Spring学习（八）——整合Mybatis

约定不等于承诺〃 2023-01-01 10:58 259阅读 0赞

### 整合Mybatis ###

*  整合步骤
 *  Mybatis和Spring直接整合
 *  利用Mybatis-spring配置整合
 *   *  方式一：使用SqlSessionTemplate
     *  方式二：使用SqlSessionDaoSupport

# 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>
    
           
            <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">
    
    <configuration>
        <typeAliases>
            <package name="com.my.pojo"/>
            
        </typeAliases>
        <environments default="development">
            <environment id="development">
                <transactionManager type="JDBC"/>
                <dataSource type="POOLED">
                    <property name="driver" value="com.mysql.jdbc.Driver"/>
                    <property name="url" value="jdbc:mysql://localhost:3306/mybatis?userSSL=false&userUnicode=true&characterEncoding=utf-8"/>
                    <property name="username" value="root"/>
                    <property name="password" value="123456"/>
                </dataSource>
            </environment>
        </environments>
    
        
        <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">
    
    <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][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoYXJfbQ_size_16_color_FFFFFF_t_70]

package com.my.mapper;
    
    import com.my.pojo.User;
    
    import java.util.List;
    
    public interface UserMapper {
        
        public List<User> selectUser();
    }

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][20210104143004876.png]  
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][20210104144237513.png]

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">
    
    
        <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&userUnicode=true&characterEncoding=utf-8"/>
            <property name="username" value="root"/>
            <property name="password" value="123456"/>
        </bean>
    
    
        <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
            <property name="dataSource" ref="dataSource" />
            
            <property name="configLocation" value="classpath:mybatis-config.xml"/>
            <property name="mapperLocations" value="classpath:com/my/mapper/*.xml"/>
        </bean>
    
        
        <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
            
            <constructor-arg index="0" ref="sqlSessionFactory"/>
        </bean>
    
        
        <bean id="userMapper" class="com.my.mapper.UserMapperImpl">
            <property name="sqlSession" ref="sqlSession"/>
        </bean>
    
    </beans>

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoYXJfbQ_size_16_color_FFFFFF_t_70 1]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoYXJfbQ_size_16_color_FFFFFF_t_70 2]  
总流程：  
1、编写数据源  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoYXJfbQ_size_16_color_FFFFFF_t_70 3]  
2、在spring’中配置sqlSessionFactory  
![在这里插入图片描述][20210104152535106.png]  
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][20210104152750465.png]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoYXJfbQ_size_16_color_FFFFFF_t_70 4]

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][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoYXJfbQ_size_16_color_FFFFFF_t_70 5]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoYXJfbQ_size_16_color_FFFFFF_t_70 6]

## 方式二：使用SqlSessionDaoSupport ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoYXJfbQ_size_16_color_FFFFFF_t_70 7]

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][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoYXJfbQ_size_16_color_FFFFFF_t_70 8]

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[20210104143004876.png]: /images/20221120/194aca467ec9487d98ad139eca08dc6c.png
[20210104144237513.png]: /images/20221120/bf2918b8b6824d05ad45622d31327f7e.png
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[20210104152535106.png]: /images/20221120/4b1cc6c63ca84895957d945a44f3b941.png
[20210104152750465.png]: /images/20221120/bf45fa54483b437a95451da1bd6cbf6b.png
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