Spring-整合Mybatis

整合Mybatis

步骤:

  1. 导入相关jar包
    • junit
    • mybatis
    • mysql数据库
    • spring相关的
    • aop织入
    • mybatis-spring【新知识点】
  2. 编写配置文件
  3. 测试

1、回忆MyBatis

  1. 编写实体类
  2. 编写核心配置文件
  3. 编写接口
  4. 编写Mapper.xml
  5. 测试

2、mybatis-spring

1、导入所需的依赖

<dependencies>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.12</version>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>8.0.32</version>
    </dependency>
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.5.11</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>5.3.25</version>
    </dependency>
    <!--Spring操作数据库的话,还需要一个spring-jdbc的包-->
    <!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>5.3.25</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.aspectj/aspectjweaver -->
    <dependency>
        <groupId>org.aspectj</groupId>
        <artifactId>aspectjweaver</artifactId>
        <version>1.9.19</version>
        <scope>runtime</scope>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring -->
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis-spring</artifactId>
        <version>2.0.2</version>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>1.18.26</version>
    </dependency>
</dependencies>

2、MyBatis核心配置文件(配置sqlSessionFactory绑定后可将所有操作写进Spring配置文件,但可以在这里进行一些设置,方便管理)

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "https://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    
</configuration>

3、Spring配置文件(配置方式写在最后)

<?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">

    <bean id="..." class="...">  
        <!-- collaborators and configuration for this bean go here -->
    </bean>

    <bean id="..." class="...">
        <!-- collaborators and configuration for this bean go here -->
    </bean>

    <!-- more bean definitions go here -->

</beans>

4、创建实体类

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

5、创建接口

public interface UserMapper {

    List<User> selectUser();

}

6、创建映射文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "https://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.kuang.mapper.UserMapper">
    <select id="selectUser" resultType="user">
        select * from mybatis.user
    </select>
</mapper>

Mybatis-Spring整合配置:

第一种方式:

  1. 编写数据源配置

    <!--
    DataSource:使用Spring的数据源替换Mybatis的配置 c3p0 dbcp druid
    这里我们使用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/mybatis?useSSL=false&amp;characterEncoding=utf-8&amp;useUnicode=true"/>
        <property name="username" value="root"/>
        <property name="password" value="123456"/>
    </bean>
    
  2. sqlSessionFactory

    <!--sqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <!--绑定mybatis配置文件-->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
        <!--绑定映射文件-->
        <property name="mapperLocations" value="classpath:com/kuang/mapper/UserMapper.xml"/>
    </bean>
    
  3. sqlSessionTemplate

    <!--SqlSessionTemplate:就是我们使用的sqlSession-->
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
        <!--只能使用构造器注入sqlSessionFactory,因为它没有set方法-->
        <constructor-arg index="0" ref="sqlSessionFactory"/>
    </bean>
    
  4. 需要给接口加实现类

    public class UserMapperImpl implements UserMapper{
        // 我们所有的操作,在原来都使用sqlSession来执行,现在都使用SQLSessionTemplate
        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();
        }
    }
    
  5. 将实现类注入

    <bean id="userMapper" class="com.kuang.mapper.UserMapperImpl">
        <property name="sqlSession" ref="sqlSession"/>
    </bean>
    
  6. 测试类

    public class MyTest {
    
        @Test
        public void getUsers() {
            ApplicationContext context = new ClassPathXmlApplicationContext("spring-dao.xml");
            UserMapper userMapper = context.getBean("userMapper", UserMapper.class);
            List<User> users = userMapper.selectUser();
            for (User user : users) {
                System.out.println(user);
            }
        }
    }
    

第二种方式:

  1. 编写数据源配置

    <!--
    DataSource:使用Spring的数据源替换Mybatis的配置 c3p0 dbcp druid
    这里我们使用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/mybatis?useSSL=false&amp;characterEncoding=utf-8&amp;useUnicode=true"/>
        <property name="username" value="root"/>
        <property name="password" value="123456"/>
    </bean>
    
  2. sqlSessionFactory

    <!--sqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <!--绑定mybatis配置文件-->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
        <!--绑定映射文件-->
        <property name="mapperLocations" value="classpath:com/kuang/mapper/UserMapper.xml"/>
    </bean>
    
  3. 给接口加实现类(继承SqlSessionDaoSupport类,可直接用getSqlSession方法获取sqlSession,不再需要配置SqlSessionTemplate)

    public class UserMapperImpl2 extends SqlSessionDaoSupport implements UserMapper{
        @Override
        public List<User> selectUser() {
            return getSqlSession().getMapper(UserMapper.class).selectUser();
        }
    }
    
  4. 将实现类注入

    <bean id="userMapper2" class="com.kuang.mapper.UserMapperImpl2">
        <property name="sqlSessionFactory" ref="sqlSessionFactory"/>
    </bean>
    
  5. 测试类

    @Test
    public void getUsers() {
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        UserMapper userMapper = context.getBean("userMapper2", UserMapper.class);
        List<User> users = userMapper.selectUser();
        for (User user : users) {
            System.out.println(user);
        }
    }
    
posted @ 2023-03-13 05:39  家兴Java  阅读(19)  评论(0编辑  收藏  举报