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But there is a huge problem with this solution (aside from the fact that this would be much better executed in the database using aggregation functions): each time you access the collection of bids, NHibernate must fetch this lazy collection from the database for each item. If the initial query returns 20 items, the entire transaction requires 1 initial select that retrieves the items plus 20 additional selects to load the bids collections of each item. This may easily result in unacceptable latency in a system that accesses the database across a network. Usually, you don t explicitly create such operations, because you should quickly see that doing so is suboptimal. But the n+1 selects problem is often hidden in more complex application logic, and you may not recognize it by looking at a single routine. The first attempt to solve this problem may be to enable batch fetching. You change your mapping for the bids collection to look like this: c# pdf 417 reader C# PDF-417 Reader SDK to read, scan PDF-417 in C#.NET class ...
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NET Barcode Scanner for PDF-417, provide free trial for .NET developers to read PDF-417 barcode in various .NET applications. With batch fetching enabled, NHibernate prefetches the next 10 items when the collection is first accessed. This reduces the problem from n+1 selects to n/10 + 1 selects. For many applications, this may be sufficient to achieve acceptable latency. On the other hand, it also means that in some other transactions, collections are fetched unnecessarily. It isn t the best you can do in terms of reducing the number of round trips to the database. A much, much better solution is to take advantage of HQL aggregation and perform the work of calculating the maximum bid on the database. Thus you avoid the problem: Notice that the field name is automatically placed in the table header of the first column as static text. An expression is added to the first column s detail row: birt pdf 417, free code 39 font for word, birt upc-a, birt report qr code, word 2013 ean 128, birt data matrix c# pdf 417 reader ByteScout Barcode Reader SDK - C# - Decode PDF417 - ByteScout
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RasterEdge C#.NET PDF 417 Barcode Reader plays a vital role in RasterEdge Barcode Add-on component, which is known for reading and scanning PDF 417 ... string query = @"select new MaxAmount( item.id, max(bid.Amount) ) from Item item join item.Bids bid" where item.Seller = :user group by item.id"; IList maxAmounts = session.CreateQuery(query) .SetEntity("user", user) .List(); Unfortunately, this isn t a complete solution to the generic issue. In general, you may need to do more complex processing on the bids than merely calculating the maximum amount. It s better to do this processing in the .NET application. You can try enabling eager fetching at the level of the mapping document: c# pdf 417 reader Reading and decoding PDF-417 barcodes stored in an image or PDF ...
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NET project; Digitally-signed PDF417 barcode reader library that is written in managed C# code; The .NET PDF417 scanner control component supports ... The outer-join attribute is available for collections and other associations. It forces NHibernate to load the association eagerly, using a SQL outer join. You may also use the fetch attribute; fetch="select" is equivalent to outer-join="false", and fetch= "join" is equivalent to outer-join="true". (Note that, as previously mentioned, HQL queries ignore the outer-join attribute; but you may be using a criteria query.) This mapping avoids the problem as far as this transaction is concerned; you re now able to load all bids in the initial select. Unfortunately, any other transaction that retrieves items using Get(), Load(), or a criteria query will also retrieve all the bids at once. Retrieving unnecessary data imposes extra load on both the database server and the application server and may also reduce the concurrency of the system, creating too many unnecessary read locks at the database level. Hence we consider eager fetching at the level of the mapping file to be almost always a bad approach. The outer-join attribute of collection mappings is arguably a misfeature of NHibernate (fortunately, it s disabled by default). Occasionally, it makes sense to enable outer-join for a <many-to-one> or <one-to-one> association (the default is auto; see section 4.4.6), but you d never do this in the case of a collection. Our recommended solution for this problem is to take advantage of NHibernate s support for runtime (code-level) declarations of association fetching strategies. The example can be implemented like this: This expression is evaluated when the report is processed and replaced with values in the Product column of the dataset you created. Expressions that place a field value into a textbox always use this syntax. If you prefer to type a field expression into a textbox directly, just place the field name between the exclamation point and the period. However, dragging and dropping is safer because it ensures proper spelling of the expression. Tip Because the field name can be used in the table header row, build your query to give columns a report-friendly name. For example, if the table column in the database is labeled vProduct, consider writing your query as follows: IList<Item> results = session.CreateCriteria(typeof(Item)) .Add( Expression.Eq("item.Seller", user) ) .SetFetchMode("Bids", FetchMode.Eager) .List<Item>(); // Make results distinct ISet<Item> distinctResults = new HashedSet<Item>(results); IList maxAmounts = new ArrayList(); foreach ( Item item in distinctResults ) { double maxAmount = 0; foreach ( Bid bid in item.Bids ) { if( maxAmount < bid.Amount ) maxAmount = bid.Amount; } maxAmounts.Add( new MaxAmount( item.Id, maxAmount ) ); } c# pdf 417 reader Best 20 NuGet pdf417 Packages - NuGet Must Haves Package
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