• Mybatis--关联关系映射

    目录

    一、一对多关联关系

    概念

     逆向生成所需要的实体类与配置

    创建两个Vo类

    实体类

     一对一

    ​编辑

     一对多

     二、多对多

    一、一对多关联关系

    概念

     逆向生成所需要的实体类与配置

    generatorConfig.xml

    1. "1.0" encoding="UTF-8" ?>
    2. generatorConfiguration PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
    3.         "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd" >
    4. <generatorConfiguration>
    5.     
    6.     <properties resource="jdbc.properties"/>
    7.  
    8.     
    9.     <classPathEntry location="D:\\SoftwareInstallPath\\repository\\mvn_repository\\mysql\\mysql-connector-java\\5.1.44\\mysql-connector-java-5.1.44.jar"/>
    10.  
    11.     
    12.     <context id="infoGuardian">
    13.         
    14.         <commentGenerator>
    15.             <property name="suppressAllComments" value="true"/>
    16.             <property name="suppressDate" value="true"/> 
    17.         commentGenerator>
    18.  
    19.         
    20.         <jdbcConnection driverClass="${jdbc.driver}"
    21.                         connectionURL="${jdbc.url}" userId="${jdbc.username}" password="${jdbc.password}"/>
    22.  
    23.         
    24.         <javaTypeResolver>
    25.             
    26.             <property name="forceBigDecimals" value="false"/>
    27.         javaTypeResolver>
    28.  
    29.         
    30.         
    31.         
    32.         <javaModelGenerator targetPackage="com.ouyang.ssm.Biz.model"
    33.                             targetProject="src/main/java">
    34.             
    35.             <property name="enableSubPackages" value="false"/>
    36.             
    37.             <property name="constructorBased" value="true"/>
    38.             
    39.             <property name="trimStrings" value="false"/>
    40.             
    41.             <property name="immutable" value="false"/>
    42.         javaModelGenerator>
    43.  
    44.         
    45.         <sqlMapGenerator targetPackage="com.ouyang.ssm.Biz.mapper"
    46.                          targetProject="src/main/java">
    47.             
    48.             <property name="enableSubPackages" value="false"/>
    49.         sqlMapGenerator>
    50.  
    51.         
    52.         
    53.         
    54.         
    55.         <javaClientGenerator targetPackage="com.ouyang.ssm.Biz.mapper"
    56.                              targetProject="src/main/java" type="XMLMAPPER">
    57.             
    58.             <property name="enableSubPackages" value="false"/>
    59.         javaClientGenerator>
    60.  
    61.         
    62.         
    63.         
    64.         
    65.         
    66.         
    67.         
    68.         
    69.         
    70.         
    71.         
    72.         
    73.         
    74.  
    75.         
    76.  
    77.         <table schema="" tableName="t_hibernate_order" domainObjectName="Order"
    78.                enableCountByExample="false" enableDeleteByExample="false"
    79.                enableSelectByExample="false" enableUpdateByExample="false">
    80.         table>
    81.  
    82.         <table schema="" tableName="t_hibernate_order_item" domainObjectName="OrderItem"
    83.                enableCountByExample="false" enableDeleteByExample="false"
    84.                enableSelectByExample="false" enableUpdateByExample="false">
    85.         table>
    86.  
    87.     context>
    88. generatorConfiguration>

    创建两个Vo类

    vo类
    view Object：视图对象

    OrderVo

    1. package com.ouyang.ssm.Biz.model.vo;
    2.  
    3. import com.ouyang.ssm.Biz.model.Order;
    4. import com.ouyang.ssm.Biz.model.OrderItem;
    5.  
    6. import java.util.List;
    7.  
    8. /**
    9.  * @author oyang
    10.  * @site https://blog.csdn.net
    11.  * @qq 1828190940
    12.  * @create  2022-08-16 11:44
    13.  *
    14.  * vo类不仅仅包含当前表的信息，还能包含相关联表的信息
    15.  *
    16.  * 当前订单可能会有一个或多个订单项，多个订单项必须要用集合进行接收
    17.  */
    18.  
    19. public class OrderVo extends Order {
    20.     //通过订单号查询本次订单的详细信息以及对应所有订单
    21.     private List orderItems;
    22.  
    23.     public List getOrderItems() {
    24.         return orderItems;
    25.     }
    26.  
    27.     public void setOrderItems(List orderItems) {
    28.         this.orderItems = orderItems;
    29.     }
    30. }

    OrderItemVo

    1. package com.ouyang.ssm.Biz.model.vo;
    2.  
    3. import com.ouyang.ssm.Biz.model.Order;
    4.  
    5. /**
    6.  * @author oyang
    7.  * @site https://blog.csdn.net
    8.  * @qq 1828190940
    9.  * @create  2022-08-16 11:47
    10.  *
    11.  * 某一个订单项一定属于某个订单的
    12.  *
    13.  */
    14. public class OrderItemVo {
    15.     private Order order;
    16.  
    17.     public Order getOrder() {
    18.         return order;
    19.     }
    20.  
    21.     public void setOrder(Order order) {
    22.         this.order = order;
    23.     }
    24. }

    实体类

    @Data相当于添加了set/get/tostr方法
    @NoArgsConstructor //无参构造器
    @AllArgsConstructor //有参构造器

    @ToString //toString

    1. package com.ouyang.ssm.Biz.model;
    2.  
    3. import lombok.Data;
    4.  
    5. //t_hibernate_order
    6. //@Data相当于添加了set/get/tostr方法
    7. //@NoArgsConstructor //无参构造器
    8. //@AllArgsConstructor //有参构造器
    9. @Data
    10. public class Order {
    11.     private String orderId;
    12.  
    13.     private String orderNo;
    14.  
    15.    /* public Order(String orderId, String orderNo) {
    16.         this.orderId = orderId;
    17.         this.orderNo = orderNo;
    18.     }
    20.     public Order() {
    21.         super();
    22.     }
    24.     public String getOrderId() {
    25.         return orderId;
    26.     }
    28.     public void setOrderId(String orderId) {
    29.         this.orderId = orderId;
    30.     }
    32.     public String getOrderNo() {
    33.         return orderNo;
    34.     }
    36.     public void setOrderNo(String orderNo) {
    37.         this.orderNo = orderNo;
    38.     }*/
    39. }
    1. package com.ouyang.ssm.Biz.model;
    2.  
    3. import lombok.ToString;
    4.  
    5. @ToString
    6. public class OrderItem {
    7.     private String orderItemId;
    8.  
    9.     private String productId;
    10.  
    11.     private String quantity;
    12.  
    13.     private String oid;
    14.  
    15.     public OrderItem(String orderItemId, String productId, String quantity, String oid) {
    16.         this.orderItemId = orderItemId;
    17.         this.productId = productId;
    18.         this.quantity = quantity;
    19.         this.oid = oid;
    20.     }
    21.  
    22.     public OrderItem() {
    23.         super();
    24.     }
    25.  
    26.     public String getOrderItemId() {
    27.         return orderItemId;
    28.     }
    29.  
    30.     public void setOrderItemId(String orderItemId) {
    31.         this.orderItemId = orderItemId;
    32.     }
    33.  
    34.     public String getProductId() {
    35.         return productId;
    36.     }
    37.  
    38.     public void setProductId(String productId) {
    39.         this.productId = productId;
    40.     }
    41.  
    42.     public String getQuantity() {
    43.         return quantity;
    44.     }
    45.  
    46.     public void setQuantity(String quantity) {
    47.         this.quantity = quantity;
    48.     }
    49.  
    50.     public String getOid() {
    51.         return oid;
    52.     }
    53.  
    54.     public void setOid(String oid) {
    55.         this.oid = oid;
    56.     }
    57. }

     一对一

    一条记录属于哪一条主记录的从记录

    修改OrderMapper.xml

    1. "1.0" encoding="UTF-8" ?>
    2. mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
    3. <mapper namespace="com.ouyang.ssm.Biz.mapper.OrderMapper" >
    4.   <resultMap id="BaseResultMap" type="com.ouyang.ssm.Biz.model.Order" >
    5.     <constructor >
    6.       <arg column="order_id" jdbcType="VARCHAR" javaType="java.lang.String" />
    7.       <arg column="order_no" jdbcType="VARCHAR" javaType="java.lang.String" />
    8.     constructor>
    9.   resultMap>
    10.  
    11.   <resultMap id="OrderVoMap" type="com.ouyang.ssm.Biz.model.vo.OrderVo" >
    12.     <result column="order_id" property="orderId">result>
    13.     <result column="order_no" property="orderNo">result>
    14.     <collection property="orderItems" ofType="com.ouyang.ssm.Biz.model.OrderItem">
    15.     <result column="order_item_id" property="orderItemId">result>
    16.     <result column="product_id" property="productId">result>
    17.     <result column="quantity" property="quantity">result>
    18.     <result column="oid" property="oid">result>
    19.     collection>
    20.   resultMap>
    21.  
    22.   <sql id="Base_Column_List">
    23.         order_id,order_no
    24.   sql>
    25.    <select id="queryOrderVoByOrderId" resultMap="OrderVoMap" parameterType="java.lang.Integer">
    26.      select * from t_hibernate_order o,t_hibernate_order_item oi
    27.       where o.order_id = oi.oid and o.order_id=#{orderId}
    28.    select>
    29.   <insert id="insert" parameterType="com.ouyang.ssm.Biz.model.Order" >
    30.     insert into t_hibernate_order (order_id, order_no)
    31.     values (#{orderId,jdbcType=VARCHAR}, #{orderNo,jdbcType=VARCHAR})
    32.   insert>
    33.   <insert id="insertSelective" parameterType="com.ouyang.ssm.Biz.model.Order" >
    34.     insert into t_hibernate_order
    35.     <trim prefix="(" suffix=")" suffixOverrides="," >
    36.       <if test="orderId != null" >
    37.         order_id,
    38.       if>
    39.       <if test="orderNo != null" >
    40.         order_no,
    41.       if>
    42.     trim>
    43.     <trim prefix="values (" suffix=")" suffixOverrides="," >
    44.       <if test="orderId != null" >
    45.         #{orderId,jdbcType=VARCHAR},
    46.       if>
    47.       <if test="orderNo != null" >
    48.         #{orderNo,jdbcType=VARCHAR},
    49.       if>
    50.     trim>
    51.   insert>
    52. mapper>

    OrderMapper

    1. package com.ouyang.ssm.Biz.mapper;
    2.  
    3. import com.ouyang.ssm.Biz.model.vo.OrderVo;
    4. import org.apache.ibatis.annotations.Param;
    5.  
    6. public interface OrderMapper {
    7.  
    8.     OrderVo queryOrderVoByOrderId(@Param("orderId") Integer orderId);
    9. }

    OrederBiz接口

    1. package com.ouyang.ssm.Biz;
    2.  
    3. import com.ouyang.ssm.Biz.model.vo.OrderVo;
    4.  
    5. /**
    6.  * @author oyang
    7.  * @site https://blog.csdn.net
    8.  * @qq 1828190940
    9.  * @create  2022-08-16 12:02
    10.  */
    11. public interface OrderBiz {
    12.     OrderVo queryOrderVoByOrderId(Integer orderId);
    13.  
    14. }

    OrderBizImpl 实现Oreder接口 

    1. package com.ouyang.ssm.Biz.impl;
    2.  
    3. import com.ouyang.ssm.Biz.OrderBiz;
    4. import com.ouyang.ssm.Biz.mapper.OrderMapper;
    5. import com.ouyang.ssm.Biz.model.Order;
    6. import com.ouyang.ssm.Biz.model.vo.OrderVo;
    7. import org.springframework.beans.factory.annotation.Autowired;
    8. import org.springframework.stereotype.Service;
    9.  
    10. /**
    11.  * @author oyang
    12.  * @site https://blog.csdn.net
    13.  * @qq 1828190940
    14.  * @create  2022-08-16 12:04
    15.  */
    16. @Service
    17. public class OrderBizImpl implements OrderBiz {
    18.     @Autowired
    19.     private OrderMapper orderMapper;
    20.     @Override
    21.     public OrderVo queryOrderVoByOrderId(Integer orderId) {
    22.         return orderMapper.queryOrderVoByOrderId(orderId);
    23.     }
    24. }

    测试

    jpa 关联映射jpa 关联映射jpa 关联映射
    application/pdf 0星 超过10%的资源 515KB
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    1. package com.ouyang.ssm.Biz.impl;
    2.  
    3. import com.ouyang.ssm.Biz.OrderBiz;
    4. import com.ouyang.ssm.Biz.model.vo.OrderVo;
    5. import org.junit.Test;
    6. import org.junit.runner.RunWith;
    7. import org.springframework.beans.factory.annotation.Autowired;
    8. import org.springframework.test.context.ContextConfiguration;
    9. import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
    10.  
    11. /**
    12.  * @author oyang
    13.  * @site https://blog.csdn.net
    14.  * @qq 1828190940
    15.  * @create  2022-08-16 12:16
    16.  */
    17. @RunWith(SpringJUnit4ClassRunner.class)
    18. @ContextConfiguration(locations={"classpath:applocationContext-mybatis.xml"})
    19. public class OrderBizImplTest {
    20.     @Autowired
    21.    private   OrderBiz orderBiz;
    22.     @Test
    23.     public void queryOrderVoByOrderId() {
    24.         OrderVo orderVo = orderBiz.queryOrderVoByOrderId(9);
    25.         System.out.println(orderVo);
    26.     }
    27. }

     一对多

    修改OrderItemMapper.xml

    1. "1.0" encoding="UTF-8" ?>
    2. mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
    3. <mapper namespace="com.ouyang.ssm.Biz.mapper.OrderItemMapper" >
    4.   <resultMap id="BaseResultMap" type="com.ouyang.ssm.Biz.model.OrderItem" >
    5.     <constructor >
    6.       <arg column="order_item_id" jdbcType="VARCHAR" javaType="java.lang.String" />
    7.       <arg column="product_id" jdbcType="VARCHAR" javaType="java.lang.String" />
    8.       <arg column="quantity" jdbcType="VARCHAR" javaType="java.lang.String" />
    9.       <arg column="oid" jdbcType="VARCHAR" javaType="java.lang.String" />
    10.     constructor>
    11.   resultMap>
    12.  
    13.   <resultMap id="OrderItemVoMap" type="com.ouyang.ssm.Biz.model.vo.OrderItemVo" >
    14.     <result column="order_item_id" property="orderItemId">result>
    15.     <result column="product_id" property="productId">result>
    16.     <result column="quantity" property="quantity">result>
    17.     <result column="oid" property="oid">result>
    18.     <association property="order" javaType="com.ouyang.ssm.Biz.model.Order">
    19.       <result column="order_id" property="orderId">result>
    20.       <result column="order_no" property="orderNo">result>
    21.     association>
    22.   resultMap>
    23.  
    24. <sql id="Base_Column_List">
    25.     order_item_id,product_id,quantity,oid
    26. sql>
    27.  
    28.   <select id="queryOrderVoByOrderItemId" resultMap="OrderItemVoMap" parameterType="java.lang.Integer">
    29.      select * from t_hibernate_order o,t_hibernate_order_item oi
    30.       where o.order_id = oi.oid and oi.order_item_id=#{orderItemId}
    31.    select>
    32.  
    33.   <insert id="insert" parameterType="com.ouyang.ssm.Biz.model.OrderItem" >
    34.     insert into t_hibernate_order_item (order_item_id, product_id, quantity, 
    35.       oid)
    36.     values (#{orderItemId,jdbcType=VARCHAR}, #{productId,jdbcType=VARCHAR}, #{quantity,jdbcType=VARCHAR}, 
    37.       #{oid,jdbcType=VARCHAR})
    38.   insert>
    39.   <insert id="insertSelective" parameterType="com.ouyang.ssm.Biz.model.OrderItem" >
    40.     insert into t_hibernate_order_item
    41.     <trim prefix="(" suffix=")" suffixOverrides="," >
    42.       <if test="orderItemId != null" >
    43.         order_item_id,
    44.       if>
    45.       <if test="productId != null" >
    46.         product_id,
    47.       if>
    48.       <if test="quantity != null" >
    49.         quantity,
    50.       if>
    51.       <if test="oid != null" >
    52.         oid,
    53.       if>
    54.     trim>
    55.     <trim prefix="values (" suffix=")" suffixOverrides="," >
    56.       <if test="orderItemId != null" >
    57.         #{orderItemId,jdbcType=VARCHAR},
    58.       if>
    59.       <if test="productId != null" >
    60.         #{productId,jdbcType=VARCHAR},
    61.       if>
    62.       <if test="quantity != null" >
    63.         #{quantity,jdbcType=VARCHAR},
    64.       if>
    65.       <if test="oid != null" >
    66.         #{oid,jdbcType=VARCHAR},
    67.       if>
    68.     trim>
    69.   insert>
    70. mapper>

    OrderItemMapper

    1. package com.ouyang.ssm.Biz.mapper;
    2.  
    3. import com.ouyang.ssm.Biz.model.OrderItem;
    4. import com.ouyang.ssm.Biz.model.vo.OrderItemVo;
    5. import org.apache.ibatis.annotations.Param;
    6.  
    7. public interface OrderItemMapper {
    8.     int insert(OrderItem record);
    9.  
    10.     int insertSelective(OrderItem record);
    11.  
    12.     OrderItemVo queryOrderVoByOrderItemId(@Param("orderItemId")Integer orderItemId);
    13. }

    OrderItemBiz

    1. package com.ouyang.ssm.Biz;
    2.  
    3. import com.ouyang.ssm.Biz.model.OrderItem;
    4. import com.ouyang.ssm.Biz.model.vo.OrderItemVo;
    5.  
    6. public interface OrderItemBiz {
    7.     int insert(OrderItem record);
    8.  
    9.     int insertSelective(OrderItem record);
    10.  
    11.     OrderItemVo queryOrderVoByOrderItemId(Integer orderItemId);
    12. }

    OrderItemBizImpl  实现OrderItemBiz接口

    1. package com.ouyang.ssm.Biz.impl;
    2.  
    3. import com.ouyang.ssm.Biz.OrderItemBiz;
    4. import com.ouyang.ssm.Biz.model.OrderItem;
    5. import com.ouyang.ssm.Biz.model.vo.OrderItemVo;
    6. import org.springframework.beans.factory.annotation.Autowired;
    7. import org.springframework.stereotype.Service;
    8.  
    9. /**
    10.  * @author oyang
    11.  * @site https://blog.csdn.net
    12.  * @qq 1828190940
    13.  * @create  2022-08-16 12:26
    14.  */
    15. @Service
    16. public class OrderItemBizImpl implements OrderItemBiz {
    17.     @Autowired
    18.     private OrderItemBiz orderItemBiz;
    19.     @Override
    20.     public int insert(OrderItem record) {
    21.         return 0;
    22.     }
    23.  
    24.     @Override
    25.     public int insertSelective(OrderItem record) {
    26.         return 0;
    27.     }
    28.  
    29.     @Override
    30.     public OrderItemVo queryOrderVoByOrderItemId(Integer orderItemId) {
    31.  
    32.         return orderItemBiz.queryOrderVoByOrderItemId(orderItemId);
    33.     }
    34. }

    测试

    1. package com.ouyang.ssm.Biz.impl;
    2.  
    3. import com.ouyang.ssm.Biz.OrderItemBiz;
    4. import com.ouyang.ssm.Biz.model.vo.OrderItemVo;
    5. import org.junit.Test;
    6. import org.junit.runner.RunWith;
    7. import org.springframework.beans.factory.annotation.Autowired;
    8. import org.springframework.test.context.ContextConfiguration;
    9. import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
    10.  
    11. /**
    12.  * @author oyang
    13.  * @site https://blog.csdn.net
    14.  * @qq 1828190940
    15.  * @create  2022-08-16 12:28
    16.  */
    17. @RunWith(SpringJUnit4ClassRunner.class)
    18. @ContextConfiguration(locations={"classpath:applocationContext-mybatis.xml"})
    19. public class OrderItemBizImplTest {
    20.     @Autowired
    21.     private OrderItemBiz orderItemBiz;
    22.  
    23.     @Test
    24.     public void queryOrderVoByOrderItemId() {
    25.         OrderItemVo orderItemVo = orderItemBiz.queryOrderVoByOrderItemId(42);
    26.         System.out.println(orderItemVo);
    27.         System.out.println(orderItemVo.getOrder());
    28.     }
    29. }

     Collection:一对多的一方，对应关联属性用ofType

    Assoctation:一对多的多方，对应关联属性用javaType

     二、多对多

    概念：比如一本书籍有多个类别，多个类别对多本书

    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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     逆向生成所需要的实体类与配置

    generatorConfig.xml

    1. "1.0" encoding="UTF-8" ?>
    2. generatorConfiguration PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
    3.         "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd" >
    4. <generatorConfiguration>
    5.     
    6.     <properties resource="jdbc.properties"/>
    7.  
    8.     
    9.     <classPathEntry location="D:\\SoftwareInstallPath\\repository\\mvn_repository\\mysql\\mysql-connector-java\\5.1.44\\mysql-connector-java-5.1.44.jar"/>
    10.  
    11.     
    12.     <context id="infoGuardian">
    13.         
    14.         <commentGenerator>
    15.             <property name="suppressAllComments" value="true"/>
    16.             <property name="suppressDate" value="true"/> 
    17.         commentGenerator>
    18.  
    19.         
    20.         <jdbcConnection driverClass="${jdbc.driver}"
    21.                         connectionURL="${jdbc.url}" userId="${jdbc.username}" password="${jdbc.password}"/>
    22.  
    23.         
    24.         <javaTypeResolver>
    25.             
    26.             <property name="forceBigDecimals" value="false"/>
    27.         javaTypeResolver>
    28.  
    29.         
    30.         
    31.         
    32.         <javaModelGenerator targetPackage="com.ouyang.ssm.Biz.model"
    33.                             targetProject="src/main/java">
    34.             
    35.             <property name="enableSubPackages" value="false"/>
    36.             
    37.             <property name="constructorBased" value="true"/>
    38.             
    39.             <property name="trimStrings" value="false"/>
    40.             
    41.             <property name="immutable" value="false"/>
    42.         javaModelGenerator>
    43.  
    44.         
    45.         <sqlMapGenerator targetPackage="com.ouyang.ssm.Biz.mapper"
    46.                          targetProject="src/main/java">
    47.             
    48.             <property name="enableSubPackages" value="false"/>
    49.         sqlMapGenerator>
    50.  
    51.         
    52.         
    53.         
    54.         
    55.         <javaClientGenerator targetPackage="com.ouyang.ssm.Biz.mapper"
    56.                              targetProject="src/main/java" type="XMLMAPPER">
    57.             
    58.             <property name="enableSubPackages" value="false"/>
    59.         javaClientGenerator>
    60.  
    61.         
    62.         
    63.         
    64.         
    65.         
    66.         
    67.         
    68.         
    69.         
    70.         
    71.         
    72.         
    73.         
    74.  
    75.         
    76.  
    77.         <table schema="" tableName="t_hibernate_book" domainObjectName="Book"
    78.                enableCountByExample="false" enableDeleteByExample="false"
    79.                enableSelectByExample="false" enableUpdateByExample="false">
    80.         table>
    81.  
    82.         <table schema="" tableName="t_hibernate_category" domainObjectName="Category"
    83.                enableCountByExample="false" enableDeleteByExample="false"
    84.                enableSelectByExample="false" enableUpdateByExample="false">
    85.         table>
    86.  
    87.         <table schema="" tableName="t_hibernate_book_category" domainObjectName="BookCategory"
    88.                enableCountByExample="false" enableDeleteByExample="false"
    89.                enableSelectByExample="false" enableUpdateByExample="false">
    90.         table>
    91.     context>
    92. generatorConfiguration>

     创建三个Vo类

    BookVo 

    1. package com.ouyang.ssm.Biz.model.vo;
    2.  
    3. import com.ouyang.ssm.Biz.model.Book;
    4. import com.ouyang.ssm.Biz.model.Category;
    5.  
    6. import java.util.List;
    7.  
    8. /**
    9.  * @author oyang
    10.  * @site https://blog.csdn.net
    11.  * @qq 1828190940
    12.  * @create  2022-08-17 8:24
    13.  */
    14. public class BookVo extends Book {
    15.     private List categories;
    16.  
    17.     public List getCategories() {
    18.         return categories;
    19.     }
    20.  
    21.     public void setCategories(List categories) {
    22.         this.categories = categories;
    23.     }
    24. }

    CategoryVo  

    1. package com.ouyang.ssm.Biz.model.vo;
    2.  
    3. import com.ouyang.ssm.Biz.model.Book;
    4. import com.ouyang.ssm.Biz.model.Category;
    5.  
    6. import java.util.List;
    7.  
    8. /**
    9.  * @author oyang
    10.  * @site https://blog.csdn.net
    11.  * @qq 1828190940
    12.  * @create  2022-08-17 8:27
    13.  */
    14. public class CategoryVo extends Category {
    15.     private List books;
    16.  
    17.     public List getBooks() {
    18.         return books;
    19.     }
    20.  
    21.     public void setBooks(List books) {
    22.         this.books = books;
    23.     }
    24. }

    BookCategoryVo  

    1. package com.ouyang.ssm.Biz.model.vo;
    2.  
    3. import com.ouyang.ssm.Biz.model.Book;
    4. import com.ouyang.ssm.Biz.model.BookCategory;
    5.  
    6. import java.util.List;
    7.  
    8. /**
    9.  * @author oyang
    10.  * @site https://blog.csdn.net
    11.  * @qq 1828190940
    12.  * @create  2022-08-17 8:25
    13.  */
    14. public class BookCategoryVo extends BookCategory {
    15.     private List books;
    16.  
    17.     public List getBooks() {
    18.         return books;
    19.     }
    20.  
    21.     public void setBooks(List books) {
    22.         this.books = books;
    23.     }
    24. }

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  • 原文地址：https://blog.csdn.net/weixin_65211978/article/details/126362286