mybatis全注解动态数据源配置

核心jar

    org.mybatis
    mybatis
    3.2.1

    org.projectlombok
    lombok
    1.16.16

    mysql
    mysql-connector-java
    5.1.26


    com.alibaba
    druid
    1.0.12

    org.mybatis
    mybatis-spring
    1.3.1


    org.yaml
    snakeyaml
    1.17

@Configuration
@EnableTransactionManagement
public class MultiDataSource {

    @Bean
    public DynamicDataSource dynamicDataSource() {
        DynamicDataSource source = new DynamicDataSource();
        return source;
    }
    @Bean
    public SqlSessionFactoryBean sqlSessionFactoryBean(DynamicDataSource source) {

        ResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
        SqlSessionFactoryBean sqlSessionFactory = new SqlSessionFactoryBean();
        Resource[] resources ;
        try {
            resources = resolver.getResources("classpath*:META-INF/sqlmap/*Mapper.xml");
            sqlSessionFactory.setDataSource(source);
            sqlSessionFactory.setMapperLocations(resources);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return sqlSessionFactory;
    }
    @Bean
    public MapperScannerConfigurer mapperScannerConfigurer() {
        MapperScannerConfigurer configurer = new MapperScannerConfigurer();
        configurer.setBasePackage("com.fulihui.welfarecentre.dal.mapper");
        configurer.setSqlSessionFactoryBeanName("sqlSessionFactoryBean");
        return configurer;
    }
   
}

  初始化 mybatis相关配置

public class DataSourceContextHolder {

    private static final ThreadLocal contextHolder = new ThreadLocal();

    public static void setDataSource(String datasourceType){
        contextHolder.set(datasourceType);
    }

    public static String getDataSource(){
        return ((String) contextHolder.get());
    }

    public static void clear(){
        contextHolder.remove();
    }
}

  线程安全的TheadLocal来储存key

@Data
public class CustomDruidDataSource extends DruidDataSource {
    private static final long serialVersionUID = 7144084830980132474L;
    private String key;
}

 定义一个对象 继承阿里巴巴的druiDataSource

@Data
public class DataSourcesConfig {

  private List dataSource;

}

因为是多个数据源 所以又创建了一个对象 来顶一个list来接收 自定义的数据源

下面来实现 dubbo服务和 web工程拿到的传来的key

  1、 dubbo服务:

         

@Activate(group = Constants.PROVIDER)
public class DubboContextFilter implements Filter {

    private final Logger logger = LoggerFactory.getLogger(DubboContextFilter.class);

    @Override
    public Result invoke(Invoker invoker, Invocation invocation) throws RpcException {
        Object[] arguments = invocation.getArguments();
        if(arguments != null && arguments.length > 0){
            for (Object argument : arguments) {
                if(argument instanceof CommonRequest){
                    checkArgs(((CommonRequest) argument).getShowModule());
                }else if(argument instanceof CommonPageRequest){
                    checkArgs(((CommonPageRequest) argument).getShowModule());
                }
                break;
            }
        }
        return invoker.invoke(invocation);
    }

    /**
     * 参数校验
     * @param platformSource
     */
    private void checkArgs(Integer platformSource){
        logger.info("dubbo context filter: platformSource={}",platformSource);
        if(platformSource == null){
            throw new RpcException("platformSource can't be empty!");
        }
        DataSourceContextHolder.setDataSource(platformSource.toString());

    }
}

在resources目录下添加纯文本文件META-INF/dubbo/com.alibaba.dubbo.rpc.Filter，内容如下：

dubboContextFilter=xx.xx.DubboContextFilter

2:web工程

使用一个动态代理，在执行这个方法的时候，我们动态的给DataSourceContextHolder设置值，我建议使用spring aop,或者如果

不是spring的项目，那么直接只用动态代理也是很好的我觉，下面贴出核心代码

@Aspect
@Component
public class DataSourceAspect {
 
    @Pointcut("execution(* com.wang.route.DynamicPersonService.*(..))")
    public void pointCut() {
    }
 
 
    @Before(value = "pointCut()")
    public void before(JoinPoint joinPoint) {
      
           

DataSourceContextHolder.setDataSource(platformSource.toString());

}}

切换动态数据源 核心配置:

public class DynamicDataSource extends AbstractRoutingDataSource {

    @Override
    protected Object determineCurrentLookupKey() {
        String dataSource = DataSourceContextHolder.getDataSource();
        if (StringUtil.isBlank(dataSource)) {
            logger.info("determineCurrentLookupKey: dataSource not found!");
            throw new RuntimeException("determineCurrentLookupKey: dataSource not found!");
        }
        return DataSourceContextHolder.getDataSource();
    }

    @Override
    public void afterPropertiesSet() {
        DataSourcesConfig config = null;
        Yaml yaml = new Yaml();
        try {
            config = yaml.loadAs(new FileInputStream(new File("conf/dataSource.yml")), DataSourcesConfig.class);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        if (!Objects.isNull(config)) {
            Map, Object> _targetDataSources = Maps.newHashMap();
            config.getDataSource().forEach(dataSource -> {
                _targetDataSources.put(dataSource.getKey(), dataSource);
            });
            super.setTargetDataSources(_targetDataSources);
            super.afterPropertiesSet();
        }
    }
}

conf:dataSource.yml

dataSource:
 - driverClassName: com.mysql.jdbc.Driver
   url: jdbc:mysql://192.168.1.45:3306/welfare
   username: root
   password: root1234
   initialSize: 1
   minIdle: 20
   maxWait: 60000
   timeBetweenEvictionRunsMillis: 60000
   minEvictableIdleTimeMillis: 300000
   validationQuery: SELECT 'x'
   testWhileIdle: true
   testOnBorrow: false
   poolPreparedStatements: false
   maxPoolPreparedStatementPerConnectionSize: 50
   filters: stat
   defaultAutoCommit: true
   key: 0

 - driverClassName: com.mysql.jdbc.Driver
   url: jdbc:mysql://192.168.1.45:3306/welfare_1
   username: root
   password: root1234
   initialSize: 1
   minIdle: 20
   maxWait: 60000
   timeBetweenEvictionRunsMillis: 60000
   minEvictableIdleTimeMillis: 300000
   validationQuery: SELECT 'x'
   testWhileIdle: true
   testOnBorrow: false
   poolPreparedStatements: false
   maxPoolPreparedStatementPerConnectionSize: 50
   filters: stat
   defaultAutoCommit: true
   key: 1