private static void Main()
{
Console.WriteLine("Sample app for concurrent mongodb context by @mkennedy");
var ctx = new DataContext("SampleDriverDb");
if (!ctx.Books.Any())
{
Console.WriteLine("Adding sample data.");
LoadData();
}
Book book = ctx.Books.OrderBy(b => b._id).First();
Console.WriteLine("Let's edit this book: " + book.Name);
Console.Write("Enter a new title for the first book: ");
book.Name = Console.ReadLine();
Console.Write("Do you want to simulate an edit in between? [Y/N] ");
string edit = (Console.ReadLine() ?? "n").Trim().ToLower();
if (edit == "y")
{
// imagine this ran in another app or page request in parallel.
Book bookEdited = ctx.Books.OrderBy(b => b._id).First();
bookEdited.PageCount++;
ctx.Save(bookEdited);
}
var saveMode = ConcurrentSaveOptions.ProtectServerChanges;
if (edit == "y")
{
Console.Write("Do you want to save in 'protect server changes mode' or 'overwrite mode'? [P/O] ");
string writeMode = (Console.ReadLine() ?? "p").Trim().ToLower();
saveMode = writeMode == "o"
? ConcurrentSaveOptions.OverwriteServerChanges
: ConcurrentSaveOptions.ProtectServerChanges;
}
Console.WriteLine("Saving your edits...");
Console.WriteLine("Saving with mode: " + saveMode);
try
{
// simple save - protects server changes: ctx.Save(book);
ctx.Save(book, saveMode); // pass the save mode so users can test both outcomes.
Console.WriteLine("Save successful.");
}
catch (Exception x)
{
Console.WriteLine("Save error: " + x);
}
}
public static void LoadData()
{
var ctx = new DataContext("SampleDriverDb");
Book[] books =
{
new Book {Name = "Book 1", PageCount = 100},
new Book {Name = "Book 2", PageCount = 200},
new Book {Name = "Book 3", PageCount = 300},
new Book {Name = "Book 4", PageCount = 400}
};
foreach (Book book in books)
{
ctx.Save(book);
}
}
