Note that the order of arguments for `mysqli_select_db` is opposite what it is for the deprecated `mysql_select_db`.
mysqli::select_db
mysqli_select_db
(PHP 5, PHP 7, PHP 8)
mysqli::select_db -- mysqli_select_db — Selects the default database for database queries
Descrizione
Stile orientato agli oggetti
Stile procedurale
Selects the default database to be used when performing queries against the database connection.
Nota:
This function should only be used to change the default database for the connection. You can select the default database with 4th parameter in mysqli_connect().
Elenco dei parametri
-
link -
Solo nello stile procedurale: un identificatore restituito da mysqli_connect() o mysqli_init()
-
database -
The database name.
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::select_db() example
Stile orientato agli oggetti
<?php
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$mysqli = new mysqli("localhost", "my_user", "my_password", "test");
/* get the name of the current default database */
$result = $mysqli->query("SELECT DATABASE()");
$row = $result->fetch_row();
printf("Default database is %s.\n", $row[0]);
/* change default database to "world" */
$mysqli->select_db("world");
/* get the name of the current default database */
$result = $mysqli->query("SELECT DATABASE()");
$row = $result->fetch_row();
printf("Default database is %s.\n", $row[0]);Stile procedurale
<?php
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$link = mysqli_connect("localhost", "my_user", "my_password", "test");
/* get the name of the current default database */
$result = mysqli_query($link, "SELECT DATABASE()");
$row = mysqli_fetch_row($result);
printf("Default database is %s.\n", $row[0]);
/* change default database to "world" */
mysqli_select_db($link, "world");
/* get the name of the current default database */
$result = mysqli_query($link, "SELECT DATABASE()");
$row = mysqli_fetch_row($result);
printf("Default database is %s.\n", $row[0]);I precedenti esempi visualizzeranno:
Default database is test. Default database is world.
Vedere anche:
- mysqli_connect() - Alias di mysqli::__construct
- mysqli_real_connect() - Opens a connection to a mysql server
add a note
User Contributed Notes 1 note
lori at astoundingteam dot com ¶
1 year ago
