... optimistic concurrency , two users can request data and then subsequently update the same data . Without managing concurrency , the changes made by the first user will Handling Concurrency Issues | ❘ 185 Handling Concurrency Issues.
... Data Provider ) , provided the underlying data source sup- ports transactions and row locking ! This effectively rules out Microsoft Access and MySQL 3.23.45 . Optimistic Locking Optimistic locking , or optimistic concurrency , isn't ...
... Data and System.Data.SqlClient namespaces , add two buttons to the form , write code on the button event handlers , and make sure SQL Server is up and running . Listing 5-56 . Optimistic concurrency example void TestOptimisticConcurrency ...
... SqlDataAdapter class has built-in logic for detecting when optimistic concurrency has been violated, based on the @@ROWCOUNT SQL variable that indicates the number of affected rows when a query is executed. If the query that you execute ...
... SqlCommand object that is used for the UpdateCommand property of a SqlDataAdapter object , it's up to you to choose between two strategies for dealing with such conflicts : ➤ With optimistic concurrency control , an update to a row ...
Building Data-Driven Solutions David Talbot, Mahesh Chand. Table 4-16 . Isolation Levels Available for Transactions ... Concurrency in ADO.NET The ADO.NET model assumes that optimistic concurrency is the default concur- rency model ...
... data , 277 models , mapping to data , 133 .NET Data Providers , 191 OdbcCommand , 366 OdbcConnection ... optimistic concurrency , 318 optimizing applications ( performance and scalability ) databases , 536-537 610 objects.
... DataAdapter . That is the topic of the next section . HANDLING CONCURRENCY ISSUES WITH THE DATAADAPTER You can ... optimistic concurrency Modifies Update and Delete statements to detect whether the database has changed since the ...
Richard Mansfield. Building optimistic concurrency parameters Fortunately , VB.NET builds the necessary DataSet parameters for you to implement optimistic concurrency using the SQL or stored procedure approach . Here's how : 1. Create a ...
... Data / Resource Tier Business Tier Presentation Tier Web Client B הנו Web Client C In this hour , you will learn about the following topics : • An overview of optimistic versus pessimistic concurrency • What's happening at the data ...