【Spring 持久层】Spring 与 Mybatis 整合，spring 教程极客学院
);
创建 DAO 接口：
UserDAO
public interface UserDAO {
public void save(User user);
}
实现 Mapper 文件：
UserDAOMapper.xml
<?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">
<mapper namespace="com.yusael.mybatis.UserDAO">
<insert id="save" parameterType="user">
insert into t_users(name, password) values (#{name}, #{password})
</insert>
</mapper>
注册 Mapper 文件
mybatis-config.xml
<mappers>
<mapper resource="UserDAOMapper.xml"/>
</mappers>
MybatisAPI 调用
public class TestMybatis {
public static void main(String[] args) throws IOException {
InputStream inputStream = Resources.getResourceAsStream("mybatis-config.xml");
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
SqlSession session = sqlSessionFactory.openSession();
UserDAO userDAO = session.getMapper(UserDAO.class);
User user = new User();
user.setName("yusael");
user.setPassword("123456");
userDAO.save(user);
session.commit();
}
}
===================================================================================
问题：配置繁琐、代码冗余
实体
实体别名 配置繁琐
表
创建 DAO 接口
实现 Mapper 文件
注册 Mapper 文件 配置繁琐
Mybatis API 调用 代码冗余
========================================================================================
===========================================================================================
配置文件（ApplicationContext.xml）进行相关配置（只需要配置一次）
编码
1.实体类
2.表
3.创建 DAO 接口
4.Mapper 文件配置
=========================================================================================
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.2.6.RELEASE</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>2.0.4</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.12</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.43</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.4</version>
</dependency>
<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
http://www.springframework.org/schema/beans/spring-beans.xsd">
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/yus?useSSL=false"/>
<property name="username" value="root"/>
<property name="password" value="1234"/>
</bean>
<bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<property name="typeAliasesPackage" value="com.yusael.entity"/>
<property name="mapperLocations">
<list>
<value>classpath:com.yusael.dao/*Mapper.xml</value>
</list>
</property>
</bean>
<bean id="scanner" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactoryBean"/>
<property name="basePackage" value="com.yusael.dao"/>
</bean>
</beans>
实体
com.yusael.entity.User
public class User implements Serializable {
private Integer id;
private String name;
private String password;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
表
t_user
create table t_users values (
id int(11) primary key auto_increment,
name varchar(12),
password varchar(12)
);
DAO 接口
com.yusael.dao.UserDAO
public interface UserDAO {
public void save(User user);
}
Mapper 文件配置
resources/applicationContext.xml
<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
http://www.springframework.org/schema/beans/spring-beans.xsd">
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/yus?useSSL=false"/>
<property name="username" value="root"/>
<property name="password" value="1234"/>
</bean>
<bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<property name="typeAliasesPackage" value="com.yusael.entity"/>
<property name="mapperLocations">
<list>
<value>classpath:com.yusael.dao/*Mapper.xml</value>
</list>
</property>
</bean>
<bean id="scanner" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactoryBean"/>
<property name="basePackage" value="com.yusael.dao"/>
</bean>
</beans>
测试
/**
用于测试: Spring 与 Mybatis 的整合
*/
@Test
public void test() {
ApplicationContext ctx = new ClassPathXmlApplicationContext("/applicationContext.xml");
UserDAO userDAO = (UserDAO) ctx.getBean("userDAO");
User user = new User();
user.setName("xiaojr");
user.setPassword("999999");
userDAO.save(user);
}
问题：Spring 与 Myabatis 整合后，为什么 DAO 不提交事务，但是数据能够插入数据库中？
评论