PHP Manual
MysqlndUhConnection
Selects the default database for database queries

MysqlndUhConnection::selectDb

(PECL mysqlnd-uh >= 1.0.0-alpha)

MysqlndUhConnection::selectDb — Selects the default database for database queries

说明

public MysqlndUhConnection::selectDb ( mysqlnd_connection $connection , string $database ) : bool

Selects the default database for database queries.

参数

connection: Mysqlnd connection handle. Do not modify!
database: The database name.

返回值

Returns TRUE on success. Otherwise, returns FALSE

范例

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

参见

mysqlnd_uh_set_connection_proxy() - Installs a proxy for mysqlnd connections
mysqli_select_db() - 选择用于数据库查询的默认数据库
mysql_select_db() - 选择 MySQL 数据库