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\"](\"https://img.it610.com/image/info11/92f32acfd47d48419275aea68471b51e.jpg\")
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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