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Create a DataAdapter using the Toolbox
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Create a DataAdapter in code
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5:
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Transaction Processing in ADO.NET
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Overview
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In this chapter, you'll learn how to: Create a transaction Create a nested transaction Commit a transaction Rollback a transaction
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In the last few chapters, we've seen how ADO.NET data provider objects interact in the process of editing and updating. In this chapter, we'll complete our examination of data providers in ADO.NET with an exploration of transaction processing.
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Understanding Transactions
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A transaction is a series of actions that must be treated as a single unit of work either they must all succeed, or they must all fail. The classic example of a transaction is the transfer of funds from one bank account to another. To transfer the funds, an amount, say $100, is withdrawn from one account and deposited in the other. If the withdrawal were to succeed while the deposit failed, money would be lost into cyberspace. If the withdrawal were to fail and the deposit succeed, money would be invented. Clearly, if either action fails, they must both fail. ADO.NET supports transactions through the Transaction object, which is created against an open connection. Commands that are executed against the connection while the transaction is pending must be enrolled in the transaction by assigning a reference to the Transaction object to their Transaction property. Commands cannot be executed against the Connection outside the transaction while it is pending. If the transaction is committed, all of the commands that form a part of that transaction will be permanently written to the data source. If the transaction is rolled back, all of the commands will be discarded at the data source.
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Creating Transactions
The Transaction object is implemented as part of the data provider. There is a version for each of the intrinsic data providers: OleDbTransaction in the System.Data.OleDb namespace and SqlTransaction in the System.Data.SqlClient namespace. The SqlTransaction object is implemented using Microsoft SQL Server transactions creating a SqlTransaction maps directly to the BeginTransaction statement. The OleDbTransaction is implemented within OLE DB. No matter which data provider you use, you shouldn t explicitly issue BeginTransaction commands on the database. Creating New Transactions Transactions are created by calling the BeginTransaction method of the Connection object, which returns a reference to a Transaction object. BeginTransaction is overloaded, allowing an IsolationLevel to optionally be specified, as shown in Table 5-1. The Connection must be valid and open when BeginTransaction is called. Table 5-1: Connection BeginTransaction Methods Method BeginTransaction() BeginTransaction Description Begins a transaction Begins a transaction at the specified IsolationLev el
(IsolationLevel) Because SQL Server supports named transactions, the SqlClient data provider exposes two additional versions of BeginTransaction, as shown in Table 5-2. Table 5-2: Additional SQL BeginTransaction Methods Method BeginTransaction (TransactionName) Description Begins a
Table 5-2: Additional SQL BeginTransaction Methods Method Description transaction with the name specified in the TransactionN ame string Begins a transaction at the specified IsolationLevel with the name specified in the TransactionN ame string ADO Unlike ADO, the ADO.NET Commit and Rollback methods are exposed on the Transaction object, not the Command object. The optional IsolationLevel parameter to the BeginTransaction method specifies the connection s locking behavior. The possible values for IsolationLevel are shown in Table 5-3. Table 5-3: Isolation Levels Value Chaos Meaning Pending changes from more highly ranked transacti ons cannot be overwritt en Shared locks are held while the data is being read, but data can be changed before the end of the transacti on No shared locks are issued BeginTransaction (IsolationLevel, TransactionName)
ReadCommitted
ReadUncommitted
Table 5-3: Isolation Levels Value Meaning and no exclusive locks are honored RepeatableRead Exclusive locks are placed on all data used in the query A range lock is placed on the DataSet An existing isolation level cannot be determin ed
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