1、學習文件

學習文件

2、所需依賴

<dependency>
  <groupId>junit</groupId>
  <artifactId>junit</artifactId>
  <version>4.13</version>
  <scope>test</scope>
</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>3.5.2</version>
</dependency>
​
<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-webmvc</artifactId>
 
  <version>5.1.9.RELEASE</version>
</dependency>
​
<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>1.9.5</version>
</dependency>
​
<dependency>
  <groupId>org.mybatis</groupId>
  <artifactId>mybatis-spring</artifactId>
  <version>2.0.2</version>
</dependency>
​
<dependency>
  <groupId>org.projectlombok</groupId>
  <artifactId>lombok</artifactId>
  <version>1.16.10</version>
</dependency>

3、配置檔案

• spring-dao.xml

  <!--
      DataSource資料來源配置
      sqlSessionFactory
      sqlSession
  -->
  ​
  <?xml version="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
      https://www.springframework.org/schema/beans/spring-beans.xsd">
  ​
    <!--DataSource資料來源配置：使用Spring的資料來源來替換Mybatis的配置-->
    <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/mybatis?useSSL=true&amp;useUnicode=true&amp;characterEncoding=UTF-8"/>
      <property name="username" value="root"/>
      <property name="password" value="root"/>
    </bean>
  ​
    <!--sqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
      <property name="dataSource" ref="dataSource"/>
  ​
      <!--繫結Mybatis配置檔案-->
      <property name="configLocation" value="classpath:mybatis-config.xml"/>
      <property name="mapperLocations" value="classpath:com/hmx/mapper/*.xml"/>
    </bean>
  ​
    <!--sqlSession-->
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
      <constructor-arg index="0" ref="sqlSessionFactory"/>
    </bean>
  ​
  </beans>

• mybatis-config.xml

  <!--
      別名
      設定
  -->
  ​
  <?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核心配置檔案-->
  <configuration>
  ​
    <typeAliases>
      <typeAlias type="com.hmx.pojo.User"/>
    </typeAliases>
  ​
    <settings></settings>
  ​
  </configuration>

4、方式一

• applicationContext.xml

  <!--配置bean以及使用-->
  ​
  <?xml version="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
      https://www.springframework.org/schema/beans/spring-beans.xsd">
  ​
    <import resource="spring.xml"/>
  ​
    <bean id="userMapper" class="com.hmx.mapper.UserMapperImpl">
      <property name="sqlSessionTemplate" ref="sqlSession"></property>
    </bean>
  ​
  </beans>

• 實體類：User

  @Data
  public class User {
  ​
    private int id;
    private String name;
    private String pwd;
  }

• 介面類：UserMapper.java

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

• Mybatis的xml檔案：UserMapper.xml

  <mapper namespace="com.hmx.mapper.UserMapper">
    <select id="selectUser" resultType="user">
       select * from mybatistest
    </select>
  </mapper>

• 介面類的實現類：UserMapperImpl.java

  public class UserMapperImpl implements UserMapper {
  ​
    //和之前不同，我們現在所有操作都使用SqlSessionTemplate來執行
    private SqlSessionTemplate sqlSessionTemplate;
  ​
    public void setSqlSessionTemplate(SqlSessionTemplate sqlSessionTemplate) {
      this.sqlSessionTemplate = sqlSessionTemplate;
     }
  ​
    public List<User> selectUser() {
      UserMapper mapper = sqlSessionTemplate.getMapper(UserMapper.class);
      return mapper.selectUser();
     }
  }

• 測試

  public static void selectTest() {
  
      ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
      UserMapper sqlSession = context.getBean("userMapper", UserMapper.class);
      for (User user : sqlSession.selectUser()) {
          System.out.println(user);
      }
  }

5、方式二

• applicationContext.xml

  <?xml version="1.0" encoding="UTF8"?>
  <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
          https://www.springframework.org/schema/beans/spring-beans.xsd">
  
      <import resource="spring-dao.xml"/>
  
      <bean id="userMapper" class="com.hmx.mapper.UserMapperImpl">
          <property name="sqlSessionFactory" ref="sqlSessionFactory"/>
      </bean>
  
  </beans>

• 介面類的實現類：UserMapperImpl.java

  public class UserMapperImpl extends SqlSessionDaoSupport implements UserMapper {
      public List<User> selectUser() {
          return getSqlSession().getMapper(UserMapper.class).selectUser();
      }
  }