Difference between revisions of "ON ERROR"
Yvonnemilne (Talk | contribs) |
Yvonnemilne (Talk | contribs) |
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<code lang="recital"> | <code lang="recital"> | ||
procedure badfile | procedure badfile | ||
| − | on error | + | on error |
| − | set message to "File does not exist." | + | set message to "File does not exist." |
return to master | return to master | ||
Revision as of 16:10, 1 June 2009
Contents
ON ERROR
Class
Error Handling and Debugging
Purpose
Trap program errors
Syntax
ON ERROR [<command>]
See Also
ERRNO(), ERROR(), MESSAGE(), ON ESCAPE, ON KEY, RETRY, SET ONERROR
Description
The ON ERROR command causes the specified <command> to be executed if an error is encountered in a program. If ON ERROR is specified without a <command>, then the default Recital/4GL behavior will be restored. By default, the Recital/4GL will stop execution at the error and an error.mem file will be created
<command>
The <command> can be any Recital/4GL command. After an error is encountered, the ERROR() function will return the error number, and the MESSAGE () function will return the error message. Specifying an '*' as the command causes any errors to be ignored, so should be used with caution. The RETRY command is often used with the ON ERROR trapping facility.
Example
procedure badfile on error set message to "File does not exist." return to master on error do badfile use patrons
Products
Recital Database Server, Recital Mirage Server, Recital Terminal Developer
