="email">Email/Username:</label><input id="email" type="text" name="email" value="" class="text" /><br /><br />
<label for="password">Password:</label><input id="password" type="password" name="password" value="" class="text" /><br /><br />
<label for="firstname">First Name:</label><input id="firstname" type="text" name="firstname" value="" class="text" /><br /><br />
<label for="lastname">Last Name:</label><input id="lastname" type="text" name="lastname" value="" class="text" /><br /><br />
<label>Type:</label><br />
<input type="radio" name="type" value="S" />Student <br /> <br />
<input type="radio" name="type" value="T" />Teacher<br /><br />
<input type="submit" name="submit" value="Submit" class="button" />
</form>
</div>
</div>
<?php include("includes/footer.php"); ?>
</div>
</body>
</html>
<?php
}
else
{
header("Location: ".$fullpath."login/unauthorized.php");
}
?>
代碼，這是管理用戶，action.php的
<?php include("../includes/config.php");?>
<?php
$fname=$_POST['firstname'];
$lname=$_POST['lastname'];
$type=$_POST['type'];
$email=$_POST['email'];
$pwd=$_POST['password'];
$recoverykey=md5(time());
$encpwd=md5($pwd);
$con=mysql_connect($dbserver,$dbusername,$dbpassword);
if (!$con) { die('Could not connect: ' . mysql_error()); }
mysql_select_db($dbname, $con);
$result= mysql_query("SELECT FROM accounts WHERE (email='".$email."')");
if(!$result){
$sql=("INSERT INTO accounts VALUES (NULL,'".$email."','".$encpwd."','".$fname."','".$lname."','".$type."','".$recoverykey."')" );
}
else
{
header("Location: manage-uesrs.php?status=3");
}
if (!mysql_query($sql,$con))
{
die('Error: ' . mysql_error());
}
else
{
header("Location:manage-users.php?status=1");
}
mysql_close($con);
?>
爲什麼要先檢查？如果數據庫對該列有唯一約束，請嘗試插入，如果返回重複的索引錯誤，請在代碼中處理它。您可以保存到DB的旅程。 – xQbert
@xQBert，比答案，我會投它。 –
@AlainCollins我會，但它沒有解決具體的問題。這就是爲什麼我把它作爲評論。答案應該解決具體問題。我繞着路走了一圈;但我不認爲這是值得的，除非問題改變爲「插入記錄時處理重複項檢查的最佳方式是什麼」（我最好的方法是讓存儲過程完成工作並將內聯SQL刪除爲它打開了SQL注入的大門。）我只是想讓作者思考替代方法。 – xQbert