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Spring学习（八）——整合Mybatis

飞熊 • • 后端开发 • 阅读 59

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整合Mybatis

整合步骤

1、导入相关jar包

  • junit
  • mybatis
  • mysql数据库
  • spring包
  • aop植入
  • mybatis-spring
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>Spring-Study</artifactId>
        <groupId>org.example</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>spring-10-mybatis</artifactId>

    <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>3.5.3</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.3</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>5.2.8.RELEASE</version>
        </dependency>

       <!-- spring连接数据库使用spring-jdbc-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.2.8.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.9.6</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.12</version>
        </dependency>
    </dependencies>

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

            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.xml</include>
                    <include>**/*.properties</include>
                </includes>
            </resource>
        </resources>
    </build>
</project>

Mybatis和Spring直接整合

编写实体类

package com.my.pojo;


import lombok.Data;

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

}

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">
<!--核心配置文件-->
<configuration>
    <typeAliases>
        <package name="com.my.pojo"/>
        
    </typeAliases>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/><!--事务管理-->
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/mybatis?userSSL=false&amp;userUnicode=true&amp;characterEncoding=utf-8"/>
                <property name="username" value="root"/>
                <property name="password" value="123456"/>
            </dataSource>
        </environment>
    </environments>

    <!--每一个Mapper.xml都要在mybatis核心配置文件中注册-->
    <mappers>
        <mapper class="com.my.mapper.UserMapper"/>
    </mappers>

</configuration>

编写接口

package com.my.mapper;

import com.my.pojo.User;

import java.util.List;

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

编写Mapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!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.my.mapper.UserMapper">
    <select id="selectUser" resultType="user">
        select * from mybatis.user;
    </select>


</mapper>

测试

import com.my.mapper.UserMapper;
import com.my.pojo.User;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Test;

import java.io.IOException;
import java.io.InputStream;
import java.util.List;


public class MyTest {
    @Test
    public void Test() throws IOException {
        String resources = "mybatis-config.xml";
        InputStream inputStream = Resources.getResourceAsStream(resources);
        
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        SqlSession sqlSession = sqlSessionFactory.openSession(true);

        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        List<User> userList = mapper.selectUser();

        for (User user : userList) {
            System.out.println(user);
        }



    }
}

利用Mybatis-spring配置整合

方式一：使用SqlSessionTemplate

在这里插入图片描述

package com.my.mapper;

import com.my.pojo.User;

import java.util.List;

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


<?xml version="1.0" encoding="UTF-8" ?>
<!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.my.mapper.UserMapper">
    <select id="selectUser" resultType="user">
        select * from mybatis.user;
    </select>


</mapper>

<?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">
<!--核心配置文件-->
<configuration>
    <typeAliases>
        <package name="com.my.pojo"/>
    </typeAliases>

</configuration>

将mybatis的配置文件整合到spring中简化配置
在这里插入图片描述
说到底就是把mybatis中的配置注入到Spring的配置容器中
在这里插入图片描述

将实现类注入到Spring中测试使用

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd">

<!--DataSource使用Spring的数据源替换mybatis的配置
使用Spring'提供的jdbc:org.springframework.jdbc.datasource.DriverManagerDataSource-->
    <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?userSSL=false&amp;userUnicode=true&amp;characterEncoding=utf-8"/>
        <property name="username" value="root"/>
        <property name="password" value="123456"/>
    </bean>

<!--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"/>
        <property name="mapperLocations" value="classpath:com/my/mapper/*.xml"/>
    </bean>

    <!--创建sqlSession-->
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
        <!--因为没有set方法，所以只能通过构造器注入sqlSessionFactory-->
        <constructor-arg index="0" ref="sqlSessionFactory"/>
    </bean>

    <!--使用sqlSession调用接口-->
    <bean id="userMapper" class="com.my.mapper.UserMapperImpl">
        <property name="sqlSession" ref="sqlSession"/>
    </bean>

</beans>

在这里插入图片描述
在这里插入图片描述
总流程：
1、编写数据源
在这里插入图片描述
2、在spring’中配置sqlSessionFactory
在这里插入图片描述
3、创建一个实体类连接接口，并将实体类注入到Spring中
在这里插入图片描述
在这里插入图片描述

package com.my.mapper;

import com.my.pojo.User;
import org.mybatis.spring.SqlSessionTemplate;

import java.util.List;

public class UserMapperImpl implements UserMapper {

    //原来所有的操作使用sqlSession执行，现在都使用SqlSessionTemplate
    private SqlSessionTemplate sqlSession ;

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

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


}

4、测试将实现类注入到Spring中，然后spring中再一层一层往回调

import com.my.mapper.UserMapper;
import com.my.pojo.User;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.io.IOException;


public class MyTest {
    @Test
    public void Test() throws IOException {
        ApplicationContext context =  new ClassPathXmlApplicationContext("spring-mybatis.xml");
       UserMapper userMapper =  context.getBean("userMapper",UserMapper.class);
        for (User user : userMapper.selectUser()) {
            System.out.println(user);
        }

    }
}

在这里插入图片描述

在这里插入图片描述

方式二：使用SqlSessionDaoSupport

在这里插入图片描述

package com.my.mapper;

import com.my.pojo.User;
import org.apache.ibatis.session.SqlSession;
import org.mybatis.spring.support.SqlSessionDaoSupport;

import java.util.List;

public class UserMapperImpl2 extends SqlSessionDaoSupport implements UserMapper {
    public List<User> selectUser() {
        SqlSession sqlSession = getSqlSession();
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        return mapper.selectUser();
    }
}

在这里插入图片描述

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