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You now should use Scope_Identity() instead of the @@identity function.
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Distributed environments have different requirements for the generation of unique keys. A typical example is a database of sales representatives who are carrying notebook computers with local databases installed on them. These users do not have to be connected to a central database. They do the majority of their work locally and then replicate the information in their local database to the central database once in a while. The use of identity fields as a unique key will lead to unique key violations, unless the key is composite and consists of an identity field and another field that is unique to the user. Another solution could be to divide key ranges between users (for example, by setting an identity seed differently in each database). Each of these solutions has different limitations. One way to generate unique keys is to use GUIDs (globally unique identifiers). The uniqueidentifier data type was discussed in 4. When a column in a table is assigned this data type, it does not mean that its (unique) value will be generated automatically. The unique value must be generated using the NewID() function. Typically, a GUID value is generated as a default value of a table, as shown in the following code:
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Create Table Location( LocationId uniqueidentifier NOT NULL DEFAULT newid(), Location varchar(50) not null, CompanyId int NOT NULL, PrimaryContactName varchar(60) NOT NULL, Address varchar(30) NOT NULL, City varchar(30) NOT NULL, ProvinceId varchar(3) NULL, PostalCode varchar(10) NOT NULL, Country varchar(20) NOT NULL, Phone varchar(15) NOT NULL, Fax varchar(15) NULL ) Go
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You can also generate a GUID in a stored procedure:
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Create Procedure prInsertLocation @Location varchar(50), @CompanyId int, @PrimaryContactName varchar(60), @Address varchar(30) , @City varchar(30) , @ProvinceId varchar(3) , @PostalCode varchar(10), @Country varchar(20) , @Phone varchar(15), @Fax varchar(15), @LocationGUID uniqueidentifier OUTPUT AS Set @LocationGUID
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= NewId()
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Insert Into Location (Location_id, Location, CompanyId, PrimaryContactName, Address, City, ProvinceId, PostalCode, Country, Phone, Fax) values (@LocationGUID, @Location, @CompanyId, @PrimaryContactName, @Address, @City, @ProvinceId, @PostalCode, @Country, @Phone, @Fax) Return @@error
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The stored procedure will return the GUID value to the caller.
9: Advanced Stored Procedure Programming
A While Loop with Min() or Max() Functions
It is possible to iterate through a table or recordset using a While statement with the aggregate() function, which returns extreme values: Min() and Max(). Take a look at the following batch:
declare Value int -- get first value Select @Value = MIN(Value) From aTable -- loop While @Value is not null Begin -- do something instead of just displaying a value Select @Value value -- get next value Select @Value = MIN(Value) From aTable Where Value > @Value End
The first Select statement with the Min() function obtains a first value from the set (table):
Select @Value = MIN(Value) From aTable
The next value is obtained in a loop as a minimal value bigger than the previous one:
Select @Value = MIN(Value) From aTable Where Value > @Value
If no records qualify as members of the set, an aggregate() function will return null. You can then use null as a criterion to exit the loop:
While @Value is not null
SQL Server 2000 Stored Procedure & XML Programming
To demonstrate this method, the following rewrites prSpaceUsedByTables, which displays the space used by each user-defined table in the current database:
Create Procedure prSpaceUsedByTables_4 -- loop through table names in current database -- display info about amount of space used by each table -- demonstration of while loop As Set nocount on Declare @TableName sysname -- get first table name Select @TableName = Min(name) From sysobjects Where xtype = 'U' While @TableName is not null Begin -- display space used Exec sp_spaceused @TableName -- get next table Select @TableName = Min(name) From sysobjects Where xtype = 'U' And name > @TableName End Return 0
This was just an academic example. Naturally, the proper solution includes a temporary table to collect all results and display them at the end in one recordset. Note that I am not talking about a temporary table such as the one used in 4 for looping using a While statement. You can step backward through the recordset if you use the Max() function and if you compare the old record and the remainder of the set using the < operator.
This method may be a quick solution for problems that require iteration. However, solutions based on set operations usually provide superior performance.
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