如何在OOZIE工作流程中使用逻辑运算符 [英] how to use logical operators in OOZIE workflow

问题描述

我有一个oozie工作流程 我正在使用决策控制节点 在谓词中我想&&"两种不同的条件 我需要使用&&"在它们之间获得最终的TRUE/FALSE结果

i have a oozie workflow im using decision control node in the predicate i want to "&&" two different conditions and i need to use "&&" in between them for the final TRUE/FALSE result

我找不到此类条件的谓词语法

i dont find the predicate syntax for such conditions

我正在使用

 <decision name="comboDecision">
        <switch>
            <case to="alpha">
              ---------
            </case>
        </switch>
  </decision>

我想这样做=

<decision name="comboDecision">
        <switch>
            <case to="alpha">
             condition1 && condition2
            </case>
        </switch>
  </decision>

有人可以在语法方面帮助我吗?

can anyone help me with the syntax ?

推荐答案

我将通过一个示例对此进行解释.

I will explain this with an example.

让我们假设我们有一个Java动作(我们将此动作称为getAgeInfo)，该动作会输出一个人的年龄:

Let's assume that we have a Java action (we will call this action as getAgeInfo), which outputs age of a person:

'person.age': Age of the person

动作:

<action name='getAgeInfo'> 
    <!--Outputs 1 property: person.age: returns age of the person--> 
    <java> 
        ..........
    </java> 
    <ok to="makeClassification" /> 
    <error to="fail" /> 
</action>

下一个动作是makeClassification. 在makeClassification行动中，我们根据人的年龄将其分为孩子"，少年"，中年人"或老年人".

The next action is makeClassification. In makeClassification action, we classify a person into "child", "teenager", "mid-aged" or "senior-citizen", based on the person's age.

例如如果某人的年龄大于或等于(ge)12(并且)小于(lt)20，我们将该人分类为青少年，并且工作流程将转换为teenager动作.

For e.g. if a person's age is greater than or equal to (ge) 12 (and) less than (lt) 20, we classify that person as a teenager and the workflow transitions to teenager action.

下面是switch语句，它说明了"and"的使用:

Following is the switch statement, which illustrates use of "and":

<decision name="makeClassification"> 
    <switch> 
        <case to="child"> 
            ${wf:actionData('getAgeInfo')['person.age'] gt 0 &&
              wf:actionData('getAgeInfo')['person.age'] lt 12} 
        </case> 
        <case to="teenager"> 
            ${wf:actionData('getAgeInfo')['person.age'] ge 12 && 
              wf:actionData('getAgeInfo')['person.age'] lt 20} 
        </case> 
        <case to="mid-aged"> 
            ${wf:actionData('getAgeInfo')['person.age'] ge 20 && 
              wf:actionData('getAgeInfo')['person.age'] lt 50} 
        </case> 
        <case to="senior-citizen"> 
            ${wf:actionData('getAgeInfo')['person.age'] ge 50} 
        </case> 
        <default to="error"/> 
    </switch> 
</decision>

您可以在此处看到另一个示例: Oozie by Example ，它说明了gt(大于)，lt(小于)，逻辑或(||)，逻辑和(&&).

You can see another example here: Oozie by Example, which illustrates the use of gt (greater than), lt (less than), logical or (||), logical and (&&).

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