• mybatis（关联关系映射）

    目录

    一、一对多关联关系

     二、多对多关联关系

    一、一对多关联关系

     什么叫一对多？

    比如：一个订单对应多个订单项

    1、先用逆向生成工具生成t_hibernate_order（订单）、t_hibernate_order_item（订单项）

    generatorConfig.xml 

    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="E:\\maven\\maven_ localRepository\\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.cxy.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.cxy.mapper"
    46.                          targetProject="src/main/java">
    47.             
    48.             <property name="enableSubPackages" value="false"/>
    49.         sqlMapGenerator>
    50.  
    51.         
    52.         
    53.         
    54.         
    55.         <javaClientGenerator targetPackage="com.cxy.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.         <table schema="" tableName="t_mvc_book" domainObjectName="Book"
    76.                enableCountByExample="false" enableDeleteByExample="false"
    77.                enableSelectByExample="false" enableUpdateByExample="false">
    78.         table>
    79.  
    80.         <table schema="" tableName="t_hibernate_order" domainObjectName="Order"
    81.                enableCountByExample="false" enableDeleteByExample="false"
    82.                enableSelectByExample="false" enableUpdateByExample="false">
    83.         table>
    84.  
    85.         <table schema="" tableName="t_hibernate_order_item" domainObjectName="OrderItem"
    86.                enableCountByExample="false" enableDeleteByExample="false"
    87.                enableSelectByExample="false" enableUpdateByExample="false">
    88.         table>
    89.  
    90.     context>
    91. generatorConfiguration>

    OrderMapper.xml 

    2. mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
    3. <mapper namespace="com.cxy.mapper.OrderMapper" >
    4.   <resultMap id="BaseResultMap" type="com.cxy.model.Order" >
    5.     <constructor >
    6.       <idArg column="order_id" jdbcType="INTEGER" javaType="java.lang.Integer" />
    7.       <arg column="order_no" jdbcType="VARCHAR" javaType="java.lang.String" />
    8.     constructor>
    9.   resultMap>
    10.  
    11.   <resultMap id="OrderVoMap" type="com.cxy.model.vo.OrderVo" >
    12.     <result property="orderId" column="order_id">result>
    13.     <result property="orderNo" column="order_no">result>
    14.     <collection property="orderItems" ofType="com.cxy.model.OrderItem">
    15.       <result property="orderItemId" column="order_item_id">result>
    16.       <result property="oid" column="oid">result>
    17.       <result property="productId" column="product_id">result>
    18.       <result property="quantity" column="quantity">result>
    19.     collection>
    20.   resultMap>
    21.  
    22.  
    23.   <sql id="Base_Column_List" >
    24.     order_id, order_no
    25.   sql>
    26.  
    27.   <select id="queryOrderVoByOrderId" resultMap="OrderVoMap" parameterType="java.lang.Integer">
    28.    select * from t_hibernate_order o,t_hibernate_order_item oi
    29.     where o.order_id = oi.oid
    30.     and o.order_id = #{orderId}
    31. select>
    32.  
    33.   <select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Integer" >
    34.     select 
    35.     <include refid="Base_Column_List" />
    36.     from t_hibernate_order
    37.     where order_id = #{orderId,jdbcType=INTEGER}
    38.   select>
    39.  
    40.  
    41.   <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer" >
    42.     delete from t_hibernate_order
    43.     where order_id = #{orderId,jdbcType=INTEGER}
    44.   delete>
    45.   <insert id="insert" parameterType="com.cxy.model.Order" >
    46.     insert into t_hibernate_order (order_id, order_no)
    47.     values (#{orderId,jdbcType=INTEGER}, #{orderNo,jdbcType=VARCHAR})
    48.   insert>
    49.   <insert id="insertSelective" parameterType="com.cxy.model.Order" >
    50.     insert into t_hibernate_order
    51.     <trim prefix="(" suffix=")" suffixOverrides="," >
    52.       <if test="orderId != null" >
    53.         order_id,
    54.       if>
    55.       <if test="orderNo != null" >
    56.         order_no,
    57.       if>
    58.     trim>
    59.     <trim prefix="values (" suffix=")" suffixOverrides="," >
    60.       <if test="orderId != null" >
    61.         #{orderId,jdbcType=INTEGER},
    62.       if>
    63.       <if test="orderNo != null" >
    64.         #{orderNo,jdbcType=VARCHAR},
    65.       if>
    66.     trim>
    67.   insert>
    68.   <update id="updateByPrimaryKeySelective" parameterType="com.cxy.model.Order" >
    69.     update t_hibernate_order
    70.     <set >
    71.       <if test="orderNo != null" >
    72.         order_no = #{orderNo,jdbcType=VARCHAR},
    73.       if>
    74.     set>
    75.     where order_id = #{orderId,jdbcType=INTEGER}
    76.   update>
    77.   <update id="updateByPrimaryKey" parameterType="com.cxy.model.Order" >
    78.     update t_hibernate_order
    79.     set order_no = #{orderNo,jdbcType=VARCHAR}
    80.     where order_id = #{orderId,jdbcType=INTEGER}
    81.   update>
    82. mapper>

    orderBiz.java

    1. package com.cxy.biz;
    2.  
    3. import com.cxy.model.Order;
    4. import com.cxy.model.vo.OrderVo;
    5. import org.apache.ibatis.annotations.Param;
    6.  
    7. public interface OrderBiz {
    8.     int deleteByPrimaryKey(Integer orderId);
    9.  
    10.     int insert(Order record);
    11.  
    12.     int insertSelective(Order record);
    13.  
    14.     Order selectByPrimaryKey(Integer orderId);
    15.  
    16.     int updateByPrimaryKeySelective(Order record);
    17.  
    18.     int updateByPrimaryKey(Order record);
    19.  
    20.     OrderVo queryOrderVoByOrderId(@Param("orderId") Integer orderId);
    21. }

    orderBizImpl.java

    1. package com.cxy.biz.impl;
    2.  
    3. import com.cxy.biz.OrderBiz;
    4. import com.cxy.mapper.OrderMapper;
    5. import com.cxy.model.Order;
    6. import com.cxy.model.vo.OrderVo;
    7. import org.springframework.beans.factory.annotation.Autowired;
    8. import org.springframework.stereotype.Service;
    9.  
    10. @Service
    11. public class OrderBizImpl implements OrderBiz {
    12.     @Autowired
    13.     private OrderMapper orderMapper ;
    14.  
    15.     @Override
    16.     public int deleteByPrimaryKey(Integer orderId) {
    17.         return orderMapper.deleteByPrimaryKey(orderId);
    18.     }
    19.  
    20.     @Override
    21.     public int insert(Order record) {
    22.         return orderMapper.insert(record);
    23.     }
    24.  
    25.     @Override
    26.     public int insertSelective(Order record) {
    27.         return orderMapper.insertSelective(record);
    28.     }
    29.  
    30.     @Override
    31.     public Order selectByPrimaryKey(Integer orderId) {
    32.         return orderMapper.selectByPrimaryKey(orderId);
    33.     }
    34.  
    35.     @Override
    36.     public int updateByPrimaryKeySelective(Order record) {
    37.         return orderMapper.updateByPrimaryKeySelective(record);
    38.     }
    39.  
    40.     @Override
    41.     public int updateByPrimaryKey(Order record) {
    42.         return orderMapper.updateByPrimaryKey(record);
    43.     }
    44.  
    45.     @Override
    46.     public OrderVo queryOrderVoByOrderId(Integer orderId) {
    47.         return orderMapper.queryOrderVoByOrderId(orderId);
    48.     }
    49. }

    OrderitemMapper.xml

    2. mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
    3. <mapper namespace="com.cxy.mapper.OrderItemMapper" >
    4.   <resultMap id="BaseResultMap" type="com.cxy.model.OrderItem" >
    5.     <constructor >
    6.       <idArg column="order_item_id" jdbcType="INTEGER" javaType="java.lang.Integer" />
    7.       <arg column="product_id" jdbcType="INTEGER" javaType="java.lang.Integer" />
    8.       <arg column="quantity" jdbcType="INTEGER" javaType="java.lang.Integer" />
    9.       <arg column="oid" jdbcType="INTEGER" javaType="java.lang.Integer" />
    10.     constructor>
    11.   resultMap>
    12.  
    13.   <resultMap id="OrderVoMap" type="com.cxy.model.vo.OrderItemVo" >
    14.     <result property="orderItemId" column="order_item_id">result>
    15.     <result property="oid" column="oid">result>
    16.     <result property="productId" column="product_id">result>
    17.     <result property="quantity" column="quantity">result>
    18.     <association property="order" javaType="com.cxy.model.Order">
    19.       <result property="orderId" column="order_id">result>
    20.       <result property="orderNo" column="order_no">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="queryOrderItemVoByOrderItemId" resultMap="OrderVoMap" parameterType="java.lang.Integer">
    29.    select * from t_hibernate_order o,t_hibernate_order_item oi
    30.     where o.order_id = oi.oid
    31.     and oi.order_item_id = #{orderItemId}
    32. select>
    33.  
    34.  
    35.   <select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Integer" >
    36.     select 
    37.     <include refid="Base_Column_List" />
    38.     from t_hibernate_order_item
    39.     where order_item_id = #{orderItemId,jdbcType=INTEGER}
    40.   select>
    41.   <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer" >
    42.     delete from t_hibernate_order_item
    43.     where order_item_id = #{orderItemId,jdbcType=INTEGER}
    44.   delete>
    45.   <insert id="insert" parameterType="com.cxy.model.OrderItem" >
    46.     insert into t_hibernate_order_item (order_item_id, product_id, quantity, 
    47.       oid)
    48.     values (#{orderItemId,jdbcType=INTEGER}, #{productId,jdbcType=INTEGER}, #{quantity,jdbcType=INTEGER}, 
    49.       #{oid,jdbcType=INTEGER})
    50.   insert>
    51.   <insert id="insertSelective" parameterType="com.cxy.model.OrderItem" >
    52.     insert into t_hibernate_order_item
    53.     <trim prefix="(" suffix=")" suffixOverrides="," >
    54.       <if test="orderItemId != null" >
    55.         order_item_id,
    56.       if>
    57.       <if test="productId != null" >
    58.         product_id,
    59.       if>
    60.       <if test="quantity != null" >
    61.         quantity,
    62.       if>
    63.       <if test="oid != null" >
    64.         oid,
    65.       if>
    66.     trim>
    67.     <trim prefix="values (" suffix=")" suffixOverrides="," >
    68.       <if test="orderItemId != null" >
    69.         #{orderItemId,jdbcType=INTEGER},
    70.       if>
    71.       <if test="productId != null" >
    72.         #{productId,jdbcType=INTEGER},
    73.       if>
    74.       <if test="quantity != null" >
    75.         #{quantity,jdbcType=INTEGER},
    76.       if>
    77.       <if test="oid != null" >
    78.         #{oid,jdbcType=INTEGER},
    79.       if>
    80.     trim>
    81.   insert>
    82.   <update id="updateByPrimaryKeySelective" parameterType="com.cxy.model.OrderItem" >
    83.     update t_hibernate_order_item
    84.     <set >
    85.       <if test="productId != null" >
    86.         product_id = #{productId,jdbcType=INTEGER},
    87.       if>
    88.       <if test="quantity != null" >
    89.         quantity = #{quantity,jdbcType=INTEGER},
    90.       if>
    91.       <if test="oid != null" >
    92.         oid = #{oid,jdbcType=INTEGER},
    93.       if>
    94.     set>
    95.     where order_item_id = #{orderItemId,jdbcType=INTEGER}
    96.   update>
    97.   <update id="updateByPrimaryKey" parameterType="com.cxy.model.OrderItem" >
    98.     update t_hibernate_order_item
    99.     set product_id = #{productId,jdbcType=INTEGER},
    100.       quantity = #{quantity,jdbcType=INTEGER},
    101.       oid = #{oid,jdbcType=INTEGER}
    102.     where order_item_id = #{orderItemId,jdbcType=INTEGER}
    103.   update>
    104. mapper>

    orderitemBiz.java

    1. package com.cxy.biz;
    2.  
    3. import com.cxy.model.OrderItem;
    4. import com.cxy.model.vo.OrderItemVo;
    5. import org.apache.ibatis.annotations.Param;
    6.  
    7. public interface OrderItemBia {
    8.     int deleteByPrimaryKey(Integer orderItemId);
    9.  
    10.     int insert(OrderItem record);
    11.  
    12.     int insertSelective(OrderItem record);
    13.  
    14.     OrderItem selectByPrimaryKey(Integer orderItemId);
    15.  
    16.     int updateByPrimaryKeySelective(OrderItem record);
    17.  
    18.     int updateByPrimaryKey(OrderItem record);
    19.  
    20.     OrderItemVo queryOrderItemVoByOrderItemId(@Param("orderItemId") Integer orderItemId);
    21. }

    orderitemBizImpl.java

    1. package com.cxy.biz.impl;
    2.  
    3. import com.cxy.biz.OrderItemBia;
    4. import com.cxy.mapper.OrderItemMapper;
    5. import com.cxy.model.OrderItem;
    6. import com.cxy.model.vo.OrderItemVo;
    7. import org.springframework.beans.factory.annotation.Autowired;
    8. import org.springframework.stereotype.Service;
    9.  
    10. @Service
    11. public class OrderItemBizImpl implements OrderItemBia {
    12.     @Autowired
    13.     private OrderItemMapper orderItemMapper;
    14.  
    15.     @Override
    16.     public int deleteByPrimaryKey(Integer orderItemId) {
    17.         return orderItemMapper.deleteByPrimaryKey(orderItemId);
    18.     }
    19.  
    20.     @Override
    21.     public int insert(OrderItem record) {
    22.         return orderItemMapper.insert(record);
    23.     }
    24.  
    25.     @Override
    26.     public int insertSelective(OrderItem record) {
    27.         return orderItemMapper.insertSelective(record);
    28.     }
    29.  
    30.     @Override
    31.     public OrderItem selectByPrimaryKey(Integer orderItemId) {
    32.         return orderItemMapper.selectByPrimaryKey(orderItemId);
    33.     }
    34.  
    35.     @Override
    36.     public int updateByPrimaryKeySelective(OrderItem record) {
    37.         return orderItemMapper.updateByPrimaryKeySelective(record);
    38.     }
    39.  
    40.     @Override
    41.     public int updateByPrimaryKey(OrderItem record) {
    42.         return orderItemMapper.updateByPrimaryKey(record);
    43.     }
    44.  
    45.     @Override
    46.     public OrderItemVo queryOrderItemVoByOrderItemId(Integer orderItemId) {
    47.         return orderItemMapper.queryOrderItemVoByOrderItemId(orderItemId);
    48.     }
    49. }
    1. package com.cxy.biz.impl;
    2.  
    3. import com.cxy.model.vo.OrderItemVo;
    4. import org.junit.Test;
    5. import org.junit.runner.RunWith;
    6. import org.springframework.beans.factory.annotation.Autowired;
    7. import org.springframework.test.context.ContextConfiguration;
    8. import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
    9.  
    10. import static org.junit.Assert.*;
    11.  
    12. @RunWith(SpringJUnit4ClassRunner.class)
    13. @ContextConfiguration(locations={"classpath:applicationContext-mybatis.xml"})
    14.  
    15. public class OrderItemBizImplTest {
    16.  
    17.     @Autowired
    18.     private OrderItemBizImpl orderItemBizimpl;
    19.  
    20.     @Test
    21.     public void queryOrderItemVoByOrderItemId() {
    22.         OrderItemVo orderitemVo = orderItemBizimpl.queryOrderItemVoByOrderItemId(43);
    23.         System.out.println(orderitemVo);
    24.  
    25.     }
    26. }

     二、多对多关联关系

    什么是多对多？

    比如一本书会包含多种类型（言情，玄幻等），而类型里包含多本书籍

    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

    HbookMapper.xml

    2. mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
    3. <mapper namespace="com.cxy.mapper.HbookMapper" >
    4.   <resultMap id="BaseResultMap" type="com.cxy.model.Hbook" >
    5.     <constructor >
    6.       <idArg column="book_id" jdbcType="INTEGER" javaType="java.lang.Integer" />
    7.       <arg column="book_name" jdbcType="VARCHAR" javaType="java.lang.String" />
    8.       <arg column="price" jdbcType="REAL" javaType="java.lang.Float" />
    9.     constructor>
    10.   resultMap>
    11.   <sql id="Base_Column_List" >
    12.     book_id, book_name, price
    13.   sql>
    14.   <select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Integer" >
    15.     select 
    16.     <include refid="Base_Column_List" />
    17.     from t_hibernate_book
    18.     where book_id = #{bookId,jdbcType=INTEGER}
    19.   select>
    20.   <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer" >
    21.     delete from t_hibernate_book
    22.     where book_id = #{bookId,jdbcType=INTEGER}
    23.   delete>
    24.   <insert id="insert" parameterType="com.cxy.model.Hbook" >
    25.     insert into t_hibernate_book (book_id, book_name, price
    26.       )
    27.     values (#{bookId,jdbcType=INTEGER}, #{bookName,jdbcType=VARCHAR}, #{price,jdbcType=REAL}
    28.       )
    29.   insert>
    30.   <insert id="insertSelective" parameterType="com.cxy.model.Hbook" >
    31.     insert into t_hibernate_book
    32.     <trim prefix="(" suffix=")" suffixOverrides="," >
    33.       <if test="bookId != null" >
    34.         book_id,
    35.       if>
    36.       <if test="bookName != null" >
    37.         book_name,
    38.       if>
    39.       <if test="price != null" >
    40.         price,
    41.       if>
    42.     trim>
    43.     <trim prefix="values (" suffix=")" suffixOverrides="," >
    44.       <if test="bookId != null" >
    45.         #{bookId,jdbcType=INTEGER},
    46.       if>
    47.       <if test="bookName != null" >
    48.         #{bookName,jdbcType=VARCHAR},
    49.       if>
    50.       <if test="price != null" >
    51.         #{price,jdbcType=REAL},
    52.       if>
    53.     trim>
    54.   insert>
    55.   <update id="updateByPrimaryKeySelective" parameterType="com.cxy.model.Hbook" >
    56.     update t_hibernate_book
    57.     <set >
    58.       <if test="bookName != null" >
    59.         book_name = #{bookName,jdbcType=VARCHAR},
    60.       if>
    61.       <if test="price != null" >
    62.         price = #{price,jdbcType=REAL},
    63.       if>
    64.     set>
    65.     where book_id = #{bookId,jdbcType=INTEGER}
    66.   update>
    67.   <update id="updateByPrimaryKey" parameterType="com.cxy.model.Hbook" >
    68.     update t_hibernate_book
    69.     set book_name = #{bookName,jdbcType=VARCHAR},
    70.       price = #{price,jdbcType=REAL}
    71.     where book_id = #{bookId,jdbcType=INTEGER}
    72.   update>
    73. mapper>

    HbookCategoryBiz.java 

    1. package com.cxy.biz;
    2.  
    3. import com.cxy.model.HbookCategory;
    4. import com.cxy.model.vo.CategoryVo;
    5. import com.cxy.model.vo.HbookVo;
    6.  
    7. public interface HbookCategoryBiz {
    8.  
    9.     int deleteByPrimaryKey(Integer bcid);
    10.  
    11.     int insert(HbookCategory record);
    12.  
    13.     int insertSelective(HbookCategory record);
    14.  
    15.     HbookCategory selectByPrimaryKey(Integer bcid);
    16.  
    17.     int updateByPrimaryKeySelective(HbookCategory record);
    18.  
    19.     int updateByPrimaryKey(HbookCategory record);
    20.  
    21.     HbookVo queryByBookId( Integer bookId);
    22.  
    23.     CategoryVo queryByCid( Integer cid);
    24.  
    25. }

    HbookCategoryBizImpl .java 

    1. package com.cxy.biz.impl;
    2.  
    3. import com.cxy.biz.HbookCategoryBiz;
    4. import com.cxy.mapper.HbookCategoryMapper;
    5. import com.cxy.model.HbookCategory;
    6. import com.cxy.model.vo.CategoryVo;
    7. import com.cxy.model.vo.HbookVo;
    8. import org.springframework.beans.factory.annotation.Autowired;
    9. import org.springframework.stereotype.Service;
    10.  
    11. @Service
    12. public class HbookCategoryBizImpl implements HbookCategoryBiz {
    13.     @Autowired
    14.     private HbookCategoryMapper hbookCategoryMapper;
    15.     
    16.     @Override
    17.     public HbookVo queryByBookId(Integer bookId) {
    18.         return hbookCategoryMapper.queryByBookId(bookId);
    19.     }
    20.  
    21.     @Override
    22.     public CategoryVo queryByCid(Integer cid) {
    23.         return hbookCategoryMapper.queryByCid(cid);
    24.     }
    25. }
    1. package com.cxy.biz.impl;
    2.  
    3. import com.cxy.biz.HbookCategoryBiz;
    4. import com.cxy.model.vo.CategoryVo;
    5. import com.cxy.model.vo.HbookVo;
    6. import org.junit.Test;
    7. import org.junit.runner.RunWith;
    8. import org.springframework.beans.factory.annotation.Autowired;
    9. import org.springframework.test.context.ContextConfiguration;
    10. import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
    11.  
    12. import static org.junit.Assert.*;
    13.  
    14.  
    15. @RunWith(SpringJUnit4ClassRunner.class)
    16. @ContextConfiguration(locations={"classpath:applicationContext-mybatis.xml"})
    17.  
    18. public class HbookCategoryBizImplTest {
    19.     @Autowired
    20.     private HbookCategoryBiz hbookCategoryBiz;
    21.  
    22.     @Test
    23.     public void queryByBookId() {
    24.         HbookVo hbookVo =  hbookCategoryBiz.queryByBookId(8);
    25.         System.out.println(hbookVo);
    26.         hbookVo.getCategories().forEach(System.out::println);
    27.     }
    28.  
    29.     @Test
    30.     public void queryByCid() {
    31.         CategoryVo categoryVo = hbookCategoryBiz.queryByCid(8);
    32.         System.out.println(categoryVo);
    33.         categoryVo.getHbooks().forEach(System.out::println);
    34.  
    35.     }
    36. }

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  • 原文地址：https://blog.csdn.net/m0_62528678/article/details/126353430