Spring MVC级联查询（用户与地址之间关系）

Spring MVC级联查询（用户与地址之间关系）

 这里的级联查询仿照Hibernate中的一对多关系映射，写个例子留个笔记
（地址表主表，用户表从表）
用户表（类）User
成员变量如下，并且对应有get和set方法

        private String uId;

private String uUserName;

private String uPassWord;

private String uTelephone;

private int uAge;

private Date uBirthday;
对应的表如下：

 

地址表（类）Address成员变量如下：

        private int no;

private String name;

private List<User> userList;


对应的UserDao中先写：

public List<User> findByAddressId(int a){

String sql="select * from usermbo where address=?";

List<User> users = new  ArrayList<User>();

Object[] params=new Object[]{a};

users = jdbcTemplate.query(sql,params, new UserRowMapper() );

return users;

}

private class UserRowMapper implements ParameterizedRowMapper<User>{

public User mapRow(ResultSet rs, int rowNum) throws SQLException {

User user = new User();

user.setuUserName(rs.getString("username"));

user.setuAge(rs.getInt("age"));

user.setuId(rs.getInt("id")+"");

user.setuTelephone(rs.getString("telephone"));

return user;

}

}

此部完成以后，再写AddressDao

@Autowired

private UserDao userDao ;

public List<Address> getAddress(){

String sql="select * from address";

List<Address> addresss = new  ArrayList<Address>();

addresss = jdbcTemplate.query(sql, new AddressRowMapper() );

return addresss;

}

private class AddressRowMapper implements ParameterizedRowMapper<Address>{

public Address mapRow(ResultSet rs, int rowNum) throws SQLException {

Address address=new Address( );

address.setNo(rs.getInt("no"));

address.setName(rs.getString("name"));

         address.setUserList( userDao.findByAddressId(rs.getInt("no")));

return address;

}

}
Service层再配一下（此层不配也行直接将
@Autowired
private AddressDao addressDao ;引入Controllar中即可）
在Controllar中再写

addressService.getAddress()就可以查出结果

 [Address [name=计算力, no=1, userList=[User [uAddress=null, uAge=12, uBirthday=null, uId=11, uPassWord=null, uTelephone=1234567, uUserName=张三]]], Address [name=大连, no=2, userList=[]], Address [name=海南, no=3, userList=[User [uAddress=null, uAge=34, uBirthday=null, uId=12, uPassWord=null, uTelephone=2323232323, uUserName=李四], User [uAddress=null, uAge=33, uBirthday=null, uId=13, uPassWord=null, uTelephone=2323, uUserName=王武]]]]