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Create Procedure prInsertInventory -- insert inventory record and return Id @intEquipmentId int, @intLocationId int, @inyStatusId tinyint, @intLeaseId int, @intLeaseScheduleId int, @intOwnerId int, @mnsRent smallmoney, @mnsLease smallmoney, @mnsCost smallmoney, @inyAcquisitionTypeID int, @intInventoryId int output As Set Nocount On Declare @intErrorCode int Select @intErrorCode = @@Error If @intErrorCode = 0 Begin Insert into Inventory (EquipmentId, LocationId, StatusId, LeaseId, LeaseScheduleId, OwnerId, Rent, Lease, Cost, AcquisitionTypeID) Values ( @intEquipmentId, @intLocationId, @inyStatusId, @intLeaseId, @intLeaseScheduleId, @intOwnerId, @mnsRent, @mnsLease, @mnsCost, @inyAcquisitionTypeID) Select @intErrorCode = @@Error, @intInventoryId = @@identity End Return @intErrorCode

10:

Unfortunately, the previous solution does not always work. SQL Server has a bug/feature that can change a value stored in the @@identity global variable. If the table in which the record was inserted (in this case, Inventory) has a trigger that inserts a record into some other table with an identity key, the value of that key will be recorded in @@identity. You can reproduce this behavior using the following script. It must be executed against the tempdb database.

If you plan to perform some dramatic action, such as deleting or renaming a database object, you should first investigate which objects will be affected by it. Microsoft SQL Server keeps a list of dependencies between objects in the sysdepends system table in each database. To view this list in Enterprise Manager:

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Create Table a (a_id int identity(1,1), a_desc varchar(20), b_desc varchar(20)) Go Create Table b (b_id int identity(1,1), b_desc varchar(20)) Go Create Trigger tr_a_I On dbo.a After Insert As If @@Rowcount = 0 Return Insert Into b (b_desc) Select b_desc from inserted Go -- For Insert

Now execute this batch:

Insert into b (b_desc) Values ('1') Insert into a (a_desc, b_desc)

Values ('aaa', 'bbb') Select @@identity [IdentityValue]

Figure 1-3.

Query Analyzer returns the following result:

(1 row(s) affected)

1. Right-click the name of the database object. 2. Select All Tasks. 3. Click Display Dependencies, and SQL Server will display a list of

(1 row(s) affected)

IdentityValue ---------------------------------------2 (1 row(s) affected)

The first Insert statement adds the first record to table b. The second Insert statement adds the first record in a table. Because there is a trigger on the table, another record (the second one) will be inserted into table b, and the value of @@identity will be set to 2. If there was no trigger, the Select statement would return a value of 1.

Unfortunately, it is not easy to solve this problem. One solution is to create a table (for example, SequenceNumbers) that contains the highest sequence numbers for each table. So, each time that you want to insert a record into a table, you need to obtain a value from the sequence numbers table and increment that number by one. This value will then be used as a unique identifier (id) for the record that you want to insert.

10:

This technique was a standard way to implement surrogate keys in earlier versions of SQL Server before identity values were introduced. Unfortunately, this technique is prone to concurrency contention problems, because there might be more processes competing to read, lock, and update a sequence key value. In earlier versions of SQL Server, it was not possible to lock a record, but only a page. A page could contain more than one record. Therefore, the process could lock a record even if the intent was to update some other record. This problem used to be solved by mechanically increasing the size of the record so that only one record could fit on a page. Dummy fields used to be added so that the size of the record became larger than half of the page (2K / 2 = 1K). This trick is called padding.

The program displays two lists. The list to the left shows objects that reference the selected object (dependent). The list to the right shows objects that are referenced by the object (depending). In the case of prListInventoryEquipment, since no object in the database is using it, the list to the left is empty.

In SQL Server 2000 and SQL Server 7.0, there is no need for this because these versions automatically lock a record. However, processes can still compete to read, lock, and update a sequence key value in the same record. This can lead to a deadlock. The following stored procedure might be used to obtain an identifier from a table with sequence numbers:

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