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在实际开发中，我们一个项目可能会用到多个数据库，通常一个数据库对应一个数据源。这时候就要管理多数据源事务。
什么是jta：https://www.ibm.com/developerworks/cn/java/j-lo-jta/
pom.xml
注意这里的druid用1.1.9
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<dependency>
-
<groupId>org.springframework.boot
</groupId>
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<artifactId>spring-boot-starter
</artifactId>
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</dependency>
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<dependency>
-
<groupId>org.springframework.boot
</groupId>
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<artifactId>spring-boot-starter-web
</artifactId>
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</dependency>
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<dependency>
-
<groupId>org.springframework.boot
</groupId>
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<artifactId>spring-boot-starter-test
</artifactId>
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<scope>test
</scope>
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</dependency>
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<dependency>
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<groupId>org.mybatis.spring.boot
</groupId>
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<artifactId>mybatis-spring-boot-starter
</artifactId>
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<version>1.1.1
</version>
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</dependency>
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<dependency>
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<groupId>mysql
</groupId>
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<artifactId>mysql-connector-java
</artifactId>
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</dependency>
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<dependency>
-
<groupId>com.alibaba
</groupId>
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<artifactId>druid
</artifactId>
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<version>1.1.9
</version>
-
</dependency>
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<!-- JPA -->
-
<dependency>
-
<groupId>org.springframework.boot
</groupId>
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<artifactId>spring-boot-starter-data-jpa
</artifactId>
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</dependency>
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<dependency>
-
<groupId>org.springframework.boot
</groupId>
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<artifactId>spring-boot-starter-jta-atomikos
</artifactId>
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</dependency>
配置第一个数据源
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import com.alibaba.druid.pool.xa.DruidXADataSource;
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import com.atomikos.icatch.jta.UserTransactionImp;
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import com.atomikos.icatch.jta.UserTransactionManager;
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import org.apache.ibatis.session.SqlSessionFactory;
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import org.mybatis.spring.SqlSessionFactoryBean;
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import org.mybatis.spring.
annotation.MapperScan;
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import org.springframework.beans.factory.
annotation.Qualifier;
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import org.springframework.boot.jta.atomikos.AtomikosDataSourceBean;
-
import org.springframework.context.
annotation.Bean;
-
import org.springframework.context.
annotation.Configuration;
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import org.springframework.context.
annotation.Primary;
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import org.springframework.transaction.jta.JtaTransactionManager;
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import javax.sql.DataSource;
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import javax.transaction.UserTransaction;
-
-
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@Configuration
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// // 扫描 Mapper 接口并容器管理
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@MapperScan(value ="mapper所在包路径" ,sqlSessionFactoryRef = "moviesSqlSessionFactory")
-
public
class MoviesDataSourceConfig {
-
-
-
@Bean(name = "moviesDataSource")
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@Primary
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public DataSource masterDataSource() {
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DruidXADataSource druidXADataSource = new DruidXADataSource();
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druidXADataSource.setUrl(
"jdbc:mysql://localhost:3306/movies?useUnicode=true&characterEncoding=UTF8&useSSL=false");
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druidXADataSource.setUsername(
"root");
-
druidXADataSource.setPassword(
"");
-
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AtomikosDataSourceBean atomikosDataSourceBean = new AtomikosDataSourceBean();
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atomikosDataSourceBean.setXaDataSource(druidXADataSource);
-
atomikosDataSourceBean.setUniqueResourceName(
"moviesDataSource");
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atomikosDataSourceBean.setPoolSize(
5);
-
-
return atomikosDataSourceBean;
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}
-
-
/*
-
* 使用这个来做总事务 后面的数据源就不用设置事务了
-
* */
-
@Bean(name = "transactionManager")
-
@Primary
-
public JtaTransactionManager regTransactionManager () {
-
UserTransactionManager userTransactionManager = new UserTransactionManager();
-
UserTransaction userTransaction = new UserTransactionImp();
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return new JtaTransactionManager(userTransaction, userTransactionManager);
-
}
-
-
@Bean(name = "moviesSqlSessionFactory")
-
@Primary
-
public SqlSessionFactory masterSqlSessionFactory(
@Qualifier("moviesDataSource") DataSource masterDataSource)
-
throws Exception {
-
final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
-
sessionFactory.setDataSource(masterDataSource);
-
return sessionFactory.getObject();
-
}
-
-
-
-
}
注意：不管有多少个数据源只要配置一个 JtaTransactionManager。
还有 DataSource里用的是DruidXADataSource ，而后注册到AtomikosDataSourceBean并且返回。
配置第二个数据源
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import com.alibaba.druid.pool.xa.DruidXADataSource;
-
-
import org.apache.ibatis.session.SqlSessionFactory;
-
import org.mybatis.spring.SqlSessionFactoryBean;
-
import org.mybatis.spring.
annotation.MapperScan;
-
import org.springframework.beans.factory.
annotation.Qualifier;
-
import org.springframework.boot.jta.atomikos.AtomikosDataSourceBean;
-
import org.springframework.context.
annotation.Bean;
-
import org.springframework.context.
annotation.Configuration;
-
-
import javax.sql.DataSource;
-
-
@Configuration
-
// // 扫描 Mapper接口
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@MapperScan(value ="com.sunsharing.mapper" ,sqlSessionFactoryRef = "teacherSqlSessionFactory")
-
public
class TeacherDataSourceConfig {
-
-
-
@Bean(name = "teacherDataSource")
-
public DataSource masterDataSource() {
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DruidXADataSource druidXADataSource = new DruidXADataSource();
-
druidXADataSource.setUrl(
"jdbc:mysql://localhost:3306/reactstu?useUnicode=true&characterEncoding=UTF8&useSSL=false");
-
druidXADataSource.setUsername(
"root");
-
druidXADataSource.setPassword(
"");
-
-
AtomikosDataSourceBean atomikosDataSourceBean = new AtomikosDataSourceBean();
-
atomikosDataSourceBean.setXaDataSource(druidXADataSource);
-
atomikosDataSourceBean.setUniqueResourceName(
"teacherDataSource");
-
atomikosDataSourceBean.setPoolSize(
5);
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return atomikosDataSourceBean;
-
}
-
-
-
@Bean(name = "teacherSqlSessionFactory")
-
public SqlSessionFactory masterSqlSessionFactory(
@Qualifier("teacherDataSource") DataSource masterDataSource)
-
throws Exception {
-
final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
-
sessionFactory.setDataSource(masterDataSource);
-
return sessionFactory.getObject();
-
}
-
-
}
这里就不用配置JtaTransactionManager了。
测试：
-
@Autowired
-
MoviesMapper moviesMapper;
-
-
@Autowired
-
TeacherMapper teacherMapper;
-
-
-
@RequestMapping(method = RequestMethod.GET)
-
public MyResponseJson twodata() {
-
for (
int i =
0;i <
5;i++) {
-
if(i <
2) {
-
Teacher teacher =
new Teacher(
"3",
10);
-
teacherMapper.insertteacher(teacher);
-
Movies movies =
new Movies(
"3",
"3",
50,
10);
-
moviesMapper.insertmovies(movies);
-
-
}
else {
-
throw
new RuntimeException();
-
}
-
}
-
return
new MyResponseJson(
200,
"成功!",
null);
-
}
测试结果：可以回滚