Spring5 入门——Mybatis-Spring

[SM] 整合

简简单单的整合，简简单单的快乐

步骤

1. 导入相关jar包

• junit

• mybatis

• mysql数据库

• spring相关的

• aop织入

• mybatis-spring [new]

  
    <dependencies>
  
      <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.12</version>
      </dependency>
      <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.47</version>
      </dependency>
      <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.5.6</version>
      </dependency>
      <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>5.1.9.RELEASE</version>
      </dependency>
  <!--    Spring操作数酷 还学邀一个spring-jdbc-->
      <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>5.1.9.RELEASE</version>
      </dependency>
      <dependency>
        <groupId>org.aspectj</groupId>
        <artifactId>aspectjweaver</artifactId>
        <version>1.9.6</version>
      </dependency>
  
      <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis-spring</artifactId>
        <version>2.0.6</version>
      </dependency>
  
      <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>1.18.20</version>
      </dependency>
  
    </dependencies>
    <build>
      <resources>
        <resource>
          <directory>src/main/java</directory>
          <includes>
            <include>**/*.properties</include>
            <include>**/*.xml</include>
          </includes>
          <filtering>true</filtering>
        </resource>
      </resources>
    </build>
  

2. 编写配置文件

3. 测试

Mybatis

1. 编写实体类

   package com.kuang.pojo;
   
   public class User {
      private int id;  //id
      private String name;   //姓名
      private String pwd;   //密码
   }
   

2. 编写核心配置文件

   <?xml version="1.0" encoding="UTF-8" ?>
   <!DOCTYPE configuration
          PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
          "http://mybatis.org/dtd/mybatis-3-config.dtd">
   <configuration>
   
      <typeAliases>
          <package name="com.kuang.pojo"/>
      </typeAliases>
   
      <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/mybatis?useSSL=true&amp;useUnicode=true&amp;characterEncoding=utf8"/>
                  <property name="username" value="root"/>
                  <property name="password" value="123456"/>
              </dataSource>
          </environment>
      </environments>
   
      <mappers>
          <package name="com.kuang.dao"/>
      </mappers>
   </configuration>
   

3. 编写接口

   public interface UserMapper {
      public List<User> selectUser();
   }
   

4. 编写Mapper.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.kuang.dao.UserMapper">
   
      <select id="selectUser" resultType="User">
       select * from user
      </select>
   
   </mapper>
   

5. 测试

   @Test
   public void selectUser() throws IOException {
   
      String resource = "mybatis-config.xml";
      InputStream inputStream = Resources.getResourceAsStream(resource);
      SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
      SqlSession sqlSession = sqlSessionFactory.openSession();
   
      UserMapper mapper = sqlSession.getMapper(UserMapper.class);
   
      List<User> userList = mapper.selectUser();
      for (User user: userList){
          System.out.println(user);
     }
   
      sqlSession.close();
   }
   

每次测试类都要去newSqlSessionFactory 纯度太低了 我选择把这些new对象的事情全权交给Spring

Spring+Mybatis(方式一)

1. 编写数据源配置

   之前的Mybatis核心文件可以留着

   创建spring-dao.xml

   配置数据源

   <!--    DataSource 这里使用Spring提供的JDBC-->
       <bean id="datasource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
           <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
           <property name="url" value="jdbc:mysql://localhost:3306/ssm?useUnicode=true&amp;useSSL=false&amp;characterEncoding=utf8&amp;serverTimezone=UTC"/>
           <property name="username" value="root"/>
           <property name="password" value="123456"/>
       </bean>
   

2. sqlSessionFactory

    <!--配置SqlSessionFactory-->
       <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
           <property name="dataSource" ref="datasource"/>
           <!--关联Mybatis-->
           <property name="configLocation" value="classpath:mybatis-config.xml"/>
           <property name="mapperLocations" value="classpath:/mapper/UserMapper.xml"/>
       </bean>
   

3. sqlSessionTemplate

      <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
   <!--        只能只用构造器注入-->
           <constructor-arg index="0" ref="sqlSessionFactory"/>
       </bean>
   
   

4. 需要给接口加实现类【注入Spring用】

   package com.joker.mapper;
   
   import com.joker.pojo.User;
   import org.mybatis.spring.support.SqlSessionDaoSupport;
   
   import java.util.List;
   
   public class UserMapperImpl2 extends SqlSessionDaoSupport implements UserMapper {
       @Override
       public List<User> selectUser() {
           return getSqlSession().getMapper(UserMapper.class).selectUser();
       }
   
       @Override
       public void AddUser(User user) {
           getSqlSession().getMapper(UserMapper.class).AddUser(user);
       }
   
       @Override
       public void deleteUser(String uname) {
           getSqlSession().getMapper(UserMapper.class).deleteUser(uname);
       }
   
       @Override
       public void update(int id, String name, String password) {
           getSqlSession().getMapper(UserMapper.class).update(id,name,password);
       }
   }
   

5. 将自己写的实现类，注入到Spring中

   创建一个applicationContext.xml

    <import resource="spring-dao.xml"/>
    //引用spring-dao.xml的东西xml
    
       <bean id="userMapper2" class="com.joker.mapper.UserMapperImpl2">
           <property name="sqlSessionFactory" ref="sqlSessionFactory"/>
       </bean>
      //注入到Spring
   

6. 测试使用即可

  @Test
    public void selsctUser(){
        ApplicationContext context =
                new ClassPathXmlApplicationContext("applicationContext.xml");

      UserMapper userMapper = context.getBean("userMapper2", UserMapper.class);
        for (User user : userMapper.selectUser()) {
            System.out.println(user);
        }
    }