mybatis关联关系映射

课程目标

1、一对多关联关系
2、多对多关联关系

一对多
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

HbookVo

package com.hw.ssm.model.vo;import com.hw.ssm.model.Category;
import com.hw.ssm.model.Hbook;import java.util.ArrayList;
import java.util.List;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;}}

CategoryVo

package com.hw.ssm.model.vo;import com.hw.ssm.model.Category;
import com.hw.ssm.model.Hbook;import java.util.ArrayList;
import java.util.List;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;}
}

OrderVo

package com.hw.ssm.model.vo;import com.hw.ssm.model.Order;
import com.hw.ssm.model.OrderItem;import java.util.ArrayList;
import java.util.List;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;}
}

OrderItemVo

package com.hw.ssm.model.vo;import com.hw.ssm.model.Order;
import com.hw.ssm.model.OrderItem;public class OrderItemVo extends OrderItem {private Order order;public Order getOrder() {return order;}public void setOrder(Order order) {this.order = order;}
}

OrderMapper.xml

<resultMap id="OrderVoMap" type="com.hw.ssm.model.vo.OrderVo" ><result property="orderId" column="order_id"></result><result property="orderNo" column="order_no"></result><collection property="orderItems" ofType="com.hw.ssm.model.OrderItem"><result property="orderItemId" column="order_item_id"></result><result property="oid" column="oid"></result><result property="productId" column="product_id"></result><result property="quantity" column="quantity"></result></collection>
</resultMap><select id="queryOrderVoByOrderId" resultMap="OrderVoMap" parameterType="java.lang.Integer">select * from t_hibernate_order o,t_hibernate_order_item oiwhere o.order_id = oi.oidand o.order_id = #{orderId}
</select>

OrderMapper.java

package com.hw.ssm.mapper;import com.hw.ssm.model.Order;
import com.hw.ssm.model.vo.OrderVo;
import org.apache.ibatis.annotations.Param;
import org.springframework.stereotype.Repository;import java.util.List;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.hw.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.hw.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 oiwhere o.order_id=oi.oidand oi.order_item_id = #{orderItemId}</select>

OrderItemMapper.java

package com.hw.mapper;import com.hw.model.OrderItem;
import com.hw.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

package com.hw.ssm.service;import com.hw.ssm.model.vo.OrderItemVo;
import com.hw.ssm.model.vo.OrderVo;import java.util.List;public interface OneToManyService {List<OrderVo> selectByOrderId(Integer orderId);List<OrderItemVo> selectByOrderItemId(Integer orderItemId);
}

OneToManyServiceImpl

package com.hw.ssm.service.impl;import com.hw.ssm.mapper.OrderItemMapper;
import com.hw.ssm.mapper.OrderMapper;
import com.hw.ssm.model.vo.OrderItemVo;
import com.hw.ssm.model.vo.OrderVo;
import com.hw.ssm.service.OneToManyService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;@Service
public class OneToManyServiceImpl implements OneToManyService {@Autowiredprivate OrderMapper orderMapper;@Autowiredprivate OrderItemMapper orderItemMapper;@Overridepublic List<OrderVo> selectByOrderId(Integer orderId) {return orderMapper.selectByOrderId(orderId);}@Overridepublic List<OrderItemVo> selectByOrderItemId(Integer orderItemId) {return orderItemMapper.selectByOrderItemId(orderItemId);}
}

OneToManyServiceImplTest

package com.hw.ssm.service.impl;import com.hw.ssm.model.OrderItem;
import com.hw.ssm.model.vo.OrderItemVo;
import com.hw.ssm.model.vo.OrderVo;
import com.hw.ssm.service.OneToManyService;
import com.hw.ssm.test.SpringJunitBaseTest;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.springframework.beans.factory.annotation.Autowired;import java.util.List;public class OneToManyServiceImplTest extends SpringJunitBaseTest {@Autowiredprivate OneToManyService oneToManyService;@Testpublic 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);}}@Testpublic void selectByOrderItemId() {List<OrderItemVo> orderItemVos = oneToManyService.selectByOrderItemId(36);OrderItemVo orderItemVo = orderItemVos.get(0);System.out.println(orderItemVo);System.out.println(orderItemVo.getOrder());}}

多对多

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

HbookVo

package com.hw.ssm.model.vo;import com.hw.ssm.model.Category;
import com.hw.ssm.model.Hbook;import java.util.ArrayList;
import java.util.List;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;}
}

CategoryVo

package com.hw.ssm.model.vo;import com.hw.ssm.model.Category;
import com.hw.ssm.model.Hbook;import java.util.ArrayList;
import java.util.List;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;}
}

 <resultMap id="HbookVoMap" type="com.hw.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.hw.ssm.model.Category"><result property="categoryId" column="category_id"></result><result property="categoryName" column="category_name"></result></collection></resultMap><resultMap id="CategoryVoMap" type="com.hw.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.hw.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.jav

package com.hw.ssm.mapper;import com.hw.ssm.model.Hbook;
import com.hw.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.hw.ssm.mapper;import com.hw.ssm.model.Category;
import com.hw.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);
}

ManyToManyService

package com.hw.ssm.service;import com.hw.ssm.model.vo.CategoryVo;
import com.hw.ssm.model.vo.HbookVo;public interface ManyToManyService {CategoryVo selectByCid(Integer cid);HbookVo selectByBid(Integer bid);
}

ManyToManyServiceImpl

package com.hw.ssm.service.impl;import com.hw.ssm.mapper.CategoryMapper;
import com.hw.ssm.mapper.HBookMapper;
import com.hw.ssm.model.vo.CategoryVo;
import com.hw.ssm.model.vo.HbookVo;
import com.hw.ssm.service.ManyToManyService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;@Service
public class ManyToManyServiceImpl implements ManyToManyService {@Autowiredprivate HBookMapper hBookMapper;@Autowiredprivate CategoryMapper categoryMapper;@Overridepublic CategoryVo selectByCid(Integer cid) {return categoryMapper.selectByCid(cid);}@Overridepublic HbookVo selectByBid(Integer bid) {return hBookMapper.selectByBid(bid);}
}

ManyToManyServiceImplTest

package com.hw.ssm.service.impl;import com.hw.SpringBaseTest;
import com.hw.ssm.model.Category;
import com.hw.ssm.model.HBook;
import com.hw.ssm.model.vo.CategoryVo;
import com.hw.ssm.model.vo.HbookVo;
import com.hw.ssm.service.ManyToManyService;
import org.junit.Test;
import org.springframework.beans.factory.annotation.Autowired;public class ManyToManyServiceImplTest extends SpringBaseTest {
@Autowired
private ManyToManyService manyToManyService;@Testpublic void selectByBid() {HbookVo hbookVo = manyToManyService.selectByBid(8);System.out.println(hbookVo);for (Category category : hbookVo.getCategories()) {System.out.println(category);}}@Testpublic void selectByCid() {CategoryVo categoryVo = this.manyToManyService.selectByCid(8);System.out.println(categoryVo);for (HBook gethBook : categoryVo.gethBooks()) {System.out.println(gethBook);}}}

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mybatis关联关系映射

课程目标

HbookVo

CategoryVo

OrderVo

OrderItemVo

OrderMapper.xml

OrderMapper.java

OrderItemMapper.xml

OrderItemMapper.java

OneToManyService

OneToManyServiceImpl

OneToManyServiceImplTest

多对多

HbookVo

CategoryVo

HbookMapper.jav

CategoryMapper.java

ManyToManyService

ManyToManyServiceImpl

ManyToManyServiceImplTest

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