(PHP 5, PHP 7, PHP 8)
mysqli::change_user -- mysqli_change_user — Changes the user of the database connection
Nesne yönelimli kullanım
$username, #[\SensitiveParameter] string $password, ?string $database): boolYordamsal kullanım
$mysql,$username,$password,$databaseAttempts to connect to the specified database using the provided credentials.
In comparison to mysqli::connect(), this method will not disconnect the current connection if the new connection cannot be opened.
In order to successfully change users a valid username and
password parameters must be provided and that user must have
sufficient permissions to access the desired database. If for any reason authorization
fails, the current user authentication will remain.
bağlantıSadece yordamsal tarz: mysqli_connect() veya mysqli_init() işlevinden dönen bir mysqli nesnesi.
usernameThe MySQL user name.
passwordThe MySQL password.
database
The database name. If null or an empty string is passed,
the connection to the server will be opened with no default database.
Eğer mysqli hata bildirimi etkinse (MYSQLI_REPORT_ERROR)
ve istenen işlem başarısız olursa bir uyarı üretilir. Ek olarak, kip
MYSQLI_REPORT_STRICT ise bunun yerine
mysqli_sql_exception istisnası oluşur.
Örnek 1 Resetting the connection session
Nesne yönelimli kullanım
<?php
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$mysqli = new mysqli("localhost", "my_user", "my_password", "test");
$mysqli->query("SET @a:=1");
$mysqli->change_user("my_user", "my_password", "world");
$result = $mysqli->query("SELECT DATABASE()");
$row = $result->fetch_row();
printf("Default database: %s\n", $row[0]);
$result = $mysqli->query("SELECT @a");
$row = $result->fetch_row();
if ($row[0] === null) {
printf("Value of variable a is NULL\n");
}Yordamsal kullanım
<?php
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$link = mysqli_connect("localhost", "my_user", "my_password", "test");
mysqli_query($link, "SET @a:=1");
mysqli_change_user($link, "my_user", "my_password", "world");
$result = mysqli_query($link, "SELECT DATABASE()");
$row = mysqli_fetch_row($result);
printf("Default database: %s\n", $row[0]);
$result = mysqli_query($link, "SELECT @a");
$row = mysqli_fetch_row($result);
if ($row[0] === null) {
printf("Value of variable a is NULL\n");
}Yukarıdaki örneklerin çıktısı:
Default database: world Value of variable a is NULL
Örnek 2 If database is null the connection is opened without selecting any default database
Nesne yönelimli kullanım
<?php
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$mysqli = new mysqli("localhost", "my_user", "my_password", "test");
$mysqli->change_user("my_user", "my_password", null);
$result = $mysqli->query("SELECT DATABASE()");
$row = $result->fetch_row();
printf("Default database: %s\n", $row[0]);Yukarıdaki örneklerin çıktısı:
Default database:
Bilginize:
Using this command will always cause the current database connection to behave as if was a completely new database connection, regardless of if the operation was completed successfully. This reset includes performing a rollback on any active transactions, closing all temporary tables, and unlocking all locked tables.