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整合mybatis

2022-06-15 18:01:11 作者：互联网

声明

本文为其他博主原创文章整合，仅用作个人学习，特此声明

参考文章链接

(3条消息) B站 - 狂神 - Spring5课堂笔记_夜里的雨的博客-CSDN博客_狂神spring5笔记

12、整合mybatis

mybatis-spring官网：https://mybatis.org/spring/zh/

mybatis的配置流程：

编写实体类
编写核心配置文件
编写接口
编写Mapper.xml
测试

什么是mybatis-spring？

MyBatis-Spring 会帮助你将 MyBatis 代码无缝地整合到 Spring 中。它将允许 MyBatis 参与到 Spring 的事务管理之中，创建映射器 mapper 和 SqlSession 并注入到 bean 中，以及将 Mybatis 的异常转换为 Spring 的 DataAccessException。最终，可以做到应用代码不依赖于 MyBatis，Spring 或 MyBatis-Spring。

12.1mybatis-spring-方式一

编写数据源配置
sqISessionFactory
sqISessionTemplate（相当于sqISession）
需要给接口加实现类【new】
将自己写的实现类，注入到Spring中
测试！

1.导入jar包

<dependencies>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>5.2.7.RELEASE</version>
    </dependency>

    <dependency>
        <groupId>org.aspectj</groupId>
        <artifactId>aspectjweaver</artifactId>
        <version>1.9.4</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>5.2.7.RELEASE</version>
    </dependency>

    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.5.2</version>
    </dependency>

    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis-spring</artifactId>
        <version>2.0.4</version>
    </dependency>

    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>8.0.12</version>
    </dependency>

    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>1.18.12</version>
    </dependency>

</dependencies>
	
<!--在build中配置resources，来防止资源导出失败的问题-->
<!-- Maven解决静态资源过滤问题 -->
<build>
<resources>
    <resource>
        <directory>src/main/java</directory>
        <includes>
            <include>**/*.properties</include>
            <include>**/*.xml</include>
        </includes>
        <filtering>false</filtering>
    </resource>
    <resource>
        <directory>src/main/resources</directory>
        <includes>
            <include>**/*.properties</include>
            <include>**/*.xml</include>
        </includes>
        <filtering>false</filtering>
    </resource>
</resources>
</build>

mapper目录下的 UserMapper、UserMapperImpl、UserMapper.xml

2.pojo实体类User

package pojo;
import lombok.Data;
@Data
public class User {
	private int id;
	private String name;
	private String pwd;
}

3.接口UserMapper

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

4.接口实现类UserMapperImpl

package mapper;
import java.util.List;
import org.mybatis.spring.SqlSessionTemplate;
import pojo.User;

public class UserMapperImpl implements UserMapper{
	
	//我们的所有操作，在原来都使用sqlSession来执行，现在使用SqlSessionTemplate；
	private SqlSessionTemplate sqlSessionTemplate;

	public void setSqlSessionTemplate(SqlSessionTemplate sqlSessionTemplate) {
		this.sqlSessionTemplate = sqlSessionTemplate;
	}

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

5.UserMapper.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">
        
<!-- 绑定接口 -->
<mapper namespace="mapper.UserMapper">
	<select id="getUser" resultType="pojo.User">
		select * from mybatis.mybatis
	</select>
</mapper>

resource目录下的 mybatis-config.xml、spring-dao.xml、applicationContext.xml

6.mybatis-config.xml

<?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>
	<!--开启日志-->
	<settings>
		<setting name="logImpl" value="STDOUT_LOGGING" />
	</settings>
	
	<!--可以给实体类起别名 -->
	<typeAliases> 
		<package name="pojo" />
	</typeAliases>

</configuration>

7.spring-dao.xml

<?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
		https://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/aop
		https://www.springframework.org/schema/aop/spring-aop.xsd">
		
	<!--DataSource:使用Spring的数据源替换Mybatis的配置 其他数据源：c3p0、dbcp、druid 
		这使用Spring提供的JDBC: org.springframework.jdbc.datasource -->
	<!--data source -->
	<bean id="datasource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
		<property name="driverClassName"
			value="com.mysql.jdbc.Driver" />
		<property name="url" value="jdbc:mysql://127.0.0.1:3306/mybatis?useSSL=false&amp;useUnicode=true&amp;characterEncoding=utf-8&amp;serverTimezone=Asia/Shanghai"/>
		<property name="username" value="root" />
		<property name="password" value="xy680501*" />
	</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:mapper/*.xml"/>
    </bean>

	<!-- sqlSessionTemplate 就是之前使用的：sqlsession -->
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
    	<!-- 只能使用构造器注入sqlSessionFactory 原因：它没有set方法-->	
        <constructor-arg index="0" ref="sqlSessionFactory"/>
    </bean>
		
</beans>

8.applicationContext.xml

<?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
		https://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/aop
		https://www.springframework.org/schema/aop/spring-aop.xsd">
    
	<!-- 导入spring-dao.xml -->
	<import resource="spring-dao.xml"/>
	
    <bean id="userMapper" class="mapper.UserMapperImpl">
        <property name="sqlSessionTemplate" ref="sqlSession"></property>
    </bean>

</beans>

测试类

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import mapper.UserMapper;
import pojo.User;
public class MyTest6 {
	public static void main(String[] args) {
        
		ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
		
		UserMapper userMapper = (UserMapper) context.getBean("userMapper");
		
		for (User user : userMapper.getUser()) {
			System.out.println(user);
		}
	}
}

12.2mybatis-spring-方式二

UserServiceImpl2：继承SqlSessionDaoSupport 类(不用配置SqlSessionTemplate)

package mapper;
import pojo.User;
import org.apache.ibatis.session.SqlSession;
import org.mybatis.spring.support.SqlSessionDaoSupport;
import java.util.List;
//继承SqlSessionDaoSupport 类
public class UserMapperImpl2 extends SqlSessionDaoSupport implements UserMapper {
    public List<User> getUser() {
        SqlSession sqlSession = getSqlSession();
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        return mapper.getUser();
        //或者一句话：return getSqlSession().getMapper(UserMapper.class).getUser();
    }
}

spring-dao.xml

<?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
		https://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/aop
		https://www.springframework.org/schema/aop/spring-aop.xsd">
		
	<!--DataSource:使用Spring的数帮源替换Mybatis的配置 c3p0 dbcp druid 
		这使用Spring提供的JDBC: org.springframework.jdbc.datasource -->
	<!--data source -->
	<bean id="datasource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
		<property name="driverClassName"
			value="com.mysql.jdbc.Driver" />
		<property name="url" value="jdbc:mysql://127.0.0.1:3306/mybatis?useSSL=false&amp;useUnicode=true&amp;characterEncoding=utf-8&amp;serverTimezone=Asia/Shanghai"/>
		<property name="username" value="root" />
		<property name="password" value="xy680501*" />
	</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:mapper/*.xml"/>
    </bean>
    
	<!-- 方法二：SqlSessionTemplate 可以不写了-->
    
</beans>

applicationContext.xml

<?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
		https://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/aop
		https://www.springframework.org/schema/aop/spring-aop.xsd">

	<import resource="spring-dao.xml" />

	<!-- 方法二 -->
	<bean id="userMapper2" class="mapper.UserMapperImpl2">
		<property name="sqlSessionFactory" ref="sqlSessionFactory"></property>
	</bean>
</beans>

测试

public class MyTest6 {
	public static void main(String[] args) {
		ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
		UserMapper userMapper = (UserMapper) context.getBean("userMapper2");
		for (User user : userMapper.getUser()) {
			System.out.println(user);
		}
	}
}

标签：xml,spring,UserMapper,整合,mybatis,import,public
来源： https://www.cnblogs.com/xypersonal/p/16379336.html