How to Modify JSON Array Values in PL/SQL Using Just the Value

A detailed guide on how to change a value in a JSON array in PL/SQL when you only know the existing value and the new value.
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How to Modify JSON Array Values in PL/SQL Using Just the Value

Working with JSON data in Oracle’s PL/SQL can sometimes present challenges, especially when you're required to change a specific value within a JSON array without knowing its corresponding key. In this guide, we’ll guide you through the process of modifying a JSON array where you want to change a value of '4444' to '7727', while only having the old value and the new value in hand.

The Problem

Imagine you have a JSON array that looks like this:

[[See Video to Reveal this Text or Code Snippet]]

You want to replace '4444' with '7727' but have no keys to identify the value’s position. This situation, while tricky, can be handled effectively using PL/SQL's built-in JSON functions.

The Solution

To effectively modify a value within a JSON array using PL/SQL, we will create a function that will iterate through the array, searching for the old value and replacing it with the new one upon finding it. Below are the detailed steps necessary to perform this modification.

Steps to Modify the JSON Array

Parse the JSON Array: Begin by parsing the JSON array using the JSON_ARRAY_T.parse function.

Iteration: Use a loop to iterate over each element in the JSON array until you find the value you want to modify.

Check for the Old Value: Inside the loop, compare each element with the old value ('4444' in this case).

Replace the Value: When the old value is found, use the put method to replace it with the new value ('7727').

Output the Result: Finally, output the modified JSON array to verify the changes made.

Example Function

Here’s an example function that follows the steps outlined above:

[[See Video to Reveal this Text or Code Snippet]]

Breakdown of the Code

Initializing JSON Array: nmr_cmpt_json := JSON_ARRAY_T.parse(nmrs_cmpts_tab); initializes and parses the JSON array.

Loop Control: The loop statement allows us to cycle through the array. We exit the loop when we've checked all elements.

Conclusion

Modifying JSON array values in PL/SQL when you only have the values and not keys can seem challenging. However, with the use of loops and JSON methods, you can easily accomplish this task. By following these steps, you’ll be able to maintain and update your JSON data effectively and efficiently.

With practice, handling JSON in PL/SQL will become second nature, allowing you to build more interactive and dynamic applications. Happy coding!