SQL Server 2000 Stored Procedure & XML Programming in .NET

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SQL Server 2000 Stored Procedure & XML Programming
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Keep this problem in mind when writing batches. Developers in modern programming languages like Visual Basic or Visual C++ usually employ sophisticated error-handling strategies to avoid situations like this. Transact-SQL also contains programming constructs for error handling. We will explore them in the next chapter. The situation could be worse. Particular runtime errors (for example, constraint violations) do not stop execution of the batch. The following case attempts to use an Insert statement to insert a value in the identity column:
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Select Insert Values Select Go PartId, Make + ' ' + Model Part from Part into Part (PartId, Make, Model, Type) (1, 'IBM', 'Thinkpad 390D', 'Notebook') PartId, Make + ' ' + Model Part from Part
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The result is a partial failure :
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PartId Part ----------- -------------------------------------------------1 Toshiba Portege 7020CT (1 row(s) affected) Server: Msg 544, Level 16, State 1, Line 1 Cannot insert explicit value for identity column in table 'Part' when IDENTITY_INSERT is set to OFF. PartId Part ----------- ---------------------------------1 Toshiba Portege 7020CT (1 row(s) affected)
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In some cases, partial success may be tolerable, but in the real world it is generally not acceptable. Let s investigate a case in which several batches are written, divided by a Go statement, and executed together. Although the user has issued a single command to execute them, the client application will divide the code into batches and send them to the server separately. If an error occurs in any batch, the server will cancel its execution. However, this does not mean that execution of the other batches is canceled. The server will try to execute the next batch automatically. In some cases, this may be useful, but in most cases, it may not be what the user expects to happen. In the following example, one column needs to be deleted from the Part table. One way to perform this action (very popular until we were spoiled
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C h a p t e r 6 : C o m p o s i t e Tr a n s a c t - S Q L C o n s t r u c t s : B a t c h e s , S c r i p t s , a n d Tr a n s a c t i o n s
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with fancy tools like Enterprise Manager or the Alter Table Drop Column statement) would be to do the following:
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1. Create a provisional table to preserve the information that is currently
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in the Part table.
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2. Copy information from the Part table to the provisional table. 3. Drop the existing Part table. 4. Create a Part table without the column you want to delete. 5. Copy the preserved information back to the Part table. 6. Drop the table.
The code necessary to implement this functionality could be created in a set of five batches:
Create Table TmpPart (PartId int, Make varchar(50), Model varchar(50)) GO Insert into TmpPart (PartId, Make, Model) Select PartId, Make, Model from Part GO Drop Table Part GO Create Table Part (PartId int, Make varchar(50), Model varchar(50)) GO Insert into Part (PartId, Make, Model) Select PartId, Make, Model from TmpPart Go Drop Table TmpPart GO
In theory, this set of batches would work perfectly. However, there is just one problem it doesn t take errors into account. For example, if a syntax error occurs in the first batch, the temporary table will not be created. Part information will not
SQL Server 2000 Stored Procedure & XML Programming
be preserved in it, and when the code drops the table, the information will be lost. To observe a method that you can use to handle errors, read the next chapter.
DDL Batches
Data Definition Language (DDL) is that part of Transact-SQL dedicated to the creation and modification of database objects. Some DDL statements must stand alone in the batch, including the following statements: Create Procedure Create Trigger Create Default Create Rule Create View Set Showplan_Text Set Showplan_All If any of these statements is combined with other statements in a batch, the batch will fail. Create statements must stand alone because every other statement that follows them will be interpreted as a part of the Create statement. Set Showplan_Text and Set Showplan_All must stand alone in the batch because they are setting how SQL Server 2000 processes the batch and execution plan.
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