C# IDatabase.Commit方法代码示例

 static void PopulateDatabase(IDatabase db, string startDir)
 {
     DatabaseRoot dbRoot = (DatabaseRoot)db.Root;
     // scan all directories starting with startDir
     var dirsToVisit = new List<string>() { startDir };
     int insertedCount = 0;
     while (dirsToVisit.Count > 0)
     {
         var dirPath = dirsToVisit[0];
         dirsToVisit.RemoveAt(0);
         // accessing directory information might fail e.g. if we
         // don't have access permissions so we'll skip all
         try
         {
             DirectoryInfo dirInfo = new DirectoryInfo(dirPath);
             foreach (var di in dirInfo.EnumerateDirectories())
             {
                 dirsToVisit.Add(di.FullName);
             }
             foreach (var fi in dirInfo.EnumerateFiles())
             {
                 var fe = new FileEntry
                 {
                     Path = fi.FullName,
                     Size = fi.Length,
                     CreationTimeUtc = fi.CreationTimeUtc,
                     LastAccessTimeUtc = fi.LastAccessTimeUtc,
                     LastWriteTimeUtc = fi.LastWriteTimeUtc
                 };
                 string name = Path.GetFileName(fe.Path);
                 dbRoot.FileSizeIndex.Put(fe.Size, fe);
                 dbRoot.FileNameIndex.Put(name, fe);
                 dbRoot.FileLastWriteTimeIndex.Put(fe.LastWriteTimeUtc, fe);
                 ++insertedCount;
                 if (insertedCount % 10000 == 0)
                 {
                     Console.WriteLine(String.Format("Inserted {0} FileEntry objects", insertedCount));
                     db.Commit();
                 }
             }
         }
         catch
         {
         }
     }
     // commit the changes if we're done creating a database
     db.Commit();
     // when we're finished, each index should have the same
     // number of items in it, equal to number of inserted objects
     Debug.Assert(dbRoot.FileSizeIndex.Count == insertedCount);
     Debug.Assert(dbRoot.FileNameIndex.Count == insertedCount);
     Debug.Assert(dbRoot.FileLastWriteTimeIndex.Count == insertedCount);
 }

 // change showMemoryStatsto true to see object stats on the console
 // before and after removal
 static void RemoveOneFileEntry(IDatabase db, DatabaseRoot dbRoot, bool showMemoryStats = false)
 {
     if (showMemoryStats)
     {
         Console.WriteLine("Memory stats before removal:");
         DumpMemoryUsage(db.GetMemoryUsage().Values);
     }
     // we pick one object and remove it from all 3 indexes
     if (dbRoot.FileSizeIndex.Count == 0)
         return;
     FileEntry toRemove = null;
     foreach (var fe in dbRoot.FileSizeIndex)
     {
         toRemove = fe;
         break;
     }
     // Remove an object with a given key from all 3 indexes.
     // We still need to provide the object because those are
     // non-unique indexes, so the same key might point to many
     // objects and we only want to remove this specific object.
     string name = Path.GetFileName(toRemove.Path);
     dbRoot.FileNameIndex.Remove(name, toRemove);
     dbRoot.FileSizeIndex.Remove(toRemove.Size, toRemove);
     dbRoot.FileLastWriteTimeIndex.Remove(toRemove.LastWriteTimeUtc, toRemove);
     // changes are not reflected in the database until we commit
     db.Commit();
     if (showMemoryStats)
     {
         Console.WriteLine("Memory stats after removal:");
         DumpMemoryUsage(db.GetMemoryUsage().Values);
     }
 }

 void MyCommit(IDatabase db, bool serializable)
 {
     if (serializable)
     {
         db.EndThreadTransaction();
         db.BeginThreadTransaction(TransactionMode.Serializable);
     }
     else
     {
         db.Commit();
     }
 }