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LetsDevOps: Azure Bicep -> Data types, Parameters and Variables, How to use in bicep template.

Introduction

In this blog we will learn data types, parameters and variables and how to use them effectively in bicep template.


  • Data Types

  • Parameters

  • variables



Data Types



Data Types Syntax


Arrays

Define under [ ]

param numberArray array = [1, 2, 3]

boolean

param issetting bool = true

int

param vmcount int = 1

string

param staccountname string = 'demotest'

object

Define under { }

param mixedObject object = {name: 'test name', id: '123-abc'}

output accessorResult string = environmentSettings['dev'].name

Secure String/Object

Value of the parameter isn't saved to the deployment history and isn't logged.

@secure()
param password string 

Parameters

Parameters helps to provide information to a Bicep template at deployment time. It also helps in making the flexible and reusable bicep template.


Declare Parameter

param <parameter-name> <parameter-data-type>

param staccountname string

Add a default value

param staccountname string = 'st-demo0103'

Parameters Type Format


Here is the example for all data types in while defining parameters.json

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentParameters.json#",
  "contentVersion": "1.0.0.0",
  
  "parameters": {
    "exampleString": {
      "value": "test string"
    },
    "exampleInt": {
      "value": 4
    },
    "exampleBool": {
      "value": true
    },
    "exampleArray": {
      "value": [
        "value 1",
        "value 2"
      ]
    },
    "exampleObject": {
      "value": {
        "property1": "value1",
        "property2": "value2"
      }
    }
  }
}


Decorators

@description('Must be at least 3 Characeters.')
@minLength(3) 
@maxLength(24)
param storageAccountName string

@allowed([   
'dev'
'test'
'prod'
])
param environment string


Variables

You use variables to simplify your Bicep file development.


A variable can't have the same name as a parameter, module, or resource.


Define variable


var <variable-name> = <variable-value>

Use variable

param rgLocation string
param storageNamePrefix string = 'STG'

var storageName = '${toLower(storageNamePrefix)}${uniqueString(resourceGroup().id)}'

UseCase

Create storage account with parameter/variables.



Demo




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