使用Rainbow SDK（Spring Cloud框架）

引入Rainbow SDK

1. Rainbow SDK依赖Cloud Map的注册和发现能力，在引入Rainbow SDK之前，要先引入STS SDK和Cloud Map SDK，并完成STS和Cloud Map的初始化，具体请参见使用STS SDK（Spring Cloud框架）和使用Cloud Map SDK（Spring Cloud框架）。
   

   使用Cloud Map进行数据库注册和发现时，需要先在WiseDBA管理台配置连接信息，并注册到Cloud Map中，Rainbow SDK连接数据库的过程中，直接调用Cloud Map中的注册信息，具体操作请参见新增SDK配置。

2. 引入Rainbow SDK。

   在pom.xml中添加Rainbow SDK依赖。

   <dependency>   
       <groupId>com.huawei.wisecloud.nuwa</groupId>   
       <artifactId>rainbow-proxy</artifactId>  
       <version>${rainbow-sdk-version}</version>
   </dependency>

初始化Rainbow SDK

代码如下：

package com.huawei.demo.serviceb.config;

import javax.sql.DataSource;

import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.mapper.MapperScannerConfigurer;
import org.springframework.context.EnvironmentAware;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.DependsOn;
import org.springframework.context.annotation.Import;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.Order;
import org.springframework.core.env.Environment;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.support.TransactionTemplate;

import com.huawei.nuwa.map.client.NuwaMapClient;
import com.huawei.nuwa.map.spring.boot.autoconfigure.NuwaCloudMapAutoConfiguration;
import com.huawei.rainbow.jdbc.DbGroupDataSource;
import com.huawei.wisesecurity.sts.springboot.security.configuration.StsEncryptablePropertiesConfiguration;

/**
 * Rainbow启动
 */
@Configuration
@Order(Ordered.HIGHEST_PRECEDENCE)
@Import(value = {NuwaCloudMapAutoConfiguration.class, StsEncryptablePropertiesConfiguration.class})
public class ApplicationAutoConfig implements EnvironmentAware {
    private Environment environment;

    /**
     * Rainbow需要依赖STS和Cloud Map启动，创建dataSource
     *
     * @param client NuwaMapClient值对象
     * @return DataSource 初始化完成的数据源数据源
     */
    @Bean
    @DependsOn({"stsBootStrap"})
    public DataSource createDataSource(NuwaMapClient client) {
        DbGroupDataSource dataSource = new DbGroupDataSource();
        dataSource.setUseSts(true);
        dataSource.setAppName(environment.getProperty("wiseDba.appName"));
        dataSource.setDbGroupKey(environment.getProperty("wiseDba.groupKey"));
        dataSource.setDbName(environment.getProperty("wiseDba.dbName"));
        dataSource.init();
        return dataSource;
    }

    /**
     * 事务管理创建
     *
     * @param dataSource 数据源
     * @return DataSourceTransactionManager 事务管理
     */
    @Bean
    public DataSourceTransactionManager createTransaction(DataSource dataSource) {
        DataSourceTransactionManager transaction = new DataSourceTransactionManager();
        transaction.setDataSource(dataSource);
        return transaction;
    }

    @Bean
    public JdbcTemplate createJdbcTemplate(DataSource dataSource) {
        return new JdbcTemplate(dataSource);
    }

    @Bean("sqlSessionFactoryBean")
    public SqlSessionFactoryBean createMybatisSqlSessionFactoryBean(DataSource dataSource) {
        SqlSessionFactoryBean sessionFactoryBean = new SqlSessionFactoryBean();
        sessionFactoryBean.setDataSource(dataSource);

        // 数据源配置项
        org.apache.ibatis.session.Configuration configuration = new org.apache.ibatis.session.Configuration();

        // 允许jdbc自动生成主键
        configuration.setUseGeneratedKeys(true);

        // 使用列标签代替列名
        configuration.setUseColumnLabel(true);

        // 打开下划线命名自动转换为驼峰命名开关
        configuration.setMapUnderscoreToCamelCase(true);
        sessionFactoryBean.setConfiguration(configuration);
        return sessionFactoryBean;
    }

    @Bean
    public TransactionTemplate createTransactionTemplate(DataSourceTransactionManager dataSourceTransactionManager) {
        TransactionTemplate template = new TransactionTemplate();
        template.setTransactionManager(dataSourceTransactionManager);
        return template;
    }

    @Bean
    public MapperScannerConfigurer createMapperScannerConfigurer() {
        MapperScannerConfigurer configurer = new MapperScannerConfigurer();
        configurer.setBasePackage("com.huawei.demo");
        configurer.setSqlSessionFactoryBeanName("sqlSessionFactoryBean");
        return configurer;
    }

    @Override
    public void setEnvironment(Environment environment) {
        this.environment = environment;