mybatis关联关系映射
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2024-03-04 09:28:41
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1、一对多关联关系
pom依赖完整版（建议一个一个导入）
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.cbw</groupId>
<artifactId>ssm</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>
<name>ssm Maven Webapp</name>
<!-- FIXME change it to the project's website -->
<url>http://www.example.com</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<maven.compiler.plugin.version>3.7.0</maven.compiler.plugin.version>
<!--添加jar包依赖-->
<!--1.spring 5.0.2.RELEASE相关-->
<spring.version>5.0.2.RELEASE</spring.version>
<!--2.mybatis相关-->
<mybatis.version>3.4.5</mybatis.version>
<!--mysql-->
<mysql.version>5.1.44</mysql.version>
<!--pagehelper分页jar依赖-->
<pagehelper.version>5.1.2</pagehelper.version>
<!--mybatis与spring集成jar依赖-->
<mybatis.spring.version>1.3.1</mybatis.spring.version>
<!--3.dbcp2连接池相关 druid-->
<commons.dbcp2.version>2.1.1</commons.dbcp2.version>
<commons.pool2.version>2.4.3</commons.pool2.version>
<!-- log4j2日志配置相关依赖 -->
<log4j2.version>2.9.1</log4j2.version>
<log4j2.disruptor.version>3.2.0</log4j2.disruptor.version>
<slf4j.version>1.7.13</slf4j.version>
<!--5.其他-->
<junit.version>4.12</junit.version>
<servlet.version>4.0.0</servlet.version>
<lombok.version>1.18.2</lombok.version>
<!-- redis与spring的整合依赖 -->
<redis.version>2.9.0</redis.version>
<redis.spring.version>1.7.1.RELEASE</redis.spring.version>
<!-- jackson -->
<jackson.version>2.9.3</jackson.version>
<!-- 5.3、jstl、standard -->
<jstl.version>1.2</jstl.version>
<standard.version>1.1.2</standard.version>
<!-- 5.4、tomcat-jsp-api -->
<tomcat-jsp-api.version>8.0.47</tomcat-jsp-api.version>
</properties>
<dependencies>
<!--1.spring相关-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${spring.version}</version>
</dependency>
<!--2.mybatis相关-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>${mybatis.version}</version>
</dependency>
<!--mysql-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>${mysql.version}</version>
</dependency>
<!--pagehelper分页插件jar包依赖-->
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper</artifactId>
<version>${pagehelper.version}</version>
</dependency>
<!--mybatis与spring集成jar包依赖-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>${mybatis.spring.version}</version>
</dependency>
<!--3.dbcp2连接池相关-->
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-dbcp2</artifactId>
<version>${commons.dbcp2.version}</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-pool2</artifactId>
<version>${commons.pool2.version}</version>
</dependency>
<!-- log4j2日志相关依赖 -->
<!-- log配置：Log4j2 + Slf4j -->
<!-- slf4j核心包-->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${slf4j.version}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>jcl-over-slf4j</artifactId>
<version>${slf4j.version}</version>
<scope>runtime</scope>
</dependency>
<!--核心log4j2jar包-->
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api</artifactId>
<version>${log4j2.version}</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>${log4j2.version}</version>
</dependency>
<!--用于与slf4j保持桥接-->
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-slf4j-impl</artifactId>
<version>${log4j2.version}</version>
</dependency>
<!--web工程需要包含log4j-web，非web工程不需要-->
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-web</artifactId>
<version>${log4j2.version}</version>
<scope>runtime</scope>
</dependency>
<!--需要使用log4j2的AsyncLogger需要包含disruptor-->
<dependency>
<groupId>com.lmax</groupId>
<artifactId>disruptor</artifactId>
<version>${log4j2.disruptor.version}</version>
</dependency>
<!--5.其他-->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>${junit.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>${servlet.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>${lombok.version}</version>
<scope>provided</scope>
</dependency>
<!-- ssm中整合ehcache -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>${spring.version}</version>
</dependency>
<!--mybatis与ehcache整合-->
<dependency>
<groupId>org.mybatis.caches</groupId>
<artifactId>mybatis-ehcache</artifactId>
<version>1.1.0</version>
</dependency>
<!--ehcache依赖-->
<dependency>
<groupId>net.sf.ehcache</groupId>
<artifactId>ehcache</artifactId>
<version>2.10.0</version>
</dependency>
<!-- redis与spring的整合依赖 -->
<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
<version>${redis.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-redis</artifactId>
<version>${redis.spring.version}</version>
</dependency>
<!-- jackson -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>${jackson.version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>${jackson.version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>${jackson.version}</version>
</dependency>
<dependency>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
</dependency>
<!-- 5.3、jstl、standard -->
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>${jstl.version}</version>
</dependency>
<dependency>
<groupId>taglibs</groupId>
<artifactId>standard</artifactId>
<version>${standard.version}</version>
</dependency>
<!-- 5.4、tomcat-jsp-api -->
<dependency>
<groupId>org.apache.tomcat</groupId>
<artifactId>tomcat-jsp-api</artifactId>
<version>${tomcat-jsp-api.version}</version>
</dependency>
</dependencies>
<build>
<finalName>ssm</finalName>
<resources>
<!--解决mybatis-generator-maven-plugin运行时没有将XxxMapper.xml文件放入target文件夹的问题-->
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.xml</include>
</includes>
</resource>
<!--解决mybatis-generator-maven-plugin运行时没有将jdbc.properites文件放入target文件夹的问题-->
<resource>
<directory>src/main/resources</directory>
<includes>
<include>*.properties</include>
<include>*.xml</include>
</includes>
</resource>
</resources>
<pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${maven.compiler.plugin.version}</version>
<configuration>
<source>${maven.compiler.source}</source>
<target>${maven.compiler.target}</target>
<encoding>${project.build.sourceEncoding}</encoding>
</configuration>
</plugin>
<plugin>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-maven-plugin</artifactId>
<version>1.3.2</version>
<dependencies>
<!--使用Mybatis-generator插件不能使用太高版本的mysql驱动 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>${mysql.version}</version>
</dependency>
</dependencies>
<configuration>
<overwrite>true</overwrite>
</configuration>
</plugin>
<plugin>
<artifactId>maven-clean-plugin</artifactId>
<version>3.1.0</version>
</plugin>
<!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
<plugin>
<artifactId>maven-resources-plugin</artifactId>
<version>3.0.2</version>
</plugin>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.0</version>
</plugin>
<plugin>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.22.1</version>
</plugin>
<plugin>
<artifactId>maven-war-plugin</artifactId>
<version>3.2.2</version>
</plugin>
<plugin>
<artifactId>maven-install-plugin</artifactId>
<version>2.5.2</version>
</plugin>
<plugin>
<artifactId>maven-deploy-plugin</artifactId>
<version>2.8.2</version>
</plugin>
</plugins>
</pluginManagement>
</build>
</project>
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
实体类 vo.类
package com.cbw.ssm.model.vo;
import com.cbw.ssm.model.Order;
import com.cbw.ssm.model.OrderItem;
import java.util.List;
/**
* @author 陈公子
* @site www.cbw.com
* @company xxx公司
* @create 2019-11-21 22:54
*/
public class OrderVo extends Order {
private List<OrderItem> orderItems;
public List<OrderItem> getOrderItems() {
return orderItems;
}
public void setOrderItems(List<OrderItem> orderItems) {
this.orderItems = orderItems;
}
}
package com.cbw.ssm.model.vo;
import com.cbw.ssm.model.Order;
import com.cbw.ssm.model.OrderItem;
/**
@author 陈公子
@site www.cbowen.com
@company cbw公司
* @create 2019-11-21 22:55
*/
public class OrderItemVo extends OrderItem {
private Order order;
public Order getOrder() {
return order;
}
public void setOrder(Order order) {
this.order = order;
}
}
OrderMapper.xml
<resultMap id="OrderVoMap" type="com.cbw.ssm.model.vo.OrderVo" >
<result property="orderId" column="order_id"></result>
<result property="orderNo" column="order_no"></result>
<collection property="orderItems" ofType="com.cbw.ssm.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>
<select id="queryOrderVoByOrderId" resultMap="OrderVoMap" parameterType="java.lang.Integer">
select * from t_hibernate_order o,t_hibernate_order_item oi
where o.order_id = oi.oid
and o.order_id = #{orderId}
</select>
OrderMapper.java
package com.cbw.ssm.mapper;
import com.cbw.ssm.model.Order;
import com.cbw.ssm.model.vo.OrderVo;
import org.apache.ibatis.annotations.Param;
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);
OrderVo queryOrderVoByOrderId(@Param("orderId") Integer orderId);
}
OrderItemMapper.xml
<resultMap id="OrderItemVoMap" type="com.cbw.ssm.model.vo.OrderItemVo">
<result property="orderItemId" column="order_item_id"></result>
<result property="productId" column="product_id"></result>
<result property="quantity" column="quantity"></result>
<result property="oid" column="oid"></result>
<association property="order" javaType="com.cbw.ssm.model.Order">
<result property="orderId" column="order_id"></result>
<result property="orderNo" column="order_no"></result>
</association>
</resultMap>
<select id="queryOrderItemVoByOrderItemId" 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>
OrderItemMapper.java
package com.cbw.ssm.mapper;
import com.cbw.ssm.model.OrderItem;
import com.cbw.ssm.model.vo.OrderItemVo;
import org.apache.ibatis.annotations.Param;
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);
OrderItemVo queryOrderItemVoByOrderItemId(@Param("orderItemId") Integer orderItemId);
}
One2ManyService.java
package com.cbw.ssm.service;
import com.cbw.ssm.model.vo.OrderItemVo;
import com.cbw.ssm.model.vo.OrderVo;
import org.springframework.stereotype.Service;
/**
@author 陈公子
@site www.cbowen.com
@company cbw公司
* @create 2019-11-21 23:14
*/
@Service
public interface One2ManyService {
OrderVo queryOrderVoByOrderId(Integer orderId);
OrderItemVo queryOrderItemVoByOrderItemId(Integer orderItemId);
}
One2ManyServiceImpl
package com.cbw.ssm.service.impl;
import com.cbw.ssm.mapper.OrderItemMapper;
import com.cbw.ssm.mapper.OrderMapper;
import com.cbw.ssm.model.vo.OrderItemVo;
import com.cbw.ssm.model.vo.OrderVo;
import com.cbw.ssm.service.One2ManyService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
/**
* @author cbw
* @site www.cbw.com
* @company xxx公司
* @create 2019-11-21 23:25
*/
@Service
public class One2ManyServiceImpl implements One2ManyService {
@Autowired
private OrderMapper orderMapper;
@Autowired
private OrderItemMapper orderItemMapper;
@Override
public OrderVo queryOrderVoByOrderId(Integer orderId) {
return orderMapper.queryOrderVoByOrderId(orderId);
}
@Override
public OrderItemVo queryOrderItemVoByOrderItemId(Integer orderItemId) {
return orderItemMapper.queryOrderItemVoByOrderItemId(orderItemId);
}
}
测试类：One2ManyServiceImplTest
package com.cbw.ssm.service.impl;
import com.cbw.ssm.SpringBaseTest;
import com.cbw.ssm.model.OrderItem;
import com.cbw.ssm.model.vo.OrderItemVo;
import com.cbw.ssm.model.vo.OrderVo;
import com.cbw.ssm.service.One2ManyService;
import org.junit.Test;
import org.springframework.beans.factory.annotation.Autowired;
import static org.junit.Assert.*;
/**
* @author cbw
* @site www.cbw.com
* @company xxx公司
* @create 2019-11-21 23:28
*/
public class One2ManyServiceImplTest extends SpringBaseTest {
@Autowired
private One2ManyService one2ManyService;
@Test
public void queryOrderVoByOrderId() {
OrderVo orderVo = one2ManyService.queryOrderVoByOrderId(8);
System.out.println(orderVo.getOrderNo());
for (OrderItem orderItem : orderVo.getOrderItems()) {
System.out.println(orderItem);
}
}
@Test
public void queryOrderItemVoByOrderItemId() {
OrderItemVo orderItemVo = one2ManyService.queryOrderItemVoByOrderItemId(35);
System.out.println(orderItemVo);
System.out.println(orderItemVo.getOrder().getOrderNo());
}
}
效果：
一对多：
多对一
2、多对多关联关系
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
实体类
package com.cbw.ssm.model;
import lombok.ToString;
@ToString
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;
}
}
package com.cbw.ssm.model.vo;
import com.cbw.ssm.model.Category;
import com.cbw.ssm.model.Hbook;
import java.util.List;
/**
@author 陈公子
@site www.cbowen.com
@company cbw公司
* @create 2019-11-22 0:04
*/
public class CategoryVo extends Category {
private List<Hbook> hbooks;
public List<Hbook> getHbooks() {
return hbooks;
}
public void setHbooks(List<Hbook> hbooks) {
this.hbooks = hbooks;
}
}
HbookCategoryMapper.xml
<resultMap id="HbookVoMap" type="com.cbw.ssm.model.vo.HbookVo" >
<result property="bookId" column="book_id"></result>
<result property="bookName" column="book_name"></result>
<result property="price" column="price"></result>
<collection property="categories" ofType="com.cbw.ssm.model.Category">
<result property="categoryId" column="category_id"></result>
<result property="categoryName" column="category_name"></result>
</collection>
</resultMap>
<resultMap id="CategoryVoMap" type="com.cbw.ssm.model.vo.CategoryVo" >
<result property="categoryId" column="category_id"></result>
<result property="categoryName" column="category_name"></result>
<collection property="hbooks" ofType="com.cbw.ssm.model.Hbook">
<result property="bookId" column="book_id"></result>
<result property="bookName" column="book_name"></result>
<result property="price" column="price"></result>
</collection>
</resultMap>
HbookCategoryMapper.java
package com.cbw.ssm.mapper;
import com.cbw.ssm.model.HbookCategory;
import com.cbw.ssm.model.vo.CategoryVo;
import com.cbw.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);
}
Many2ManyService.java
package com.cbw.ssm.service;
import com.cbw.ssm.model.vo.CategoryVo;
import com.cbw.ssm.model.vo.HbookVo;
/**
@author 陈公子
@site www.cbowen.com
@company cbw公司
* @create 2019-11-22 0:22
*/
public interface Many2ManyService {
HbookVo queryByBookId(Integer bookId);
CategoryVo queryByCid(Integer cid);
}
.impl;
package com.cbw.ssm.service;
import com.cbw.ssm.mapper.HbookCategoryMapper;
import com.cbw.ssm.model.vo.CategoryVo;
import com.cbw.ssm.model.vo.HbookVo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
/**
@author 陈公子
@site www.cbowen.com
@company cbw公司
* @create 2019-11-22 0:23
*/
@Service
public class Many2ManyServiceImpl implements Many2ManyService {
@Autowired
private HbookCategoryMapper hbookCategoryMapper;
@Override
public HbookVo queryByBookId(Integer bookId) {
return hbookCategoryMapper.queryByBookId(bookId);
}
@Override
public CategoryVo queryByCid(Integer cid) {
return hbookCategoryMapper.queryByCid(cid);
}
}
测试类
Many2ManyServiceImplTest.java
package com.cbw.ssm.service;
import com.cbw.ssm.service.Many2ManyService;
import com.cbw.ssm.SpringBaseTest;
import com.cbw.ssm.model.Category;
import com.cbw.ssm.model.Hbook;
import com.cbw.ssm.model.vo.CategoryVo;
import com.cbw.ssm.model.vo.HbookVo;
import org.junit.Test;
import org.springframework.beans.factory.annotation.Autowired;
import static org.junit.Assert.*;
/**
* @author cbw
* @site www.cbw.com
* @company xxx公司
* @create 2019-11-22 0:25
*/
public class Many2ManyServiceImplTest extends SpringBaseTest {
@Autowired
private Many2ManyService many2ManyService;
@Test
public void queryByBookId() {
HbookVo hbookVo =many2ManyService.queryByBookId(8);
System.out.println(hbookVo.getCategories());
for (Category category : hbookVo.getCategories()) {
System.out.println(category);：
}
}
@Test
public void queryByCid() {
CategoryVo categoryVo = many2ManyService.queryByCid(8);
System.out.println(categoryVo.getCategoryName());
for (Hbook hbook : categoryVo.getHbooks()) {
System.out.println(hbook.getBookName());
}
}
}
效果：
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