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The OCLOperator PSEval makes it possible to use oclPS in any OCL expression. Using this, you can "reach into" the database from OCL and action-language (EAL). | |||
Expression template: | |||
SomeClass.PSEval(<ps-expression>,maxfetch,offset,<dependon>) | |||
'''Note!''' PSEval doesn't subscribe to sets from DB. To make the operator auto-updating, provide an expression in "dependon" that, when changed, should also rerun the PSEval expression. This can, for example, be a timer. | |||
'''Note!''' Offset is 0-based. | |||
Example: | |||
Uppdrag.PSEval(self.Uppdrag->select(u|u.Aktivt)->orderDescending(u|u.Startdatum), 1000, 0, self.Uppdrag) | |||
For example, this expression from a method has "userName" as a parameter: | |||
SysUser.PSEval(SysUser.allinstances->select(su|su.Username=userName),2,0,<nowiki>''</nowiki>) | |||
Always remember that your SQL-server might also need indexes and other performance settings to execute your expression efficiently. | |||
'''Note!''' The offset parameter should almost always be 0, if not used to show a seconds page in a pagination or similar. | |||
See also: [[OCLOperators Sqlpassthrough|Sqlpassthrough]], [[OCLOperators PSEvalValue|PSEvalValue]], [[OCLOperators PSEvalTuples|PSEvalTuples]] | |||
[[Category:OCLOperators]] | |||
{{Edited|July|12|2024}} | |||
Revision as of 15:39, 10 February 2024
The OCLOperator PSEval makes it possible to use oclPS in any OCL expression. Using this, you can "reach into" the database from OCL and action-language (EAL).
Expression template:
SomeClass.PSEval(<ps-expression>,maxfetch,offset,<dependon>)
Note! PSEval doesn't subscribe to sets from DB. To make the operator auto-updating, provide an expression in "dependon" that, when changed, should also rerun the PSEval expression. This can, for example, be a timer.
Note! Offset is 0-based.
Example:
Uppdrag.PSEval(self.Uppdrag->select(u|u.Aktivt)->orderDescending(u|u.Startdatum), 1000, 0, self.Uppdrag)
For example, this expression from a method has "userName" as a parameter:
SysUser.PSEval(SysUser.allinstances->select(su|su.Username=userName),2,0,'')
Always remember that your SQL-server might also need indexes and other performance settings to execute your expression efficiently.
Note! The offset parameter should almost always be 0, if not used to show a seconds page in a pagination or similar.
See also: Sqlpassthrough, PSEvalValue, PSEvalTuples