I just start coding in PHP, i wrote my first php + mysql program for inserting data through web form. it works fine, but whenever i refresh the page, it automatically saves null record to my database. i know the solution in .NET is ispostback, but not in php? can somebody give me some idea in PHP.
Code is here:
<body>
<form action="mySQLTest.php" method="post">
First Name :<input type="text" name ="txtFirstName"/> <br/>
Last Name: <input type="text" name ="txtLastName"/> <br/>
Age : <input type="text" name= "txtAge" /> <br/>
<input type="submit"/>
</form>
<?php
$con = mysql_connect("localhost","root","");
if(!$con)
{
die('Could not Connect:' .mysql_error());
}
mysql_select_db("test", $con);
if($_REQUEST[])
{
$sql1 = "Insert into info(FirstName, LastName, Age) Values('$_POST[txtFirstName]','$_POST[txtLastName]','$_POST[txtAge]')";
}
if(!mysql_query($sql1, $con))
{
die('Error: '.mysql_error());
}
else
{
echo "1 Record Added";
}
mysql_close($con)
?>
</body>
Have you tried if ($_SERVER['REQUEST_METHOD']=='POST')
updated answer:
if ($_SERVER['REQUEST_METHOD']=='POST') {
[insert...]
header('Location: added_record.php');
}
When you use the POST-method, it's better (imho) to use $_POST rather than $_REQUEST. To check whether you have data, you could use isset($_POST['txtFirstName']);. If you need all data, it's best to do this for all input fields, resulting in
if(isset($_POST['txtFirstName']) && isset($_POST['txtLastName']) && isset($_POST['txtAge'])) {
// do stuff
}
If you want to know if there was any field submitted using post, you could use if(!empty($_POST)) {.
On a side note: I know you are just starting PHP, it could be quite dangerous to use user-generated code in queries. When you are building stuff online, for everyone to reach, please read a bit about SQL injection. This will also prevent your code from breaking when someone enters an apostrophe (').