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SQL Server 2000 Stored Procedure Programming
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Exercise 4.9
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Create a stored procedure that lists orders and displays three-character abbreviations of order status and type; that is, Ordered Ord, Canceled Cnl, Deferred Dfr, and so on.
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Exercise 4.9 Solution
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Use the following code:
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Create Procedure prListOrders_CASE -- list Orders -- OrderStatus and OrderType are implemented -- using case statement not tables. As set nocount on SELECT [Order].OrderId, [Order].OrderDate, Contact.FirstName + ' ' + Contact.LastName AS [Ordered By], Location.Location, [Order].Note, OrgUnit.OrgUnit, Contact1.FirstName + ' ' + Contact1.LastName AS [Assigned To], CASE [Order].OrderTypeId When 1 then 'Req' When 2 then 'TRA' When 3 then 'SUP' When 4 then 'SCR' When 5 then 'RPR' When 6 then 'UPG' END, CASE [Order].OrderStatusid When 1 then 'Ord' When 2 then 'InP' When 3 then 'Cnl'
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Appendix B:
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Solutions to the Exercises
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When 4 then 'Cmp' When 5 then 'Dfr' END FROM [Order] INNER JOIN Contact ON [Order].RequestedById = Contact.ContactId INNER JOIN Location ON [Order].DestinationLocationId = Location.LocationId INNER JOIN OrgUnit ON [Order].VendorOrgUnitId = OrgUnit.OrgUnitId AND Contact.OrgUnitId = OrgUnit.OrgUnitId INNER JOIN Contact Contact1 ON [Order].AssignedToId = Contact1.ContactId return
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Exercise 4.10
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Create a stored procedure that will return a recordset with the field names of the specified table. The stored procedure should have only one input parameter table name.
Exercise 4.10 Solution
Use the following code:
Create Procedure prListColumns -- list columns of specified table ( @chvTableName sysname, @debug int = 0 ) As set nocount on declare @i tinyint, @ColName sysname -- collect all columns in one table/recordset Create Table #ColNames (ColName sysname)
SQL Server 2000 Stored Procedure Programming
Set @i = 1 -- loop through columns while @i <= 255 begin -- get column name SELECT @ColName = COL_Name( OBJECT_ID(@chvTableName), @i) -- check that we looped through all columns if @ColName is null BREAK if @debug <> 0 select @i i, @ColName ColName -- insert column into column insert into #ColNames (ColName) values (@ColName) set @i = @i + 1 end -- display list of columns select * from #ColNames drop table #ColNames return
Exercise 4.11
Explain the problems associated with the use of cursors.
Exercise 4.11 Solution
The nature of cursors is contrary to the spirit of SQL. Cursors are designed to work with a single record, and the basic idea behind SQL is to work with sets of records. If you use cursors, each operation has to be repeated for each record. This repetition is the reason you pay for their use with performance penalties. Some cursors also keep records in tables locked until they are released. Since the operations
Appendix B:
Solutions to the Exercises
performed by cursors are longer than those performed with a set of records, such operations are more prone to concurrency problems. Solutions based on cursors are also more prone to errors because they are more complex and thus require more error handling.
Exercise 4.12
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
select name from sysobjects where xtype = 'U'
Use a cursor to loop through the table names to display space information to users. This task is equivalent to Exercise 4.7. Compare the solutions.
Exercise 4.12 Solution
This stored procedure uses a cursor to loop through tables:
Create Procedure prSpaceUsedByTables_Cursor -- loop through table names in current database -- display info about amount of space used by each table As Set nocount on Declare @TableName sysname -- collect table names Declare curTables CURSOR FOR select name from sysobjects where xtype = 'U' Open curTables -- get first table name FETCH NEXT FROM curTables into @Tablename
SQL Server 2000 Stored Procedure Programming
exec sp_spaceused
@TableName
WHILE @@FETCH_STATUS = 0 BEGIN -- get next table FETCH NEXT FROM curTables into @TableName -- process next table exec sp_spaceused end @TableName
CLOSE curTables DEALLOCATE curTables
Exercise 4.13
Create two stored procedures that will return a resultset in the form of a denormalized Inventory table (see Figure B-3). All fields in the Inventory table that are links to other lookup tables should be replaced with values from those lookup tables. Each stored procedure should use a different method to obtain information:
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