12Spring整合Mybatis

整合mybatis

1具体步骤

1.1导入相关jar包（mybatis-spring整合包【重点】）

	<dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13.2</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.2</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.16</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.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.9.7</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/resources</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>true</filtering>
            </resource>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>true</filtering>
            </resource>
        </resources>
    </build>

1.2编写mybatis-config.xml

其中的enviroment将会被spring的数据源替换，所以不需要写了，下面将其注释掉
在下面的修改版本中，其实可以将mybatis-config.xml中的所有属性配置都放在spring中，完全不需要这一文件，后面会具体实现

<?xml version="1.0" encoding="gbk" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<!--mybatis-config配置文件-->
<configuration>
    
    <typeAliases>
        <package name="com.fao.pojo"/>
    </typeAliases>

<!--    <environments default="development">-->
<!--        <environment id="development">-->
<!--            <transactionManager type="JDBC"/>-->
<!--            <dataSource type="POOLED">-->
<!--                <property name="driver" value="com.mysql.cj.jdbc.Driver"/>-->
<!--                <property name="url" value="jdbc:mysql://localhost:3306/mybatis?useSSL=true&amp;useUnicode=true&amp;characterEncoding=UTF-8&amp;serverTimezone=UTC"/>-->
<!--                <property name="username" value="root"/>-->
<!--                <property name="password" value="root"/>-->
<!--            </dataSource>-->
<!--        </environment>-->
<!--    </environments>-->


    <mappers>
        <mapper class="com.fao.mapper.UserMapper"/>
    </mappers>

</configuration>

1.3编写spring-mybatis.xml

<?xml version="1.0" encoding="gbk"?>
<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">


    <!--    DataSource:使用spring的数据源替换mybatis的配置 (其他还能用c3p0 druid)
            我们这里使用spring提供的jdbc-->
    <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=UTF-8&amp;serverTimezone=UTC"/>
        <property name="username" value="root"/>
        <property name="password" value="root"/>
    </bean>

    <!--sqlSessionFactory,这个我们以前需要在MybatisUtils中生成-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!--绑定上面的dataSource        -->
        <property name="dataSource" ref="dataSource"/>
        <!--绑定Mybatis配置文件       -->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
    </bean>

    <!-- SqlSessionTemplate就是我们在MybatisUtils中使用的sqlSession   -->
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
        <!--只能使用构造器注入sqlSessionFactory        -->
        <constructor-arg name="sqlSessionFactory" ref="sqlSessionFactory"/>
    </bean>

</beans>

1.4在pojo中编写实体类，在mapper中编写UserMapper接口，UserMapper.xml和UserMapperImpl

//User实体类
@Data
public class User {
    private String id;
    private String name;
    private String pwd;
}

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

<?xml version="1.0" encoding="UTF8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<!--核心配置文件-->
<mapper namespace="com.fao.mapper.UserMapper">
    <select id="selectUser" resultType="user">
        select * from user;
    </select>
</mapper>

//UserMapperImpl
public class UserMapperImpl implements UserMapper{

    //我们的所有操作原来都使用sqlSession执行，现在都使用SqlSessionTemplate
    private SqlSessionTemplate sqlSession;

    //加set使得spring注入bean
    public void setSqlSession(SqlSessionTemplate sqlSession) {
        this.sqlSession = sqlSession;
    }

    @Override
    public List<User> selectUser() {
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        return mapper.selectUser();
    }
}

1.5测试

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

1.6改良版之不需要myabits-config.xml

spring-mybatis.xml中增加相关内容

<?xml version="1.0" encoding="gbk"?>
<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">


    <!--    DataSource:使用spring的数据源替换mybatis的配置 (其他还能用c3p0 druid)
            我们这里使用spring提供的jdbc-->
    <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=UTF-8&amp;serverTimezone=UTC"/>
        <property name="username" value="root"/>
        <property name="password" value="root"/>
    </bean>

    <!--sqlSessionFactory,这个我们以前需要在MybatisUtils中生成-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!--绑定上面的dataSource        -->
        <property name="dataSource" ref="dataSource"/>
        <!--以下操作可以替换mybatis-config.xml   -->
        <property name="mapperLocations" value="classpath:com/fao/mapper/*.xml"/>
        <property name="typeAliases" value="com.fao.pojo.User"/>
    </bean>

    <!-- SqlSessionTemplate就是我们在MybatisUtils中使用的sqlSession   -->
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
        <!--只能使用构造器注入sqlSessionFactory        -->
        <constructor-arg name="sqlSessionFactory" ref="sqlSessionFactory"/>
    </bean>

</beans>

1.7改良值使用SqlSessionDaoSuppory

mybatis-spring1.2.3版以上的才有这个
dao继承Support类 , 直接利用 getSqlSession() 获得 , 然后直接注入SqlSessionFactory
比起之前 , 不需要管理SqlSessionTemplate , 而且对事务的支持更加友好 . 可跟踪源码查看

1.7.1修改UserDaoImpl

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

1.7.2修改bean的配置

<bean id="userDao" class="com.kuang.dao.UserDaoImpl">
   <property name="sqlSessionFactory" ref="sqlSessionFactory" />
</bean>

posted @ 2022-05-21 12:52 fao99 阅读(22) 评论(0) 收藏举报

刷新页面返回顶部

fao99

12Spring整合Mybatis

整合mybatis

公告