Springboot实现根据用户ID切换动态数据源

发布时间:2023-07-04 19:00

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

\"Springboot实现根据用户ID切换动态数据源_第1张图片\"

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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