How to concatenate character strings in step function for AWS Glue parameters?

Question

HI All,

I have a step function to call an AWS Glue job with below step definition:

```json
    "glue-redshift-call": {
      "Type": "Task",
      "Resource": "arn:aws:states:::glue:startJobRun.sync",
      "Parameters": {
        "JobName": "GlueJobRedshiftStoredProcCa-meJ8P3QMSC5p",
        "Arguments": {
          "--SQLStatement": "call dw_merge_vendor('TNG', 'ASENTINEL')"
        }
      },
      "Next": "post-processing"
    },
```
As shown above, SQLStatement parameter is hardcoded as `call dw_merge_vendor('TNG', 'ASENTINEL')` in this. But I need to make it dynamic, parameter based. As mentioned in [Step Function new features Blogpost](https://aws.amazon.com/blogs/aws/aws-step-functions-adds-updates-to-choice-state-global-access-to-context-object-dynamic-timeouts-result-selection-and-intrinsic-functions-to-amazon-states-languages/), I tried below syntax to make it dynamic, but it's not working. Would you be able to suggest the correct syntax if I am doing something wrong here?

```json
"Arguments": {
  "--SQLStatement": "States.Format('call dw_merge_vendor('{}', '{}'),  ', $.param1, $.param2)"
}
```

Accepted Answer

There are two issues with what you did. The first is that when you reference other variables or intrinsic functions, you need to append .$ to the key. The second is that when you need to include ' in the string, you need to escape them using \\. It should look like this:

```
"Arguments": {
"--SQLStatement.$": "States.Format('call dw_merge_vendor({}, {}),', $.param1, $.param2)"
}
 ```

If you need the params enclosed in ', you should use the following:
```
"Arguments": {
"--SQLStatement.$": "States.Format('call dw_merge_vendor(\'{}\', \'{}\'),', $.param1, $.param2)"
}
```

How to concatenate character strings in step function for AWS Glue parameters?

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