PHP Dokumentation: Mysqli select-db
12. Januar 2010 von werner
mysqli::select_db
mysqli_select_db
(PHP 5)
mysqli::select_db — mysqli_select_db — Selects the default database for database queries
Beschreibung
Object oriented style (method):
bool mysqli::select_db ( string $dbname )
Procedural style:
Selects the default database to be used when performing queries against the database connection.
Hinweis: 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().
Parameter-Liste
- link
Nur bei prozeduralem Aufruf: Ein vonmysqli_connect() oder mysqli_init()zurückgegebenes Verbindungsobjekt.
- dbname
The database name.
Rückgabewerte
Gibt bei Erfolg TRUE zurück. Im Fehlerfall wird FALSE zurückgegeben.
Beispiele
Beispiel #1 Object oriented style
<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "test");/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}/* return name of current default database */
if ($result = $mysqli->query("SELECT DATABASE()")) {
$row = $result->fetch_row();
printf("Default database is %s.\n", $row[0]);
$result->close();
}/* change db to world db */
$mysqli->select_db("world");/* return name of current default database */
if ($result = $mysqli->query("SELECT DATABASE()")) {
$row = $result->fetch_row();
printf("Default database is %s.\n", $row[0]);
$result->close();
}$mysqli->close();
?>Beispiel #2 Procedural style
<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "test");/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}/* return name of current default database */
if ($result = mysqli_query($link, "SELECT DATABASE()")) {
$row = mysqli_fetch_row($result);
printf("Default database is %s.\n", $row[0]);
mysqli_free_result($result);
}/* change db to world db */
mysqli_select_db($link, "world");/* return name of current default database */
if ($result = mysqli_query($link, "SELECT DATABASE()")) {
$row = mysqli_fetch_row($result);
printf("Default database is %s.\n", $row[0]);
mysqli_free_result($result);
}mysqli_close($link);
?>Das oben gezeigte Beispiel erzeugt folgendeAusgabe:
Default database is test.Default database is world.
Siehe auch
- mysqli_connect() – Open a new connection to the MySQL server
- mysqli_real_connect() – Opens a connection to a mysql server
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