1、一对多关联关系
首先先用逆向生成工具生成t_hibernate_order、t_hibernate_order_item
这两张表对应的model与mapper
实体类
package com.xieminglu.ssm.model.vo;
import com.xieminglu.ssm.model.Order;
import com.xieminglu.ssm.model.OrderItem;
import java.util.ArrayList;
import java.util.List;
/**
* @author 迷鹿小女子
* @site www.baidu.com
* @company xxx公司
* @create 2019-10-23 11:45
*/
public class OrderVo extends Order {
private List<OrderItem> orderItems=new ArrayList<>();
public List<OrderItem> getOrderItems() {
return orderItems;
}
public void setOrderItems(List<OrderItem> orderItems) {
this.orderItems = orderItems;
}
}
package com.xieminglu.ssm.model.vo;
import com.xieminglu.ssm.model.Order;
import com.xieminglu.ssm.model.OrderItem;
/**
* @author 迷鹿小女子
* @site www.baidu.com
* @company xxx公司
* @create 2019-10-23 18:29
*/
public class OrderItemVo extends OrderItem {
private Order order;
public Order getOrder() {
return order;
}
public void setOrder(Order order) {
this.order = order;
}
@Override
public String toString() {
return "OrderItemVo{" +
"order=" + order +
'}';
}
}
OrderMapper.xml
<resultMap id="OrderVoMap" type="com.xieminglu.ssm.model.vo.OrderVo">
<result property="orderId" column="order_id"></result>
<result property="orderNo" column="order_no"></result>
<!--<result property="orderItems"></result>-->
<collection property="orderItems" ofType="com.xieminglu.ssm.model.OrderItem">
<result property="orderItemId" column="order_item_id"></result>
<result property="productId" column="product_id"></result>
<result property="quantity" column="quantity"></result>
<result property="oid" column="oid"></result>
</collection>
</resultMap>
<select id="selectByOrderId" resultMap="OrderVoMap" parameterType="java.lang.Integer" >
select * from t_hibernate_order o,t_hibernate_order_item oi where o.order_id=oi.oid
and oi.oid=#{orderId}
</select>
OrderMapper.java
package com.xieminglu.ssm.mapper;
import com.xieminglu.ssm.model.Order;
import com.xieminglu.ssm.model.vo.OrderVo;
import org.apache.ibatis.annotations.Param;
import org.springframework.stereotype.Repository;
import java.util.List;
@Repository
public interface OrderMapper {
int deleteByPrimaryKey(Integer orderId);
int insert(Order record);
int insertSelective(Order record);
Order selectByPrimaryKey(Integer orderId);
int updateByPrimaryKeySelective(Order record);
int updateByPrimaryKey(Order record);
List<OrderVo> selectByOrderId(@Param("orderId") Integer orderId);
}
OrderItemMapper.xml
<resultMap id="OrderItemVoMap" type="com.xieminglu.ssm.model.vo.OrderItemVo">
<result property="orderItemId" column="order_item_id"></result>
<result property="productId" column="product_id"></result>
<result property="quantity" column="quantity"></result>
<result property="oid" column="oid"></result>
<!--<result property="orderItems"></result>-->
<association property="order" javaType="com.xieminglu.ssm.model.Order">
<result property="orderId" column="order_id"></result>
<result property="orderNo" column="order_no"></result>
</association>
</resultMap>
<select id="selectByOrderItemId" resultMap="OrderItemVoMap" parameterType="java.lang.Integer" >
select * from t_hibernate_order o,t_hibernate_order_item oi where o.order_id=oi.oid
and oi.order_item_id=#{orderItemId}
</select>
OrderItemMapper.java
package com.xieminglu.ssm.mapper;
import com.xieminglu.ssm.model.OrderItem;
import com.xieminglu.ssm.model.vo.OrderItemVo;
import org.apache.ibatis.annotations.Param;
import org.springframework.stereotype.Repository;
import java.util.List;
@Repository
public interface OrderItemMapper {
int deleteByPrimaryKey(Integer orderItemId);
int insert(OrderItem record);
int insertSelective(OrderItem record);
OrderItem selectByPrimaryKey(Integer orderItemId);
int updateByPrimaryKeySelective(OrderItem record);
int updateByPrimaryKey(OrderItem record);
List<OrderItemVo> selectByOrderItemId(@Param("orderItemId") Integer orderItemId);
}
OneToManyService.java
package com.xieminglu.ssm.service;
import com.xieminglu.ssm.model.vo.OrderItemVo;
import com.xieminglu.ssm.model.vo.OrderVo;
import org.apache.ibatis.annotations.Param;
import java.util.List;
/**
* @author 迷鹿小女子
* @site www.baidu.com
* @company xxx公司
* @create 2019-10-23 18:49
*/
public interface OneToManyService {
List<OrderVo> selectByOrderId(Integer orderId);
List<OrderItemVo> selectByOrderItemId(Integer orderItemId);
}
package com.xieminglu.ssm.service.impl;
import com.xieminglu.ssm.mapper.CategoryMapper;
import com.xieminglu.ssm.mapper.HbookMapper;
import com.xieminglu.ssm.model.vo.CategoryVo;
import com.xieminglu.ssm.model.vo.HbookVo;
import com.xieminglu.ssm.service.ManyToMany;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
/**
* @author 迷鹿小女子
* @site www.baidu.com
* @company xxx公司
* @create 2019-10-23 20:17
*/
@Service
public class ManyToManyImpl implements ManyToMany {
@Autowired
private HbookMapper hbookMapper;
@Autowired
private CategoryMapper categoryMapper;
@Override
public HbookVo selectByBid(Integer bid) {
return hbookMapper.selectByBid(bid);
}
@Override
public CategoryVo selectByCid(Integer cid) {
return categoryMapper.selectByCid(cid);
}
}
OneToManyServiceImplTest.java
package com.xieminglu.ssm.service.impl;
import com.xieminglu.ssm.SpringJunitBaseTest;
import com.xieminglu.ssm.model.OrderItem;
import com.xieminglu.ssm.model.vo.OrderItemVo;
import com.xieminglu.ssm.model.vo.OrderVo;
import org.junit.Test;
import org.springframework.beans.factory.annotation.Autowired;
import java.util.List;
import static org.junit.Assert.*;
/**
* @author 迷鹿小女子
* @site www.baidu.com
* @company xxx公司
* @create 2019-10-23 19:36
*/
public class OneToManyServiceImplTest extends SpringJunitBaseTest {
@Autowired
private OneToManyServiceImpl oneToManyService;
@Test
public void selectByOrderId() {
List<OrderVo> orderVos = oneToManyService.selectByOrderId(8);
OrderVo orderVo=orderVos.get(0);
System.out.println(orderVo);
for (OrderItem orderItem : orderVo.getOrderItems()) {
System.out.println(orderItem);
}
}
@Test
public void selectByOrderItemId() {
List<OrderItemVo> orderItemVos = oneToManyService.selectByOrderItemId(36);
OrderItemVo orderItemVo = orderItemVos.get(0);
System.out.println(orderItemVo);
System.out.println(orderItemVo.getOrder());
}
}
2、多对多关联关系
首先先用逆向生成工具生成t_hibernate_book、t_hibernate_book_category、t_hibernate_category,这两张表对应的model与mapper
实体类
package com.xieminglu.ssm.model.vo;
import com.xieminglu.ssm.model.Category;
import com.xieminglu.ssm.model.Hbook;
import java.util.ArrayList;
import java.util.List;
/**
* @author 迷鹿小女子
* @site www.baidu.com
* @company xxx公司
* @create 2019-10-23 19:52
*/
public class HbookVo extends Hbook {
private List<Category> categories=new ArrayList<>();
public List<Category> getCategories() {
return categories;
}
public void setCategories(List<Category> categories) {
this.categories = categories;
}
}
package com.xieminglu.ssm.model.vo;
import com.xieminglu.ssm.model.Category;
import com.xieminglu.ssm.model.Hbook;
import java.util.ArrayList;
import java.util.List;
/**
* @author 迷鹿小女子
* @site www.baidu.com
* @company xxx公司
* @create 2019-10-23 19:53
*/
public class CategoryVo extends Category {
private List<Hbook> hbooks=new ArrayList<>();
public List<Hbook> getHbooks() {
return hbooks;
}
public void setHbooks(List<Hbook> hbooks) {
this.hbooks = hbooks;
}
}
HbookCategoryMapper.xml
<resultMap id="HbookVoMap" type="com.xieminglu.ssm.model.vo.HbookVo">
<result property="bookId" column="book_id"></result>
<result property="bookName" column="book_name"></result>
<result property="price" column="price"></result>
<!--<result property="orderItems"></result>-->
<collection property="categories" ofType="com.xieminglu.ssm.model.Category">
<result property="categoryId" column="category_id"></result>
<result property="categoryName" column="category_name"></result>
</collection>
</resultMap>
<resultMap id="CategoryVoMap" type="com.xieminglu.ssm.model.vo.CategoryVo">
<result property="categoryId" column="category_id"></result>
<result property="categoryName" column="category_name"></result>
<!--<result property="orderItems"></result>-->
<collection property="hbooks" ofType="com.xieminglu.ssm.model.Hbook">
<result property="bookId" column="book_id"></result>
<result property="bookName" column="book_name"></result>
<result property="price" column="price"></result>
</collection>
</resultMap>
<select id="selectByBid" resultMap="HbookVoMap" parameterType="java.lang.Integer" >
select * from t_hibernate_book b,t_hibernate_book_category bc,
t_hibernate_category c where b.book_id=bc.bid and bc.cid=c.category_id
and b.book_id=#{bid}
</select>
<select id="selectByCid" resultMap="CategoryVoMap" parameterType="java.lang.Integer" >
select * from t_hibernate_book b,t_hibernate_book_category bc,
t_hibernate_category c where b.book_id=bc.bid and bc.cid=c.category_id
and c.category_id=#{cid}
</select>
HbookMapper.java
package com.xieminglu.ssm.mapper;
import com.xieminglu.ssm.model.Hbook;
import com.xieminglu.ssm.model.vo.HbookVo;
import org.apache.ibatis.annotations.Param;
public interface HbookMapper {
int deleteByPrimaryKey(Integer bookId);
int insert(Hbook record);
int insertSelective(Hbook record);
Hbook selectByPrimaryKey(Integer bookId);
int updateByPrimaryKeySelective(Hbook record);
int updateByPrimaryKey(Hbook record);
HbookVo selectByBid(@Param("bid")Integer bid);
}
CategoryMapper.java
package com.xieminglu.ssm.mapper;
import com.xieminglu.ssm.model.Category;
import com.xieminglu.ssm.model.vo.CategoryVo;
import org.apache.ibatis.annotations.Param;
import org.springframework.stereotype.Repository;
@Repository
public interface CategoryMapper {
int deleteByPrimaryKey(Integer categoryId);
int insert(Category record);
int insertSelective(Category record);
Category selectByPrimaryKey(Integer categoryId);
int updateByPrimaryKeySelective(Category record);
int updateByPrimaryKey(Category record);
CategoryVo selectByCid(@Param("cid") Integer cid);
}
ManyToMany.java
package com.xieminglu.ssm.service;
import com.xieminglu.ssm.model.vo.CategoryVo;
import com.xieminglu.ssm.model.vo.HbookVo;
import org.apache.ibatis.annotations.Param;
/**
* @author 迷鹿小女子
* @site www.baidu.com
* @company xxx公司
* @create 2019-10-23 20:15
*/
public interface ManyToMany {
HbookVo selectByBid(@Param("bid")Integer bid);
CategoryVo selectByCid(@Param("cid") Integer cid);
}
package com.xieminglu.ssm.service.impl;
import com.xieminglu.ssm.mapper.CategoryMapper;
import com.xieminglu.ssm.mapper.HbookMapper;
import com.xieminglu.ssm.model.vo.CategoryVo;
import com.xieminglu.ssm.model.vo.HbookVo;
import com.xieminglu.ssm.service.ManyToMany;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
/**
* @author 迷鹿小女子
* @site www.baidu.com
* @company xxx公司
* @create 2019-10-23 20:17
*/
@Service
public class ManyToManyImpl implements ManyToMany {
@Autowired
private HbookMapper hbookMapper;
@Autowired
private CategoryMapper categoryMapper;
@Override
public HbookVo selectByBid(Integer bid) {
return hbookMapper.selectByBid(bid);
}
@Override
public CategoryVo selectByCid(Integer cid) {
return categoryMapper.selectByCid(cid);
}
}
ManyToManyImplTest.java
package com.xieminglu.ssm.service.impl;
import com.xieminglu.ssm.SpringJunitBaseTest;
import com.xieminglu.ssm.model.Category;
import com.xieminglu.ssm.model.Hbook;
import com.xieminglu.ssm.model.vo.CategoryVo;
import com.xieminglu.ssm.model.vo.HbookVo;
import com.xieminglu.ssm.service.ManyToMany;
import org.junit.Test;
import org.springframework.beans.factory.annotation.Autowired;
import static org.junit.Assert.*;
/**
* @author 迷鹿小女子
* @site www.baidu.com
* @company xxx公司
* @create 2019-10-23 20:18
*/
public class ManyToManyImplTest extends SpringJunitBaseTest {
@Autowired
private ManyToMany manyToMany;
@Test
public void selectByBid() {
HbookVo hbookVo = manyToMany.selectByBid(8);
System.out.println(hbookVo);
for (Category category : hbookVo.getCategories()) {
System.out.println(category);
}
}
@Test
public void selectByCid() {
CategoryVo categoryVo = this.manyToMany.selectByCid(8);
System.out.println(categoryVo);
for (Hbook hbook : categoryVo.getHbooks()) {
System.out.println(hbook);
}
}
}