Parsing a Nested List JSON in Oracle PL/SQL Apex Made Easy

Discover how to efficiently parse a nested JSON list in Oracle PL/SQL Apex and print email addresses using a loop.
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How to Parse a Nested List JSON in Oracle PL/SQL Apex

Working with JSON in Oracle PL/SQL Apex can sometimes be tricky, especially when dealing with nested structures. If you've ever found yourself struggling to extract specific values from a nested JSON list, you're not alone. In this guide, we'll go through an example of parsing a nested list JSON object in Oracle PL/SQL and extracting data while walking through the process step-by-step.

The Problem

You may encounter a scenario where your JSON structure is complex, containing arrays and nested objects. For instance, let's look at the following JSON structure:

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Challenge

The goal is to extract and print the address values from the ccRecipients array. Many developers face challenges doing this correctly due to the structure of the JSON.

The Solution

Here's a detailed breakdown of how to parse the nested JSON and retrieve the email addresses:

1. Set Up Your Environment

Before diving into the code, ensure that the server output is enabled, and you are ready to capture any output from your PL/SQL block:

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2. Declare Necessary Variables

You need to declare variables to hold your JSON data and any values you extract:

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3. Define Your JSON Input

Assign your JSON string to the l_json_text variable. This string should match the JSON structure we're working with:

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4. Parse the JSON

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5. Loop Through the ccRecipients Array

To extract the email addresses, iterate over the ccRecipients array. Make sure to access the first element in the value array by specifying the index [1]:

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6. Execute Your Code

Run the entire PL/SQL block in Oracle Apex, and you can expect the following output:

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Conclusion

Parsing nested JSON structures in Oracle PL/SQL Apex may seem daunting at first, but with the right approach, it's quite manageable. By properly utilizing the built-in apex_json package and following a structured methodology, you can easily extract the data you need.

Armed with this knowledge, you can confidently work with JSON data in your applications, ensuring a smooth flow of information between your services.

If you find this helpful or have any questions, don’t hesitate to reach out or leave a comment!