SSRS 报告 - IIF 声明问题答案

【问题标题】：SSRS Report - IIF statement QuestionSSRS 报告 - IIF 声明问题
【发布时间】：2011-02-02 20:52:14
【问题描述】：

做一个表达式我得到一个错误，有人可以在这里告诉我正确的语法吗？

=IIf(Fields!t_cpcp.Value ="310", "Purchased Material & Raw Material", Nothing)
=IIf(Fields!t_cpcp.Value ="320", "Manufacturing Direct Labor", Nothing)
=IIf(Fields!t_cpcp.Value ="325", "Subcontract Cost", Nothing)
=IIf(Fields!t_cpcp.Value ="330", "Engineering Direct Labor", Nothing)
=IIf(Fields!t_cpcp.Value ="340", "Manufacturing Labor O/H", Nothing)
=IIf(Fields!t_cpcp.Value ="345", "Engineering Labor O/H", Nothing)
=IIf(Fields!t_cpcp.Value ="350", "Material O/H", Nothing)
=IIf(Fields!t_cpcp.Value ="355", "Labor O/H Surcharge", Nothing)
=IIf(Fields!t_cpcp.Value ="360", "Subcontract Material Burden", Nothing)
=IIf(Fields!t_cpcp.Value ="MFD", "Manufactured Items", Nothing)

【问题讨论】：

有机会告诉我们错误是什么吗？
是一个表达式还是多个表达式？，因为您显示的表达式不止一个
嗯，我有一列返回一个值，并且基于该值，我希望表达式列显示上面查询中的值之一。所以它是一个。
我得到的错误是 BC30205，预期语句结束。但我认为总体上是错误的，不确定。
您需要 switch 语句或嵌套 iif 语句。

标签： sql if-statement ssrs-2008 reporting-services

【解决方案1】：

如果您希望这一切都在一个表达式中，您可能需要使用 SWITCH 语句：

=Switch(<condition>, <return value if true>, <next condition>, <return value if true>, ...)

switch 语句将返回第一个条件为真的值。使用您的示例，您可以尝试：

=Switch(Fields!t_cpcp.Value ="310", "Purchased Material & Raw Material",
        Fields!t_cpcp.Value ="320", "Manufacturing Direct Labor",
        Fields!t_cpcp.Value ="325", "Subcontract Cost",
        ...rest of them go here...)

【讨论】：

【解决方案2】：

另一种不太优雅的方法是嵌套 IIF 语句

=IIf(Fields!t_cpcp.Value ="310", "Purchased Material & Raw Material",IIf(Fields!t_cpcp.Value ="320", "Manufacturing Direct Labor",IIf(Fields!t_cpcp.Value ="325", "Subcontract Cost",IIf(Fields!t_cpcp.Value ="330", "Engineering Direct Labor",IIf(Fields!t_cpcp.Value ="340", "Manufacturing Labor O/H",IIf(Fields!t_cpcp.Value ="345", "Engineering Labor O/H",IIf(Fields!t_cpcp.Value ="350", "Material O/H",IIf(Fields!t_cpcp.Value ="355", "Labor O/H Surcharge",IIf(Fields!t_cpcp.Value ="360", "Subcontract Material Burden",IIf(Fields!t_cpcp.Value ="MFD", "Manufactured Items", Nothing))))))))))

您也可以在查询中执行您的逻辑：

CASE t_cpcp WHEN '310' THEN 'Purchased Material & Raw Material'
            WHEN '320' THEN 'Manufacturing Direct Labor'
            WHEN  ...    THEN ....
            ELSE ''
END as t_cpcp_DESC

【讨论】：