mysqli::begin_transactionmysqli::change_user
mysqli_change_user
(PHP 5)
mysqli::change_user -- mysqli_change_user — Changes the user of the specified database connection
Descrizione
Stile orientato agli oggetti
$user
, string $password
, string $database
)Stile procedurale
Changes the user of the specified database connection and sets the current database.
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.
Elenco dei parametri
-
link -
Solo nello stile procedurale: un identificatore restituito da mysqli_connect() o mysqli_init()
-
user -
The MySQL user name.
-
password -
The MySQL password.
-
database -
The database to change to.
If desired, the
NULLvalue may be passed resulting in only changing the user and not selecting a database. To select a database in this case use the mysqli_select_db() function.
Valori restituiti
Restituisce TRUE in caso di successo, FALSE in caso di fallimento.
Note
Nota:
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.
Esempi
Example #1 mysqli::change_user() example
Stile orientato agli oggetti
<?php
/* connect database test */
$mysqli = new mysqli("localhost", "my_user", "my_password", "test");
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
/* Set Variable a */
$mysqli->query("SET @a:=1");
/* reset all and select a new database */
$mysqli->change_user("my_user", "my_password", "world");
if ($result = $mysqli->query("SELECT DATABASE()")) {
$row = $result->fetch_row();
printf("Default database: %s\n", $row[0]);
$result->close();
}
if ($result = $mysqli->query("SELECT @a")) {
$row = $result->fetch_row();
if ($row[0] === NULL) {
printf("Value of variable a is NULL\n");
}
$result->close();
}
/* close connection */
$mysqli->close();
?>
Stile procedurale
<?php
/* connect database test */
$link = mysqli_connect("localhost", "my_user", "my_password", "test");
/* check connection */
if (!$link) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
/* Set Variable a */
mysqli_query($link, "SET @a:=1");
/* reset all and select a new database */
mysqli_change_user($link, "my_user", "my_password", "world");
if ($result = mysqli_query($link, "SELECT DATABASE()")) {
$row = mysqli_fetch_row($result);
printf("Default database: %s\n", $row[0]);
mysqli_free_result($result);
}
if ($result = mysqli_query($link, "SELECT @a")) {
$row = mysqli_fetch_row($result);
if ($row[0] === NULL) {
printf("Value of variable a is NULL\n");
}
mysqli_free_result($result);
}
/* close connection */
mysqli_close($link);
?>
I precedenti esempi visualizzeranno:
Default database: world Value of variable a is NULL
Vedere anche:
- mysqli_connect() - Alias di mysqli::__construct
- mysqli_select_db() - Selects the default database for database queries
add a note
User Contributed Notes
mysqli::change_user - [0 notes]