更新查询更新不起作用答案

【问题标题】：Update query update not work更新查询更新不起作用
【发布时间】：2015-01-19 05:00:53
【问题描述】：

我在 Php 中进行添加、更新和删除操作。

一切正常，但我的更新查询不工作。

我能知道，我在更新查询中哪里出错了吗？

这是我的 update.php 文件代码..

<?php

include('connection.php'); 

$ID = $_REQUEST['Student_Id'];

$result = mysql_query("select* from tblstudent where Student_Id='".$ID."'");

while($oldvalue=  mysql_fetch_array($result))

{
    $oldname=$oldvalue['Student_Name'];
    $oldgender=$oldvalue['Gender'];
    $olddob=$oldvalue['DOB'];
    $oldaddress=$oldvalue['Address'];
    $oldmobileno=$oldvalue['Phone'];
    $olddivision=$oldvalue['Division'];
    $oldclass=$oldvalue['Class'];
    $oldemail=$oldvalue['Email_Id'];

}

if(isset ($_POST['submit']))
{

    $update = $_POST['submit'];

        if($update)
        {
            $newname=$_POST['Student_Name'];
            $newgender=$_POST['Gender'];
            $newdob=$_POST['DOB'];
            $newaddress=$_POST['Address'];
            $newmobileno=$_POST['Phone'];
            $newdivision=$_POST['Division'];
            $newclass=$_POST['Class'];
            $newemail=$_POST['Email_Id'];
    
          /* UPDATE QUERY */                        

           mysql_query("UPDATE tblstuent SET Student_Name='$newname', Gender='$newgender', DOB='$newdob', Address='$newaddress', Phone='$newmobileno', Division='$newdivision', Class='$newclass', Email_Id='$newemail'
                   WHERE id='$ID'");
            
            header('location:index.php');
        }
}

?>

<body>
         <form action="update.php" method="post">
                
                <fieldset>
                
                    <legend>Personal Information</legend><br/>   
                    
                    <div class="studentname"><label>Student Name :</label><input type="text" name="newstudentname" id="studentnameId" value="<?php echo $oldname ?>" placeholder="Enter Name" size="30px" /></div><br/>
                    
                    <div class="gender">
           
                         <label>Gender :</label>
                         
                         <input type="radio" name="type" value="Male" <?php echo ($oldgender == 'Male') ? 'checked' : ''; ?> />  Male
                         <input type="radio" name="type" value="Female" <?php echo ($oldgender == 'Female') ? 'checked' : ''; ?>/> Female<br />

                    </div> <br/>
                    
                    <div class="dob"><label>Date of Birth :</label><input type="text" name="dob" id="dobId" value="<?php echo $olddob ?>" placeholder="Enter DOB format Year-Month-DaY" size="30px" /></div><br/>
                    
                    <div class="address"><label class="addresschild">Address : </label><textarea rows="4" cols="21" name="address" id="addressId" value="" placeholder="Enter Your Address"><?php echo $oldaddress ?></textarea></div><br/>

                    <div class="mobileno"><label>Parent's Mobile No : </label><input type="text" name="mobileno" id="mobilenoId" value="<?php echo $oldmobileno ?>" placeholder="Enter Parent's Mobile No" size="30px" /></div><br/>
                    
                    <div class="selectdivision">
                        
                        <label>Divison :</label>

                        <select id="divisiondropdownId" name="divisiondropdown">
                            <option value="0">Select Division</option>
                            <option value="A"<?php if($olddivision=="A") echo 'selected="selected"'; ?> >A</option>
                            <option value="B"<?php if($olddivision=="B") echo 'selected="selected"'; ?> >B</option>
                            <option value="C"<?php if($olddivision=="C") echo 'selected="selected"'; ?> >C</option>
                        </select>
                        
                    </div><br/>
                    
                    <div class="selectclass">
                        
                        <label>Class :</label>
                        
                        <select id="classdropdownId" name="classdropdown">
                        
                            <option value="0">Select Class</option>
                            <option value="First"<?php if($oldclass=="First") echo 'selected="selected"'; ?>>First</option>
                            <option value="Second"<?php if($oldclass=="Second") echo 'selected="selected"'; ?>>Second</option>
                            <option value="Third"<?php if($oldclass=="Third") echo 'selected="selected"'; ?>>Third</option>
                            <option value="Fourth"<?php if($oldclass=="Fourth") echo 'selected="selected"'; ?>>Fourth</option>
                            <option value="Fifth"<?php if($oldclass=="Fifth") echo 'selected="selected"'; ?>>Fifth</option>
                            <option value="Sixth"<?php if($oldclass=="Sixth") echo 'selected="selected"'; ?>>Sixth</option>
                            <option value="Seventh"<?php if($oldclass=="Seventh") echo 'selected="selected"'; ?>>Seventh</option>
                            <option value="Eighth"<?php if($oldclass=="Eighth") echo 'selected="selected"'; ?>>Eighth</option>
                            <option value="Nineth"<?php if($oldclass=="Nineth") echo 'selected="selected"'; ?>>Nineth</option>
                            <option value="Tenth"<?php if($oldclass=="Tenth") echo 'selected="selected"'; ?>>Tenth</option>
                        
                        </select>
                        
                    </div><br/>
                    
                    
                    <div class="emailid"><label>Email-Id : </label><input type="text" name="emailid" id="emailId" value="<?php echo $oldemail ?>" placeholder="Enter your Email-id" size="30px" /></div><br/>
                   
                    
                    <div id="submit1">
                        
                        <input class="btnsubmit" type="submit" name="submit" id="submit" value="Submit" />
                        
                        <input class="btnreset" type="reset" name="reset" id="submit" value="Reset" />
                    
                    </div><br/>

                </fieldset>

            </form>
</body>

谢谢

拉胡尔驳船

【问题讨论】：

你得到什么错误？（用于错误报告使用：<?php error_reporting(E_ALL); ini_set("display_errors", 1); ?>）在更新语句中的列名周围也加上`
再次检查您的查询，它有一个错字tblstuent，应该是tblstudent
@Yohanes Khosiawan :- 谢谢，但现在更新查询也不起作用。
@Rizier123 :- 我没有收到任何错误。

标签： javascript php html mysql arrays

【解决方案1】：

除了拼写错误，你还用过

 $ID = $_REQUEST['Student_Id'];

在您的代码中，我没有在您的表单中找到任何 id 为“Student_Id”的元素，因此 $ID 中将没有任何值，并且不会进行任何更新。

【讨论】：

【解决方案2】：

试试这个：

Student_Name='$newname', 

put $newname in double quotes like this.

Student_Name="$newname",

【讨论】：

【解决方案3】：

很抱歉没有发表评论。我还没有50分。

我在您的查询中发现了一些错误。

表名。在选择查询中是tblstudent，在更新查询中是tblstuent
'$newname' 最好像这样连接。 '".$newname."'。这应该适用于所有变量。
您的代码中没有STUDENT_ID。所以将其添加为隐藏字段。
确保列名的拼写方式与表中相同。简单/大写和拼写。

【讨论】：

【解决方案4】：

如果您要更新同一张表，则应在下面的查询中传递 Student_Id 而不是 id，

 mysql_query("UPDATE tblstuent SET Student_Name='$newname', Gender='$newgender', DOB='$newdob', Address='$newaddress', Phone='$newmobileno', Division='$newdivision', Class='$newclass', Email_Id='$newemail'
                   WHERE id='$ID'");

或者你设置了错误的表名 tblstuent ，如果你更新同一张表，它应该是 tblstudent 。

【讨论】：

【解决方案5】：

在查询中检查所有列的数据类型，然后作为数据类型，如果数据类型如字符串、日期，则需要使用引号设置列值。否则不需要为良好的做法设置报价。在你的更新查询中你写错了表名，所以首先更新它。检查后

【讨论】：

【解决方案6】：

我有一个 PDO 示例，并为您准备了语句。另外，如果我是你，我会从准备好的语句开始学习 PDO。 MySQL 已被弃用，可能会给您带来麻烦。

此示例使用 Student_Id 作为自动增量和主要

SelectStudentPage.php

    <!DOCTYPE> 
    <html>

    <head>

    <title>Students</title>
    </head>
    <body>
<?php

$db_host = "localhost";
$db_username = "root";
$db_pass = "";
$db_name = "Studentsdb";

$db = new PDO('mysql:host='.$db_host.';dbname='.$db_name,$db_username,$db_pass);
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_WARNING);

    //prepared statement with PDO to query the database
    $stmt = $db->prepare("SELECT * FROM tblstudent ");
    $stmt->execute();

 ?>

    <?php //start of the while loop ?>
    <?php while( $row = $stmt->fetch(PDO::FETCH_ASSOC) ) { ?>

 <table border="1" style="table-layout: fixed; width: 1080px;">

    <br>
    <tr> 
        <th style="width:125px">STUDENT ID</th>
        <th style="width:125px">STUDENT NAME</th>
        <th style="width:100px">GENDER</th>
        <th style="width:100px">DOB</th>
        <th style="width:250px">ADDRESS</th>
        <th style="width:100px">PHONE</th>
        <th style="width:100px">DIVISION</th>
        <th style="width:100px">CLASS</th>
        <th style="width:250px">EMAIL ID</th>

    </tr>
    <tr style="width:25px">
    <?php $id = $row['Student_Id'];?>
    <?php echo  "<td> <a href='StudentUpdateForm.php?Student_Id=$id'>$id</a></td>"?>
        <td><?php echo $row['Student_Name']; ?></td>
        <td><?php echo $row['Gender']; ?></td>
        <td><?php echo $row['DOB']; ?></td>
        <td><?php echo $row['Address']; ?></td>
        <td><?php echo $row['Phone']; ?></td>
        <td><?php echo $row['Division']; ?></td>
        <td><?php echo $row['Class']; ?></td>
        <td><?php echo $row['Email_Id']; ?></td>

    </tr>

    </table>

      <?php } //end of the while loop?>
    </body>

</html>

StudentUpdateForm.php

<?php
$db_host = "localhost";
$db_username = "root";
$db_pass = "";
$db_name = "Studentsdb";

$db = new PDO('mysql:host='.$db_host.';dbname='.$db_name,$db_username,$db_pass);
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_WARNING);
    $id=$_GET['Student_Id'];
    $result = $db->prepare("SELECT * FROM tblstudent Where Student_Id=:Student_Id");
    $result->bindParam(':Student_Id', $id);
    $result->execute();
    for($i=0; $row = $result->fetch(); $i++){

?>
<!DOCTYPE>
<html>
<head>
    <title>Example Update Form</title>
</head>

<body>
    <form action="UpdateProcess.php" method="post">
        <legend>Personal Information</legend><br>
            <div>
            <label>Student Id :<label><input name="Student_Id" type="text" value=
            "<?php print($row['Student_Id']) ?>">
        </div><br>
        <div>
            <label>Student Name :</label><input name="Student_Name" type="text" value=
            "<?php print($row['Student_Name']) ?>">
        </div><br>

        <div>
            <label>Gender :</label>
            <select name ="Gender" style="width: 149px" >
                <option value <?php if ($row['Gender']==1){ print('selected');}  ?> ="Male">Male</option>
                <option value <?php if ($row['Gender']==2){ print('selected');}  ?> ="Female">Female</option>
            </select>
        </div><br>

        <div>
            <label>Date of Birth :</label><input name="DOB" type="text" value=
            "<?php print($row['DOB']) ?>">
        </div><br>

        <div>
            <label>Address :</label><textarea name="Address"><?php echo $row['Address']; ?></textarea><br>
        </div><br>

        <div>
            <label>parents mobile no:</label><input name="Phone" type="text"value=
            "<?php print($row['Phone']) ?>">
        </div><br>

        <div>
            <label>Divison :</label><br>
            <select name ="Division" style="width: 149px" >
                <option value <?php if ($row['Division']==1){ print('selected');}  ?> ="A">A</option>
                <option value <?php if ($row['Division']==2){ print('selected');}  ?> ="B">B</option>
                <option value <?php if ($row['Division']==3){ print('selected');}  ?> ="C">C</option>
        </select>
        </div><br>

        <div>
            <label>Class :</label><br>
             <select name ="Class" style="width: 149px" >
                <option value <?php if ($row['Class']==1){ print('selected');}  ?> ="First">First</option>
                <option value <?php if ($row['Class']==2){ print('selected');}  ?> ="Second">Second</option>
                <option value <?php if ($row['Class']==3){ print('selected');}  ?> ="Third">Third</option>
            </select>
        </div><br>

        <div>
            <label>Email id :</label><input name="Email_Id" type="text" value=
            "<?php print($row['Email_Id']) ?>">
        </div><br>

        <div id="submit1">
            <input class="btnsubmit" id="submit" name="submit" type="submit"
            value="Update"> <input class="btnreset" id="submit" name="reset"
            type="reset" value="Reset">
        </div><br>

    </form>
</body>
</html>
<?php } ?>

UpdateProcess.php

<?php
$db_host = "localhost";
$db_username = "root";
$db_pass = "";
$db_name = "Studentsdb";
try{
$db = new PDO('mysql:host='.$db_host.';dbname='.$db_name,$db_username,$db_pass);
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_WARNING);

$sql = 'UPDATE tblstudent SET Student_Id=:Student_Id, Student_Name=:Student_Name, Gender=:Gender, DOB=:DOB, Address=:Address, Phone=:Phone, Division=:Division, Class=:Class, Email_Id=:Email_Id WHERE Student_Id=:Student_Id';
$stmt = $db->prepare($sql);  
$stmt->bindParam(':Student_Id', $_POST['Student_Id'], PDO::PARAM_STR);  
$stmt->bindParam(':Student_Name', $_POST['Student_Name'], PDO::PARAM_STR);       
$stmt->bindParam(':Gender', $_POST['Gender'], PDO::PARAM_STR); 
$stmt->bindParam(':DOB', $_POST['DOB'], PDO::PARAM_STR);   
$stmt->bindParam(':Address', $_POST['Address'], PDO::PARAM_STR);
$stmt->bindParam(':Phone', $_POST['Phone'], PDO::PARAM_STR);    
$stmt->bindParam(':Division', $_POST['Division'], PDO::PARAM_STR);
$stmt->bindParam(':Class', $_POST['Class'], PDO::PARAM_STR);
$stmt->bindParam(':Email_Id', $_POST['Email_Id'], PDO::PARAM_STR);

$stmt->execute();
echo $stmt->rowCount()  .  " record Updated successfully.";
}catch(PDOException $exception){ 
            echo "Error: " . $exception->getMessage();
    }   
echo "<a href=http://localhost/students/SelectStudentPage.php>Go to Grid view Results page</a>";
?>

【讨论】：

【解决方案7】：

    $sql = "SELECT * FROM table WHERE id = '$id' " ;

   while($oldvalue=  mysql_fetch_array($result))

{
    $oldname=$oldvalue['Student_Name'];
    $oldgender=$oldvalue['Gender'];
    $olddob=$oldvalue['DOB'];
    $oldaddress=$oldvalue['Address'];
    $oldmobileno=$oldvalue['Phone'];
    $olddivision=$oldvalue['Division'];
    $oldclass=$oldvalue['Class'];
    $oldemail=$oldvalue['Email_Id'];

}



    if(mysql_query("DESCRIBE `table`")) {

                $sql = "UPDATE table SET ";
                $sql.= " Student_Name = '$oldname', Gender = '$oldgender',.... ";
                $sql.= " WHERE id = '$id' ";

        if(mysql_query($sql)){
           echo 'Good';
        }    
        else 
        {
        echo 'Bad';
        }
    }

试试这样的；）

【讨论】：

【解决方案8】：

你好朋友谢谢你，

您的所有回答都帮助我解决了问题。

我从你们那里学到了很多。

最后我解决了上述问题，对 update.php 文件代码进行了一些更改..

这是我的新代码

<?php

include('connection.php'); 

if(isset ($_REQUEST['Student_Id']))
{
    $id = $_REQUEST['Student_Id'];
    
    $result = mysql_query("select* from tblstudent where Student_Id ='".$id."'");
    
    while($oldvalue=  mysql_fetch_array($result))
    {

    $oldid = $oldvalue['Student_Id'];
    $oldname=$oldvalue['Student_Name'];
    $oldgender=$oldvalue['Gender'];
    $olddob=$oldvalue['DOB'];
    $oldaddress=$oldvalue['Address'];
    $oldmobileno=$oldvalue['Phone'];
    $olddivision=$oldvalue['Division'];
    $oldclass=$oldvalue['Class'];
    $oldemail=$oldvalue['Email_Id'];

    }   
}

if(isset ($_POST['newname']))
{

            $newname =$_POST['newname'];
            
            $newid =$_POST['newid'];
            
            $newgender =$_POST['newgender'];
            
            $newdob = $_POST['newdob'];
            
            $newaddress = $_POST['newaddress'];
            
            $newphone = $_POST['newphone'];
            
            $newdivision = $_POST['newdivision'];
            
            $newclass = $_POST['newclass'];
            
            $newemailid = $_POST['newemailid'];
            
            $sql= "UPDATE tblstudent SET Student_Name='$newname', Gender='$newgender', DOB='$newdob', Address='$newaddress', Phone='$newphone', Division='$newdivision', Class='$newclass', Email_Id='$newemailid' WHERE Student_Id='$newid'";
            
            $result= mysql_query($sql);
            
            header('location:index.php');

}

?>



<body>
         <form action="update.php" method="post">
                
                <fieldset>
                
                    <legend>Personal Information</legend><br/>
                    
                    <div class="studentname"><label>Student Name :</label><input type="text" name="newname" id="studentnameId" value="<?php echo $oldname ?>" placeholder="Enter First & Last Name" size="30px" /></div><br/>
                    
                    <input type="hidden" name="newid" value="<?php echo $oldid ?>"/>
                    
                    <div class="gender">
           
                         <label>Gender :</label>
                         
                         <input type="radio" name="newgender" value="Male" <?php echo ($oldgender == 'Male') ? 'checked' : ''; ?> />  Male
                         <input type="radio" name="newgender" value="Female" <?php echo ($oldgender == 'Female') ? 'checked' : ''; ?>/> Female<br />


                    </div> <br/>
                    
                    <div class="dob"><label>Date of Birth :</label><input type="text" name="newdob" id="dobId" value="<?php echo $olddob ?>" placeholder="Enter DOB format Year-Month-DaY" size="30px" /></div><br/>
                    
                    <div class="address"><label class="addresschild">Address : </label><textarea rows="4" cols="21" name="newaddress" id="addressId" value="" placeholder="Enter Your Address"><?php echo $oldaddress ?></textarea></div><br/>

                    <div class="mobileno"><label>Parent's Mobile No : </label><input type="text" name="newphone" id="mobilenoId" value="<?php echo $oldmobileno ?>" placeholder="Enter Parent's Mobile No" size="30px" /></div><br/>
                    
                    <div class="selectdivision">
                        
                        <label>Divison :</label>

                        <select id="divisiondropdownId" name="newdivision">
                            <option value="0">Select Division</option>
                            <option value="A"<?php if($olddivision=="A") echo 'selected="selected"'; ?> >A</option>
                            <option value="B"<?php if($olddivision=="B") echo 'selected="selected"'; ?> >B</option>
                            <option value="C"<?php if($olddivision=="C") echo 'selected="selected"'; ?> >C</option>
                        </select>
                        
                        
                        
                    </div><br/>
                    
                    <div class="selectclass">
                        
                        <label>Class :</label>
                        
                        <select id="classdropdownId" name="newclass">
                        
                            <option value="0">Select Class</option>
                            <option value="First"<?php if($oldclass=="First") echo 'selected="selected"'; ?>>First</option>
                            <option value="Second"<?php if($oldclass=="Second") echo 'selected="selected"'; ?>>Second</option>
                            <option value="Third"<?php if($oldclass=="Third") echo 'selected="selected"'; ?>>Third</option>
                            <option value="Fourth"<?php if($oldclass=="Fourth") echo 'selected="selected"'; ?>>Fourth</option>
                            <option value="Fifth"<?php if($oldclass=="Fifth") echo 'selected="selected"'; ?>>Fifth</option>
                            <option value="Sixth"<?php if($oldclass=="Sixth") echo 'selected="selected"'; ?>>Sixth</option>
                            <option value="Seventh"<?php if($oldclass=="Seventh") echo 'selected="selected"'; ?>>Seventh</option>
                            <option value="Eighth"<?php if($oldclass=="Eighth") echo 'selected="selected"'; ?>>Eighth</option>
                            <option value="Nineth"<?php if($oldclass=="Nineth") echo 'selected="selected"'; ?>>Nineth</option>
                            <option value="Tenth"<?php if($oldclass=="Tenth") echo 'selected="selected"'; ?>>Tenth</option>
                        
                        </select>
                        
                    </div><br/>
                    
                    
                    <div class="emailid"><label>Email-Id : </label><input type="text" name="newemailid" id="emailId" value="<?php echo $oldemail ?>" placeholder="Enter your Email-id" size="30px" /></div><br/>
                   
                    
                    <div id="submit1">
                        
                        <input class="btnsubmit" type="submit" name="submit" id="submit" value="Submit" />
                        
                        <input class="btnreset" type="reset" name="reset" id="submit" value="Reset" />
                    
                    </div><br/>

                </fieldset>

            </form>
</body>

谢谢你:-)

【讨论】：