Question

我试图根据用户在Japser iReport网络界面上选择的值为我的WHERE子句添加一行。

Select KeyId, Name, WorkOrder
FROM orderTbl oT
WHERE

------- ????????????????? --------------

If userSelectedValue = 'Load'
        oT.workOrder = 'accepted'
End If

------- ????????????????? --------------

我尝试按照CASE示例，但是会创建一个包含结果的新列，但不知道如何使用新值来获取我想要的记录。

Select KeyId, Name, WorkOrder
case 
  when userSelectedValue = 'Load' and workOrder  ='accepted' then 'useWorkOrder'
     else 'noWorkOrder'
end as "dropDown",

dropDown          KeyId  Name           WorkOrder
----------------  -----  -------------  --------------
useWorkOrder      45     John Doe       accepted
useWorkOrder      78     Bill Kearns    accepted
noWorkOrder       23     Sandy York     null

My Final Goal:
Retrieve 2 records if user selects "Load" from a drop-down (userSelectedValue="Load")
- 45     John Doe 
- 78     Bill Kearns
Retrieve 1 record if user selects "Retrieve" from a drop-down (userSelectedValue="Retrieve")
- 23     Sandy York

Answer 1

您不必使用CASE。您可以使用复合条件：

SELECT KeyId, Name 
FROM orderTbl
WHERE (userSelectedValue = 'Load' and workOrder = 'accepted' AND DropDown = 'useWorkOrder')
OR    (DropDown = 'noWorkOrder');

Answer 2

您可以做的最简单的修改是：

Select KeyId, Name 
WHERE case 
  when userSelectedValue = 'Load' and workOrder  ='accepted' then 'useWorkOrder'
     else 'noWorkOrder'
end = 'useWorkOrder'

Answer 3

<强>解决方案：

我使用了所有想法的组合来实现这一目标。特别感谢Joseph B + gubble。

<强> 问题：

Select KeyId, Name, WorkOrder
FROM orderTbl oT
WHERE
If userSelectedValue = 'Load'
        oT.workOrder = 'accepted'
End If

<强> 答案：

Select KeyId, Name, WorkOrder
FROM orderTbl oT
WHERE
 case 
    when (oT.KeyId = userSelectedValue AND oT.workOrder = 'accepted'
          OR de.KeyId = userSelectedValue)
       then 'useWorkOrder'
       else 'noWorkOrder'
 end = 'useWorkOrder'

如果Else更改了Oracle中的where子句

3 个答案: