iBatis2学习笔记：一对多映射（双向）

iBatis2学习笔记：一对多映射（双向）

 

环境：
MySQL5.51b
iBatis 2.3
Spring 2.5.4

 

本来是单向的，稍微改改就成为双向的了。呵呵。

 

一、模型

二、SQL

/*==============================================================*/
/* Table: customer                                              */
/*==============================================================*/
create table customer
(
   id                   bigint not null,
   address               varchar(120),
   postcode             varchar(6),
   sex                   varchar(2),
   name                 varchar(24),
   primary key (id)
);

alter table customer comment '客户';


/*==============================================================*/
/* Table: orders                                                */
/*==============================================================*/
create table orders
(
   id                   bigint not null,
   code                 varchar(24),
   customerId           bigint not null,
   primary key (id)
);

alter table orders comment '订单';

alter table orders add constraint FK_rf1 foreign key (customerId)
       references customer (id) on delete restrict on update restrict;

 

二、POJO

public class Customer {
     private Long id;
     private String name;
     private String address;
     private String postcode;
     private String sex;
     private List<Orders> orderlist = new ArrayList<Orders>();

 

    public String toString() {
        return "Customer{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", address='" + address + '\'' +
                ", postcode='" + postcode + '\'' +
                ", sex='" + sex + '\'' +
                ", orderlist=" + orderlist.size() +
                '}';
    }

 

public class Orders {
     private Long id;
     private String code;
     private Long customerId;
     private Customer customer;

 

    public String toString() {
        return "Orders{" +
                "id=" + id +
                ", code='" + code + '\'' +
                ", customerId=" + customerId +
                '}';
    }

 

三、SqlMap

 

Customer.xml

<? xml version ="1.0" encoding ="UTF-8" ?>
<!DOCTYPE sqlMap PUBLIC "-//ibatis.apache.org//DTD SQL Map 2.0//EN" "http://ibatis.apache.org/dtd/sql-map-2.dtd" >
< sqlMap namespace ="customer" >
     < typeAlias alias ="customer" type ="com.lavasoft.ssi.domain.Customer" />

     < resultMap id ="result_base" class ="customer" >
         < result property ="id" column ="id" />
         < result property ="name" column ="name" />
         < result property ="address" column ="address" />
         < result property ="postcode" column ="postcode" />
         < result property ="sex" column ="sex" />
     </ resultMap >
     < resultMap id ="result" class ="customer" extends ="result_base" >
         < result property ="orderlist" column ="id" select ="orders.findByCustomerId" />
     </ resultMap >

     < insert id ="insert" parameterClass ="customer" >
        insert into customer(address,postcode,sex,name) values(#address#,#postcode#,#sex#,#name#)
         < selectKey keyProperty ="id" resultClass ="long" >
            select LAST_INSERT_ID()
         </ selectKey >
     </ insert >
     < select id ="getById" parameterClass ="long" resultMap ="result_base" >
        select * from customer where id = #value#
     </ select >
     < select id ="getWithCashById" parameterClass ="long" resultMap ="result" >
        select * from customer where id = #value#
     </ select >
     < select id ="getWithCashByIdInnerjoin" parameterClass ="long" resultClass ="customer" resultMap ="result" >
        select c.* from customer c inner join orders o on c.id=o.customerId
     </ select >


</ sqlMap >

 

Orders.xml

<? xml version ="1.0" encoding ="UTF-8" ?>
<!DOCTYPE sqlMap PUBLIC "-//ibatis.apache.org//DTD SQL Map 2.0//EN" "http://ibatis.apache.org/dtd/sql-map-2.dtd" >
< sqlMap namespace ="orders" >
     < typeAlias alias ="orders" type ="com.lavasoft.ssi.domain.Orders" />
     < resultMap id ="result_base" class ="orders" >
         < result property ="id" column ="id" />
         < result property ="code" column ="code" />
         < result property ="customerId" column ="customerId" />
     </ resultMap >
     < resultMap id ="result" class ="orders" extends ="result_base" >
         < result property ="customer" column ="customerId" select ="customer.getById" />
     </ resultMap >

     < insert id ="insert" parameterClass ="orders" >
        insert into orders(id,code,customerId) values(#id#,#code#,#customerId#)
         < selectKey keyProperty ="id" resultClass ="long" >
            select LAST_INSERT_ID()
         </ selectKey >
     </ insert >

     < select id ="findByCustomerId" resultMap ="result_base" parameterClass ="long" >
        select * from orders where customerId = #value#
     </ select >
     < select id ="getById" parameterClass ="long" resultMap ="result_base" >
        select * from orders where id = #value#
     </ select >
     < select id ="getByIdWithCash" resultMap ="result" resultClass ="orders" parameterClass ="long" >
        select * from orders where id = #value#
     </ select >

</ sqlMap >

 

四、DAO

public interface CustomerDAO {
     public Long insert(Customer c);
     public List<Customer> getById(Long id);
     public List<Customer> getWithCashById(Long id);
     public List<Customer> getWithCashByIdInnerjoin();    
}

 

public interface OrdersDAO {
     public Long insert(Orders o);
     public Orders getById(Long id);
     public List<Orders> findByCustomerId(Long cid);
     public List<Orders> getByIdWithCash(Long id);
}

 

public class CustomerDAOImpl extends SqlMapClientDaoSupport implements CustomerDAO {

     public Long insert(Customer c) {
         return (Long) getSqlMapClientTemplate().insert( "customer.insert",c);
    }

     public List<Customer> getById(Long id) {
         return getSqlMapClientTemplate().queryForList( "customer.getById",id);
    }

     public List<Customer> getWithCashById(Long id) {
         return getSqlMapClientTemplate().queryForList( "customer.getWithCashById",id);
    }
     public List<Customer> getWithCashByIdInnerjoin(){
         return getSqlMapClientTemplate().queryForList( "customer.getWithCashByIdInnerjoin");
    }
}

 

public class OrdersDAOImpl extends SqlMapClientDaoSupport implements OrdersDAO {

     public Long insert(Orders o) {
         return (Long) getSqlMapClientTemplate().insert( "orders.insert", o);
    }

     public Orders getById(Long id) {
         return (Orders) getSqlMapClientTemplate().queryForObject( "orders.getById", id);
    }

     public List<Orders> findByCustomerId(Long cid) {
         return getSqlMapClientTemplate().queryForList( "orders.findByCustomerId", cid);
    }

     public List<Orders> getByIdWithCash(Long id) {
         return (List<Orders>) getSqlMapClientTemplate().queryForList( "orders.getByIdWithCash",id);
    }
}

 

五、测试

public class ApplicationContextUtils {
     private static ApplicationContext applicationContext;

     static {
         if (applicationContext == null)
            applicationContext = rebuildApplicationContext();
    }

     public static ApplicationContext rebuildApplicationContext() {
         return new ClassPathXmlApplicationContext( "ApplicationContext.xml");
    }

     public static ApplicationContext getApplicationContext() {
         return applicationContext;
    }

     /**
     * @param args
     */
     public static void main(String[] args) {
        rebuildApplicationContext();
         if (applicationContext == null) {
            System.out.println( "ApplicationContext is null");
        } else {
            System.out.println( "ApplicationContext is not null!");
        }
    }
}

 

/**
* Created by IntelliJ IDEA.<br>
* <b>User</b>: leizhimin<br>
* <b>Date</b>: 2008-6-15 22:50:15<br>
* <b>Note</b>: 客户订单一对多模型：客户
*/
public class CustomerDAOTest {
     private CustomerDAO customerDAO = (CustomerDAO) ApplicationContextUtils.getApplicationContext().getBean( "customerDAO");

     public void testInsert() {
        System.out.println( "--------insert(Customer c)--------");
        Customer c = new Customer();
         //fuck!竟然不支持级联保存！
//        Orders order1 = new Orders("o1");
//        Orders order2 = new Orders("o2");
//        c.getOrderlist().add(order1);
//        c.getOrderlist().add(order2);
        c.setName( "多对一");
        c.setSex( "M");
        c.setPostcode( "450003");
        c.setAddress( "郑州市花园路");
        Long pk = customerDAO.insert(c);
        System.out.println( "插入数据的ID=" + pk);
    }

     public void testGetById() {
        System.out.println( "--------getById(Long id)--------");
        Long pk = 1L;
        List<Customer> list = customerDAO.getById(pk);
         for (Customer c : list) {
            System.out.println(c);
        }
    }

     public void testGetWithCashById() {
        System.out.println( "--------getWithCashById(Long id)--------");
        Long pk = 1L;
        List<Customer> list = customerDAO.getWithCashById(pk);
         for (Customer c : list) {
            System.out.println(c);
        }
    }

     public void testGetWithCashByIdInnerjoin() {
        System.out.println( "--------getWithCashByIdInnerjoin()--------");
        List<Customer> list = customerDAO.getWithCashByIdInnerjoin();
         for (Customer c : list) {
            System.out.println(c);
        }
    }

     public static void main(String args[]) {
        System.out.println( "正在测试CustomerDAO");
        CustomerDAOTest customerDAOTest = new CustomerDAOTest();
        customerDAOTest.testInsert();
        customerDAOTest.testGetById();
        customerDAOTest.testGetWithCashById();
        customerDAOTest.testGetWithCashByIdInnerjoin();

    }
}

 

public class OrdersDAOTest {
    OrdersDAO ordersDAO = (OrdersDAO) ApplicationContextUtils.getApplicationContext().getBean( "ordersDAO");

     public void testInsert() {
        System.out.println( "--------getWithCashById(Long id)--------");
        Orders o = new Orders( "o1");
        o.setCustomerId(1L);
        Long pk = ordersDAO.insert(o);
        System.out.println( "所插入数据ID=" + pk);
    }

     public void testGetById() {
        System.out.println( "--------getById(Long id)--------");
        Orders o = ordersDAO.getById(1L);
        System.out.println( "查询结果：" + o.toString());
    }

     public void testFindByCustomerId() {
        System.out.println( "--------findByCustomerId(Long cid)--------");
        List<Orders> list = ordersDAO.findByCustomerId(1L);
         for(Orders o : list){
            System.out.println(o);
        }
    }
     public static void main(String args[]){
        System.out.println( "正在测试OrderDAO");
        OrdersDAOTest ordersDAOTest = new OrdersDAOTest();
        ordersDAOTest.testInsert();
        ordersDAOTest.testGetById();
        ordersDAOTest.testFindByCustomerId();
        ordersDAOTest.testGetByIdWithCash();
    }

     public void testGetByIdWithCash(){
        System.out.println( "------------getByIdWithCash(Long id)----------");
        List<Orders> list = ordersDAO.getByIdWithCash(1L);
         for(Orders o : list){
            System.out.println(o + "\n\t"+o.getCustomer().toString());
        }
    }

}

 

测试结果分别为：

正在测试CustomerDAO
log4j:WARN No appenders could be found for logger (org.springframework.context.support.ClassPathXmlApplicationContext).
log4j:WARN Please initialize the log4j system properly.
--------insert(Customer c)--------
插入数据的ID=1
--------getById(Long id)--------
Customer{id=1, name='多对一', address='郑州市花园路', postcode='450003', sex='M', orderlist=0}
--------getWithCashById(Long id)--------
Customer{id=1, name='多对一', address='郑州市花园路', postcode='450003', sex='M', orderlist=0}
--------getWithCashByIdInnerjoin()--------

Process finished with exit code 0

 

正在测试OrderDAO
log4j:WARN No appenders could be found for logger (org.springframework.context.support.ClassPathXmlApplicationContext).
log4j:WARN Please initialize the log4j system properly.
--------getWithCashById(Long id)--------
所插入数据ID=1
--------getById(Long id)--------
查询结果：Orders{id=1, code='o1', customerId=1}
--------findByCustomerId(Long cid)--------
Orders{id=1, code='o1', customerId=1}
------------getByIdWithCash(Long id)----------
Orders{id=1, code='o1', customerId=1}
    Customer{id=1, name='多对一', address='郑州市花园路', postcode='450003', sex='M', orderlist=0}

Process finished with exit code 0

 

本文出自 “熔 岩” 博客，转载请与作者联系！