在Azure YAML中检查空对象类型参数 [英] Checking for null object type parameter in Azure YAML

问题描述

我正在设置构建模板，无法弄清楚可选对象类型参数的语法.在我的管道中，我这样调用模板:

I'm setting up a build template and can't figure out the syntax for an optional object type parameter. In my pipeline I'm calling the template like this:

stages:
- template: aspnet-core.yml@templates
  parameters:
    database:
      name: 'SomeDatabase'
      server: 'SomeServer'

我在模板中定义了这样的参数:

I have the parameter defined like this in the template:

parameters:
  database: null

我想在模板中进行类似的检查，以便可以有条件地运行任务:

I want to do a check like this in the template so I can run a task conditionally:

- ${{ if ne('${{ parameters.database }}', null) }}:

但是，它不喜欢if语句中的关键字null，而且我不知道如何表示它没有传入的事实.在这里我有什么选择?

However, it's not liking the keyword null in the if statement, and I don't know how to represent the fact that it wasn't passed in. What are my options here?

推荐答案

您可以使用以下表达式检查参数是否为空.对于下面的示例

You can use below expression to check if a parameter is empty. For below example

- ${{if parameters.database}}:

下面是我的测试模板和azure-pipeline.yml.

Below is my testing template and azure-pipeline.yml.

仅当database被评估为true时，脚本任务才会执行.我进行了测试，发现database: ""和database:将被评估为false.如果将其定义为database: {}，它将被评估为true.

the script task will only get executed when database is evaluated to true. I tested and found database: "" and database: will be evalutated to false. If it is defined as database: {}, it will be evaluated to true.

模板:deploy-jobs.yaml

Template: deploy-jobs.yaml

parameters:
  database: {}

stages:
- stage: buildstage
  pool: Hosted VS2017

  jobs:
  - job: secure_buildjob
    steps:
    - ${{if parameters.database}}:
      - script: echo "will run if database is not empty"
        displayName: 'Base: Pre-build'

azure-pipeline.yml:

azure-pipeline.yml:

stages:
- template: deploy-jobs.yaml
  parameters:
    database: ""

要在数据库为空时执行某些任务，可以使用以下语句:

To execute some tasks if database is empty you can use below statement:

 steps:
    - ${{if not(parameters.database)}}:
      - script: echo "will run if database is empty"
        displayName: 'Base: Pre-build'

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