Check database if already exists

[london-G]

Hi guys. I am now creating my sign up page and I would like to check if both name and email entered in page are already in the database.

So far I have

if(mysql_query("SELECT members FROM name WHERE $_POST['name'] = '$name' and email WHERE $_POST['email'] = '$email'" ))){

echo "Sorry! Your details are already in our database";

} else {
// code to insert values into databases.....

I have a problem with the top part. I refered $_POST as name entered as I gave it id name "name" on the form. When I run it it say programminn error.

"SELECT `members` FROM `name` WHERE `name` = '$name' AND `email` WHERE `email` = '$email'"

I assume you've made $name and $email from $_POST and $_POST and have cleaned them with something like mysql_real_escape_string().

I also assume that the table name is 'name' and that you have a field called 'name' too.

[london-G]

Sorry for the confusion, I have the table named members and the fileds names email and name. I did made $name and $email from $_POST and $_POST.

My code is

if (mysql_query("SELECT * FROM members WHERE 'name' = '$name' AND 'email' = '$email'")){
			   
			   echo "Sorry! Your details are already in our database";
			   
			   } else {
// code to insert values into databases.....

Now it is only inserting the values of name and email into the database even though the database has the same values already.

$r = mysql_query("SELECT `name` FROM `members` WHERE `name` = '$name' AND `email` = '$email' LIMIT 1");
if(mysql_num_rows($r)>0){
  //record found
}else{
  //record not found
}

You MUST use backticks for field names as opposed to normal single quotes. Also don't use * in your query as it's slow. Best to pick one field if you want to see if a record is present. If you use LIMIT 1 - the query stops searching the rest of the DB as soon as it gets one result - saving time.

The mysql_num_rows() is the standard way to check if a resource has any records in it. You could also use if(mysql_num_rows($r)){} or if(!mysql_num_rows($r)){}, but I think the one I supplied illustrates the use.

[london-G]

Thanks for the advise. I did change my code now but still not working. I have posted my full code now

// table name
$tbl_name="members";

$name=$_POST['name'];
$email=$_POST['email'];


$exist = mysql_query("SELECT 'name' FROM members WHERE 'name' = '$name' AND 'email' = '$email'")

if (mysql_num_rows($exist)>0) {
			   
			   echo "Sorry! Your details are already in our database";
			   
			   } else {

// Insert data into database
$sql = "INSERT INTO $tbl_name VALUES('$name','$email')";
			  
			   
$result=mysql_query($sql);
 }

// if suceesfully
if($result){
echo "Success!";
}

$name=mysql_real_escape_string($_POST['name']);
$email=mysql_real_escape_string($_POST['email']);

Where's your connection details? You don't seem to have connected to a DB.

[london-G]

Sorry I forgot to post the connection bit. I did changed

$name=mysql_real_escape_string($_POST['name']);$email=mysql_real_escape_string($_POST['email']);

but still doesn't work.

It keeps saying success (adds to database too) even though I have inserted the same name and address thousand times already :(.

[pzuurveen]

you are still not using backticks as ardav told you to
` is diverend than '
` is on the same key as the ~ ( atleast on my keyboard)

or you can copy and past ardav code

[london-G]

I really feel stupid lol. Sorry ardav I missed your point here. It works now. Thank you so much!