mysql 在执行Sping Boot 期间使用部分Http请求URL更改数据库

5m1hhzi4  于 2023-02-28  发布在  Mysql
关注(0)|答案(1)|浏览(113)

我需要改变当前使用的数据库每次有一个新的Http请求和它的名称是Http URL请求的一部分。我尝试使用以下代码，但当我调用服务，它正在执行，我不能再次调用，直到preveus一个已经完成，否则它崩溃。我注意到问题是'数据库未选定'，但我不知道如何改变数据库没有崩溃：（数据库和表必须由代码自动创建，如果还没有，所以我使用Flyway。
我需要使用用户通过请求的URL传递的名称URL模式为：.../API/v1/{db_name}/...我使用的是jdbcTemplate，但也欢迎使用JPA解决方案：）

try {
        DriverManagerDataSource dataSource = (DriverManagerDataSource) jdbcTemplate.getDataSource();

        String urlBase = env.getProperty("spring.datasource.url");
        dataSource.setUrl(urlBase);

        dataSource.setSchema(name);

         Flyway flyway = Flyway.configure()
                        .dataSource(dataSource)
                        .defaultSchema(name)
                        .load();
         flyway.migrate();
         dataSource.setUrl(urlBase+name);
         return true;
   }catch (Exception e){
            e.printStackTrace();
   }`

当我从两个不同的客户端两次调用链接时的异常：

StatementCallback; uncategorized SQLException for SQL [INSERT INTO statistiche_plu_giornaliere (id, id_dbLocale, idDevice, id_plu, descrizione, importo_totale, qta_totale_plu, qta_reso_storno, qta_reale, data, importo_sconti, importo_maggiorazioni, importo_reale, resi, id_reparto, tipo_riga)  VALUES (0,256,'0AB1115556633569',0,'1LT PROSECCO',24.000000,2.000000,0.000000,2.000000,'',0.000000,0.000000,24.000000,0.000000,0,0)]; SQL state [3D000]; error code [1046]; No database selected; nested exception is java.sql.SQLException: No database selected
    at org.springframework.jdbc.core.JdbcTemplate.translateException(JdbcTemplate.java:1542)
    at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:393)
    at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:558)
    at com.trei.statistiche_cloud.db.DbHandler.updateStatisticheGiornaliere(DbHandler.java:119)
    at com.trei.statistiche_cloud.http.RestController.aggiornaDb(RestController.java:49)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:568)
    at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205)
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:150)
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:117)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808)
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1071)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:964)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:696)
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:779)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
    at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:214)
    at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:186)
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:354)
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:267)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
    at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
    at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
    at org.springframework.session.web.http.SessionRepositoryFilter.doFilterInternal(SessionRepositoryFilter.java:142)
    at org.springframework.session.web.http.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:82)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:177)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:360)
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:399)
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:891)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1784)
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)
    at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.base/java.lang.Thread.run(Thread.java:833)
Caused by: java.sql.SQLException: No database selected
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:129)
    at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:122)
    at com.mysql.cj.jdbc.StatementImpl.executeUpdateInternal(StatementImpl.java:1334)
    at com.mysql.cj.jdbc.StatementImpl.executeLargeUpdate(StatementImpl.java:2084)
    at com.mysql.cj.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1245)
    at org.springframework.jdbc.core.JdbcTemplate$1UpdateStatementCallback.doInStatement(JdbcTemplate.java:546)
    at org.springframework.jdbc.core.JdbcTemplate$1UpdateStatementCallback.doInStatement(JdbcTemplate.java:543)
    at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:381)`
mysql

1条答案

按热度按时间
3pvhb19x

3pvhb19x1#

我认为您的用例非常危险，因为您基本上是通过HTTP/s调用提供数据库的秘密，其他不便之处包括：
1.为每个请求装载一个数据库会显著增加应用程序的响应时间
1.导致可伸缩性和资源消耗方面的问题。
相反，通常建议设置您的Sping Boot 应用程序，使其在启动时立即启动数据库连接，并在程序的剩余生命周期中保持该连接打开。此策略可实现更高的可伸缩性和更快的数据库访问速度。
如果需要为同一应用程序配置多个数据库，可以手动定义多个数据源。每次请求时，都可以选择要查询的数据库

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