SpringBoot使用Atomikos技术整合多数据源的实现

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，如果将事务统一注册到Atomikos中，则可以统一管理。常用于后台管理系统的多数据库操作。

多数据源的划分方式

方式： a、按包名 b、按注解区分
Springboot默认集成事务,只主要在方法上加上@Transactional即可，不需要开启@EnableTransactionManagement注解
如果多个数据库，则每个方法都需要单独设置事务管理器@Transactional(transactionManager = "test2TransactionManager")，如果事务中含多数据源则无效。

Atomikos使用

1.依赖引入

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

2.多数据源配置文件

# Mysql 1
mysql.datasource.test1.url = jdbc:mysql://localhost:3306/test01?useUnicode=true&characterEncoding=utf-8
mysql.datasource.test1.username = root
mysql.datasource.test1.password = root
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 2
mysql.datasource.test2.url =jdbc:mysql://localhost:3306/test02?useUnicode=true&characterEncoding=utf-8
mysql.datasource.test2.username =root
mysql.datasource.test2.password =root
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

3.配置代码

@Data
@ConfigurationProperties(prefix = "mysql.datasource.test1")
public class DBConfig1 {
  private String 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;
}

@Data
@ConfigurationProperties(prefix = "mysql.datasource.test2")
public class DBConfig2 {
  private String 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;
}

@Configuration
// basePackages 最好分开配置 如果放在同一个文件夹可能会报错
@MapperScan(basePackages = "com.itmayiedu.test01", sqlSessionTemplateRef = "testSqlSessionTemplate")
public class MyBatisConfig1 {

  // 配置数据源
  @Primary
  @Bean(name = "testDataSource")
  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("testDataSource");

    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;
  }

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

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

@Configuration
@MapperScan(basePackages = "com.itmayiedu.test02", sqlSessionTemplateRef = "test2SqlSessionTemplate")
public class MyBatisConfig2 {

  // 配置数据源
  @Bean(name = "test2DataSource")
  public DataSource testDataSource(DBConfig2 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("test2DataSource");

    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 = "test2SqlSessionFactory")
  public SqlSessionFactory testSqlSessionFactory(@Qualifier("test2DataSource") DataSource dataSource)
      throws Exception {
    SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
    bean.setDataSource(dataSource);
    return bean.getObject();
  }

  @Bean(name = "test2SqlSessionTemplate")
  public SqlSessionTemplate testSqlSessionTemplate(
      @Qualifier("test2SqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
    return new SqlSessionTemplate(sqlSessionFactory);
  }
}

4.启动加载配置

@EnableConfigurationProperties(value = { DBConfig1.class, DBConfig2.class })
使用还是正常使用@Transactional方式

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