整合Mybatis和Spring
本文学自b站狂神，并加上了自己的理解：：狂神说：spring篇
一、准备
1.1步骤：
- 导入相关的jar包
- junit
- mybatis
- mysql数据库
- spring相关的
- aop织入
- mybatis-spring【new】
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
<!--mysql连接数据库的包-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.47</version>
</dependency>
<!--mybatis包-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.2</version>
</dependency>
<!--spring5包-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.1.9.RELEASE</version>
</dependency>
<!--Spring操作数据库的话，还需要一个spring-jdbc-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.1.9.RELEASE</version>
</dependency>
<!--切面织入包-->
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.8.13</version>
</dependency>
<!--mybatis和spring整合包-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>2.0.2</version>
</dependency>
<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>
- 编写配置文件
- 测试
1.2、回忆mybatis
- 编写实体类
- 编写核心配置文件
- 编写接口
- 编写Mapper.xml
- 测试
二、整合
2.1、新建一个com.lxf.pojo包，并在此包下建一个User类：
package com.lxf.pojo;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
private int id;
private String name;
private String pwd;
}
2.2、新建一个com.lxf.mapper包，并在此包下建一个UserMapper接口和一个UserMapper.xml文件
UserMapper接口类：
package com.lxf.mapper;
import com.lxf.pojo.User;
import java.util.List;
public interface UserMapper {
//获取所有的user
List<User> getAllUsers();
}
UserMapper.xml文件：
<?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.lxf.mapper.UserMapper">
<select id="getAllUsers" resultType="com.lxf.pojo.User">
select * from user
</select>
</mapper>
2.3、新建一个mybatis-config.xml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核心配置文件-->
<configuration>
<!--设置-->
<settings>
<!--配置日志-->
<setting name="logImpl" value="STDOUT_LOGGING"/>
<!--配置驼峰命名映射-->
<setting name="mapUnderscoreToCamelCase" value="true"/>
<!--开启全局缓存-->
<setting name="cacheEnabled" value="true"/>
</settings>
<!--可以给实体类起别名-->
<typeAliases>
<package name="com.lxf.pojo"/>
</typeAliases>
</configuration>
2.4、新建一个spring-dao.xml文件：
<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，c3p0 dbcp druid
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&useUnicode=true&characterEncoding=utf-8&allowMultiQueries=true"/>
<property name="username" value="root"/>
<property name="password" value="root"/>
</bean>
<!--配置sqlSessionFactory-->
<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/lxf/mapper/*.xml"/>
</bean>
</beans>
2.5、在com.lxf.mapper包下追加一个代理类UserMapperImpl.java：
package com.lxf.mapper;
import com.lxf.pojo.User;
import org.mybatis.spring.support.SqlSessionDaoSupport;
import java.util.List;
public class UserMapperImpl extends SqlSessionDaoSupport implements UserMapper {
@Override
public List<User> getAllUsers() {
return getSqlSession().getMapper(UserMapper.class).getAllUsers();
}
}
2.6、新建一个applicationContext.xml文件：
<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
https://www.springframework.org/schema/beans/spring-beans.xsd">
<!--引入spring-dao.xml文件-->
<import resource="classpath:spring-dao.xml"/>
<bean id="userMapperImpl" class="com.lxf.mapper.UserMapperImpl">
<property name="sqlSessionFactory" ref="sqlSessionFactory"/>
</bean>
</beans>
三、测试
在test.java目录下新建一个Mytest类进行测试：
import com.lxf.mapper.UserMapperImpl;
import com.lxf.pojo.User;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import java.util.List;
public class Mytest {
@Test
public void getAllUsers(){
ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
List<User> users = applicationContext.getBean("userMapperImpl", UserMapperImpl.class).getAllUsers();
for (User user : users) {
System.out.println("user = " + user);
}
}
}