springboot jta atomikos实现分布式事物管理

这篇文章主要介绍了springboot jta atomikos实现分布式事物管理,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下

当项目在连接多个数据库时可能会发生事务问题，即一个库的事务不可能去操作另一个数据库的事务，这时就需要使用atomikos对数据库的事务进行统一的管理

第一步添加atomikos的依赖

<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-jta-atomikos</artifactId>
</dependency>

第二步配置数据源，我这里有2个数据库(ruan和youxianqi)，你有多少就加多少。

spring:
 datasource:
  system:
   jdbc-url: jdbc:oracle:thin:@localhost:1521/orcl
   driver-class-name: oracle.jdbc.OracleDriver
   username: yuan
   password: 1234
   initial-size: 5
   min-idle: 5
   max-active: 20
   min-evictable-idle-time-millis: 300000
   validation-query: SELECT 1 FROM DUAL
   test-while-idle: true
  kllogt:
   jdbc-url: jdbc:oracle:thin:@localhost:1521/orcl
   driver-class-name: oracle.jdbc.OracleDriver
   username: youxianqi
   password: youxianqi
   initial-size: 5
   min-idle: 5
   max-active: 20
   min-evictable-idle-time-millis: 300000
   validation-query: SELECT 1 FROM DUAL
   test-while-idle: true
logging:
 level:
  org.springframework.web: debug

然后创建DBConfig1和DBConfig2，这两个实体类就是存放两个数据源的数据的。

package com.cgb.config;

import org.springframework.boot.context.properties.ConfigurationProperties;

@ConfigurationProperties(prefix = "spring.datasource.system")
public class DBConfig1 {

  private String jdbc-url;
  private String username;
  private String password;

  private int minPoolSize;

  private int maxPoolSize;

  private int maxLifetime;

  private int borrowConnectionTimeout;

  private int loginTimeout;

  private int maintenanceInterval;

  private int maxIdleTime;

  private String testQuery;

  public String getJdbc-url() {
    return url;
  }

  public void setJdbc-url(String jdbc-url) {
    this.jdbc-url= jdbc-url;
  }

  public String getUsername() {
    return username;
  }

  public void setUsername(String username) {
    this.username = username;
  }

  public String getPassword() {
    return password;
  }

  public void setPassword(String password) {
    this.password = password;
  }

  public int getMinPoolSize() {
    return minPoolSize;
  }

  public void setMinPoolSize(int minPoolSize) {
    this.minPoolSize = minPoolSize;
  }

  public int getMaxPoolSize() {
    return maxPoolSize;
  }

  public void setMaxPoolSize(int maxPoolSize) {
    this.maxPoolSize = maxPoolSize;
  }

  public int getMaxLifetime() {
    return maxLifetime;
  }

  public void setMaxLifetime(int maxLifetime) {
    this.maxLifetime = maxLifetime;
  }

  public int getBorrowConnectionTimeout() {
    return borrowConnectionTimeout;
  }

  public void setBorrowConnectionTimeout(int borrowConnectionTimeout) {
    this.borrowConnectionTimeout = borrowConnectionTimeout;
  }

  public int getLoginTimeout() {
    return loginTimeout;
  }

  public void setLoginTimeout(int loginTimeout) {
    this.loginTimeout = loginTimeout;
  }

  public int getMaintenanceInterval() {
    return maintenanceInterval;
  }

  public void setMaintenanceInterval(int maintenanceInterval) {
    this.maintenanceInterval = maintenanceInterval;
  }

  public int getMaxIdleTime() {
    return maxIdleTime;
  }

  public void setMaxIdleTime(int maxIdleTime) {
    this.maxIdleTime = maxIdleTime;
  }

  public String getTestQuery() {
    return testQuery;
  }

  public void setTestQuery(String testQuery) {
    this.testQuery = testQuery;
  }

}

然后创建两个数据源RuanMyBatisConfig和YouMyBatisConfig，注意@Primary注解只能有一个。

package com.cgb.datasource;

import java.sql.SQLException;

import javax.sql.DataSource;

import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.SqlSessionTemplate;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import com.atomikos.jdbc.AtomikosDataSourceBean;
import com.cgb.config.DBConfig1;
import com.mysql.jdbc.jdbc2.optional.MysqlXADataSource;

@Configuration
@MapperScan(basePackages = "com.cgb.ruan",sqlSessionTemplateRef = "testSqlSessionTemplate")
public class RuanMyBatisConfig {

  // 配置数据源
  @Primary
  @Bean(name = "dataSource1")
  public DataSource testDataSource(DBConfig1 testConfig) throws SQLException {
    MysqlXADataSource mysqlXaDataSource = new MysqlXADataSource();
    mysqlXaDataSource.setUrl(testConfig.getUrl());
    mysqlXaDataSource.setPinGlobalTxToPhysicalConnection(true);
    mysqlXaDataSource.setPassword(testConfig.getPassword());
    mysqlXaDataSource.setUser(testConfig.getUsername());
    mysqlXaDataSource.setPinGlobalTxToPhysicalConnection(true);

    AtomikosDataSourceBean xaDataSource = new AtomikosDataSourceBean();
    xaDataSource.setXaDataSource(mysqlXaDataSource);
    xaDataSource.setUniqueResourceName("dataSource1");

    xaDataSource.setMinPoolSize(testConfig.getMinPoolSize());
    xaDataSource.setMaxPoolSize(testConfig.getMaxPoolSize());
    xaDataSource.setMaxLifetime(testConfig.getMaxLifetime());
    xaDataSource.setBorrowConnectionTimeout(testConfig.getBorrowConnectionTimeout());
    xaDataSource.setLoginTimeout(testConfig.getLoginTimeout());
    xaDataSource.setMaintenanceInterval(testConfig.getMaintenanceInterval());
    xaDataSource.setMaxIdleTime(testConfig.getMaxIdleTime());
    xaDataSource.setTestQuery(testConfig.getTestQuery());
    return xaDataSource;
  }

  @Bean(name = "testSqlSessionFactory")
  public SqlSessionFactory testSqlSessionFactory(@Qualifier("dataSource1") DataSource dataSource)
      throws Exception {
    SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
    bean.setDataSource(dataSource);
    return bean.getObject();
  }

  @Bean(name = "testSqlSessionTemplate")
  public SqlSessionTemplate testSqlSessionTemplate(
      @Qualifier("testSqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
    return new SqlSessionTemplate(sqlSessionFactory);
  }
}

其实在多个数据源的时候，我们怎么去指定数据库呢？

其中一个做法是写注解，表明使用哪个数据库，但是这种是不是很麻烦。最好的做法是分包管理：

好啦，大功告成，我们来看看效果吧。

我们发现控制台打印添加学生成功，好我们看看数据库里有没有数据呢？

毫无疑问是没有的，说明事务起作用了。那我们把那行异常代码注释掉，再看看效果。成功了，去看看数据库有没有呢。

ojbk，想想同时操作多个数据库，是不是很爽啊，哈哈哈。

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