19.从零开始学springboot-jdbc-atomikos多数据源分布式事务案例

前言

上章我们通过jpa和atomikos实现了分布式事务的处理案例。这节，我们来实现jdbc多数据源+atomikos的方式来实现分布式事务的处理案例。

Atomikos介绍

Atomikos 是一个为Java平台提供增值服务的并且开源类事务管理器。我们通过它来管理事务。springboot本身对其有很好的支持，依赖为spring-boot-starter-jta-atomikos。

创建空项目

添加依赖

 <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jta-atomikos</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
      </dependency>

添加配置

application.yml：

spring:
  datasource:
    master:
      username: root
      password: 123456
      url: jdbc:mysql://192.168.145.131:3306/test
      driver-class-name: com.mysql.cj.jdbc.Driver
    slave:
      username: root
      password: 123456
      url: jdbc:mysql://192.168.145.131:3306/test2
      driver-class-name: com.mysql.cj.jdbc.Driver

建库

创建test、test2库 test：

CREATE TABLE `student` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `age` int(11) NOT NULL,
  `grade` int(11) NOT NULL,
  `name` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;

test2:

CREATE TABLE `teacher` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `age` int(11) NOT NULL,
  `course` int(11) NOT NULL,
  `name` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

完善

目录结构

根据目录结构，请自行创建package和class。

config/DataSourceConfig

package com.mrcoder.sbjdbcmultidbatomikos.config;

import com.atomikos.icatch.jta.UserTransactionImp;
import com.atomikos.icatch.jta.UserTransactionManager;
import com.atomikos.jdbc.AtomikosDataSourceBean;
import com.mysql.cj.jdbc.MysqlXADataSource;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.autoconfigure.jdbc.DataSourceProperties;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.DependsOn;
import org.springframework.context.annotation.Primary;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import org.springframework.transaction.jta.JtaTransactionManager;

import javax.sql.DataSource;
import javax.transaction.TransactionManager;
import javax.transaction.UserTransaction;
import java.sql.SQLException;

@Configuration
@EnableTransactionManagement(proxyTargetClass = true)
public class DataSourceConfig {

    //事务管理器配置start
    @Bean(name = "userTransaction")
    public UserTransaction userTransaction() throws Throwable {
        UserTransactionImp userTransactionImp = new UserTransactionImp();
        userTransactionImp.setTransactionTimeout(10000);
        return userTransactionImp;
    }

    @Bean(name = "atomikosTransactionManager", initMethod = "init", destroyMethod = "close")
    public TransactionManager atomikosTransactionManager() throws Throwable {
        UserTransactionManager userTransactionManager = new UserTransactionManager();
        userTransactionManager.setForceShutdown(true);
        return userTransactionManager;
    }

    @Bean(name = "transactionManager")
    @DependsOn({"userTransaction", "atomikosTransactionManager"})
    public PlatformTransactionManager transactionManager() throws Throwable {
        UserTransaction userTransaction = userTransaction();
        TransactionManager atomikosTransactionManager = atomikosTransactionManager();
        JtaTransactionManager jtaTransactionManager = new JtaTransactionManager(userTransaction, atomikosTransactionManager);
        jtaTransactionManager.setAllowCustomIsolationLevels(true);
        return jtaTransactionManager;
    }


    //master数据源配置
    @Primary
    @Bean(name = "masterDataSourceProperties")
    @Qualifier("masterDataSourceProperties")
    @ConfigurationProperties(prefix = "spring.datasource.master")
    public DataSourceProperties masterDataSourceProperties() {
        return new DataSourceProperties();
    }

    @Primary
    @Bean(name = "masterDataSource", initMethod = "init", destroyMethod = "close")
    @ConfigurationProperties(prefix = "spring.datasource.master")
    public DataSource masterDataSource() throws SQLException {
        MysqlXADataSource mysqlXaDataSource = new MysqlXADataSource();
        mysqlXaDataSource.setUrl(masterDataSourceProperties().getUrl());
        mysqlXaDataSource.setPinGlobalTxToPhysicalConnection(true);
        mysqlXaDataSource.setPassword(masterDataSourceProperties().getPassword());
        mysqlXaDataSource.setUser(masterDataSourceProperties().getUsername());
        AtomikosDataSourceBean xaDataSource = new AtomikosDataSourceBean();
        xaDataSource.setXaDataSource(mysqlXaDataSource);
        xaDataSource.setUniqueResourceName("xads1");
        xaDataSource.setBorrowConnectionTimeout(60);
        xaDataSource.setMaxPoolSize(20);
        return xaDataSource;

    }

    @Bean(name = "masterJdbcTemplate")
    public JdbcTemplate masterJdbcTemplate() throws SQLException {
        JdbcTemplate jdbcTemplate = new JdbcTemplate(masterDataSource());
        return jdbcTemplate;
    }

    //slave数据源配置
    @Bean(name = "slaveDataSourceProperties")
    @Qualifier("slaveDataSourceProperties")
    @ConfigurationProperties(prefix = "spring.datasource.slave")
    public DataSourceProperties slaveDataSourceProperties() {
        return new DataSourceProperties();
    }

    @Bean(name = "slaveDataSource", initMethod = "init", destroyMethod = "close")
    @ConfigurationProperties(prefix = "spring.datasource.slave")
    public DataSource slaveDataSource() throws SQLException {
        MysqlXADataSource mysqlXaDataSource = new MysqlXADataSource();
        mysqlXaDataSource.setUrl(slaveDataSourceProperties().getUrl());
        mysqlXaDataSource.setPinGlobalTxToPhysicalConnection(true);
        mysqlXaDataSource.setPassword(slaveDataSourceProperties().getPassword());
        mysqlXaDataSource.setUser(slaveDataSourceProperties().getUsername());
        AtomikosDataSourceBean xaDataSource = new AtomikosDataSourceBean();
        xaDataSource.setXaDataSource(mysqlXaDataSource);
        xaDataSource.setUniqueResourceName("xads2");
        xaDataSource.setBorrowConnectionTimeout(60);
        xaDataSource.setMaxPoolSize(20);
        return xaDataSource;
    }

    @Bean(name = "slaveJdbcTemplate")
    public JdbcTemplate slaveJdbcTemplate() throws SQLException {
        JdbcTemplate jdbcTemplate = new JdbcTemplate(slaveDataSource());
        return jdbcTemplate;
    }
}

entity/Student

package com.mrcoder.sbjdbcmultidbatomikos.entity;

import java.io.Serializable;

public class Student implements Serializable {
    private int id;

    private String name;

    private int age;

    private int grade;

    public Student() {
    }

    public Student(String name, int age, int grade) {
        this.name = name;
        this.age = age;
        this.grade = grade;
    }

    @Override
    public String toString() {
        return "Student{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", age=" + age +
                ", grade=" + grade +
                '}';
    }

    public int getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

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

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public int getGrade() {
        return grade;
    }

    public void setGrade(int grade) {
        this.grade = grade;
    }
}

entity/Teacher

package com.mrcoder.sbjdbcmultidbatomikos.entity;

import java.io.Serializable;

public class Teacher implements Serializable {

    private int id;
    private String name;
    private int age;
    private int course;

    public Teacher() {
    }

    public Teacher(String name, int age, int course) {
        this.name = name;
        this.age = age;
        this.course = course;
    }

    @Override
    public String toString() {
        return "Teacher{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", age='" + age + '\'' +
                ", course='" + course + '\'' +
                '}';
    }

    public int getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

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

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public int getCourse() {
        return course;
    }

    public void setCourse(int course) {
        this.course = course;
    }
}

dao/StuentDao

package com.mrcoder.sbjdbcmultidbatomikos.dao;

import com.mrcoder.sbjdbcmultidbatomikos.entity.Student;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.stereotype.Repository;

import javax.annotation.Resource;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;

@Repository
public class StudentDao {

    @Resource(name = "masterJdbcTemplate")
    private JdbcTemplate masterJdbcTemplate;

    @Resource(name = "slaveJdbcTemplate")
    private JdbcTemplate slaveJdbcTemplate;
    
    class StudentMapper implements RowMapper<Student> {
        @Override
        public Student mapRow(ResultSet resultSet, int i) throws SQLException {
            Student student = new Student();
            student.setAge(resultSet.getInt("age"));
            student.setGrade(resultSet.getInt("grade"));
            student.setName(resultSet.getString("name"));
            return student;
        }
    }


    public int save(Student student) {
        String sql = "INSERT INTO `test`.`student` (`age`, `grade`,`name`) VALUES (?, ?, ?)";
        int result = masterJdbcTemplate.update(sql, new Object[]{student.getAge(), student.getGrade(), student.getName()});
        return result;
    }

    public List<Student> getList() {
        String sql = "select * from student s";
        List<Student> list = masterJdbcTemplate.query(sql, new StudentMapper());
        return list;
    }
}

dao/TeacherDao

package com.mrcoder.sbjdbcmultidbatomikos.dao;

import com.mrcoder.sbjdbcmultidbatomikos.entity.Student;
import com.mrcoder.sbjdbcmultidbatomikos.entity.Teacher;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.stereotype.Repository;

import javax.annotation.Resource;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;

@Repository
public class TeacherDao {

    @Resource(name = "masterJdbcTemplate")
    private JdbcTemplate masterJdbcTemplate;

    @Resource(name = "slaveJdbcTemplate")
    private JdbcTemplate slaveJdbcTemplate;


    class TeacherMapper implements RowMapper<Teacher> {
        @Override
        public Teacher mapRow(ResultSet resultSet, int i) throws SQLException {
            Teacher teacher = new Teacher();
            teacher.setAge(resultSet.getInt("age"));
            teacher.setCourse(resultSet.getInt("course"));
            teacher.setName(resultSet.getString("name"));
            return teacher;
        }
    }


    public int save(Teacher teacher) {
        String sql = "INSERT INTO `test2`.`teacher` (`age`, `course`,`name`) VALUES (?, ?, ?)";
        int result = slaveJdbcTemplate.update(sql, new Object[]{teacher.getAge(), teacher.getCourse(), teacher.getName()});
        return result;
    }

    public List<Teacher> getList() {
        String sql = "select * from teacher t ";
        List<Teacher> list = slaveJdbcTemplate.query(sql, new TeacherMapper());
        return list;
    }
}

service/CurdService

package com.mrcoder.sbjdbcmultidbatomikos.service;

import com.mrcoder.sbjdbcmultidbatomikos.dao.StudentDao;
import com.mrcoder.sbjdbcmultidbatomikos.dao.TeacherDao;
import com.mrcoder.sbjdbcmultidbatomikos.entity.Student;
import com.mrcoder.sbjdbcmultidbatomikos.entity.Teacher;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;

@Service
@Transactional(transactionManager = "transactionManager", propagation = Propagation.REQUIRED, readOnly = false, rollbackFor = {Exception.class})
public class CurdService {

    @Autowired
    private StudentDao studentDao;

    @Autowired
    private TeacherDao teacherDao;

    public void add(int code) {
        Student s1 = new Student();
        s1.setAge(1);
        s1.setGrade(1);
        s1.setName("s1");
        studentDao.save(s1);

        Teacher t1 = new Teacher();
        t1.setAge(1);
        t1.setName("t1");
        t1.setCourse(1);
        teacherDao.save(t1);

        int result = 1 / code;
    }

}

controller/JdbcAtomikosController

package com.mrcoder.sbjdbcmultidbatomikos.controller;


import com.mrcoder.sbjdbcmultidbatomikos.dao.StudentDao;
import com.mrcoder.sbjdbcmultidbatomikos.dao.TeacherDao;
import com.mrcoder.sbjdbcmultidbatomikos.service.CurdService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class JdbcAtomikosController {

    @Autowired
    private StudentDao studentDao;

    @Autowired
    private TeacherDao teacherDao;

    @Autowired
    private CurdService curdService;

    @RequestMapping("/commit")
    public void add() {
        curdService.add(1);
    }

    @RequestMapping("/rollback")
    public void rollback() {
        curdService.add(0);
    }

    @RequestMapping("/list")
    public void list() {
        System.out.println(studentDao.getList());
        System.out.println(teacherDao.getList());
    }
}

运行

http://localhost:8080/commit 会在test库的student和test2库的teacher表中各新增一条记录

http://localhost:8080/rollback 人为的制造1/0的异常，异常触发事务，会发现两张表都不会新增记录。

项目地址

https://github.com/MrCoderStack/SpringBootDemo/tree/master/sb-jdbc-multidb-atomikos

https://gitee.com/MrCoderStack/SpringBootDemo/tree/master/sb-jdbc-multidb-atomikos

注意点

请一定注意，两张表为innodb引擎，若出现分布式事务无法触发，请优先查看表引擎。

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转载于:https://my.oschina.net/u/3066875/blog/3055188