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(PECL mysqlnd-uh >= 1.0.0-alpha)
MysqlndUhConnection::selectDb — Selects the default database for database queries
$connection 
   ,  string $database 
   )Selects the default database for database queries.
connection Mysqlnd connection handle. Do not modify!
database The database name.
   Returns  TRUE  on success.
   Otherwise, returns  FALSE  
Example #1 MysqlndUhConnection::selectDb() example
  <?php
 class  proxy  extends  MysqlndUhConnection  {
 public function  selectDb ( $res ,  $database ) {
   printf ( "%s(%s)\n" ,  __METHOD__ ,  var_export ( func_get_args (),  true ));
   $ret  =  parent :: selectDb ( $res ,  $database );
   printf ( "%s returns %s\n" ,  __METHOD__ ,  var_export ( $ret ,  true ));
  return  $ret ;
 }
}
 mysqlnd_uh_set_connection_proxy (new  proxy ());
 $mysqli  = new  mysqli ( "localhost" ,  "root" ,  "" ,  "test" );
 $mysqli -> select_db ( "mysql" );
 ?>   以上例程会输出:
proxy::selectDb(array ( 0 => NULL, 1 => 'mysql', )) proxy::selectDb returns true