Difference between revisions of "ERROR Table Constraint"

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=ERROR=
 
 
 
==Class==
 
Table Constraints
 
 
 
 
==Purpose==
 
==Purpose==
 
Table constraint to define an error message to be displayed when a validation check fails
 
Table constraint to define an error message to be displayed when a validation check fails

Revision as of 15:00, 29 October 2009

Purpose

Table constraint to define an error message to be displayed when a validation check fails


Syntax

ERROR <expC>


See Also

ALTER TABLE, CONSTRAINTS, CREATE TABLE


Description

A constraint is used to define rules that help to provide data integrity. TABLE constraints apply to table-based operations. You must have ALTER privilege on the table. The table will be locked for EXCLUSIVE use during the operation.

The ERROR table constraint is used to define an error message to be displayed when a validation check fails. The <expC> is a character string of up to 80 characters.


Example

set sql to vfp
CREATE TABLE purchase_order (POid i PRIMARY KEY, SuppId i, POtotal n(10,2), ;
CHECK callauth() ERROR [Not authorized])


Products

Recital Database Server, Recital Mirage Server, Recital Terminal Developer