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TSEQUAL Function
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SQL Server has the TSEqual function (no longer described in SQL Server Books Online), which compares timestamp values in the table and the Transact-SQL statement (see Figure 10-3). If they do not match, this function will raise an error 532 and abort the statement. This function allows a developer to write code that handles errors properly (for example, the user can be prompted for further action). If you executed the previous Update statement, the following one should cause SQL Server to force an error:
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update #aTable set description = 'test4' where id = 1 and TSEQUAL(ts, 0x000000000000007A)
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You can use this function in stored procedures to implement optimistic locking:
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Create Procedure prUpdateContact_1 -- update conrecord from contact table -- prevent user from overwriting changed record ( @intContactId int, @chvFirstName varchar(30), @chvLastName varchar(30), @chvPhone typPhone, @chvFax typPhone, @chvEmail typEmail, @insOrgUnitId smallint, @chvUserName varchar(50), @tsOriginal timestamp )
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As Set nocount on Update Contact Set FirstName = @chvFirstName, LastName = @chvLastName, Phone = @chvPhone, Fax = @chvFax, Email = @chvEmail, OrgUnitId = @insOrgUnitId, UserName = @chvUserName Where ContactId = @intContactId and TSEQUAL(ts, @tsOriginal) Return @@Error
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Figure 10-3.
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SQL Server 2000 Stored Procedure Programming
You will have no problem in executing this code from Transact-SQL:
Declare @intErrorCode int Exec @intErrorCode = prUpdateContact_1 1, 1, Select @intErrorCode ErrorCode 'Dejan', 'dejans', 'Sunderic', 0x00000000000009C3 '121-1111', '111-1112', 'dejans@hotmail.com',
Unfortunately, some versions of client development tools (for example, Visual Basic) and some data access methods (for example, RDO and ADO) have problems retrieving and using timestamp values. Before you implement 50 stored procedures in this manner, you should test whether your client development tools support timestamps. If they do not, you must implement a workaround.
Timestamp Conversion
The first workaround that comes to mind is to pass the timestamp as some other datatype. Binary(8) and varchar are the first options most people try. Unfortunately, client tools usually do not support binary datatypes either. The trouble with varchar is that SQL Server converts the timestamp to an empty string. One solution that works is based on the conversion of the timestamp to a datetime or money datatype (sounds strange, doesn't it ). Conversion in the opposite direction results in the same timestamp as well. You can test this workaround using the following code:
declare @dtmOriginal datetime, @tsOriginal timestamp Set @tsOriginal = 0x00000000000009C3 select @dtmOriginal = Convert(datetime, @tsOriginal) select @dtmOriginal, Convert (timestamp, @dtmOriginal)
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Advanced Stored Procedure Programming
NOTE: Both of these datatypes are eight bytes long, as is the timestamp datatype. Converted datetime or money values do not have any meaning. Although timestamp sounds as if it contains date information, it is, as we have said before, just a sequential number that is increased with every database change.
The stored procedure will have to be modified:
Create Procedure prUpdateContact -- update conrecord from contact table -- prevent user from overwriting changed record ( @intContactId int, @chvFirstName varchar(30), @chvLastName varchar(30), @chvPhone typPhone, @chvFax typPhone, @chvEmail typEmail, @insOrgUnitId smallint, @chvUserName varchar(50), @dtmOriginalTS datetime ) As set nocount on declare @tsOriginalTS timestamp, @intErrorCode int set @intErrorCode = @@Error if @intErrorCode = 0 begin Set @tsOriginalTS = Convert(timestamp, @dtmOriginalTS) set @intErrorCode = @@Error end
SQL Server 2000 Stored Procedure Programming
if @intErrorCode = 0 begin Update Contact Set FirstName = @chvFirstName, LastName = @chvLastName, Phone = @chvPhone, Fax = @chvFax, Email = @chvEmail, OrgUnitId = @insOrgUnitId, UserName = @chvUserName where ContactId = @intContactId and TSEqual(ts, @tsOriginalTS) set @intErrorCode = @@Error end return @intErrorCode
Naturally, you will have to read records using a stored procedure that will convert the timestamp to a datetime or money datatype too:
Create Procedure prGetContact -- get Contact record with timestamp converted to datetime ( @intContactId int ) As set nocount on SELECT ContactId, FirstName, LastName, Phone, Fax, Email, OrgUnitId, UserName,
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