Springboot实现根据用户ID切换动态数据源
作者：洛阳泰山
在很多具体应用场景中，我们需要用到动态数据源的情况，比如多租户的场景，系统登录时需要根据用户信息切换到用户对应的数据库。这篇文章主要介绍了SpringBoot根据用户ID实现切换动态数据源的示例代码，感兴趣的可以了解一下
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<String> 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
* <p>
* 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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