mysqli::begin_transactionmysqli::change_user
mysqli_change_user
(PHP 5)
mysqli::change_user -- mysqli_change_user — Changes the user of the specified database connection
Descrierea
Stil obiect-orientat
$user
, string $password
, string $database
)Stil procedural
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.
Parametri
-
link -
Numai stilul procedural: Un identificator al legăturii întors de mysqli_connect() sau 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.
Valorile întoarse
Întoarce valoarea TRUE în cazul
succesului sau FALSE în cazul eșecului.
Note
Notă:
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.
Exemple
Example #1 mysqli::change_user() example
Stil obiect-orientat
<?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();
?>
Stil procedural
<?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);
?>
Exemplele de mai sus vor afișa:
Default database: world Value of variable a is NULL
Vedeți de asemenea
- mysqli_connect() - Pseudonim pentru mysqli::__construct
- mysqli_select_db() - Selects the default database for database queries
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