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SQL Server 2000 Stored Procedure Programming
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from sysobjects where xType = 'U' Open @curTables -- get first table Fetch Next From @curTables Into @chvTable -- if we successfully read the current record While (@@fetch_status = 0) Begin -- assemble DOS command for exporting table Set @chvCommand = 'bcp "Asset..[' + @chvTable + ']" out C:\sql7\backup\' + @chvTable + '.txt -c -q -Sdejan -Usa -Pdejan' -- during test just display command If @debug <> 0 Select @chvCommand chvCommand -- in production execute DOS command and export table If @debug = 0 Execute xp_cmdshell @chvCommand, NO_OUTPUT Fetch Next From @curTables Into @chvTable End Close @curTables Deallocate @curTables Return 0
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If you execute this stored procedure (without specifying the @debug parameter), SQL Server will execute the following sequence of command prompt commands to export tables:
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Basic Transact-SQL Programming Constructs
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bcp "Asset..[AcquisitionType]" out C:\sql7\backup\AcquisitionType.txt -c -q -Sdejan -Usa -Pdejan bcp "Asset..[MyEquipment]" out C:\sql7\backup\MyEquipment.txt -c -q -Sdejan -Usa -Pdejan bcp "Asset..[Equipment]" out C:\sql7\backup\Equipment.txt -c -q -Sdejan -Usa -Pdejan bcp "Asset..[EqType]" out C:\sql7\backup\EqType.txt -c -q -Sdejan -Usa -Pdejan bcp "Asset..[ActivityLog]" out C:\sql7\backup\ActivityLog.txt -c -q -Sdejan -Usa -Pdejan bcp "Asset..[OrderType]" out C:\sql7\backup\OrderType.txt -c -q -Sdejan -Usa -Pdejan bcp "Asset..[OldEquipment]" out C:\sql7\backup\OldEquipment.txt -c -q -Sdejan -Usa -Pdejan bcp "Asset..[Property]" out C:\sql7\backup\Property.txt -c -q -Sdejan -Usa -Pdejan bcp "Asset..[OrderStatus]" out C:\sql7\backup\OrderStatus.txt -c -q -Sdejan -Usa Pdejan .
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TIP: In 10, we will demonstrate another method for looping through a set of records using the While statement. Personally, I seldom use cursors; I prefer to use the method demonstrated in 10.
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After reading this chapter, you should be able to
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Define regular and delimited identifiers. Select the appropriate datatype. Declare a variable. Assign a value to the variable using a Select, Set, or Update statement. Display the value of the variable to a user. Use global variables. Use the @@identity variable to read the value of a key field. Read the value of the @@error variable to determine if a statement was successful.
Transact-SQL is not a feature-rich programming language, but its statements, if well harnessed, will arm the developer to code even the most complex algorithms. We have demonstrated how the developer can use comments to document code and make it more understandable. We have learned
SQL Server 2000 Stored Procedure Programming
the rules that are of the utmost importance in the formulation of comments. We have seen how to implement conditional executions using an If statement and how to use the While statement to implement a loop. We have learned how to schedule executions using the WaitFor statement and the risks involved in overusing the GoTo statement. Cursors are a powerful feature designed to bridge the gap between the relational aspect of database systems and the navigational aspect of client applications. We have seen that the use of cursors creates some performance and structural problems in stored procedures, and we have concluded that they should be used with caution and only for problems that cannot be resolved with set operations.
EXERCISES
1. Which datatypes can store strings and what are the differences among them 2. Is it better to use decimal or real variables to store monetary values 3. When variables are assigned with a Select statement that returns a recordset instead of a single record, which values will be assigned to the variables 4. What values will be assigned to the variable when a Select statement returns an empty recordset 5. Create two stored procedures prStoreOrder, which will insert an order and return an Order number, and prStoreOrderItem, which will insert the item of the order. 6. Create a stored procedure that creates a temporary table with just one integer field. The stored procedure should then insert numbers from 1 to 100 into the table and at the end, return those numbers as a resultset to the caller. 7. Stored procedure sp_spaceused can return information about the space used by a database object. Collect the names of all tables in the Asset database using:
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