barcode generator vb.net download Use of Built-in Functions in VS .NET

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Use of Built-in Functions
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User-defined functions cannot call built-in functions that return different data on each call, such as these:
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@@CONNECTIONS @@CPU_BUSY @@IDLE @@IO_BUSY @@MAX_CONNECTIONS @@PACK_RECEIVED @@PACK_SENT @@PACKET_ERRORS
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@@TIMETICKS @@TOTAL_ERRORS @@TOTAL_READ @@TOTAL_WRITE GetDate() NewId() Rand() TextPtr()
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Notice that GetDate() is among the forbidden functions. If you try to use it inside a user-defined function, SQL Server will report an error, as shown in Figure 8-5.
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As is the case with stored procedures, functions can be encrypted so that nobody can see their source code. You just need to create or alter the function using the With Encryption option.
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Figure 8-5
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Limitation on use of built-in functions in user-defined functions
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SQL Server 2000 Stored Procedure & XML Programming
Schema-Binding
A new option, With Schemabinding, allows developers to schema-bind a user-defined function to database objects (such as tables, views, and other user-defined functions) that it references. Once the function is schema-bound, it is not possible to make schema changes on underlying objects. All attempts to drop the objects and all attempts to alter underlying objects (which would change the object schema) will fail. A function can be schema-bound only if all of the following criteria are satisfied: All existing user-defined functions and views referencing the objects referenced by the function must already be schema-bound. All database objects that the function references must reside in the same database as the function. References to database objects cannot have server or database qualifiers. Only object owner qualifiers and object identifiers are allowed. The user who executes the Create (or Alter) Function statement must have References permissions on all referenced database objects.
Table-Valued User-Defined Functions
Since SQL Server 2000 has a table data type, 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, table-valued user-defined functions implement the functionality of views, but functions can have parameters, and therefore are dynamic. Views are also limited to a single Select statement. Functions can have one or more Transact-SQL statements inside, enabling them to implement more complex functionality. That is why functions of this type are often referred to as multistatement table-valued user-defined functions. Stored procedures can also return a result set, but the use of such result sets is somewhat limited. For example, only a result set returned by a function (and not a stored procedure) can be referenced in the From clause of a Select statement. To 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.
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()
C h a p t e r 8 : S p e c i a l Ty p e s o f P r o c e d u r e s
The result looks like this:
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
The stored procedure prListTerms has functionality similar to the functionality of the fnDueDates() function. But to perform additional filtering of the result set returned by the stored procedure, you would first need to load the result set into a temporary table:
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 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
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