barcode generator vb.net free -Valued User-Defined Functions in Software

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Table-Valued User-Defined Functions
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Since SQL Server 2000 has a table datatype, it is possible to design a user-defined function that returns a table. The primary use of table-valued user-defined functions is similar to the use of views. However, these functions are far more flexible and provide additional functionality. You can use a table-valued user-defined function anywhere you can use a table (or view). In this respect, they implement the functionality of views, but functions can have parameters and
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Special Types of Procedures
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therefore they are dynamic. Views are also limited to a single Select statement. Functions can have one or more Transact-SQL statements inside and in this way implement more complex functionality. That is why functions of this type are often referred to as multi-statement table-valued user-defined functions. Stored procedures can also return a resultset, but the use of such resultsets is somewhat limited. For example, only a resultset returned by a function can be referenced in the From clause of a Select statement. Let s demonstrate this functionality. The following Select statement references the user-defined function fnDueDays, which returns a list of lease payment due dates. The statement returns a list of remaining payments and due dates:
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select DD.TermId, DD.DueDate, Inventory.Lease from dbo.fnDueDays('1/1/2000','1/1/2004','monthly') DD, Inventory where InventoryId = 8 and DD.DueDate > GetDate()
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TermId ----------3 4 5 6 7 ... DueDate --------------------------2000-04-01 00:00:00 2000-05-01 00:00:00 2000-06-01 00:00:00 2000-07-01 00:00:00 2000-08-01 00:00:00 Lease -----------87.7500 87.7500 87.7500 87.7500 87.7500
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Stored procedure prListTerms has functionality similar to the functionality of the DueDates function. But to perform additional filtering of the resultset returned by the stored procedure, the developer would first need to receive the resultset into a temporary table:
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Create Table #tbl(TermId int, DueDate smalldatetime) Insert Into #Tbl(TermId, DueDate) Exec prListTerms '1/1/2000','1/1/2004','monthly' Select #tbl.TermId, #tbl.DueDate, Inventory.Lease
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SQL Server 2000 Stored Procedure Programming
From #tbl, Inventory Where InventoryId = 8 And #tbl.DueDate > GetDate() Drop Table #tbl
This is much more complicated than using the comparable function. Let s investigate the internals of the fnDueDate function:
Create Function fnDueDays -- return list of due days for the leasing ( @dtsStartDate smalldatetime, @dtsEndDate smalldatetime, @chvLeaseFrequency varchar(20) ) Returns @tblTerms table ( TermID int, DueDate smalldatetime ) As Begin Declare @insTermsCount smallint -- number of intervals Declare @insTerms smallint -- number of intervals -- calculate number of terms Select @insTermsCount = Case @chvLeaseFrequency When 'monthly' then DateDIFF(month, @dtsStartDate, @dtsEndDate) When 'semi-monthly' then 2 * DateDIFF(month, @dtsStartDate, @dtsEndDate) When 'bi-weekly' then DateDIFF(week, @dtsStartDate, @dtsEndDate)/2 When 'weekly' then DateDIFF(week, @dtsStartDate, @dtsEndDate)
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When 'quarterly' then DateDIFF(qq, @dtsStartDate, @dtsEndDate) When 'yearly' then DateDIFF(y, @dtsStartDate, @dtsEndDate) End -- generate list of due dates Set @insTerms = 1 While @insTerms <= @insTermsCount Begin Insert @tblTerms (TermID, DueDate) Values (@insTerms, Convert(smalldatetime, CASE When @chvLeaseFrequency = 'monthly' then DateADD(month,@insTerms, @dtsStartDate) When @chvLeaseFrequency = 'semi-monthly' and @insTerms/2 = Cast(@insTerms as float)/2 then DateADD(month, @insTerms/2, @dtsStartDate) When @chvLeaseFrequency = 'semi-monthly' and @insTerms/2 <> Cast(@insTerms as float)/2 then DateADD(dd, 15, DateADD(month, @insTerms/2, @dtsStartDate)) When @chvLeaseFrequency = 'bi-weekly' then DateADD(week, @insTerms*2, @dtsStartDate) When @chvLeaseFrequency = 'weekly' then DateADD(week, @insTerms, @dtsStartDate) When @chvLeaseFrequency = 'quarterly' then DateADD(qq, @insTerms, @dtsStartDate) When @chvLeaseFrequency = 'yearly' then DateADD(y, @insTerms, @dtsStartDate) End , 105)) Select @insTerms = @insTerms + 1 End Return End
SQL Server 2000 Stored Procedure Programming
Let me point out to you a few differences between these functions and scalar functions. User-defined functions that return a table have a table variable definition in the Returns clause:
... Returns @tblTerms table ( TermID int, DueDate smalldatetime ) ...
In the body of the function, there are statements that fill the contents of the table variable:
... Insert @tblTerms (TermID, DueDate) Values (@insTerms, Convert(smalldatetime, CASE When @chvLeaseFrequency = 'monthly' ...
The Return statement at the end of the function does not specify a value. As soon as it is reached, SQL Server returns the contents of the table variable to the caller:
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