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the ISessionFactory referred to by sessionFactory, and then you start a new database transaction. A call to Save() makes the transient instance of User persistent. It s now associated with the current ISession. But no SQL INSERT has yet been executed; the NHibernate ISession never executes any SQL statement until absolutely necessary. The changes made to persistent objects must be synchronized with the database at some point. This happens when you Commit() the NHibernate ITransaction. In this case, NHibernate obtains an ADO.NET connection (and transaction) and issues a single SQL INSERT statement. Finally, the ISession is closed, and the ADO.NET connection is released. Note that it s better (but not required) to fully initialize the User instance before associating it with the ISession. The SQL INSERT statement contains the values that were held by the object at the point when Save() was called. You can, of course, modify the object after calling Save(), and your changes will be propagated to the database as a SQL UPDATE. Everything between session.BeginTransaction() and Transaction.Commit() occurs in one database transaction. We haven t discussed transactions in detail yet; we leave that topic for the next chapter. But keep in mind that all database operations in a transaction scope are atomic they completely succeed or completely fail. If one of the UPDATE or INSERT statements made on Transaction.Commit() fails, all changes made to persistent objects in this transaction will be rolled back at the database level. But NHibernate does not roll back in-memory changes to persistent objects; their state remains exactly as you left it. This is reasonable because a failure of a database transaction is normally non-recoverable, and you have to discard the failed ISession immediately. 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. As explained earlier in this chapter, the expected syntax of the command text for this implementation is StartNode; field1, field2, ..fieldN. For example, the Purchase Order Details.xml file, located at C:\Documents and Settings\<username>\My Documents\Microsoft Press\rs2005sbs\chap16, that will be used to test this extension Modifying the user after the session is closed has no effect on its persistent representation in the database. When the session is closed, user becomes a detached instance. But it may be reassociated with a new Session some time later by calling Update() or Lock(). Let s first look at the Update() method. Using Update() forces an update to the persistent state of the object in the database; a SQL UPDATE is scheduled and will be later committed. Here s an example of detached object handling: user.Password = "secret"; using( ISession sessionTwo = sessionFactory.OpenSession() ) using( sessionTwo.BeginTransaction() ) { sessionTwo.Update(user); user.Username = "jonny"; sessionTwo.Transaction.Commit(); } birt data matrix, word aflame upc, birt code 39, birt upc-a, word ean 13 barcode font, ean 128 word 2007 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 ... It doesn t matter if the object is modified before or after it s passed to Update(). The important thing is that the call to Update() is used to reassociate the detached instance with the new ISession and the current transaction. NHibernate will treat the object as Part V: dirty and therefore schedule the SQL UPDATE regardless of whether the object has been updated. This makes Update() a safe way to reassociate objects with a Session, because you know changes will be propagated to the database. There is one exception: when you ve enabled select-before-update in the persistent class mapping. With this option enabled, a call to Update() will make NHibernate determine whether the object is dirty rather than assuming it is. It does so by executing a SELECT statement and comparing the object s current state to the current database state. This is still a safe option, even though NHibernate won t force an update if it isn t needed. Now, let s look a the Lock() method. A call to Lock() associates the object with the ISession without forcing NHibernate to treat the object as dirty. Consider this example: c# pdf 417 reader Reading and decoding PDF-417 barcodes stored in an image or PDF ...
Haven't used this component of theirs, but have a look it is C#, and you can ... NET is probably the easiest way to decode PDF 417 and many ... c# pdf 417 reader .NET PDF417 Barcode Reader Control | How to Decode PDF417 ...
NET project; Digitally-signed PDF417 barcode reader library that is written in managed C# code; The .NET PDF417 scanner control component supports ... using( ISession sessionTwo = sessionFactory.OpenSession() ){ using( sessionTwo.BeginTransaction() ) { sessionTwo.Lock(user, LockMode.None); user.Password = "secret"; user.LoginName = "jonny"; sessionTwo.Transaction.Commit(); } } contains purchase order information where the most detailed data is the line item information that includes product, quantity, and price information. This information is contained on the <item> node, so the StartNode for this query includes the full node path from the root node to the <item> node. The structure of the XML file looks like this: c# pdf 417 reader Best 20 NuGet pdf417 Packages - NuGet Must Haves Package
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