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You mark the class mutable="false" because AuditLogRecords are immutable. NHibernate will no longer update the record, even if you try to. The audit-logging concern is somewhat orthogonal to the business logic that causes the log-able event. It s possible to mix logic for audit logging with the business logic; but in many applications it s preferable for audit logging to be handled in a central piece of code, transparently to the business logic. You wouldn t manually create a new AuditLogRecord and save it whenever an Item was modified. NHibernate offers an extension point so you can plug in an audit-log routine or any similar event listener. This extension is known as an NHibernate IInterceptor.

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Using this .NET barcode reader control, you can easily detect and decode all QR Code barcodes from loaded image file using C# code . Supported image file formats are png, jpeg, bmp, tiff and gif. The sample C# code below can help you detect all QR Code barcodes from png and return the decoding values to data string.

You d prefer that a LogEvent() method be called automatically when you call Save(). The best way to do this with NHibernate is to implement the IInterceptor interface, as shown in listing 8.2.

Do this Right-click on a textbox (such as a table header), select Properties, click the Interactive Sort tab, and then select the Add An Interactive Sort Action To This Textbox check box. Click the table to display the row handles. Right-click a row, and then click Insert Group. Change the name of the group, if desired, and select one or more expressions from the list box to use for grouping detail rows. Copy an expression that returns a numeric value from the table footer and paste into a group header or group footer row. or Type an aggregate expression in a group header or group footer cell. For example, to compute a subtotal: =Sum(Fields!SalesAmount.Value).

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A library which supports decoding and generating of barcodes (like QR Code, PDF 417, EAN, UPC, Aztec, Data Matrix, Codabar) within images. The project is a port of the java based barcode reader and generator library ZXing. It has been ported by hand with a lot of optimizations and improvements.

public class AuditLogInterceptor : NHibernate.Cfg.EmptyInterceptor { private ISession session; private long userId; Collections to keep new private ISet inserts = new HashedSet(); and modified entities private ISet updates = new HashedSet(); public ISession Session { get { return this.session; } Opened session set { this.session = value; } must be provided } public long UserId { get { return this.userId; } Required for set { this.userId = value; } AuditLogRecord } public virtual bool OnSave(object entity, Collects new object id, entities object[] state, string[] propertyNames, IType[] types) { if ( entity.GetType().GetCustomAttributes(

typeof(AuditableAttribute), false).Length > 0 ) inserts.Add(entity); return base.OnSave(entity, id, state, propertyNames, types);

} public virtual bool OnFlushDirty(object entity, Collects object id, modified object[] currentState, entities object[] previousState, string[] propertyNames, IType[] types) { if ( entity.GetType().GetCustomAttributes( typeof(AuditableAttribute), false).Length > 0 ) updates.Add(entity); return base.OnFlushDirty(entity, id, currentState, previousState, propertyNames, types); } public virtual void PostFlush(System.Collections.ICollection c) { try { foreach(object entity in inserts) { Log process AuditLog.LogEvent(LogType.Create, entity, userId, session.Connection); } foreach(object entity in updates) { AuditLog.LogEvent(LogType.Update, entity, userId, session.Connection); } } catch (HibernateException ex) { throw new CallbackException(ex); } finally { inserts.Clear(); updates.Clear(); } } }

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Apr 18, 2017 · In this video you will learn how to make your very own QR code scanner by webcam in VB.NET ...Duration: 10:52 Posted: Apr 18, 2017

Once you have data for your report, you often need to perform additional calculations using this data to derive values that aren t stored in the database For example, you might need to include the product margin in the report The margin is the difference between the amount for which the product sold and the cost of making or acquiring it Even though margin isn t stored as a value in the database, it can be derived from other values that are stored in the database by building an expression that subtracts CostAmount from SalesAmount An expression can be added as a calculated field to the dataset, and then used in a table as if it were part of the original dataset Not all expressions are based on fields in the dataset.

Instead of directly implementing the IInterceptor interface, you inherit from EmptyInterceptor, which allows you to ignore the methods of this interface that you don t need. This particular interceptor has two interesting aspects. First, the session and userId are fields this interceptor needs to do its work, so a client using this interceptor must set both properties when enabling the interceptor. The other interesting aspect is the audit-log routine in OnSave() and OnFlushDirty(), where you add new and updated entities to collections. The OnSave() interceptor method is called whenever NHibernate saves an entity; the OnFlushDirty() method is called whenever NHibernate detects a dirty object. The audit logging is done in the PostFlush() method, which NHibernate calls after executing the synchronization SQL. Note that entity.GetType().GetCustomAttributes() performs badly (compared to using IAuditable), but you can optimize this code by caching all the decorated types.

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