Springboot实现根据用户ID切换动态数据源 Springboot实现根据用户ID切换动

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: 200template: 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

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然后添加拦截器

@Overridepublic 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); } @Beanpublic 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); @Autowiredprivate MyDynamicDataSource dynamicDataSource; @Autowiredprivate DynamicDataSourceCache dynamicDataSourceCache; @Autowiredprivate DynamicDataSourceService dynamicDataSourceService; @Overridepublic 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.Driverpool:#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

【Springboot实现根据用户ID切换动态数据源】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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