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of the table from which you want to retrieve records, SQL Server will not report a syntax error during compilation but will report a runtime error during execution.
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Create Procedure prDeferredNameResolution As set nocount on select 'Start' select * from NonExistingTable select 'Will execution be stopped ' return
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If you attempt to run this stored procedure, SQL Server will return the following:
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----Start Server: Msg 208, Level 16, State 1, Procedure prDeferredNameResolution, Line 7 Invalid object name 'NonExistingTable'.
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The execution will be stopped. Even an error handler written in Transact-SQL will not be able to proceed at this point.
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Be very cautious when you use cursors. Test the status after each fetch; place error handling after each command; do not forget to close and deallocate the cursor when you do not need it any more. There are many rules and regulations for using cursors, and some of them might seem trivial, but even the smallest mistake can halt the execution of your code.
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The overconfidence that comes with routine may be your worst enemy. If you perform the same or similar tasks over and over again, you can lose focus and skip basic steps. Do not put code into production before it is thoroughly tested; do not place bug fixes
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SQL Server 2000 Stored Procedure Programming
directly into production; use error handling even if the code seems straightforward and the chance for error slight.
ERROR HANDLING
A developer s effective use of error handling procedures is often an excellent indicator of his or her seniority in that particular programming language. Those of us who deal with a C or Visual Basic environment are accustomed to a whole set of feature-rich error handling objects, procedures, and functions. Compared with them, TSQL seems rather inadequate. The developer can employ only one global variable and a few procedures for setting or raising errors. However, the apparent inadequacy of the tool set cannot justify sloppy solutions. In this section, we will discuss the concept of error handling and offer a coherent methodology for its implementation. We will also discuss some alternative techniques involving the XACT_ABORT and Raiserror statements.
Using Error Handling
Since TSQL is so laconic (critics may say feature poor), development DBAs commonly express themselves in a very concise manner. DBAs frequently write ad hoc scripts for one-time use or manual execution, and they thus neglect the need for consistent error handling. Logic that is fine in standard languages like Visual Basic or C frequently does not work in TSQL. For example, an error may occur in TSQL, but if TSQL does not consider it fatal, processing will continue. Also, if the error is fatal, all processing will stop. The process does not react: it is just killed.
Why Bother
For many, the question is why be concerned with implementing error handling at all Let us review this question through the following example:
7:
Debugging and Error Handling
Create Procedure prInsertLeasedAsset_1 -- Insert leased asset and update total in LeaseSchedule. -- (demonstration of imperfect solution) ( @intEquipmentId int, @intLocationId int, @intStatusId int, @intLeaseId int, @intLeaseScheduleId int, @intOwnerId int, @mnyLease money, @intAcquisitionTypeID int ) As set nocount on begin transaction -- insert asset insert Inventory(EquipmentId, StatusId, Lease, values ( @intStatusId, @mnyLease, -- update total update LeaseSchedule Set PeriodicTotalAmount = PeriodicTotalAmount + @mnyLease where LeaseId = @intLeaseId commit transaction return LocationId, LeaseId, AcquisitionTypeID) @intLeaseId, @intAcquisitionTypeID)
LeaseScheduleId, OwnerId, @intEquipmentId, @intLocationId, @intLeaseScheduleId,@intOwnerId,
SQL Server 2000 Stored Procedure Programming
This may seem a trivial example, and it is true that in all probability nothing would go wrong, but let s imagine an error occurs on the Update statement. The error could be for any reason overflow, some constraint, or inadequate permission, for example. As explained earlier, transactions do not roll back on their own when an error occurs. Instead, SQL Server simply commits everything that was changed when it encounters the Commit Transaction statement as if nothing unusual had happened. Unfortunately, from that moment on, the total of the lease schedule will have the wrong value.
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