Springboot实现根据用户ID切换动态数据源

首先在application.yml 文件添加一下配置 

#每个库可连接最大用户数
dynamic-server:
  #每个服务最大建库数
  database-max-number: 30
  #每个库最大用户连接数
  user-max-number: 200
  template: gis_template

然后项目中添加 dynamicds 模块的代码，仅展示模块文件目录，代码太多不展示了

然后添加拦截器

 
    @Override
    public void addInterceptors(InterceptorRegistry registry){
        //排除登录注册拦截
        List patterns = new ArrayList<>();
 
        patterns.add("/doc.html");
        patterns.add("/js/**");
        patterns.add("/webjars/**");
        patterns.add("/swagger-resources/**");
        patterns.add("/unify-resource/**");
        patterns.add("/unify-auth/oauth/token");
        patterns.add("/unify-auth/register");
        patterns.add("/unify-resource/**");
        patterns.add("/rabbit/**");
        //默认数据源 不需要切换的 排除
        registry.addInterceptor(dynamicDataSourceInterceptor()).addPathPatterns("/**")
                .excludePathPatterns(patterns).order(1);
      //  registry.addInterceptor(dynamicDefaultDataSourceInterceptor()).addPathPatterns("/**").order(-1);
    }
 
    @Bean
    public DynamicDataSourceInterceptor dynamicDataSourceInterceptor(){
        return new DynamicDataSourceInterceptor();
    }

动态数据源拦截器

跟据token 获取用户id 再根据用户id切换对应数据源 

 
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springblade.core.secure.BladeUser;
import org.springblade.core.secure.utils.AuthUtil;
import org.springblade.gis.dynamicds.cache.DynamicDataSourceCache;
import org.springblade.gis.dynamicds.datasource.MyDynamicDataSource;
import org.springblade.gis.dynamicds.service.DynamicDataSourceService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.servlet.HandlerInterceptor;
 
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
/**
 * file:DynamicDataSourceInterceptor
 * 

 * 文件简要说明
 *
 * @author 2021-10-28 tarzan 创建初始版本
 * @version V1.0  简要版本说明
 */
public class DynamicDataSourceInterceptor implements HandlerInterceptor {
    private static final Logger log = LoggerFactory.getLogger(DynamicDataSourceInterceptor.class);
    @Autowired
    private MyDynamicDataSource dynamicDataSource;
    @Autowired
    private DynamicDataSourceCache dynamicDataSourceCache;
    @Autowired
    private DynamicDataSourceService dynamicDataSourceService;
 
 
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)  {
        //获取当前登录用户信息
        BladeUser user = AuthUtil.getUser();
     /*   if(user == null || user.getUserId() == null){
            throw new UnauthorizedException(ErrorEnum.E_401);
        }*/
        log.info("据源切换--------------用户名-----"+user.getUserName()+"------------>【{}】", user.getUserId());
        //如果未获取到 dsName 重新加载数据库
        if(!dynamicDataSourceCache.hasDataSourceName(user.getUserId())){
            dynamicDataSourceService.addUserDataSource(user.getUserId());
        }
        String dsName = dynamicDataSourceCache.getUserIdDataSourceName(user.getUserId());
        if(!dynamicDataSource.switchDataSource(dsName)){
            //如果切换数据源失败 返回错误
            throw new RuntimeException("未找到用户数据库");
        }
        return true;
    }
 
}

数据库设计

dynamicDataSource:
  default:
    url: jdbc:postgresql://${POSTGRES_HOST:172.16.10.201}:${POSTGRES_PORT:5432}/${POSTGRES_DATABASE:gis_db}
    username: ${POSTGRES_USERNAME:postgres}
    password: ${POSTGRES_PASSWORD:postgres}
    driverClassName: org.postgresql.Driver
    pool:
      #最小空闲连接
      minimum-idle: 2
      #最大连接
      maximum-pool-size: 3
      # 空闲连接存活最大时间，默认600000（10分钟）
      idle-timeout: 1200000
      # 据库连接超时时间,默认30秒
      connection-timeout: 300000

初始链接一个基础数据库，放置用户表，数据源表，数据库表

数据库表建表语句

CREATE TABLE "public"."data_server_database" (
  "id" int8 NOT NULL,
  "data_source_key" varchar(128) COLLATE "pg_catalog"."default" NOT NULL,
  "database_name" varchar(128) COLLATE "pg_catalog"."default" NOT NULL,
  "source_id" int8 NOT NULL,
  "create_time" timestamp(6) NOT NULL DEFAULT CURRENT_TIMESTAMP,
  "update_time" timestamp(6) NOT NULL DEFAULT CURRENT_TIMESTAMP,
  "priority" int4 NOT NULL,
  "amount" int4 NOT NULL DEFAULT 0,
  "status" int2 NOT NULL DEFAULT 2
)
;
COMMENT ON COLUMN "public"."data_server_database"."id" IS '主键';
COMMENT ON COLUMN "public"."data_server_database"."data_source_key" IS '数据源连接唯一key';
COMMENT ON COLUMN "public"."data_server_database"."database_name" IS '数据库名';
COMMENT ON COLUMN "public"."data_server_database"."source_id" IS '数据源id(data_server_source表主键id)';
COMMENT ON COLUMN "public"."data_server_database"."create_time" IS '创建时间';
COMMENT ON COLUMN "public"."data_server_database"."update_time" IS '更新时间';
COMMENT ON COLUMN "public"."data_server_database"."priority" IS '数据库使用顺序(升序)';
COMMENT ON COLUMN "public"."data_server_database"."amount" IS '数据使用用户数量';
COMMENT ON COLUMN "public"."data_server_database"."status" IS '使用状态(1:正在使用；2：本库使用用户数已满)';
COMMENT ON TABLE "public"."data_server_database" IS '用户连接的数据库配置';
 
-- ----------------------------
-- Uniques structure for table data_server_database
-- ----------------------------
ALTER TABLE "public"."data_server_database" ADD CONSTRAINT "source_key_unique" UNIQUE ("data_source_key");
COMMENT ON CONSTRAINT "source_key_unique" ON "public"."data_server_database" IS '数据源名 唯一';
 
-- ----------------------------
-- Primary Key structure for table data_server_database
-- ----------------------------
ALTER TABLE "public"."data_server_database" ADD CONSTRAINT "data_server_source_pkey" PRIMARY KEY ("id");

数据源表建表语句 

CREATE TABLE "public"."data_server_source" (
  "id" int8 NOT NULL,
  "driver_class_name" varchar(128) COLLATE "pg_catalog"."default" NOT NULL,
  "url" varchar(255) COLLATE "pg_catalog"."default" NOT NULL,
  "user_name" varchar(64) COLLATE "pg_catalog"."default" NOT NULL,
  "password" varchar(128) COLLATE "pg_catalog"."default" NOT NULL,
  "create_time" timestamp(6) NOT NULL DEFAULT CURRENT_TIMESTAMP,
  "update_time" timestamp(6) NOT NULL DEFAULT CURRENT_TIMESTAMP,
  "priority" int4,
  "amount" int4 DEFAULT 0,
  "status" int2 DEFAULT 2
)
;
COMMENT ON COLUMN "public"."data_server_source"."id" IS '主键';
COMMENT ON COLUMN "public"."data_server_source"."driver_class_name" IS '数据库驱动';
COMMENT ON COLUMN "public"."data_server_source"."url" IS '数据库连接url';
COMMENT ON COLUMN "public"."data_server_source"."user_name" IS '数据库用户名';
COMMENT ON COLUMN "public"."data_server_source"."password" IS '数据库用户密码';
COMMENT ON COLUMN "public"."data_server_source"."create_time" IS '创建时间';
COMMENT ON COLUMN "public"."data_server_source"."update_time" IS '更新时间';
COMMENT ON COLUMN "public"."data_server_source"."priority" IS '数据库服务使用顺序(升序)';
COMMENT ON COLUMN "public"."data_server_source"."amount" IS '数据服务建库数量';
COMMENT ON COLUMN "public"."data_server_source"."status" IS '使用状态(1:正在使用；2：本服务建库数已满)';
COMMENT ON TABLE "public"."data_server_source" IS '数据库服务的数据源连接表';
 
-- ----------------------------
-- Records of data_server_source
-- ----------------------------
INSERT INTO "public"."data_server_source" VALUES (2, 'org.postgresql.Driver', 'jdbc:postgresql://localhost:5432/', 'hgl', 'hgl', '2021-11-01 14:53:45', '2021-11-01 14:53:47', 2, 0, 2);
INSERT INTO "public"."data_server_source" VALUES (1, 'org.postgresql.Driver', 'jdbc:postgresql://172.16.10.201:5432/', 'postgres', 'postgres', '2021-11-01 14:53:45', '2021-11-01 14:53:47', 1, 3, 1);
INSERT INTO "public"."data_server_source" VALUES (5, 'org.postgresql.Driver', 'jdbc:postgresql://172.16.10.6:5432/', 'hgl', 'hgl', '2021-11-01 14:54:12', '2021-11-01 14:54:14', 10, 0, 2);
INSERT INTO "public"."data_server_source" VALUES (10, 'org.postgresql.Driver', 'jdbc:postgresql://172.16.10.72:5432,172.16.10.73:5432/', 'postgres', 'pgpg', '2021-11-01 14:54:12', '2021-11-01 14:54:14', 10, 0, 2);
 
-- ----------------------------
-- Primary Key structure for table data_server_source
-- ----------------------------
ALTER TABLE "public"."data_server_source" ADD CONSTRAINT "data_server_source_pkey1" PRIMARY KEY ("id");

用户表 省略，就是常规用户表，加上 数据库id外键即可

注册用户时，

调用DynamicDataSourceService类的getDatabaseId() 方法，将用户和数据库绑定。

      entity.setDatabaseId(dataSourceService.getDatabaseId());

getDatabaseId() 讲解 根据配置的数据库最大用户数配置，方法内部判断当前数据库用户数是否大于配置用户，没有则返回当前数据库id,有则返回下一个数据库id

使用方法，调用接口时候，传入token ，动态数据库拦截器，自动获取用户id,切换对应数据源。 

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