mysql-jdbc往Mysql中添加数据没反应，求教

@Testpublic void ZengTest() { Connection conn = null; Statement sta = null; try{ Class.forName("com.mysql.jdbc.Driver"); conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/d-7test", "root", "cailikun"); sta = conn.createStatement(); //增加数据的sql： String sql = "insert into `uesr`(name) values('小蔡') "; sta.executeUpdate(sql); } catch(Exception e){ e.printStackTrace(); }finally{ //最后执行两次“事” try{if(sta!=null){ sta.close(); } }catch(Exception e){ e.printStackTrace(); }finally{ try{if(conn!=null){ conn.close(); } }catch(Exception e){ e.printStackTrace(); } } }}