问题描述
请让我知道如何使用.?" (空安全运算符)在决定决策表(Spreadsheet)中.附加了我的电子表格，对于mdcl对象，我需要在其中添加null安全运算符.请告诉我是否需要添加其他信息，因为我是Drools的新手.
Please let me know how to use ".?" (null safe operator) in drools decision table(Spreadsheet). Attached my spreadsheet, where for mdcl object I need to add null safe operator. Please let me know if I need to add additional information, as I'm new to Drools.
推荐答案
Drools中的空安全运算符为!.，而不是.?-请参见文档.您可以像在编写规则时一样在决策表中使用它.
The null-safe operator in Drools is !., not .? - see the documentation. You can use it inside decision tables just as you would when writing rules.
在您的示例中，将条件从mdcl.MDCL_Health.get("MDCL").Value更改为mdcl!.MDCL_Health.get("MDCL").Value以仅在mdcl不为null时触发规则.
In your example, change the condition from mdcl.MDCL_Health.get("MDCL").Value to mdcl!.MDCL_Health.get("MDCL").Value to only fire the rule if mdcl is not null.
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