OCLOperators PSEval
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Makes it possible use oclPS in any OCL expression. Using this you can "reach into" the database from OCL and action-language (EAL) | 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 | Expression template: | ||
SomeClass.PSEval(<ps-expression>,maxfetch,offset,<dependon>) | SomeClass.PSEval(<ps-expression>,maxfetch,offset,<dependon>) | ||
'''Note!''' - PSEval | '''Note!''' - PSEval doesn't subscribe on 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. | ||
Example | Example: | ||
Uppdrag.PSEval(self.Uppdrag->select(u|u.Aktivt)->orderDescending(u|u.Startdatum), 1000, 0, self.Uppdrag) | Uppdrag.PSEval(self.Uppdrag->select(u|u.Aktivt)->orderDescending(u|u.Startdatum), 1000, 0, self.Uppdrag) | ||
For example this expression from a method | 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>) | 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 | Always remember that your SQL-server might also need indexes and other performance settings to execute your expression efficiently. | ||
See also [[OCLOperators Sqlpassthrough|Sqlpassthrough]] , [[OCLOperators PSEvalValue|PSEvalValue]] | See also: [[OCLOperators Sqlpassthrough|Sqlpassthrough]], [[OCLOperators PSEvalValue|PSEvalValue]] | ||
[[Category:OCLOperators]] | [[Category:OCLOperators]] | ||
Revision as of 08:10, 3 March 2023
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 on 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.
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.
See also: Sqlpassthrough, PSEvalValue
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