Rowupdating and rowupdated how is relative dating used to evaluate geologic time

Posted by / 23-Jun-2015 17:09

In this tutorial we'll examine how to implement optimistic concurrency control.We won't look at pessimistic concurrency examples in this tutorial series.For web applications that only allow users to view data, or for those that include only a single user who can modify data, there's no threat of two concurrent users accidentally overwriting one another's changes.For web applications that allow multiple users to update or delete data, however, there's the potential for one user's modifications to clash with another concurrent user's.Enabling optimistic concurrency for a Table Adapter in the Typed Data Set augments the Table Adapter's statement, for example, updates the name and price of a product only if the current database values are equal to the values that were originally retrieved when updating the record in the Grid View. Since we are passing in the original values into the BLL, do There's one final property setting that needs to be made in order for the Object Data Source to correctly pass the original values to the BLL methods.The , that DB direct methods were those that accepts a list of scalar values as input parameters (rather than a strongly-typed Data Row or Data Table instance). The Object Data Source has a Conflict Detection property that can be assigned to one of two values: .However, the Grid View on Sam's screen still shows the product name in the editable Grid View row as "Chai".A few seconds after Jisun's changes have been committed, Sam updates the category to Condiments and clicks Update.

Figure 3: Connect to the Same Northwind Database (Click to view full-size image) Next, we are prompted as to how to query the data: through an ad-hoc SQL statement, a new stored procedure, or an existing stored procedure. For deleting, there are no new values, so only the original values need be passed in. Once the original values have been assigned to the protected void Assign All Product Values (Northwind Optimistic Concurrency. However, there are a few subtleties that will creep up and cause us problems.

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Therefore, in situations where pessimistic concurrency is used, there's typically a timeout that, if reached, cancels the lock. NET page that can utilize the optimistic concurrency logic built in to the system.

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