对mysql使用一两个PHP脚本

Question

I have one script of php which should check if given user exists in Users table, and if not it creates it, if yes then it updates the existing user with new information.

Should I create all in one sql query to do the checks and insert/update or should I first use one php script to get row count and then use second script to insert/update new user?

I know SQL but only the basics, so it is not my strong side.

Also which solution is better towards client/server communication?

Answer 1

I really like to use this function:

function exists($detail, $table, $column, $value) {
        $query = mysqli_query($this->connect, "SELECT `$detail` FROM `$table` WHERE `$column` = '$value'");
        $count = mysqli_num_rows($query);

        if($count >= 1) {
            return true;
        } else {
            return false;
        }
    }

So if the user exists it will return true else false. After this check I would run another function / query to update a user.

the above function could look like this:

//SELECT `username` FROM `users` WHERE `username` = '$username'
if(exists('username', 'users', 'username', $username)) {
   //run this code if true
} else {
   //run this code if false
}