Difference between revisions of "ONOPEN Table Constraint"
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==Purpose== | ==Purpose== | ||
Table constraint activated when the table is opened | Table constraint activated when the table is opened | ||
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==Syntax== | ==Syntax== | ||
ONOPEN <procedure> | ONOPEN <procedure> | ||
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==See Also== | ==See Also== | ||
[[ALTER TABLE]], [[SQL Constraints|CONSTRAINTS]], [[CREATE TABLE]] | [[ALTER TABLE]], [[SQL Constraints|CONSTRAINTS]], [[CREATE TABLE]] | ||
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==Description== | ==Description== | ||
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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. | 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. | ||
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==Example== | ==Example== | ||
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[[Category:Documentation]] | [[Category:Documentation]] | ||
[[Category:SQL]] | [[Category:SQL]] | ||
Latest revision as of 10:02, 7 December 2012
Contents
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"
