Mybatis关联关系映射

一、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

Model：

Order：


package com.zwc.ssm.model;
 
import lombok.Data;
 
//@Data相当于添加了set、get方法，同时添加了tostring方法
//@AllArgsConstructor
//@NoArgsConstructor
@Data
public class Order {
    private Integer orderId;
 
    private String orderNo;
 
 
}

OrderItem：


package com.zwc.ssm.model;
 
import lombok.ToString;
 
@ToString
public class OrderItem {
    private Integer orderItemId;
 
    private Integer productId;
 
    private Integer quantity;
 
    private Integer oid;
 
    public OrderItem(Integer orderItemId, Integer productId, Integer quantity, Integer oid) {
        this.orderItemId = orderItemId;
        this.productId = productId;
        this.quantity = quantity;
        this.oid = oid;
    }
 
    public OrderItem() {
        super();
    }
 
    public Integer getOrderItemId() {
        return orderItemId;
    }
 
    public void setOrderItemId(Integer orderItemId) {
        this.orderItemId = orderItemId;
    }
 
    public Integer getProductId() {
        return productId;
    }
 
    public void setProductId(Integer productId) {
        this.productId = productId;
    }
 
    public Integer getQuantity() {
        return quantity;
    }
 
    public void setQuantity(Integer quantity) {
        this.quantity = quantity;
    }
 
    public Integer getOid() {
        return oid;
    }
 
    public void setOid(Integer oid) {
        this.oid = oid;
    }
}

OderVo:


package com.zwc.ssm.model.vo;
 
import com.zwc.ssm.model.Order;
import com.zwc.ssm.model.OrderItem;
 
import java.util.List;
 
/**
 * @authorzwc
 * @site www.javazwc.com
 * @company xxx公司
 * @create  2022-08-15 19:03
 * vo类不仅仅包含当前表信息，还能够包含相关联表的信息
 *
 * 当前订单会有一个或多个订单项，多个订单项必须要集合进行接受
 */
public class OrderVo extends Order {
//    通过订单号查询订单的详细信息及对应的所有订单项信息
 
      private List orderItems;
 
    public List getOrderItems() {
        return orderItems;
    }
 
    public void setOrderItems(List orderItems) {
        this.orderItems = orderItems;
    }
}

OrderItemVo:


package com.zwc.ssm.model.vo;
 
import com.zwc.ssm.model.Order;
import com.zwc.ssm.model.OrderItem;
 
/**
 * @authorzwc
 * @site www.javazwc.com
 * @company xxx公司
 * @create  2022-08-15 19:08
 *
 * 某一个订单项一定属于某个订单的
 */
public class OrderItemVo extends OrderItem {
    private Order order;
 
    public Order getOrder() {
        return order;
    }
 
    public void setOrder(Order order) {
        this.order = order;
    }
}

OrderMapper.xml:

OrderItemMapper.xml:

需求一：通过订单号查询本次订单的详细信息及对应的所有订单详细

OrderBiz:


package com.zwc.ssm.biz;
 
import com.zwc.ssm.model.Order;
import com.zwc.ssm.model.vo.OrderVo;
 
public interface OrderBiz {
    int deleteByPrimaryKey(Integer orderId);
 
    int insert(Order record);
 
    int insertSelective(Order record);
 
    Order selectByPrimaryKey(Integer orderId);
 
    OrderVo queryOrderVoByOrderId(Integer orderId);
 
    int updateByPrimaryKeySelective(Order record);
 
    int updateByPrimaryKey(Order record);
}

OrderBizimpl:


 
 * @authorzwc
 * @site www.javazwc.com
 * @company xxx公司
 * @create  2022-08-15 19:32
 */
@Service
public class OrderBizImpl implements OrderBiz {
    @Autowired
 
    private OrderMapper orderMapper;
 
    @Override
    public int deleteByPrimaryKey(Integer orderId) {
        return 0;
    }
 
    @Override
    public int insert(Order record) {
        return 0;
    }
 
    @Override
    public int insertSelective(Order record) {
        return 0;
    }
 
    @Override
    public Order selectByPrimaryKey(Integer orderId) {
        return null;
    }
 
    @Override
    public OrderVo queryOrderVoByOrderId(Integer orderId) {
        return orderMapper.queryOrderVoByOrderId(orderId);
    }
 
    @Override
    public int updateByPrimaryKeySelective(Order record) {
        return 0;
    }
 
    @Override
    public int updateByPrimaryKey(Order record) {
        return 0;
    }
}

OrderBizimplTest:


package com.zwc.ssm.biz.impl;
 
import com.zwc.ssm.biz.OrderBiz;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
 
/**
 * @authorzwc
 * @site www.javazwc.com
 * @company xxx公司
 * @create  2022-08-15 19:33
 */
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations={"classpath:applicationContext-mybatis.xml"})
public class OrderBizImplTest {
 
    @Autowired
    private OrderBiz orderBiz;
 
    @Test
    public void queryOrderVoByOrderId() {
        System.out.println(orderBiz.queryOrderVoByOrderId(9));
    }
}

运行结果：

需求2:通过订单项ID查询出订单项详细信息及所属订单

OrderitemBIz:


package com.zwc.ssm.biz;
 
import com.zwc.ssm.model.OrderItem;
import com.zwc.ssm.model.vo.OrderItemVo;
import org.apache.ibatis.annotations.Param;
 
public interface OrderItemBiz {
    int deleteByPrimaryKey(Integer orderItemId);
 
    int insert(OrderItem record);
 
    int insertSelective(OrderItem record);
 
    OrderItem selectByPrimaryKey(Integer orderItemId);
 
    OrderItemVo queryOrderItemVoByOrderItemId(Integer orderItemId);
 
    int updateByPrimaryKeySelective(OrderItem record);
 
    int updateByPrimaryKey(OrderItem record);
}

OrderItemBizimpl:


package com.zwc.ssm.biz.impl;
 
import com.zwc.ssm.biz.OrderItemBiz;
import com.zwc.ssm.mapper.OrderItemMapper;
import com.zwc.ssm.model.OrderItem;
import com.zwc.ssm.model.vo.OrderItemVo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
 
/**
 * @authorzwc
 * @site www.javazwc.com
 * @company xxx公司
 * @create  2022-08-15 20:34
 */
@Service
public class OrderItemBizImpl implements OrderItemBiz {
    @Autowired
 
    private OrderItemMapper orderItemMapper;
 
    @Override
    public int deleteByPrimaryKey(Integer orderItemId) {
        return 0;
    }
 
    @Override
    public int insert(OrderItem record) {
        return 0;
    }
 
    @Override
    public int insertSelective(OrderItem record) {
        return 0;
    }
 
    @Override
    public OrderItem selectByPrimaryKey(Integer orderItemId) {
        return null;
    }
 
    @Override
    public OrderItemVo queryOrderItemVoByOrderItemId(Integer orderItemId) {
        return orderItemMapper.queryOrderItemVoByOrderItemId(orderItemId);
    }
 
    @Override
    public int updateByPrimaryKeySelective(OrderItem record) {
        return 0;
    }
 
    @Override
    public int updateByPrimaryKey(OrderItem record) {
        return 0;
    }
}

OrderItemBizimplTest:


package com.zwc.ssm.biz.impl;
 
import com.zwc.ssm.biz.OrderItemBiz;
import com.zwc.ssm.model.vo.OrderItemVo;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
 
/**
 * @authorzwc
 * @site www.javazwc.com
 * @company xxx公司
 * @create  2022-08-15 21:13
 */
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations={"classpath:applicationContext-mybatis.xml"})
public class OrderItemBizImplTest {
@Autowired
    private OrderItemBiz orderItemBiz;
 
    @Test
    public void queryOrderItemVoByOrderItemId() {
        OrderItemVo orderItemVo = orderItemBiz.queryOrderItemVoByOrderItemId(9);
        System.out.println(orderItemVo);
      
    }
}

运行结果：


package com.zwc.ssm.biz.impl;
 
import com.zwc.ssm.biz.OrderItemBiz;
import com.zwc.ssm.model.vo.OrderItemVo;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
 
/**
 * @authorzwc
 * @site www.javazwc.com
 * @company xxx公司
 * @create  2022-08-15 21:13
 */
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations={"classpath:applicationContext-mybatis.xml"})
public class OrderItemBizImplTest {
@Autowired
    private OrderItemBiz orderItemBiz;
 
    @Test
    public void queryOrderItemVoByOrderItemId() {
        OrderItemVo orderItemVo = orderItemBiz.queryOrderItemVoByOrderItemId(43);
        System.out.println(orderItemVo);
        //通过订单详细拿到订单
        System.out.println(orderItemVo.getOrder());
 
    }
}

运行结果：

jpa 关联映射jpa 关联映射jpa 关联映射

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二、多对多关联关系

HbookCategoryMapper：


<resultMap id="HbookVoMap" type="com.zwc.ssm.model.vo.HbookVo">
    <result property="bookId" column="book_id">result>
    <result property="bookName" column="book_name">result>
    <collection property="categories" ofType="com.zwc.ssm.model.Category">
      <result property="categoryId" column="category_id">result>
      <result property="categoryName" column="category_name">result>
    collection>
  resultMap>
 
  <resultMap id="CategoryVoMap" type="com.zwc.ssm.model.vo.CategoryVo">
    <result property="categoryId" column="category_id">result>
    <result property="categoryName" column="category_name">result>
    <collection property="hbooks" ofType="com.zwc.ssm.model.Hbook">
      <result property="bookId" column="book_id">result>
      <result property="bookName" column="book_name">result>
    collection>
  resultMap>
 
  <select id="queryByBookId" 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 = #{bookId}
 select>
  <select id="queryByCid" 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:


package com.zwc.ssm.mapper;
 
import com.zwc.ssm.model.Hbook;
 
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);
}

HbookCategoryMapper:


package com.zwc.ssm.mapper;
 
import com.zwc.ssm.model.HbookCategory;
import com.zwc.ssm.model.vo.CategoryVo;
import com.zwc.ssm.model.vo.HbookVo;
import org.apache.ibatis.annotations.Param;
 
public interface HbookCategoryMapper {
    int deleteByPrimaryKey(Integer bcid);
 
    int insert(HbookCategory record);
 
    int insertSelective(HbookCategory record);
 
    HbookCategory selectByPrimaryKey(Integer bcid);
 
    int updateByPrimaryKeySelective(HbookCategory record);
 
    int updateByPrimaryKey(HbookCategory record);
 
    HbookVo queryByBookId(@Param("bookId") Integer bookId);
 
    CategoryVo queryByCid(@Param("cid") Integer cid);
}

CategoryMapper：


package com.zwc.ssm.mapper;
 
import com.zwc.ssm.model.Category;
 
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);
}

HbookVo:


package com.zwc.ssm.model.vo;
 
import com.zwc.ssm.model.Category;
import com.zwc.ssm.model.Hbook;
 
import java.util.List;
 
/**
 * @authorzwc
 * @site www.javazwc.com
 * @company xxx公司
 * @create  2022-08-16 0:01
 */
public class HbookVo extends Hbook {
    private List categories;
 
    public List getCategories() {
        return categories;
    }
 
    public void setCategories(List categories) {
        this.categories = categories;
    }
}

CategoryVo：


package com.zwc.ssm.model.vo;
 
import com.zwc.ssm.model.Category;
import com.zwc.ssm.model.Hbook;
 
import java.util.List;
 
/**
 * @authorzwc
 * @site www.javazwc.com
 * @company xxx公司
 * @create  2022-08-16 0:03
 */
public class CategoryVo  extends Category {
    private List hbooks;
 
    public List getHbooks() {
        return hbooks;
    }
 
    public void setHbooks(List hbooks) {
        this.hbooks = hbooks;
    }
}

HbookCategoryBiz：


package com.zwc.ssm.biz;
 
import com.zwc.ssm.model.HbookCategory;
import com.zwc.ssm.model.vo.CategoryVo;
import com.zwc.ssm.model.vo.HbookVo;
 
public interface HbookCategoryBiz {
    int deleteByPrimaryKey(Integer bcid);
 
    int insert(HbookCategory record);
 
    int insertSelective(HbookCategory record);
 
    HbookCategory selectByPrimaryKey(Integer bcid);
 
    int updateByPrimaryKeySelective(HbookCategory record);
 
    int updateByPrimaryKey(HbookCategory record);
 
    HbookVo queryByBookId(Integer bookId);
 
    CategoryVo queryByCid(Integer cid);
}

HbookCategoryBizImpl：


package com.zwc.ssm.biz.impl;
 
import com.zwc.ssm.biz.HbookCategoryBiz;
import com.zwc.ssm.mapper.HbookCategoryMapper;
import com.zwc.ssm.model.HbookCategory;
import com.zwc.ssm.model.vo.CategoryVo;
import com.zwc.ssm.model.vo.HbookVo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
 
/**
 * @authorzwc
 * @site www.javazwc.com
 * @company xxx公司
 * @create  2022-08-16 0:09
 */
@Service
public class HbookCategoryBizImpl implements HbookCategoryBiz {
    @Autowired
 
    private HbookCategoryMapper hbookCategoryMapper;
 
    @Override
    public int deleteByPrimaryKey(Integer bcid) {
        return 0;
    }
 
    @Override
    public int insert(HbookCategory record) {
        return 0;
    }
 
    @Override
    public int insertSelective(HbookCategory record) {
        return 0;
    }
 
    @Override
    public HbookCategory selectByPrimaryKey(Integer bcid) {
        return null;
    }
 
    @Override
    public int updateByPrimaryKeySelective(HbookCategory record) {
        return 0;
    }
 
    @Override
    public int updateByPrimaryKey(HbookCategory record) {
        return 0;
    }
 
    @Override
    public HbookVo queryByBookId(Integer bookId) {
 
        return hbookCategoryMapper.queryByBookId(bookId);
    }
 
    @Override
    public CategoryVo queryByCid(Integer cid) {
 
        return hbookCategoryMapper.queryByCid(cid);
    }
}

Spring+Hibernate 多对多关联映射---教师与学生表的级联增删改查

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需求一：根据书籍ID，查询书籍信息及所属所有类别信息


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 = #{bookId}

HbookCategoryBizImplTest：


@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations={"classpath:applicationContext-mybatis.xml"})
public class HbookCategoryBizImplTest {
    @Autowired
 
    private HbookCategoryBiz hbookCategoryBiz;
 
    @Test
    public void queryByBookId() {
        HbookVo hbookVo = hbookCategoryBiz.queryByBookId(8);
        System.out.println(hbookVo);
        hbookVo.getCategories().forEach(System.out::println);
    }

运行结果

需求二：根据类别ID，查询类别信息及所包含书籍信息


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}


package com.zwc.ssm.biz.impl;
 
import com.zwc.ssm.biz.HbookCategoryBiz;
import com.zwc.ssm.model.vo.CategoryVo;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
 
/**
 * @authorzwc
 * @site www.javazwc.com
 * @company xxx公司
 * @create  2022-08-16 0:11
 */
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations={"classpath:applicationContext-mybatis.xml"})
public class HbookCategoryBizImplTest {
    @Autowired
 
    private HbookCategoryBiz hbookCategoryBiz;
 
   
 
    @Test
    public void queryByCid() {
        CategoryVo categoryVo = hbookCategoryBiz.queryByCid(8);
        System.out.println(categoryVo);
        categoryVo.getHbooks().forEach(System.out::println);
    }
}

运行结果：

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原文地址：https://blog.csdn.net/qq_65345936/article/details/126353792