CODEWITHSUNDEEP
jmeter
Dave Brady
Dave Brady

Reputation: 203

How to add unique to each request in JMeter

I'm having a JSON array with n number of elements like productName, productId. I would like to generate unique id in productId for each element and for each request. Currently, I'm reading productId from .csv file but for each request same productId is applied for all the elements. For example:

test.csv

productId
10
11
12
13
14

In JMeter it substitute like below for request 1:

[
    {
        "productName": "Apple",
        "productId": "10"
    },
    {
        "productName": "Apple",
        "productId": "10"
    },
    {
        "productName": "Apple",
        "productId": "10"
    },
    {
        "productName": "Apple",
        "productId": "10"
    }
]

request 2:

[
    {
        "productName": "Apple",
        "productId": "11"
    },
    {
        "productName": "Apple",
        "productId": "11"
    },
    {
        "productName": "Apple",
        "productId": "11"
    },
    {
        "productName": "Apple",
        "productId": "11"
    }
]

But the way I'm expecting is, first request should be

[
    {
        "productName": "Apple",
        "productId": "10"
    },
    {
        "productName": "Apple",
        "productId": "11"
    },
    {
        "productName": "Apple",
        "productId": "12"
    },
    {
        "productName": "Apple",
        "productId": "13"
    }
]

And second request should be like below and so on,

[
    {
        "productName": "Apple",
        "productId": "14"
    },
    {
        "productName": "Apple",
        "productId": "15"
    },
    {
        "productName": "Apple",
        "productId": "16"
    },
    {
        "productName": "Apple",
        "productId": "17"
    }
]

productId should generate with some random id for each request and apply random id for all the elements in the json. How can we achieve this in JMeter?

Upvotes: 1

Views: 1647

Answers (3)

Dmitri T
Dmitri T

Reputation: 168197

As per CSV Data Set Config documentation:

By default, the file is only opened once, and each thread will use a different line from the file. However the order in which lines are passed to threads depends on the order in which they execute, which may vary between iterations. Lines are read at the start of each test iteration. The file name and mode are resolved in the first iteration.

If you want to generate a random number you can just go for __Random() function which produces a random number within the given range:

[
    {
        "productName": "Apple",
        "productId": "${__Random(1,2147483647,)}"
    },
    {
        "productName": "Apple",
        "productId": "${__Random(1,2147483647,)}"
    },
    {
        "productName": "Apple",
        "productId": "${__Random(1,2147483647,)}"
    },
    {
        "productName": "Apple",
        "productId": "${__Random(1,2147483647,)}"
    }
]

More information on JMeter Functions concept: Apache JMeter Functions - An Introduction

Upvotes: 1

Janesh Kodikara
Janesh Kodikara

Reputation: 1841

Another solution could be using the __CSVRead function instead of CSV Data Set Config element.

Note :

  1. You will have to remove the column names. i.e. First row
  2. Ensure you have sufficient test data in the CSV file
[
    {
        "productName": "Apple",
        "productId": "${__CSVRead(productIds.csv,0)}${__CSVRead(productIds.csv,next)}"
    },
    {
        "productName": "Apple",
        "productId": "${__CSVRead(productIds.csv,0)}${__CSVRead(productIds.csv,next)}"
    },
    {
        "productName": "Apple",
       "productId": "${__CSVRead(productIds.csv,0)}${__CSVRead(productIds.csv,next)}"
    },
    {
        "productName": "Apple",
        "productId": "${__CSVRead(productIds.csv,0)}${__CSVRead(productIds.csv,next)}"
    }
]

Upvotes: 0

Janesh Kodikara
Janesh Kodikara

Reputation: 1841

You can generate a random unique number with JMeter function __UUID

Replace the productId with the following

${__UUID}

Example

[
    {
        "productName": "Apple",
        "productId": "${__UUID}"
    },
    {
        "productName": "Apple",
        "productId": "${__UUID}"
    },
    {
        "productName": "Apple",
        "productId": "${__UUID}"
    },
    {
        "productName": "Apple",
        "productId": "${__UUID}"
    }
]

Upvotes: 3

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