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Selects the default database for database queries


maxdb_select_db

maxdb::select_db

(PECL maxdb >= 1.0)

maxdb_select_db -- maxdb::select_dbSelects the default database for database queries

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.

Note:

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().

Return Values

Returns TRUE on success or FALSE on failure.

Examples

Example #1 Object oriented style

<?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();
?>

Example #2 Procedural style

<?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);
?>

The above example will output something similar to:

 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 [] <...> 

See Also



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