Spring整合第三方框架-MyBatis整合Spring实现

Spring整合MyBatis的步骤

• 导入MyBatis整合Spring相关坐标。

  •  
            <dependency>
                <groupId>org.mybatisgroupId>
                <artifactId>mybatis-springartifactId>
                <version>2.0.5version>
            dependency>
            <dependency>
                <groupId>org.springframeworkgroupId>
                <artifactId>spring-jdbcartifactId>
                <version>5.3.13version>
            dependency>
     
     
    

• 编写Mapper接口和Mapper.xml
• 在配置文件中配置SqlSessionFactoryBean和MapperScannerConfigurer
  • SqlSessionFactoryBean：向Spring容器中提供SqlSessionFactory
  • MapperScannerConfigurer：将Mapper接口类对象存储到Spring容器中（交给容器管理后就可以在需要的地方直接注入Mapper接口类对象即可）

    • "1.0" encoding="UTF-8"?>
      <beans xmlns="http://www.springframework.org/schema/beans"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
          
          <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
              <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
              <property name="url" value="jdbc:mysql://localhost:3306/db02"/>
              <property name="username" value="root"/>
              <property name="password" value="123456"/>
          bean>
       
          <bean class="org.mybatis.spring.SqlSessionFactoryBean">
              <property name="dataSource" ref="dataSource"/>
          bean>
       
          
          <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
              <property name="basePackage" value="com.example.Mapper"/>
          bean>
       
          <bean id="userService" class="com.example.Service.Impl.UserServiceImpl">
              <property name="empMapper" ref="empMapper">property>
              <property name="userDAO" ref="userDAO"/>
              <property name="name" value="hhhh"/>
          bean>
       
          <bean name="userDAO" class="com.example.DAO.Impl.UserDAOImpl"/>
      beans>
      

  • 上述两个文件配置完成之后就替代了MyBatis原始代码中配置MyBatis参数的配置文件
    • 原始代码的配置文件

    • "1.0" encoding="UTF-8" ?>
      configuration
              PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
              "https://mybatis.org/dtd/mybatis-3-config.dtd">
      <configuration>
          <environments default="development">
              <environment id="development">
                  <transactionManager type="JDBC"/>
                  <dataSource type="POOLED">
                      <property name="driver" value="com.mysql.jdbc.Driver"/>
                      <property name="url" value="jdbc:mysql://localhost:3306/db02"/>
                      <property name="username" value="root"/>
                      <property name="password" value="123456"/>
                  dataSource>
              environment>
          environments>
          
          <mappers>
              <package name="com.example.Mapper"/>
          mappers>
      configuration>
      

• 编写测试代码

  • package com.example.Test;
     
     
    import com.example.Service.UserService;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
     
    public class TestApplicationContext {
        public static void main(String[] args) {
            ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("application.xml");
            UserService UserServiceBean = (UserService) context.getBean(UserService.class);
            UserServiceBean.show();
        }
    }
     
    

    
     

  • 接口实现类UserServiceImpl

    • package com.example.Service.Impl;
       
      import com.example.DAO.UserDAO;
      import com.example.Mapper.EmpMapper;
      import com.example.Service.UserService;
      import com.example.pojo.Emp;
       
      import java.util.List;
       
       
      public class UserServiceImpl implements UserService {
          public EmpMapper empMapper;
       
          public UserServiceImpl() {
              System.out.println("UserService对象创建");
          }
       
          private UserDAO userDAO;
          private String name;
       
       
          public void setName(String name) {
              this.name = name;
          }
       
          public void setUserDAO(UserDAO userDAO) {
              System.out.println("UserService执行注入UserDAO的操作:setDAO方法");
              this.userDAO = userDAO;
          }
       
          @Override
          public void show() {
              List all = empMapper.findAll();
              for (Emp emp : all) {
                  System.out.println(emp);
              }
          }
       
          public void setEmpMapper(EmpMapper empMapper) {
              this.empMapper = empMapper;
          }
      }
      

    • 上述接口实现类的代码中，将Mapper接口类的对象直接进行注入（与配置文件中的配置相对应）

    • 运行测试代码结果如下

      •