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整合MyBatis

将 MyBatis 代码无缝地整合到 Spring 中

1、导入相关jar包

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<dependencies>
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.5.7</version>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>8.0.26</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>5.3.9</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>5.3.9</version>
    </dependency>
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis-spring</artifactId>
        <version>2.0.6</version>
    </dependency>

</dependencies>

配置Maven静态资源过滤问题！

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<build>
   <resources>
       <resource>
           <directory>src/main/java</directory>
           <includes>
               <include>**/*.properties</include>
               <include>**/*.xml</include>
           </includes>
           <filtering>true</filtering>
       </resource>
   </resources>
</build>

2、创建mybatis配置文件 mybatis-config.xml

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<?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>
</configuration>

3、编写pojo实体类

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public class User {
    private int id;
    private String name;
    private String pwd;
    // constructor-method/getter&&setter-method/tostring-method
}

4、UserDao接口编写

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

5、接口对应的Mapper映射文件

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<?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.chenpeng.mapper.UserMapper">
   <select id="selectUser" resultType="com.chenpeng.pojo.User">
    select * from user;
   </select>
</mapper>

方式一

  1. 引入Spring配置文件beans.xml
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<?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
       http://www.springframework.org/schema/beans/spring-beans.xsd">
</bean>
  1. 配置数据源替换mybaits的数据源
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<!--配置数据源：数据源有非常多，可以使用第三方的，也可使使用Spring的-->
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
   <property name="driverClassName" value="com.mysql.cj.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="chenpeng"/>
</bean>
  1. 配置SqlSessionFactory，关联MyBatis
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<!--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:com/chenpeng/mapper/*.xml"/>
</bean>
  1. 注册sqlSessionTemplate，关联sqlSessionFactory；
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<!--注册sqlSessionTemplate , 关联sqlSessionFactory-->
<bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
   <!--利用构造器注入-->
   <constructor-arg index="0" ref="sqlSessionFactory"/>
</bean>
  1. 增加Dao接口的实现类；私有化sqlSessionTemplate
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public class UserDaoImpl implements UserMapper{

    private SqlSessionTemplate sqlSession;

    public void setSqlSession(SqlSessionTemplate sqlSession) {
        this.sqlSession = sqlSession;
    }

    @Override
    public List<User> selectUser() {
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        return mapper.selectUser();
    }
}
  1. 注册bean实现
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<bean id="userDao" class="com.chenpeng.mapper.UserDaoImpl">
   <property name="sqlSession" ref="sqlSession"/>
</bean>
  1. 测试
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public class MyTest {
    @Test
    public void test01() {
        ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
        UserMapper mapper = context.getBean("userDao", UserMapper.class);
        List<User> users = mapper.selectUser();
        System.out.println(users);
    }
}