maxdb_rpl_query_type
maxdb_send_long_data
MaxDB Funktionen
PHP Manual

# maxdb_select_db

# maxdb::select_db

(PECL maxdb >= 1.0)

maxdb_select_db -- maxdb::select_db — Selects the default database for database queries

### Beschreibung

bool maxdb_select_db ( resource `$link` , string `$dbname` )

The maxdb_select_db() function selects the default database (specified by the `dbname` parameter) to be used when performing queries against the database connection represented by the `link` parameter.

> 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 maxdb_connect().

### Rückgabewerte

Gibt bei Erfolg `TRUE` zurück. Im Fehlerfall wird `FALSE` zurückgegeben.

### Beispiele

Beispiel #1 Objektorientierter Stil

`<?php
$maxdb = new maxdb("localhost", "MONA", "RED", "DEMODB");
/* check connection */
if (maxdb_connect_errno()) {
printf("Connect failed: %s\n", maxdb_connect_error());
exit();
}
/* return name of current default database */
if ($result = $maxdb->query("SELECT SERVERDB FROM USERS WHERE USERNAME='MONA'")) {
$row = $result->fetch_row();
printf("Default database is %s.\n", $row[0]);
$result->close();
}
/* change db to non existing db */
$maxdb->select_db("XXXXXXXX");
/* return name of current default database */
if ($result = $maxdb->query("SELECT SERVERDB FROM USERS WHERE USERNAME='MONA'")) {
$row = $result->fetch_row();
printf("Default database is %s.\n", $row[0]);
$result->close();
}
$maxdb->close();
?>`

Beispiel #2 Prozeduraler Stil

`<?php
$link = maxdb_connect("localhost", "MONA", "RED", "DEMODB");
/* check connection */
if (maxdb_connect_errno()) {
printf("Connect failed: %s\n", maxdb_connect_error());
exit();
}
/* return name of current default database */
if ($result = maxdb_query($link, "SELECT SERVERDB FROM USERS WHERE USERNAME='MONA'")) {
$row = maxdb_fetch_row($result);
printf("Default database is %s.\n", $row[0]);
maxdb_free_result($result);
}
/* change db to non existing db */
maxdb_select_db($link, "XXXXXXXX");
/* return name of current default database */
if ($result = maxdb_query($link, "SELECT SERVERDB FROM USERS WHERE USERNAME='MONA'")) {
$row = maxdb_fetch_row($result);
printf("Default database is %s.\n", $row[0]);
maxdb_free_result($result);
}
maxdb_close($link);
?>`

Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:

    Default database is <...>.

    Warning: maxdb_select_db(): -10709 Connection failed (RTE:database not running) <...>

    Warning: maxdb_query(): -10821 Session not connected [] <...>

    Warning: maxdb_close(): -10821 Session not connected [] <...>

### Siehe auch

- maxdb_connect() - Open a new connection to the MaxDB server
- maxdb_real_connect() - Opens a connection to a MaxDB server

maxdb_rpl_query_type
maxdb_send_long_data
MaxDB Funktionen
PHP Manual