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Updating Data into MySQL Database

Updating Data into MYSQL Database

Hello folks! welcome back to a new section of our tutorial on PHP. In this section of our PHP tutorial, we will be studying about how to Update Data into MySQL Database.

Data can be updated into MySQL tables by executing SQL UPDATE statement making use of PHP mysql_query function.

The following below is a simple example to update records into employee table. In order to update a record in any table, it is required to locate that record by using a conditional clause. The below example uses a primary key to match a record in employee table.


Try the following example below to have a proper understanding of update operation. You need to give an employee ID to update an employee salary.

      <title>Update a Record in MySQL Database</title>
         if(isset($_POST['update'])) {
            $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'];
            $emp_salary = $_POST['emp_salary'];
            $sql = "UPDATE employee ". "SET emp_salary = $emp_salary ". 
               "WHERE emp_id = $emp_id" ;
            $retval = mysql_query( $sql, $conn );
            if(! $retval ) {
               die('Could not update data: ' . mysql_error());
            echo "Updated data successfully\n";
         }else {
               <form method = "post" action = "<?php $_PHP_SELF ?>">
                  <table width = "400" border =" 0" cellspacing = "1" 
                     cellpadding = "2">
                        <td width = "100">Employee ID</td>
                        <td><input name = "emp_id" type = "text" 
                           id = "emp_id"></td>
                        <td width = "100">Employee Salary</td>
                        <td><input name = "emp_salary" type = "text" 
                           id = "emp_salary"></td>
                        <td width = "100"> </td>
                        <td> </td>
                        <td width = "100"> </td>
                           <input name = "update" type = "submit" 
                              id = "update" value = "Update">

Alright guys! This is where we are rounding up for this tutorial post. In our next tutorial guide, we are going to be discussing about how to Delete Data from MySQL Database using PHP.

Feel free to ask your questions where necessary and we will attend to them as soon as possible. If this tutorial was helpful to you, you can use the share button to share this tutorial.

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