Databases
StackOverflow2013
Postsdbo
POHow can I retrieve a blobstore file by name
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POHow can I retrieve a blobstore file by name
    primarykey
    data
    text
    <p>I wrote the following code:</p> <pre><code> FileService fileService = FileServiceFactory .getFileService(); // Create a new Blob file with mime-type "text/plain" AppEngineFile file = fileService.createNewBlobFile( "image/jpeg", name); if(null!=file) log.warn(file.toString()); FileReadChannel readChannel = fileService.openReadChannel( file, true); // Again, different standard Java ways of reading from // the // channel. BufferedReader reader = new BufferedReader(Channels .newReader(readChannel, "UTF8")); String line = reader.readLine(); resp.setContentType("text/plain"); resp.getWriter().println(line); readChannel.close(); </code></pre> <p>But unfortunately, it gives me the following exception:</p> <blockquote> <p>Uncaught exception from servlet com.google.appengine.api.files.FinalizationException at com.google.appengine.api.files.FileServiceImpl.translateException(FileServiceImpl.java:597) at com.google.appengine.api.files.FileServiceImpl.makeSyncCall(FileServiceImpl.java:574) at com.google.appengine.api.files.FileServiceImpl.open(FileServiceImpl.java:496) at com.google.appengine.api.files.FileServiceImpl.openForRead(FileServiceImpl.java:456) at com.google.appengine.api.files.FileServiceImpl.openForRead(FileServiceImpl.java:447) at com.google.appengine.api.files.FileServiceImpl.openReadChannel(FileServiceImpl.java:202) at com.myfileshost.MyfileshostServlet.doGet(MyfileshostServlet.java:362) at javax.servlet.http.HttpServlet.service(HttpServlet.java:617) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166) at com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlobUploadFilter.java:102) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) at com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:35) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388) at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216) at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182) at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765) at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418) at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:249) at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) at org.mortbay.jetty.Server.handle(Server.java:326) at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542) at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923) at com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:76) at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404) at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:135) at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:446) at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:449) at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:455) at com.google.tracing.TraceContext.runInContext(TraceContext.java:695) at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:333) at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:325) at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:453) at com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:251) at java.lang.Thread.run(Thread.java:679)</p> </blockquote>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USSayyam
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload