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Composite Transact-SQL Constructs Batches, Scripts, and Transactions
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In this case, SQL Server deleted records one after the other from the EqType table until it encountered a record that could not be deleted because of the foreign key relationship, at which point the operation was canceled.
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The most popular and obvious way to use transactions is to give explicit commands to start or finish the transaction. Transactions started in this way are called explicit transactions. Developers can group two or more Transact-SQL statements into a single transaction using the following statements:
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Begin Transaction Rollback Transaction Commit Transaction
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If anything goes wrong with any of the grouped statements, all changes need to be aborted. The process of reversing changes is called rollback in SQL Server terminology. If everything is in order with all statements within a single transaction, all changes are recorded together in the database. In SQL Server terminology, we say that these changes are committed to the database. We will demonstrate the use of these processes on the prClearLeaseSchedule stored procedure. Its main purpose is to set monthly lease amounts to zero for each asset associated with an expired lease schedule. It also sets the total of the lease amounts to zero. These two suboperations must be performed simultaneously to preserve the integrity of the database.
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Create Procedure prClearLeaseShedule -- Set value of Lease of all equipment -- associated with expired Lease Schedule to 0. -- Set total amount of Lease Schedule to 0. @intLeaseScheduleId int As
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SQL Server 2000 Stored Procedure Programming
Begin Transaction
-- Set value of Lease of all equipment -- associated with expired Lease Schedule to 0 Update Inventory Set Lease = 0 Where LeaseScheduleId = @intLeaseScheduleId If @@Error <> 0 goto PROBLEM
-- Set total amount of Lease Schedule to 0 Update LeaseSchedule Set PeriodicTotalAmount = 0 Where ScheduleId = @intLeaseScheduleId If @@Error <> 0 goto PROBLEM Commit Transaction Return 0 PROBLEM: Print ' Unable to eliminate lease amounts from the database!' Rollback Transaction Return 1
Before the real processing starts, the Begin Transaction statement notifies SQL Server to treat all of the following actions as a single transaction. It is followed by two Update statements. If no errors occur during the updates, all changes are committed to the database when SQL Server processes the Commit Transaction statement, and finally the stored procedure finishes. If an error occurs during the updates, it is detected by if statements and execution is continued from the PROBLEM label. After displaying a message to the user, SQL Server rolls back any changes that occurred during processing.
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Implicit Transactions
The third transaction mode is called the implicit transaction. To use this mode, you set a connection using the Set Implicit_Transactions On statement. Any of the following statements will serve as an implicit start to a transaction:
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Alter Table Create Delete Drop Fetch Grant Insert Open Revoke Select Truncate Table Update
To finish the transaction, a developer must use the Commit Transaction or Rollback Transaction statement. After that, any of the specified commands will start another transaction.
Transaction Processing Architecture
An explanation of how transactions are implemented in Microsoft SQL Server will give you some insight into many processes. Every change to the database is recorded in a transaction log before it is written to the appropriate tables. In SQL Server 2000 and SQL Server 7.0, transaction logs are implemented in separate files (or a set of files) with the extension .ldf. All modifications are written to this file chronologically. The records in this transaction log can later be used to roll back the transaction (thus providing Atomicity), or to
SQL Server 2000 Stored Procedure Programming
commit the changes to the database (thus providing Durability). Two types of records can be stored in transaction logs:
Logical operations performed (for instance, insert, delete, start of transaction) Before and after images of the changed data (that is, copies of data before and after the change is made)
The transaction log mechanism helps to resolve many issues:
If a client application loses its connection before a transaction is finished, SQL Server will detect a problem and roll back changes (thus providing Consistency). If the machine loses power during processing, SQL Server will recover the database when services are restored. All transactions that were recorded in the transaction log in an undivided manner (that is, as part of a complete transaction set) are rolled forward (written to data tables) as if nothing unusual has happened (Durability). All transactions that were not completed before the problem occurred are rolled back (deleted) from the database.
The transaction log plays an important role in the implementation of backups in SQL Server. When a user starts a full backup, SQL Server records a complete snapshot of the data tables in backup files. At that point, SQL Server marks the current position in the transaction log and continues to record all changes to the database in the transaction log. Transactions logged during the process are also recorded as part of the full backup. When the backup is complete, SQL Server makes another mark in the transaction log. At the time of the next backup, a transaction log backup will suffice. To restore the database, an administrator first uses the full backup and then one or more transaction log backups that have been run since the full backup. SQL Server runs through the transaction log and applies changes to the data tables.
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