Article: Q142920
Product(s): Microsoft FoxPro
Version(s): 3.00 3.00b
Operating System(s):
Keyword(s): kbcode kbvfp300 kbvfp600
Last Modified: 20-AUG-1999
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The information in this article applies to:
- Microsoft Visual FoxPro for Windows, versions 3.0, 3.0b, 6.0
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SUMMARY
=======
SQL Server 6.0 has a new Identity property that can be used to create a unique
value for each row in a table. The identity property allows the user to specify
a seed value and an increment value. This article gives example code that shows
how to use the new Identity property.
MORE INFORMATION
================
The Identity property must be used with an integer datatype. (int, smallint, or
tinyint). Only one identity column is allowed per table. Identity columns cannot
be updated and won't accept NULL values.
Sample Code
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This example creates an Invoice table that has a starting invoice number of 1000
and increments by 1 for each new invoice record inserted.
* Establish connection to an existing datasource define to a SQL Server 6.0
* database.
xhandle = sqlconnect()
IF xhandle > 0
WAIT WINDOW "Successfull Connection. Handle = "+str(xhandle)
ELSE
WAIT WINDOW "Bad connection."
=errhand()
RETURN
ENDIF
* Create a table called Invoice and define the Identity property for the
* Invoice_no column - assuming that a table called invoice does not already
* exist.
x = SQLExec(xhandle,"Create table invoice (invoice_no INT" + ;
"identity(1000,1),customer varchar(25),;
amount money, inv_date datetime)")
IF x < 0
=errhand()
RETURN
ELSE
WAIT WINDOW "Table created successfully"
ENDIF
* Insert some new invoices.
x = SQLExec(xhandle,"Insert invoice (customer,amount,inv_date)" + ;
" Values('Brown & Assoc.',$40000,'01/01/96' )")
IF x < 0
=errhand()
RETURN
ENDIF
x = SQLExec(xhandle,"Insert invoice (customer,amount,inv_date)" + ;
"Values('Jones Inc.',$90000,'01/01/96' ) ")
IF x < 0
=errhand()
RETURN
ENDIF
x = SQLExec(xhandle,"Insert invoice (customer,amount,inv_date)" + ;
"Values('Golden Hedge',$25000,'01/01/96' )")
IF x < 0
=errhand()
RETURN
ENDIF
x = SQLExec(xhandle,"Insert invoice (customer,amount,inv_date)" + ;
"Values('CPUs R Us',$50000,'01/01/96' )")
IF x < 0
=errhand()
RETURN
ENDIF
* Check the values inserted.
x = SQLExec(xhandle,"Select * from invoice","Invoice")
IF x < 0
=errhand()
RETURN
ENDIF
SELECT Invoice
GO TOP
BROWSE
* Disconnect.
x = SQLDisconnect(xhandle)
IF x < 0
=errhand()
RETURN
ENDIF
* Error Handling Procedure
PROCEDURE errhand
=AERROR(myerror)
CLEAR
? 'An error has occurred.'
FOR n = 1 TO 7
? myerror(n)
ENDFOR
=SQLDisconnect(xhandle)
RETURN
Additional query words: VFoxWin
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Keywords : kbcode kbvfp300 kbvfp600
Technology : kbVFPsearch kbAudDeveloper kbVFP300 kbVFP300b kbVFP600
Version : 3.00 3.00b
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