Question

`

mysql_connect("host","admin","password");//database connection

mysql_select_db("dbname");


$order="INSERT INTO members (username, password) VALUES ('$_POST[username]','$_POST[password]')";



$doopquery = mysql_query("SELECT username FROM members WHERE username='$_POST[username]' ")

if ($doopquery) {
    echo("Username Taken");
} else {
    $result = mysql_query($order);
    echo("Account Registered");
}

＆GT;`

我到目前为止我的数据库连接很好，当我到达$ doop

时

Answer 1

$username=mysql_real_escape_string($_POST['username']);
$doopquery = mysql_query("SELECT username FROM members WHERE username='$username' ");
if(mysql_num_rows($doopquery)==0){
     //username not found
}
else{
      //username already exists
 }

缺少＆＃39;用户名

失踪;在$ doopquery结束时

Answer 2

这样做：

$username = mysql_real_escape_string($_POST['username']);
$password = mysql_real_escape_string($_POST['password']);

$query = "SELECT username FROM members WHERE username='{$username}'";
$result = mysql_query($query);
if(mysql_num_rows($result) > 0) {
  echo "Username Already Taken!";
}else{
  $query = "INSERT INTO members (username, password) VALUES ('{$username}','{$password}')";
  if(mysql_query($query)) {
    echo "Account Registered!";
  }else{
    echo "Account Register Failed!";
  }
}

试图让PHP检查数据插入中的重复项

2 个答案: