Difference between revisions of "ONOPEN Table Constraint"
From Recital Documentation Wiki
Yvonnemilne (Talk | contribs) |
Helengeorge (Talk | contribs) |
||
| Line 1: | Line 1: | ||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
==Purpose== | ==Purpose== | ||
Table constraint activated when the table is opened | Table constraint activated when the table is opened | ||
Revision as of 15:18, 29 October 2009
Purpose
Table constraint activated when the table is opened
Syntax
ONOPEN <procedure>
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 ONOPEN table constraint is activated when the table is opened. The <procedure> specified must be a character expression evaluating to a procedure name. If no file extension is included, '.prg' is assumed. The specified procedure is run after the operation to open the table is executed.
Example
ALTER TABLE customer modify ONOPEN "p_open";
Products
Recital Database Server, Recital Mirage Server, Recital Terminal Developer
