一、POM 文件引入 JAR
在 pom.xml 中引入 jta-atomikos
以及测试包
<!-- mybatis 依赖 -->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.1.1</version>
</dependency>
<!-- atomikos 多数据源管理 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jta-atomikos</artifactId>
</dependency>
<!-- mysql 依赖 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<!-- 测试 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
</exclusion>
</exclusions>
</dependency>
<!-- SpringBoot 2.0 的 spring-boot-starter-test 中的spring-test 是5.0.4 版本的,
而,5.0.4 版没有 SpringJUnit4ClassRunner 和 SpringRunner 所以去除,另加入5.0.5 及以上版本的spring-test-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>5.0.5.RELEASE</version>
<scope>test</scope>
</dependency>
二、application.properties 新增配置
在 application.properties
中添加两个数据源的配置
mysql.datasource.test1.url = jdbc:mysql://localhost:3306/mysql
mysql.datasource.test1.username = root
mysql.datasource.test1.password = 123456
mysql.datasource.test1.minPoolSize = 3
mysql.datasource.test1.maxPoolSize = 25
mysql.datasource.test1.maxLifetime = 20000
mysql.datasource.test1.borrowConnectionTimeout = 30
mysql.datasource.test1.loginTimeout = 30
mysql.datasource.test1.maintenanceInterval = 60
mysql.datasource.test1.maxIdleTime = 60
mysql.datasource.test2.url = jdbc:mysql://localhost:3306/mybatis
mysql.datasource.test2.username =root
mysql.datasource.test2.password = 123456
mysql.datasource.test2.minPoolSize = 3
mysql.datasource.test2.maxPoolSize = 25
mysql.datasource.test2.maxLifetime = 20000
mysql.datasource.test2.borrowConnectionTimeout = 30
mysql.datasource.test2.loginTimeout = 30
mysql.datasource.test2.maintenanceInterval = 60
mysql.datasource.test2.maxIdleTime = 60
使用 application.yml
的配置为
### two datasource Configuration
mysql:
datasource:
test1:
url: jdbc:mysql://localhost:3306/mysql
driver-class-name: com.mysql.jdbc.Driver
username: root
password: 123456
minPoolSize: 3
maxPoolSize: 25
maxLifetime: 20000
borrowConnectionTimeout: 30
loginTimeout: 30
maintenanceInterval: 60
maxIdleTime: 60
test2:
url: jdbc:mysql://localhost:3306/mybatis
driver-class-name: com.mysql.jdbc.Driver
username: root
password: 123456
minPoolSize: 3
maxPoolSize: 25
maxLifetime: 20000
borrowConnectionTimeout: 30
loginTimeout: 30
maintenanceInterval: 60
maxIdleTime: 60
三、编写 Dao
添加两个 bean
文件 src/main/java/com/bean/MybatisUser.java
和 src/main/java/com/bean/MysqlUser.java
。
src/main/java/com/bean/MybatisUser.java
package com.bean;
import lombok.Getter;
import lombok.Setter;
import lombok.ToString;
/**
* @Description 类描述
* @author 欧阳
* @since 2019年4月7日 下午12:29:13
* @version V1.0
*/
@Getter
@Setter
@ToString
public class MybatisUser {
private String id;
private String name;
public MybatisUser() {
super();
}
public MybatisUser(String id, String name) {
super();
this.id = id;
this.name = name;
}
}
src/main/java/com/bean/MysqlUser.java
package com.bean;
import lombok.Getter;
import lombok.Setter;
import lombok.ToString;
/**
* @Description 类描述
* @author 欧阳
* @since 2019年4月7日 下午12:29:13
* @version V1.0
*/
@Getter
@Setter
@ToString
public class MysqlUser {
private String id;
private String name;
public MysqlUser() {
super();
}
public MysqlUser(String id, String name) {
super();
this.id = id;
this.name = name;
}
}
根据库的区别,创建两个包 com.mysql
和 com.mybatis
,分别在包下创建 Mapper 。
在 com.mysql
包下创建 src/main/java/com/mysql/UserMapper2.java
和 src/main/java/com/mysql/userMapper2.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.mysql.UserMapper2">
<insert id="insertUser" parameterType="com.bean.MysqlUser">
insert into t_user(id, name) values(#{id}, #{name})
</insert>
<select id="selectUsersAll" resultType="com.bean.MysqlUser">
select id,name from t_user
</select>
<update id="updateUser" parameterType="com.bean.MysqlUser">
update t_user set name=#{name} where id=#{id}
</update>
<delete id="deleteUserById" parameterType="string">
delete from t_user where id = #{id}
</delete>
</mapper>
package com.mysql;
import java.util.List;
import com.bean.MysqlUser;
/**
* @Description springboot 整合jta-atomikos 数据源2
* @author 欧阳
* @since 2019年4月11日 下午4:26:00
* @version V1.0
*/
public interface UserMapper2 {
/**
* 添加用户
* @param user
*/
public void insertUser(MysqlUser mysqlUser);
/**
* 更新用户
* @param user
*/
public void updateUser(MysqlUser mysqlUser);
/**
* 查询用户
* @param user
* @return
*/
public List<MysqlUser> selectUsersAll();
/**
* 删除用户
* @param id
*/
public void deleteUserById(String id);
}
在 com.mysql
包下创建 src/main/java/com/mybatis/UserMapper1.java
和 src/main/java/com/mybatis/userMapper1.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.mybatis.UserMapper1">
<insert id="insertUser" parameterType="com.bean.MybatisUser">
insert into t_user(id, name) values(#{id}, #{name})
</insert>
<select id="selectUsersAll" resultType="com.bean.MybatisUser">
select id,name from t_user
</select>
<update id="updateUser" parameterType="com.bean.MybatisUser">
update t_user set name=#{name} where id=#{id}
</update>
<delete id="deleteUserById" parameterType="string">
delete from t_user where id = #{id}
</delete>
</mapper>
package com.mybatis;
import java.util.List;
import com.bean.MybatisUser;
/**
* @Description springboot 整合jta-atomikos 数据源1
* @author 欧阳
* @since 2019年4月11日 下午4:26:00
* @version V1.0
*/
public interface UserMapper1 {
/**
* 添加用户
* @param user
*/
public void insertUser(MybatisUser mybatisUser);
/**
* 更新用户
* @param user
*/
public void updateUser(MybatisUser mybatisUser);
/**
* 查询用户
* @param user
* @return
*/
public List<MybatisUser> selectUsersAll();
/**
* 删除用户
* @param id
*/
public void deleteUserById(String id);
}
四、添加 Service
添加一个统一的 Service 接口 src/main/java/com/service/MoreDateSourceService.java
并实现该接口,实现类 src/main/java/com/service/impl/MoreDateSourceServiceImpl.java
统一调用两个数据源,测试整合 jta-atomikos
实现分布式事务管理的正确性,以向两个数据库中添加用户为例。
MoreDateSourceService 接口代码
package com.service;
import com.bean.MybatisUser;
import com.bean.MysqlUser;
/**
* @Description 多数据源事务管理 Service
* @author 欧阳
* @since 2019年4月11日 下午8:34:50
* @version V1.0
*/
public interface MoreDateSourceService {
public void addUser(MybatisUser mybatisUser, MysqlUser mysqlUser);
}
MoreDateSourceServiceImpl 实现类
package com.service.impl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import com.bean.MybatisUser;
import com.bean.MysqlUser;
import com.mybatis.UserMapper1;
import com.mysql.UserMapper2;
import com.service.MoreDateSourceService;
/**
* @Description 多数据源事务管理 Service
* @author 欧阳
* @since 2019年4月11日 下午8:35:42
* @version V1.0
*/
@Service
public class MoreDateSourceServiceImpl implements MoreDateSourceService {
@Autowired
private UserMapper2 userMapper2;
@Autowired
private UserMapper1 userMapper1;
@Override
@Transactional
public void addUser(MybatisUser mybatisUser, MysqlUser mysqlUser) {
userMapper1.insertUser(mybatisUser);
userMapper2.insertUser(mysqlUser);
// int num = 1/0; //放开测试事务。预期结果为两个库都添加失败,库中无数据。测试结果与预期一致
}
}
注意:通过使用 @Transactional
注解添加事务管理。第一种情况,在 addUser
方法中的插入数据代码后增加异常代码 int num = 1/0;
,测试事务是否起作用,如果不起作用,则两个库中都有刚插入的数据,反之两个库中都没有刚插入的数据;第二种情况,注释异常代码 int num = 1/0;
,数据会正常插入到两个库中。测试后实际测试结果表明测试结果与预期一致,整合 jta-atomikos
后可通过使用 @Transactional
注解可管理分布式事务。
五、测试类
添加测试类测试 MoreDateSourceServiceImplTest
package com.service.impl;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import com.App;
import com.bean.MybatisUser;
import com.bean.MysqlUser;
import com.service.MoreDateSourceService;
/**
* @Description 多数据源事务管理 测试
* @author 欧阳
* @since 2019年4月11日 下午8:45:21
* @version V1.0
*/
@RunWith(SpringRunner.class)
@SpringBootTest(classes={App.class})
public class MoreDateSourceServiceImplTest {
@Autowired
private MoreDateSourceService moreDateSourceService;
@Test
public void testAddUser() {
MybatisUser mybatisUser = new MybatisUser("12", "张三");
MysqlUser mysqlUser = new MysqlUser("12", "张三");
moreDateSourceService.addUser(mybatisUser, mysqlUser);
System.out.println("Yes");
}
}
六、测试结果
测试结果通过,通过整合 jta-atomikos
实现分布式事务管理功能正常,springboot 整合 jta-atomikos
完成。