[英]How do I change this script so when it finds a user exists in a MySQL database it updates and doesn't return the error message?
腳本的此部分檢查多個用戶名,我希望它更新找到的用戶,而不是以用戶存在的錯誤消息結尾:
// Verify a users existance by username. Function will fail if multiple usernames are encountered.
function userExists( $username )
{
// set up prepared statement
$stmt = $this->conn->prepare("SELECT * FROM $this->table WHERE $this->username_column = ?");
// bind the parameters
$stmt->bind_param("s", $username);
// execute prepared statement
if(!$stmt->execute())
{
$this->lastError = "Error in ".__FUNCTION__.": Username provided has more then one (".$stmt->num_rows().") records associated with it where there should only be one record.";
return false;
}
$stmt->store_result();
// check to make sure a username doesn't have duplicate usernames
if($stmt->num_rows() == 0)
{
$this->lastError = "Error in ".__FUNCTION__.": Username provided has more then one (".$stmt->num_rows().") records associated with it where there should only be one record.";
return false;
}
// return indicating success
return true;
}
我不確定是否需要這樣做來幫助回答,但是腳本的這一部分用於將新用戶添加到數據庫中:
function addUser( $username, $password )
{
// encrypt password if set (default == enabled w/ sha1)
if($this->use_encryption)
$password = ($_SESSION['password']);
$salt = "CHANGE-SALT";
// Add some salt to the users password.
$salt .= $password; // The password is salted
$password = $salt; // Change the password var to contain our new salted pass.
$password = md5($password);
if($this->userExists( $username ))
die("ERROR USER EXISTS");
// create sql
$sql = "INSERT INTO $this->table ( $this->username_column , $this->password_column) VALUES (?, ?)";
// set up prepared statement
$stmt = $this->conn->prepare($sql);
// bind the parameters
$stmt->bind_param("ss", $username, $password);
// execute prepared statement
if(!$stmt->execute())
{
$this->lastError = "Error in ".__FUNCTION__.": Supplied user/pass fields cannot be added.";
return false;
}
return true;
}
非常感謝您,為此提供的任何幫助。
特雷弗
REPLACE的工作方式與INSERT完全相同,不同之處在於,如果表中的舊行與PRIMARY KEY或UNIQUE索引的新行具有相同的值,則在插入新行之前會刪除該舊行。
在用戶名列中添加唯一索引;
REPLACE INTO user SET username=".$username." AND password=".$password;
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