SSM-Spring整合Mybatis[通俗易懂]

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步驟

导入相关jar包
- junit
- mybatis
- mysql数据库
- spring相关的
- aop植入
- mybatis-spring[new]

<!--导入依赖-->
<dependencies>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.46</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.2</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.2.0.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.2.0.RELEASE</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.9.4</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>2.0.2</version>
</dependency>
</dependencies>

编写配置文件
测试

回忆Mybatis

编写实体类

package com.kuang.pojo;
public class User { 

private int id;
private  String name;
private String pwd;
public User() { 

}
public User(int id, String name, String pwd) { 

this.id = id;
this.name = name;
this.pwd = pwd;
}
public void setId(int id) { 

this.id = id;
}
public void setName(String name) { 

this.name = name;
}
public void setPwd(String pwd) { 

this.pwd = pwd;
}
@Override
public String toString() { 

return "User{" +
"id=" + id +
", name='" + name + '\'' +
", pwd='" + pwd + '\'' +
'}';
}
public int getId() { 

return id;
}
public String getName() { 

return name;
}
public String getPwd() { 

return 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>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings>
<typeAliases>
<package name="com.kuang.pojo"/>
</typeAliases>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC" />
<!-- 配置数据库连接信息 -->
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost:3306/mybatis?useSSL=true&amp;useUnicode=true&amp;characterEncoding=UTF-8" />
<property name="username" value="root" />
<property name="password" value="924930871111" />
</dataSource>
</environment>
</environments>
<!--每一个Mapper.XML都需要在Mybatis核心核心配置文件中注册-->
<mappers>
<mapper class="com.kuang.mapper.UserMapper"/>
</mappers>
</configuration>

编写接口

package com.kuang.mapper;
import com.kuang.pojo.User;
import java.util.List;
public interface UserMapper { 

public List<User> selectUser();
}

编写Mapper.xml文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<!--namespace绑定一个对应的Dao/Mapper接口-->
<mapper namespace="com.kuang.mapper.UserMapper">
<select id="selectUser" resultType="user">
select * from mybatis.user;
</select>
</mapper>

测试

import com.kuang.mapper.UserMapper;
import com.kuang.pojo.User;
import com.kuang.utils.MybatisUtils;
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 java.io.IOException;
import java.io.InputStream;
import java.util.List;
public class Test { 

public static void main(String[] args) { 

return;
}
@org.junit.Test
public void test() throws IOException { 

String resources = "mybatis-config.xml";
InputStream resourceAsStream = Resources.getResourceAsStream(resources);
SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(resourceAsStream);
SqlSession sqlSession = sessionFactory.openSession(true);
UserMapper mapper = sqlSession.getMapper(UserMapper.class);
List<User> userList = mapper.selectUser();
for(User user:userList){ 

System.out.println(user);
}
}
}

整合关键：Mybatis-Spring

方式1

整合步骤

编写配置文件

<?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:context="http://www.springframework.org/schema/context" 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/context https://www.springframework.org/schema/context/spring-context.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 c3p0 dbcp 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.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/mybatis?useSSL=true&amp;useUnicode=true&amp;characterEncoding=UTF-8" />
<property name="username" value="root"/>
<property name="password" value="924930871111"/>
</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/kuang/mapper/*.xml"/>
</bean>
<!--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,因为他没有set方法-->
<constructor-arg index="0" ref="sqlSessionFactory"/>
</bean>
<bean id="userMapper" class="com.kuang.mapper.UserMapperImpl">
<property name="sqlSession" ref="sqlSession"/>
</bean>
</beans>

需要给接口加实现类

package com.kuang.mapper;
import com.kuang.pojo.User;
import org.apache.ibatis.session.SqlSession;
import java.util.List;
public class UserMapperImpl implements UserMapper{ 

private SqlSession sqlSession;
public void setSqlSession(SqlSession sqlSession) { 

this.sqlSession = sqlSession;
}
public List<User> selectUser() { 

UserMapper mapper = sqlSession.getMapper(UserMapper.class);
return mapper.selectUser();
}
}

在这里插入图片描述

将自己写的实现类，注入到Spring
测试使用

import com.kuang.mapper.UserMapper;
import com.kuang.pojo.User;
import com.kuang.utils.MybatisUtils;
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.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
public class Test { 

public static void main(String[] args) { 

return;
}
@org.junit.Test
public void test() throws IOException { 

ApplicationContext context = new ClassPathXmlApplicationContext("spring-dao.xml");
UserMapper userMapper = context.getBean("userMapper", UserMapper.class);
for(User user:userMapper.selectUser()){ 

System.out.println(user);
}
}
}

方式二：利用继承类

不需要在Spring中注册SqlSession，只需要改动xml和测试类即可

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

package com.kuang.mapper;
import com.kuang.pojo.User;
import org.mybatis.spring.support.SqlSessionDaoSupport;
import java.util.List;
public class UserMapperImpl2 extends SqlSessionDaoSupport implements UserMapper { 

public List<User> selectUser() { 

return  getSqlSession().getMapper(UserMapper.class).selectUser();
}
}

Spring事务管理

声明式事务
编程式事务

主要讲解声明式事务
思想是利用SpringAOP思想，通过配置文件的方式进行事务的管理
xml配置文件

    <!--配置声明式事务-->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"/>
</bean>
<!--结合Aop实现事务的植入-->
<!--配置事务通知-->
<tx:advice id="txAdvice" transaction-manager="transactionManager">
<!--给那些方法配置事务-->
<!--配置事务的传播特性：new propagation-->
<tx:attributes>
<tx:method name="add" propagation="REQUIRED"/>
<tx:method name="update" propagation="REQUIRED"/>
<tx:method name="delete" propagation="REQUIRED"/>
<tx:method name="query" propagation="REQUIRED"/>
<tx:method name="*" propagation="REQUIRED"/>
</tx:attributes>
</tx:advice>
<!--配置事务切入-->
<aop:config>
<aop:pointcut id="txPointCut" expression="execution(* com.kuang.mapper.*.*(..))"/>
<aop:advisor advice-ref="txAdvice" pointcut-ref="txPointCut"/>
</aop:config>

声明类

package com.kuang.mapper;
import com.kuang.pojo.User;
import org.mybatis.spring.support.SqlSessionDaoSupport;
import java.util.List;
public class UserMapperImpl2 extends SqlSessionDaoSupport implements UserMapper { 

public List<User> selectUser() { 

User user = new User(5,"小王","12345");
UserMapper mapper = getSqlSession().getMapper(UserMapper.class);
mapper.addUser(user);
mapper.deleteUser(5);
return mapper.selectUser();
}
public int addUser(User user) { 

return getSqlSession().getMapper(UserMapper.class).addUser(user);
}
public int deleteUser(int id) { 

return getSqlSession().getMapper(UserMapper.class).deleteUser(id);
}
}

测试

import com.kuang.mapper.UserMapper;
import com.kuang.pojo.User;
import com.kuang.utils.MybatisUtils;
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.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
public class Test { 

public static void main(String[] args) { 

return;
}
@org.junit.Test
public void test() throws IOException { 

ApplicationContext context = new ClassPathXmlApplicationContext("spring-dao.xml");
UserMapper userMapper = context.getBean("userMapper2", UserMapper.class);
for(User user:userMapper.selectUser()){ 

System.out.println(user);
}
}
}

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SSM-Spring整合Mybatis[通俗易懂]

方式1

方式二：利用继承类

Spring事务管理

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