Deleting Data from MySQL Database


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Data can be deleted from MySQL tables by executing SQL DELETE statement through PHP function mysql_query.

Below is a simple example to delete records into employee table. To delete a record in any table it is required to locate that record by using a conditional clause. Below example uses primary key to match a record in employee table.

Example

Try out following example to understand delete operation. You need to provide an employee ID to delete an employee record from employee table.

<html>
   
   <head>
      <title>Delete a Record from MySQL Database</title>
   </head>
   
   <body>
      <?php
         if(isset($_POST['delete']))
         {
            $dbhost = 'localhost:3036';
            $dbuser = 'root';
            $dbpass = 'rootpassword';
            $conn = mysql_connect($dbhost, $dbuser, $dbpass);
            
            if(! $conn )
            {
               die('Could not connect: ' . mysql_error());
            }
				
            $emp_id = $_POST['emp_id'];
            
            $sql = "DELETE employee ". "WHERE emp_id = $emp_id" ;
            mysql_select_db('test_db');
            $retval = mysql_query( $sql, $conn );
            
            if(! $retval )
            {
               die('Could not delete data: ' . mysql_error());
            }
            
            echo "Deleted data successfully\n";
            
            mysql_close($conn);
         }
         else
         {
            ?>
               <form method="post" action="<?php $_PHP_SELF ?>">
                  <table width="400" border="0" cellspacing="1" cellpadding="2">
                     
                     <tr>
                        <td width="100">Employee ID</td>
                        <td><input name="emp_id" type="text" id="emp_id"></td>
                     </tr>
                     
                     <tr>
                        <td width="100"> </td>
                        <td> </td>
                     </tr>
                     
                     <tr>
                        <td width="100"> </td>
                        <td>
                           <input name="delete" type="submit" id="delete" value="Delete">
                        </td>
                     </tr>
                     
                  </table>
               </form>
            <?php
         }
      ?>
      
   </body>
</html>

php_and_mysql.htm