每次有新的 Http 请求时，我都需要更改当前使用的数据库，并且其名称是 Http URL 请求的一部分。 我正在尝试使用以下代码，但是当我调用该服务并且它正在执行时，在前一个服务完成之前我无法再次调用，否则它会崩溃。 我注意到问题是“未选择数据库”，但我不知道如何更改数据库而不崩溃:( 如果还没有，则必须通过代码自动创建数据库和表，因此我使用 Flyway。
我需要使用通过请求的 url 从用户传递的名称 网址模式是： .../api/v1/{db_name}/... 我正在使用 jdbcTemplate，但欢迎使用 JPA 解决方案:)
1
819try {
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调用链接两次时出现异常：
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)` 
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我认为你的用例非常危险，因为你基本上是通过 HTTP/s 调用提供数据库的秘密，其他不便之处包括：
为每个请求加载数据库将显着增加应用程序的响应时间
导致可扩展性和资源消耗问题。
相反，通常建议将 Spring Boot 应用程序设置为在启动后立即启动数据库连接，并在程序的剩余生命周期中保持其打开状态。此策略可实现更高的可扩展性和更快的数据库访问速度。
如果需要为同一个应用程序配置多个数据库，您可以手动定义多个数据源。根据每个请求，您可以选择要查询的数据库