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If @inyDayOfWeek = 1 -- Sunday Return DateAdd(d, 3, @dtmDate ) If @inyDayOfWeek = 7 -- Saturday Return DateAdd(d, 4, @dtmDate ) If @inyDayOfWeek = 6 -- Friday Return DateAdd(d, 5, @dtmDate ) If @inyDayOfWeek = 5 -- Thursday Return DateAdd(d, 5, @dtmDate ) If @inyDayOfWeek = 4 -- Wednesday Return DateAdd(d, 5, @dtmDate ) Return DateAdd(d, 3, @dtmDate ) End

Figure 9-4.

User-defined functions have one serious limitation. They cannot have side effects. A function side effect is any permanent change to resources (such as tables) that have a scope outside of the function (such as a non-temporary table that is not declared in the function). Basically, this requirement means that a function should return a value while changing nothing in the database.

2:

TIP: In some development environments like C or Visual Basic, a developer can write a function that can perform some additional activities or changes, but it is a matter of good design and discipline not to abuse that opportunity.

SQL Server forces the user not to create side effects by limiting which Transact-SQL statements can be used inside a function:

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Temporary Global temporary Remote There are also database objects, which are very similar in nature: Triggers Views User-defined functions As you can infer from the name, user-defined stored procedures are simply plain stored procedures assembled by administrators or developers for later use. All the examples we have discussed so far in this chapter have been such stored procedures. Microsoft delivers a vast set of stored procedures as part of SQL Server. They are designed to cover all aspects of system administration. Internally, system stored procedures are just regular stored procedures. Their special features result from the fact that they are stored in system databases (master and msdb) and they have the prefix sp_. This prefix is more than just a convention. It signals to the server that the stored procedure should be accessible from all databases without putting the database name as a prefix to fully qualify the name of the procedure. For example, you can use sp_spaceused to examine usage of the current database; such as disk space for data and indexes (see Figure 3-1). We will examine all types of stored procedures in more detail in 8.

Assignment statements (Set or Select) referencing objects local to the function (such as local variables and a return value) Flow control statements Update, Insert, and Delete statements that update local table variables Declare statements that define local variables or cursors Statements that declare, open, close, fetch, and deallocate local cursors (the only Fetch statements allowed are ones that retrieve information from a cursor into local variables)

User-defined functions cannot call built-in functions that return different data on each call, such as these: @@CONNECTIONS @@CPU_BUSY @@TIMETICKS @@TOTAL_ERRORS

9:

Notice that GetDate() is also 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 9-5.

Figure 9-5.

As is the case with stored procedures, functions can be encrypted so that nobody can see their source code. The developer just needs to create or alter the function using the With Encryption option.

Figure 3-1

A new option, With Schemabinding, allows developers to schema-bind a user-defined function to database objects (such as tables, views, and other used-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 user-defined functions and views 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 has References permissions on all referenced database objects.

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