Question

我正在使用Drools模板从电子表格生成规则。我的空单元有些问题。有人知道如何检查单元格或变量是否为空？这是模板：

template header
pid
department
maxAmount
storeId

package X.X.X

declare MaxAmountStore
    amount : Integer    
    storeId : String
end

template "FOO"
rule "MaxAmountStore_@{row.rowNumber}"
        when
            Product(pid == "@{pid}")
            Product(departmentId == "@{department}")
        then
            System.out.println("New MaxAmountStore: @{maxAmount} (store: @{storeId})");
            insert( new MaxAmountStore(@{maxAmount}, "@{storeId}"));
    end
end

是否可以有一个空的storeId？

Answer 1

我认为你需要这个：如果单元格中没有任何内容，你就不会关心departmentId值，而只想基于pid启动规则。

template "FOO"
rule "MaxAmountStore_@{row.rowNumber}"
when
    Product( pid == "@{pid}"&& 
             ("" == "@{department}" || departmentId == "@{department}") )
then
    ...
end

如何在Drools模板中检查变量是否为空

1 个答案: