jdbcTemplaate queryForObject的两个易混淆的方法

JdbcTemplate中有两个可能会混淆的queryForObject方法： 

1.    Object queryForObject(String sql, Object[] args, Class requiredType)   

2.  Object queryForObject(String sql, Object[] args, RowMapper rowMapper)

第1个方法是只查一列的，参数“requiredType”不可以是自定义的类    如果要把查询结果封装为自定义的类，需要采用第2个方法    例如： 

//只查询一列：name
  String sql = "SELECT NAME FROM CUSTOMER WHERE CUST_ID = ?";
 
  String name = (String)getJdbcTemplate().queryForObject(
      sql, new Object[] { custId }, String.class);
 
  return name;
  
  //查询返回自定义的类
  String sql = "SELECT * FROM CUSTOMER WHERE CUST_ID = ?";
 
  Customer customer = (Customer)getJdbcTemplate().queryForObject(
      sql, new Object[] { custId }, 
      new BeanPropertyRowMapper(Customer.class));
 
  return customer;