jdbcTemplate.queryForInt()过时替换方法

代替的方法为queryForObject(String sql, Object[] args, Class<T> requiredType)。
需要返回的是什么类型，就在第三个参数写什么类型。比如int类型就写Integer.class,                                                                                                 long类型就写Long.class.

String sqlStr = "select count(*) from t_user where user_name=? and password=?";
int count =  jdbcTemplate.queryForObject(sqlStr,new java.lang.Object[]{userName,password},Integer.class);

下面这种写法报错,必须传入完整包名:

String sqlStr = "select count(*) from t_user where user_name=? and password=?";

return  jdbcTemplate.queryForObject(sqlStr,new Object[]{userName,password},Integer.class);