在连接数据库过程中用到下面几行语句,为了执行效率的提高,对使用后的对象要及时关下面关闭次序正确的是() Class.forName ("sun.jdbc.odbc.JdbcOdbcDriver"); Connection conn = DriverManager.getConnection("jdbc:odbc:Driver={MicroSoft Access Driver (*.mdb)};DBQ="+application.getRealPath("/myweb/sjk.mdb"),"",""); Statement stmt = conn.createStatement(); ResultSet rs = stmt.executeQuery("select * from chengji where xh='"+xh+"'");