mysqli::change_user

mysqli_change_user

(PHP 5, PHP 7, PHP 8)

mysqli::change_user -- mysqli_change_userChanges the user of the specified database connection

Descrizione

Stile orientato agli oggetti

public mysqli::change_user(string $username, string $password, ?string $database): bool

Stile procedurale

mysqli_change_user(
    mysqli $mysql,
    string $username,
    string $password,
    ?string $database
): bool

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()

username

The MySQL user name.

password

The MySQL password.

database

The database to change to.

If desired, the null value 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.

Errori/Eccezioni

If mysqli error reporting is enabled (MYSQLI_REPORT_ERROR) and the requested operation fails, a warning is generated. If, in addition, the mode is set to MYSQLI_REPORT_STRICT, a mysqli_sql_exception is thrown instead.

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

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.

Vedere anche:

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