关联关系映射

于 2019-10-23 20:25:08 发布
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关联关系映射

1.将数据表导入数据库中

2.通过mybatis-generator插件生成dao、mapper、model

1）配置mybatis-generator插件生成文件位置
3.修改Customer、Order实体类
1）实现序列化接口
2）建立实体映射关联关系（一对多、多对一）
#一对多：一个客户对应多个订单
private List orders=new ArrayList();

#多对一：多个订单对应一个客户（一个订单对应一个客户）
private Customer customer;
2）修改generatorConfig.xml配置文件的生成目录(mapper和model)及对应生成关系
generatorConfig.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE generatorConfiguration PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
        "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd" >
<generatorConfiguration>
    <!-- 引入配置文件 -->
    <properties resource="jdbc.properties"/>

    <!--指定数据库jdbc驱动jar包的位置-->
    <classPathEntry location="D:\jdk\mvn_repository\mysql\mysql-connector-java\5.1.44\mysql-connector-java-5.1.44.jar"/>

    <!-- 一个数据库一个context -->
    <context id="infoGuardian">
        <!-- 注释 -->
        <commentGenerator>
            <property name="suppressAllComments" value="true"/><!-- 是否取消注释 -->
            <property name="suppressDate" value="true"/> <!-- 是否生成注释代时间戳 -->
        </commentGenerator>

        <!-- jdbc连接 -->
        <jdbcConnection driverClass="${jdbc.driver}"
                        connectionURL="${jdbc.url}" userId="${jdbc.username}" password="${jdbc.password}"/>

        <!-- 类型转换 -->
        <javaTypeResolver>
            <!-- 是否使用bigDecimal， false可自动转化以下类型（Long, Integer, Short, etc.） -->
            <property name="forceBigDecimals" value="false"/>
        </javaTypeResolver>

        <!-- 01 指定javaBean生成的位置 -->
        <!-- targetPackage：指定生成的model生成所在的包名 -->
        <!-- targetProject：指定在该项目下所在的路径  -->
        <javaModelGenerator targetPackage="com.Liuyujian.model"
                            targetProject="src/main/java">
            <!-- 是否允许子包，即targetPackage.schemaName.tableName -->
            <property name="enableSubPackages" value="false"/>
            <!-- 是否对model添加构造函数 -->
            <property name="constructorBased" value="true"/>
            <!-- 是否针对string类型的字段在set的时候进行trim调用 -->
            <property name="trimStrings" value="false"/>
            <!-- 建立的Model对象是否 不可改变  即生成的Model对象不会有 setter方法，只有构造方法 -->
            <property name="immutable" value="false"/>
        </javaModelGenerator>

        <!-- 02 指定sql映射文件生成的位置 -->
        <sqlMapGenerator targetPackage="com.Liuyujian.mapper"
                         targetProject="src/main/java">
            <!-- 是否允许子包，即targetPackage.schemaName.tableName -->
            <property name="enableSubPackages" value="false"/>
        </sqlMapGenerator>

        <!-- 03 生成XxxMapper接口 -->
        <!-- type="ANNOTATEDMAPPER",生成Java Model 和基于注解的Mapper对象 -->
        <!-- type="MIXEDMAPPER",生成基于注解的Java Model 和相应的Mapper对象 -->
        <!-- type="XMLMAPPER",生成SQLMap XML文件和独立的Mapper接口 -->
        <javaClientGenerator targetPackage="com.Liuyujian.mapper"
                             targetProject="src/main/java" type="XMLMAPPER">
            <!-- 是否在当前路径下新加一层schema,false路径com.oop.eksp.user.model， true:com.oop.eksp.user.model.[schemaName] -->
            <property name="enableSubPackages" value="false"/>
        </javaClientGenerator>

        <!-- 配置表信息 -->
        <!-- schema即为数据库名 -->
        <!-- tableName为对应的数据库表 -->
        <!-- domainObjectName是要生成的实体类 -->
        <!-- enable*ByExample是否生成 example类 -->
        <!--<table schema="" tableName="t_book" domainObjectName="Book"-->
        <!--enableCountByExample="false" enableDeleteByExample="false"-->
        <!--enableSelectByExample="false" enableUpdateByExample="false">-->
        <!--&lt;!&ndash; 忽略列，不生成bean 字段 &ndash;&gt;-->
        <!--&lt;!&ndash; <ignoreColumn column="FRED" /> &ndash;&gt;-->
        <!--&lt;!&ndash; 指定列的java数据类型 &ndash;&gt;-->
        <!--&lt;!&ndash; <columnOverride column="LONG_VARCHAR_FIELD" jdbcType="VARCHAR" /> &ndash;&gt;-->
        <!--</table>-->

        <table schema="" tableName="t_hibernate_order" domainObjectName="Order"
               enableCountByExample="false" enableDeleteByExample="false"
               enableSelectByExample="false" enableUpdateByExample="false">
        </table>

        <table schema="" tableName="t_hibernate_order_item" domainObjectName="OrderItem"
               enableCountByExample="false" enableDeleteByExample="false"
               enableSelectByExample="false" enableUpdateByExample="false">
        </table>

        <table schema="" tableName="t_hibernate_book" domainObjectName="Hbook"
               enableCountByExample="false" enableDeleteByExample="false"
               enableSelectByExample="false" enableUpdateByExample="false">
        </table>

        <table schema="" tableName="t_hibernate_book_category" domainObjectName="HbookCategory"
               enableCountByExample="false" enableDeleteByExample="false"
               enableSelectByExample="false" enableUpdateByExample="false">
        </table>

        <table schema="" tableName="t_hibernate_category" domainObjectName="Category"
               enableCountByExample="false" enableDeleteByExample="false"
               enableSelectByExample="false" enableUpdateByExample="false">
        </table>


    </context>
</generatorConfiguration>

**Order **

package com.Liuyujian.model;

public class Order {
    private Integer orderId;

    private String orderNo;

    public Order(Integer orderId, String orderNo) {
        this.orderId = orderId;
        this.orderNo = orderNo;
    }

    public Order() {
        super();
    }

    public Integer getOrderId() {
        return orderId;
    }

    public void setOrderId(Integer orderId) {
        this.orderId = orderId;
    }

    public String getOrderNo() {
        return orderNo;
    }

    public void setOrderNo(String orderNo) {
        this.orderNo = orderNo;
    }

    @Override
    public String toString() {
        return "Order{" +
                "orderId=" + orderId +
                ", orderNo='" + orderNo + '\'' +
                '}';
    }
}

** OrderItem**

package com.Liuyujian.model;

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;
    }

    @Override
    public String toString() {
        return "OrderItem{" +
                "orderItemId=" + orderItemId +
                ", productId=" + productId +
                ", quantity=" + quantity +
                ", oid=" + oid +
                '}';
    }
}

**HbookCategory **

package com.Liuyujian.model;

public class HbookCategory {
    private Integer bcid;

    private Integer bid;

    private Integer cid;

    public HbookCategory(Integer bcid, Integer bid, Integer cid) {
        this.bcid = bcid;
        this.bid = bid;
        this.cid = cid;
    }

    public HbookCategory() {
        super();
    }

    public Integer getBcid() {
        return bcid;
    }

    public void setBcid(Integer bcid) {
        this.bcid = bcid;
    }

    public Integer getBid() {
        return bid;
    }

    public void setBid(Integer bid) {
        this.bid = bid;
    }

    public Integer getCid() {
        return cid;
    }

    public void setCid(Integer cid) {
        this.cid = cid;
    }
}

Hbook

package com.Liuyujian.model;

public class Hbook {
    private Integer bookId;

    private String bookName;

    private Float price;

    public Hbook(Integer bookId, String bookName, Float price) {
        this.bookId = bookId;
        this.bookName = bookName;
        this.price = price;
    }

    public Hbook() {
        super();
    }

    public Integer getBookId() {
        return bookId;
    }

    public void setBookId(Integer bookId) {
        this.bookId = bookId;
    }

    public String getBookName() {
        return bookName;
    }

    public void setBookName(String bookName) {
        this.bookName = bookName;
    }

    public Float getPrice() {
        return price;
    }

    public void setPrice(Float price) {
        this.price = price;
    }

    @Override
    public String toString() {
        return "Hbook{" +
                "bookId=" + bookId +
                ", bookName='" + bookName + '\'' +
                ", price=" + price +
                '}';
    }
}

Category

package com.Liuyujian.model;

public class Category {
    private Integer categoryId;

    private String categoryName;

    public Category(Integer categoryId, String categoryName) {
        this.categoryId = categoryId;
        this.categoryName = categoryName;
    }

    public Category() {
        super();
    }

    public Integer getCategoryId() {
        return categoryId;
    }

    public void setCategoryId(Integer categoryId) {
        this.categoryId = categoryId;
    }

    public String getCategoryName() {
        return categoryName;
    }

    public void setCategoryName(String categoryName) {
        this.categoryName = categoryName;
    }

    @Override
    public String toString() {
        return "Category{" +
                "categoryId=" + categoryId +
                ", categoryName='" + categoryName + '\'' +
                '}';
    }
}

OrderMapper

package com.Liuyujian.mapper;

import com.Liuyujian.model.Order;
import com.Liuyujian.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 **

package com.Liuyujian.mapper;

import com.Liuyujian.model.OrderItem;
import com.Liuyujian.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);
}

HbookMapper

package com.Liuyujian.mapper;

import com.Liuyujian.model.Hbook;
import com.Liuyujian.model.vo.HbookVo;
import org.apache.ibatis.annotations.Param;
import org.springframework.stereotype.Repository;

@Repository
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);
}

HbookCategoryMapper

package com.Liuyujian.mapper;

import com.Liuyujian.model.HbookCategory;

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);
}

CategoryMapper

package com.Liuyujian.mapper;

import com.Liuyujian.model.Category;
import com.Liuyujian.model.vo.CategoryVo;
import org.apache.ibatis.annotations.Param;

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);
}

4.配置mybatis关联映射
4.1 一对多 与 多对多
配置mybatis关联映射所需要的Vo类
OrderVo

package com.Liuyujian.model.vo;

import com.Liuyujian.model.Order;
import com.Liuyujian.model.OrderItem;

import java.util.ArrayList;
import java.util.List;

/**
 * @author老刘飞刀
 * @site www.xiaomage.com
 * @company xxx公司
 * @create  2019-10-23 11:26
 */
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.Liuyujian.model.vo;

import com.Liuyujian.model.Order;
import com.Liuyujian.model.OrderItem;

/**
 * @author老刘飞刀
 * @site www.xiaomage.com
 * @company xxx公司
 * @create  2019-10-23 11:29
 */
public class OrderItemVo extends OrderItem {
    private Order order;

    public Order getOrder() {
        return order;
    }

    public void setOrder(Order order) {
        this.order = order;
    }
}

HbookVo

package com.Liuyujian.model.vo;

import com.Liuyujian.model.Category;
import com.Liuyujian.model.Hbook;

import java.util.ArrayList;
import java.util.List;

/**
 * @author老刘飞刀
 * @site www.xiaomage.com
 * @company xxx公司
 * @create  2019-10-23 18:19
 */
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.Liuyujian.model.vo;

import com.Liuyujian.model.Category;
import com.Liuyujian.model.Hbook;

import java.util.ArrayList;
import java.util.List;

/**
 * @author老刘飞刀
 * @site www.xiaomage.com
 * @company xxx公司
 * @create  2019-10-23 18:21
 */
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;
    }
}

OrderVoMap.xml修改的地方’

  <resultMap id="OrderVoMap" type="com.Liuyujian.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.Liuyujian.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>

OrderVoMap.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.Liuyujian.mapper.OrderMapper" >
  <resultMap id="BaseResultMap" type="com.Liuyujian.model.Order" >
    <constructor >
      <idArg column="order_id" jdbcType="INTEGER" javaType="java.lang.Integer" />
      <arg column="order_no" jdbcType="VARCHAR" javaType="java.lang.String" />
    </constructor>
  </resultMap>
  <resultMap id="OrderVoMap" type="com.Liuyujian.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.Liuyujian.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>
  <sql id="Base_Column_List" >
    order_id, order_no
  </sql>
  <select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Integer" >
    select 
    <include refid="Base_Column_List" />
    from t_hibernate_order
    where order_id = #{orderId,jdbcType=INTEGER}
  </select>
  <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer" >
    delete from t_hibernate_order
    where order_id = #{orderId,jdbcType=INTEGER}
  </delete>
  <insert id="insert" parameterType="com.Liuyujian.model.Order" >
    insert into t_hibernate_order (order_id, order_no)
    values (#{orderId,jdbcType=INTEGER}, #{orderNo,jdbcType=VARCHAR})
  </insert>
  <insert id="insertSelective" parameterType="com.Liuyujian.model.Order" >
    insert into t_hibernate_order
    <trim prefix="(" suffix=")" suffixOverrides="," >
      <if test="orderId != null" >
        order_id,
      </if>
      <if test="orderNo != null" >
        order_no,
      </if>
    </trim>
    <trim prefix="values (" suffix=")" suffixOverrides="," >
      <if test="orderId != null" >
        #{orderId,jdbcType=INTEGER},
      </if>
      <if test="orderNo != null" >
        #{orderNo,jdbcType=VARCHAR},
      </if>
    </trim>
  </insert>
  <update id="updateByPrimaryKeySelective" parameterType="com.Liuyujian.model.Order" >
    update t_hibernate_order
    <set >
      <if test="orderNo != null" >
        order_no = #{orderNo,jdbcType=VARCHAR},
      </if>
    </set>
    where order_id = #{orderId,jdbcType=INTEGER}
  </update>
  <update id="updateByPrimaryKey" parameterType="com.Liuyujian.model.Order" >
    update t_hibernate_order
    set order_no = #{orderNo,jdbcType=VARCHAR}
    where order_id = #{orderId,jdbcType=INTEGER}
  </update>

  <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>

</mapper>

OrderItemMapper.xml修改的地方

 <resultMap id="OrderItemVoMap" type="com.Liuyujian.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.Liuyujian.model.Order">
      <result property="orderId" column="order_id"></result>
      <result property="orderNo" column="order_no"></result>
    </association>
  </resultMap>

OrderItemMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.Liuyujian.mapper.OrderItemMapper" >
  <resultMap id="BaseResultMap" type="com.Liuyujian.model.OrderItem" >
    <constructor >
      <idArg column="order_item_id" jdbcType="INTEGER" javaType="java.lang.Integer" />
      <arg column="product_id" jdbcType="INTEGER" javaType="java.lang.Integer" />
      <arg column="quantity" jdbcType="INTEGER" javaType="java.lang.Integer" />
      <arg column="oid" jdbcType="INTEGER" javaType="java.lang.Integer" />
    </constructor>
  </resultMap>
  <resultMap id="OrderItemVoMap" type="com.Liuyujian.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.Liuyujian.model.Order">
      <result property="orderId" column="order_id"></result>
      <result property="orderNo" column="order_no"></result>
    </association>
  </resultMap>
  <sql id="Base_Column_List" >
    order_item_id, product_id, quantity, oid
  </sql>
  <select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Integer" >
    select 
    <include refid="Base_Column_List" />
    from t_hibernate_order_item
    where order_item_id = #{orderItemId,jdbcType=INTEGER}
  </select>
  <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer" >
    delete from t_hibernate_order_item
    where order_item_id = #{orderItemId,jdbcType=INTEGER}
  </delete>
  <insert id="insert" parameterType="com.Liuyujian.model.OrderItem" >
    insert into t_hibernate_order_item (order_item_id, product_id, quantity, 
      oid)
    values (#{orderItemId,jdbcType=INTEGER}, #{productId,jdbcType=INTEGER}, #{quantity,jdbcType=INTEGER}, 
      #{oid,jdbcType=INTEGER})
  </insert>
  <insert id="insertSelective" parameterType="com.Liuyujian.model.OrderItem" >
    insert into t_hibernate_order_item
    <trim prefix="(" suffix=")" suffixOverrides="," >
      <if test="orderItemId != null" >
        order_item_id,
      </if>
      <if test="productId != null" >
        product_id,
      </if>
      <if test="quantity != null" >
        quantity,
      </if>
      <if test="oid != null" >
        oid,
      </if>
    </trim>
    <trim prefix="values (" suffix=")" suffixOverrides="," >
      <if test="orderItemId != null" >
        #{orderItemId,jdbcType=INTEGER},
      </if>
      <if test="productId != null" >
        #{productId,jdbcType=INTEGER},
      </if>
      <if test="quantity != null" >
        #{quantity,jdbcType=INTEGER},
      </if>
      <if test="oid != null" >
        #{oid,jdbcType=INTEGER},
      </if>
    </trim>
  </insert>
  <update id="updateByPrimaryKeySelective" parameterType="com.Liuyujian.model.OrderItem" >
    update t_hibernate_order_item
    <set >
      <if test="productId != null" >
        product_id = #{productId,jdbcType=INTEGER},
      </if>
      <if test="quantity != null" >
        quantity = #{quantity,jdbcType=INTEGER},
      </if>
      <if test="oid != null" >
        oid = #{oid,jdbcType=INTEGER},
      </if>
    </set>
    where order_item_id = #{orderItemId,jdbcType=INTEGER}
  </update>
  <update id="updateByPrimaryKey" parameterType="com.Liuyujian.model.OrderItem" >
    update t_hibernate_order_item
    set product_id = #{productId,jdbcType=INTEGER},
      quantity = #{quantity,jdbcType=INTEGER},
      oid = #{oid,jdbcType=INTEGER}
    where order_item_id = #{orderItemId,jdbcType=INTEGER}
  </update>
  <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>
</mapper>

HbookMapper.xml修改的地方

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

HbookMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.Liuyujian.mapper.HbookMapper" >
  <resultMap id="BaseResultMap" type="com.Liuyujian.model.Hbook" >
    <constructor >
      <idArg column="book_id" jdbcType="INTEGER" javaType="java.lang.Integer" />
      <arg column="book_name" jdbcType="VARCHAR" javaType="java.lang.String" />
      <arg column="price" jdbcType="REAL" javaType="java.lang.Float" />
    </constructor>
  </resultMap>

  <resultMap id="HbookVoMap" type="com.Liuyujian.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.Liuyujian.model.Category">
      <result property="categoryId" column="category_id"></result>
      <result property="categoryName" column="category_name"></result>
    </collection>
  </resultMap>
  <sql id="Base_Column_List" >
    book_id, book_name, price
  </sql>
  <select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Integer" >
    select 
    <include refid="Base_Column_List" />
    from t_hibernate_book
    where book_id = #{bookId,jdbcType=INTEGER}
  </select>
  <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer" >
    delete from t_hibernate_book
    where book_id = #{bookId,jdbcType=INTEGER}
  </delete>
  <insert id="insert" parameterType="com.Liuyujian.model.Hbook" >
    insert into t_hibernate_book (book_id, book_name, price
      )
    values (#{bookId,jdbcType=INTEGER}, #{bookName,jdbcType=VARCHAR}, #{price,jdbcType=REAL}
      )
  </insert>
  <insert id="insertSelective" parameterType="com.Liuyujian.model.Hbook" >
    insert into t_hibernate_book
    <trim prefix="(" suffix=")" suffixOverrides="," >
      <if test="bookId != null" >
        book_id,
      </if>
      <if test="bookName != null" >
        book_name,
      </if>
      <if test="price != null" >
        price,
      </if>
    </trim>
    <trim prefix="values (" suffix=")" suffixOverrides="," >
      <if test="bookId != null" >
        #{bookId,jdbcType=INTEGER},
      </if>
      <if test="bookName != null" >
        #{bookName,jdbcType=VARCHAR},
      </if>
      <if test="price != null" >
        #{price,jdbcType=REAL},
      </if>
    </trim>
  </insert>
  <update id="updateByPrimaryKeySelective" parameterType="com.Liuyujian.model.Hbook" >
    update t_hibernate_book
    <set >
      <if test="bookName != null" >
        book_name = #{bookName,jdbcType=VARCHAR},
      </if>
      <if test="price != null" >
        price = #{price,jdbcType=REAL},
      </if>
    </set>
    where book_id = #{bookId,jdbcType=INTEGER}
  </update>
  <update id="updateByPrimaryKey" parameterType="com.Liuyujian.model.Hbook" >
    update t_hibernate_book
    set book_name = #{bookName,jdbcType=VARCHAR},
      price = #{price,jdbcType=REAL}
    where book_id = #{bookId,jdbcType=INTEGER}
  </update>

  <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>
</mapper>

CategoryMapper.xml
修改的地方‘

 <resultMap id="CategoryVoMap" type="com.Liuyujian.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.Liuyujian.model.Hbook">
      <result property="bookId" column="book_id"></result>
      <result property="bookName" column="book_name"></result>
      <result property="price" column="price"></result>
    </collection>
  </resultMap>

CategoryMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.Liuyujian.mapper.CategoryMapper" >
  <resultMap id="BaseResultMap" type="com.Liuyujian.model.Category" >
    <constructor >
      <idArg column="category_id" jdbcType="INTEGER" javaType="java.lang.Integer" />
      <arg column="category_name" jdbcType="VARCHAR" javaType="java.lang.String" />
    </constructor>
  </resultMap>

  <resultMap id="CategoryVoMap" type="com.Liuyujian.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.Liuyujian.model.Hbook">
      <result property="bookId" column="book_id"></result>
      <result property="bookName" column="book_name"></result>
      <result property="price" column="price"></result>
    </collection>
  </resultMap>
  <sql id="Base_Column_List" >
    category_id, category_name
  </sql>
  <select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Integer" >
    select 
    <include refid="Base_Column_List" />
    from t_hibernate_category
    where category_id = #{categoryId,jdbcType=INTEGER}
  </select>
  <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer" >
    delete from t_hibernate_category
    where category_id = #{categoryId,jdbcType=INTEGER}
  </delete>
  <insert id="insert" parameterType="com.Liuyujian.model.Category" >
    insert into t_hibernate_category (category_id, category_name)
    values (#{categoryId,jdbcType=INTEGER}, #{categoryName,jdbcType=VARCHAR})
  </insert>
  <insert id="insertSelective" parameterType="com.Liuyujian.model.Category" >
    insert into t_hibernate_category
    <trim prefix="(" suffix=")" suffixOverrides="," >
      <if test="categoryId != null" >
        category_id,
      </if>
      <if test="categoryName != null" >
        category_name,
      </if>
    </trim>
    <trim prefix="values (" suffix=")" suffixOverrides="," >
      <if test="categoryId != null" >
        #{categoryId,jdbcType=INTEGER},
      </if>
      <if test="categoryName != null" >
        #{categoryName,jdbcType=VARCHAR},
      </if>
    </trim>
  </insert>
  <update id="updateByPrimaryKeySelective" parameterType="com.Liuyujian.model.Category" >
    update t_hibernate_category
    <set >
      <if test="categoryName != null" >
        category_name = #{categoryName,jdbcType=VARCHAR},
      </if>
    </set>
    where category_id = #{categoryId,jdbcType=INTEGER}
  </update>
  <update id="updateByPrimaryKey" parameterType="com.Liuyujian.model.Category" >
    update t_hibernate_category
    set category_name = #{categoryName,jdbcType=VARCHAR}
    where category_id = #{categoryId,jdbcType=INTEGER}
  </update>

  <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>
</mapper>

测试一对多
**OnetoManyService **

package com.Liuyujian.service;

import com.Liuyujian.model.vo.OrderItemVo;
import com.Liuyujian.model.vo.OrderVo;
import org.apache.ibatis.annotations.Param;

import java.util.List;

/**
 * @author老刘飞刀
 * @site www.xiaomage.com
 * @company xxx公司
 * @create  2019-10-23 11:44
 */
public interface OnetoManyService {
    List<OrderItemVo> selectByOrderItemId(Integer orderItemId);

    List<OrderVo> selectByOrderId(Integer orderId);
}

实现OnetoManyService
OnetoManyServiceImpl

package com.Liuyujian.service.impl;

import com.Liuyujian.mapper.OrderItemMapper;
import com.Liuyujian.mapper.OrderMapper;
import com.Liuyujian.model.vo.OrderItemVo;
import com.Liuyujian.model.vo.OrderVo;
import com.Liuyujian.service.OnetoManyService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

/**
 * @author老刘飞刀
 * @site www.xiaomage.com
 * @company xxx公司
 * @create  2019-10-23 12:04
 */
@Service
public class OnetoManyServiceImpl implements OnetoManyService {
   @Autowired
   private OrderMapper orderMapper;
   @Autowired
   private OrderItemMapper orderItemMapper;
    @Override
    public List<OrderItemVo> selectByOrderItemId(Integer orderItemId) {
        return orderItemMapper.selectByOrderItemId(orderItemId);
    }

    @Override
    public List<OrderVo> selectByOrderId(Integer orderid) {
        return orderMapper.selectByOrderId(orderid);
    }
}

测试类
**OnetoManyServiceImplTest **

package com.Liuyujian.service.impl;

import com.Liuyujian.SpringBaseTest;
import com.Liuyujian.model.OrderItem;
import com.Liuyujian.model.vo.OrderItemVo;
import com.Liuyujian.model.vo.OrderVo;
import org.junit.Test;
import org.springframework.beans.factory.annotation.Autowired;

import java.util.List;

import static org.junit.Assert.*;

/**
 * @author老刘飞刀
 * @site www.xiaomage.com
 * @company xxx公司
 * @create  2019-10-23 12:06
 */
public class OnetoManyServiceImplTest extends SpringBaseTest {
@Autowired
private  OnetoManyServiceImpl onetoManyService;
    @Test
    public void selectByOrderItemId() {
        List<OrderItemVo> orderItemVos = onetoManyService.selectByOrderItemId(36);
        OrderItemVo orderItemVo = orderItemVos.get(0);
        System.out.println(orderItemVo);
        System.out.println(orderItemVo.getOrder());
    }

    @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);
        }
    }
}

结果
在这里插入图片描述
在这里插入图片描述

测试多对多
** ManyToManyService**

package com.Liuyujian.service;

import com.Liuyujian.model.vo.CategoryVo;
import com.Liuyujian.model.vo.HbookVo;
import org.apache.ibatis.annotations.Param;
import org.springframework.stereotype.Repository;

/**
 * @author老刘飞刀
 * @site www.xiaomage.com
 * @company xxx公司
 * @create  2019-10-23 19:32
 */
@Repository
public interface ManyToManyService {

    CategoryVo selectByCid( Integer cid);

    HbookVo selectByBid( Integer bid);
}

实现 ManyToManyService
ManyToManyServiceImpl

package com.Liuyujian.service.impl;

import com.Liuyujian.mapper.CategoryMapper;
import com.Liuyujian.mapper.HbookMapper;
import com.Liuyujian.model.vo.CategoryVo;
import com.Liuyujian.model.vo.HbookVo;
import com.Liuyujian.service.ManyToManyService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
 * @author老刘飞刀
 * @site www.xiaomage.com
 * @company xxx公司
 * @create  2019-10-23 19:33
 */
@Service
public class ManyToManyServiceImpl implements ManyToManyService {
    @Autowired
    private HbookMapper hbookMapper;
    @Autowired
    private CategoryMapper categoryMapper;

    @Override
    public CategoryVo selectByCid(Integer cid) {
        return categoryMapper.selectByCid(cid);
    }

    @Override
    public HbookVo selectByBid(Integer bid) {

        return hbookMapper.selectByBid(bid);
    }
}

测试类

package com.Liuyujian.service.impl;

import com.Liuyujian.SpringBaseTest;
import com.Liuyujian.model.Category;
import com.Liuyujian.model.Hbook;
import com.Liuyujian.model.vo.CategoryVo;
import com.Liuyujian.model.vo.HbookVo;
import com.Liuyujian.service.ManyToManyService;
import org.junit.Test;
import org.springframework.beans.factory.annotation.Autowired;

import static org.junit.Assert.*;

/**
 * @author老刘飞刀
 * @site www.xiaomage.com
 * @company xxx公司
 * @create  2019-10-23 19:36
 */
public class ManyToManyServiceImplTest extends SpringBaseTest {
  @Autowired
  private ManyToManyService manyToManyService;

    @Test
    public void selectByCid() {
        CategoryVo categoryVo = this.manyToManyService.selectByCid(8);
        System.out.println(categoryVo);
        for (Hbook hbook : categoryVo.getHbooks()) {
            System.out.println(hbook);
        }

    }

    @Test
    public void selectByBid() {
        HbookVo hbookVo = manyToManyService.selectByBid(8);
        System.out.println(hbookVo);
        for (Category category : hbookVo.getCategories()) {
            System.out.println(category);
        }

    }
}

结果
在这里插入图片描述
在这里插入图片描述

邓狗胖
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