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21-Jan-2018 11:21

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Ticket sales websites, which lock a particular seating location for short period while the user completes the order process, is an example of pessimistic concurrency control.Optimistic concurrency control works by ensuring that the record being updated or deleted has the same values as it did when the updating or deleting process started.Un detalle de este método es que luego de despegar el mensaje el botón realiza el postaback de la pagina invocando los eventos del mismo.: Este no define el evento en el html del control, sino que es en el evento Form_Load que se asigna haciendo uso de la colección Attributes.Introducción En este articulo analizaremos algunas alternativas utilizadas para trabajar con alertas o pedir confirmación, mediante cuadros de mensaje en un proyecto web.El uso de javascript en un desarrollo web con puede no ser tan simple como uno imagina, pues este código es ejecutado en el cliente, mientras que código se encuentra en el servidor.For example, when clicking the Edit button in an editable Grid View, the record's values are read from the database and displayed in Text Boxes and other Web controls. Later, after the user makes her changes and clicks the Update button, the original values plus the new values are sent to the Business Logic Layer, and then down to the Data Access Layer.The Data Access Layer must issue a SQL statement that will only update the record if the original values that the user started editing are identical to the values still in the database. Figure 2: For the Update or Delete to Succeed, the Original Values Must Be Equal to the Current Database Values (Click to view full-size image) There are various approaches to implementing optimistic concurrency (see Peter A.

Both click the Edit button in the Grid View around the same time.Jisun changes the product name to "Chai Tea" and clicks the Update button. At this point in time, the database has the values "Chai Tea," the category Beverages, the supplier Exotic Liquids, and so on for this particular product.



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