Question

Possible Duplicate:
“INSERT IGNORE” vs “INSERT … ON DUPLICATE KEY UPDATE”

Hello peoples

$sql1="SELECT * FROM `table` WHERE `user` = '$user'";
$res1=mysql_query($sql1);
if(!$res1||mysql_num_rows($res1)<1){
$sql2="INSERT INTO `table` (`user`) VALUES ('$user')";
$res2=mysql_query($sql2);
if(!$res2){echo 'Yes';}else{echo 'No';}
}
else{echo 'user already exists!';}

Can to combine the two queries into one?

Answer 1

If you set your column user to UNIQUE, there’ll be a maximum of ONE entry of each user. To ALTER TABLE and make the column UNIQUE:

ALTER TABLE `table`
    ADD UNIQUE INDEX `user` (`user`);

And then, a single query like this would be good:

$res = mysql_query("INSERT IGNORE INTO `table`(`user`) VALUES( '".mysql_real_escape_string($user) . "')";
echo ( mysql_affected_rows() == 0 ) ? "No" : "Yes";

mysql_affected_rows().