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All database engines are supposed to provide built-in support for transactions. Transactions that are restricted to only a single resource or database are known as local transactions. Local transactions can be in one of the following four transaction modes: Autocommit Transactions Autocommit mode is the default transaction management mode of SQL Server. Every T-SQL statement is committed or rolled back when it is completed. If a statement completes successfully, it is committed; if it encounters any errors, it is bound to roll back. A SQL Server connection operates in autocommit mode whenever this default mode has not been overridden by any type transactions. Explicit Transactions Explicit transactions are those in which you explicitly control when the transaction begins and when it ends. Prior to SQL Server 2000, explicit transactions were also called user-defined or user-specified transactions. T-SQL scripts for this mode use the BEGIN TRANSACTION, COMMIT TRANSACTION, and ROLLBACK TRANSACTION statements. Explicit transaction mode lasts only for the duration of the transaction. When the transaction ends, the connection returns to the transaction mode it was in before the explicit transaction was started. Implicit Transactions When you connect to a database using SQL Server Management Studio Express and execute a DML query, the changes are automatically saved. This occurs because, by default, the connection is in autocommit transaction mode. If you want no changes to be committed unless you explicitly indicate so, you need to set the connection to implicit transaction mode. You can set the database connection to implicit transaction mode by using SET IMPLICIT _TRANSACTIONS ON|OFF. After implicit transaction mode has been set to ON for a connection, SQL Server automatically starts a transaction when it first executes any of the following statements: ALTER TABLE, CREATE, DELETE, DROP, FETCH, GRANT, INSERT, OPEN, REVOKE, SELECT, TRUNCATE TABLE, and UPDATE.

At of results returned until eventually no results are returned at all. We have to break up the assertions D into individual term assertions because there s no guarantee now that the query terms will be contiguous in the results. E shows the generated query syntax. We examine the next two queries, PrefixQuery and WildcardQuery, together because they re quite similar.

That s enough theory for now. It s time to do some coding and see how these objects work together in practice!

The PrefixQuery and WildcardQuery are very closely related. In fact the sole difference between the two query types is that a WildcardQuery can have the wildcards * and anywhere in the query terms, while a PrefixQuery ends with the wildcard character *.

Dim ds as DataSet = new DataSet() Dim ds as DataSet = new DataSet("MyDataSet")

WARNING Several of Lucene s query types, including WildcardQuery and Pre-

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The transaction remains in effect until a COMMIT or ROLLBACK statement has been explicitly issued. This means that when, say, an UPDATE statement is issued on a particular record in a database, SQL Server will maintain a lock on the data scoped for data modification until either a COMMIT or ROLLBACK is issued. In case neither of these commands is issued, the transaction will be automatically rolled back when the user disconnects. This is why it is not a best practice to use implicit transaction mode on a highly concurrent database. Batch-Scoped Transactions A connection can be in batch-scoped transaction mode, if the transaction running in it is Multiple Active Result Sets (MARS) enabled. Basically MARS has an associated batch execution environment, as it allows ADO.NET to take advantage of SQL Server 2005 s capability of having multiple active commands on a single connection object. When MARS is enabled, you can have multiple interleaved batches executing at the same time, so all the changes made to the execution environment are scoped to the specific batch until the execution of the batch is complete. Once the execution of the batch completes, the execution settings are copied to the default environment. Thus a connection is said to be using batch-scoped transaction mode if it is running a transaction, has MARS enabled on it, and has multiple batches running at the same time. MARS allows executing multiple interleaved batches of commands. However, MARS does not let you have multiple transactions on the same connection; it only allows you to have Multiple Active Result Sets.

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