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13.41. The Modify Statement

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Name Description Syntax Example

modify

Table 13.6. The Modify Statement
Name	Description	Syntax	Example
modify	This provides a structured approach to fact updates. It combines the update operation with a number of setter calls to change the object's fields.	`modify ( <fact-expression> ) { <expression> [ , <expression> ]* }` Copy to Clipboard Toggle word wrap The parenthesized <fact-expression> must yield a fact object reference. The expression list in the block should consist of setter calls for the given object, to be written without the usual object reference, which is automatically prepended by the compiler.	`rule "modify stilton" when $stilton : Cheese(type == "stilton") then modify( $stilton ){ setPrice( 20 ), setAge( "overripe" ) } end` Copy to Clipboard Toggle word wrap

This provides a structured approach to fact updates. It combines the update operation with a number of setter calls to change the object's fields.

modify ( <fact-expression> ) {
    <expression> [ , <expression> ]*
}

modify ( <fact-expression> ) {
    <expression> [ , <expression> ]*
}

Copy to Clipboard

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The parenthesized <fact-expression> must yield a fact object reference. The expression list in the block should consist of setter calls for the given object, to be written without the usual object reference, which is automatically prepended by the compiler.

rule "modify stilton"
when
    $stilton : Cheese(type == "stilton")
then
    modify( $stilton ){
        setPrice( 20 ),
        setAge( "overripe" )
    }
end

rule "modify stilton"
when
    $stilton : Cheese(type == "stilton")
then
    modify( $stilton ){
        setPrice( 20 ),
        setAge( "overripe" )
    }
end

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13.41. The Modify Statement

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