使用druid连接池

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid-spring-boot-starter</artifactId>
    <version>1.1.10</version>
</dependency>

1、DataSourceSwitchAspect

@Component
@Order(value = -100)
@Aspect
public class DataSourceSwitchAspect {

    @Pointcut("execution(* com.yxy.datacollectionetcgantry.mapper.db2..*.*(..))")
    private void db1Aspect() {
    }

    @Pointcut("execution(* com.yxy.datacollectionetcgantry.mapper.postgre..*.*(..))")
    private void db2Aspect() {
    }

    @Pointcut("execution(* com.yxy.datacollectionetcgantry.mapper.sqlserver..*.*(..))")
    private void db3Aspect() {
    }

    @Before("db1Aspect()")
    public void db1() {
        DbContextHolder.setDbType(DBTypeEnum.db2);
    }

    @Before("db2Aspect()")
    public void db2() {
        DbContextHolder.setDbType(DBTypeEnum.postgre);
    }

    @Before("db3Aspect()")
    public void db3() {
        DbContextHolder.setDbType(DBTypeEnum.sqlserver);
    }
}

2、DbContextHolder

public class DbContextHolder {

    private static final ThreadLocal contextHolder = new ThreadLocal<>();
    /**
     * 设置数据源
     * @param dbTypeEnum
     */
    public static void setDbType(DBTypeEnum dbTypeEnum) {
        contextHolder.set(dbTypeEnum.getValue());
    }

    /**
     * 取得当前数据源
     * @return
     */
    public static String getDbType() {
        return (String) contextHolder.get();
    }

    /**
     * 清除上下文数据
     */
    public static void clearDbType() {
        contextHolder.remove();
    }
}

3、DBTypeEnum

public enum DBTypeEnum {

    db2("db2"), postgre("postgre"), sqlserver("sqlserver");
    private String value;

    DBTypeEnum(String value) {
        this.value = value;
    }

    public String getValue() {
        return value;
    }
}

4、DynamicDataSource

public class DynamicDataSource extends AbstractRoutingDataSource {

    @Override
    protected Object determineCurrentLookupKey() {
        return  DbContextHolder.getDbType();
    }
}

5、MultipleDataSourceConfig

@Configuration
public class MultipleDataSourceConfig {

    @Autowired
    private PaginationInterceptor paginationInterceptor;

    @Autowired
    private PerformanceInterceptor performanceInterceptor;

    @Bean(name = "db2")
    @ConfigurationProperties(prefix = "spring.datasource.druid.db2")
    public DataSource db2() {
        return DruidDataSourceBuilder.create().build();
    }

    @Bean(name = "postgre")
    @ConfigurationProperties(prefix = "spring.datasource.druid.postgre")
    public DataSource postgre() {
        return DruidDataSourceBuilder.create().build();
    }

    @Bean(name = "sqlserver")
    @ConfigurationProperties(prefix = "spring.datasource.druid.sqlserver")
    public DataSource sqlserver() {
        return DruidDataSourceBuilder.create().build();
    }

    /**
     * 动态数据源配置
     * @return
     */
    @Bean
    @Primary
    public DataSource multipleDataSource(@Qualifier("db2") DataSource db2,
                                         @Qualifier("postgre") DataSource postgre,
                                         @Qualifier("sqlserver") DataSource sqlserver) {
        DynamicDataSource dynamicDataSource = new DynamicDataSource();
        Map<Object, Object> targetDataSources = new HashMap<>();
        targetDataSources.put(DBTypeEnum.db2.getValue(), db2);
        targetDataSources.put(DBTypeEnum.postgre.getValue(), postgre);
        targetDataSources.put(DBTypeEnum.sqlserver.getValue(), sqlserver);
        dynamicDataSource.setTargetDataSources(targetDataSources);
        dynamicDataSource.setDefaultTargetDataSource(db2);
        return dynamicDataSource;
    }

    @Bean("sqlSessionFactory")
    public SqlSessionFactory sqlSessionFactory() throws Exception {
        MybatisSqlSessionFactoryBean sqlSessionFactory = new MybatisSqlSessionFactoryBean();
        sqlSessionFactory.setDataSource(multipleDataSource(db2(), postgre(),sqlserver()));
        sqlSessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath*:mapper/**/*.xml"));
        sqlSessionFactory.setPlugins(new Interceptor[]{paginationInterceptor,performanceInterceptor});
        return sqlSessionFactory.getObject();
    }
}