maxdb_select_db

maxdb::select_db

Selects the default database for database queries

&reftitle.description; `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.

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`.

&reftitle.returnvalues;

&return.success;

&reftitle.examples;

### &style.oop;

    <?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();
    ?>

### &style.procedural;

    <?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);
    ?>

&example.outputs.similar;

    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 [] <...>

&reftitle.seealso;

- `maxdb_connect`
- `maxdb_real_connect`