可能重复:
参考 - 这个错误在 PHP 中意味着什么?
我正在尝试使用 PHP 建立一个数据库,但我不断收到错误消息,说我在 id 中有一个未定义的索引。
我想将数据添加到我的数据库中,还能够更新、删除和显示信息。这是我的更新信息代码。
<?PHP
// Connection to MySQL
$dbconnection = @mysql_connect('localhost','root','');
if (!$dbconnection) {
echo '<p> Unable to connect to the database at this time.</br></br></p>';
exit();}
else {
echo '<p> connection to database is successful</br></br> </p>';}
//select Mysql Database-ijdb
if (!@mysql_select_db('disease')){
exit('<p> Unable to locate the information on the database.</p>');
}
//Receive Variables from the GET of JOKELIST.php
if(isset($_POST['submit']))
{
$GeneticOrganisation=$_POST['newGeneticOrganisation'];
$ProteinInformation=$_POST['newProteinInformation'];
$Symptoms=$_POST['newSymptoms'];
$Population=$_POST['newPopulation'];
$Cure=$_POST['newCure'];
$OriginOfDisease=$_POST['newOriginOfDisease'];
$dmdid=$_POST['id'];
// Print receieved variables to check accuracy
$sql= "UPDATE dmd SET GeneticOrganisation ='".$GeneticOrganisation."' WHERE id
`='".$dmdid."'";
$sql= "UPDATE dmd SET ProteinInformation ='".$ProteinInformation."' WHERE id ='".$dmdid."'";
$sql= "UPDATE dmd SET Symptoms ='".$Symptoms."' WHERE id ='".$dmdid."'";
$sql= "UPDATE dmd SET Population ='".$Population."' WHERE id ='".$dmdid."'";
$sql= "UPDATE dmd SET Cure ='".$Cure."' WHERE id ='".$dmdid."'";
$sql= "UPDATE dmd SET OriginOfDisease ='".$OriginOfDisease."' WHERE id ='".$dmdid."'";
}
if (!@mysql_query($sql))
echo "<p> Information could not be updated-".mysql_error();
else{
echo "<p> Information updated successfully";
echo '<a href="diseaseInfo.php"> View the information on the disease here.';
}
?>