Скачать или смотреть How to Safely Update a Table Using JSON_OBJECT_T Elements in Oracle?

Learn how to resolve the ORA-40573 error when updating database tables with JSON_OBJECT_T in Oracle's PL/SQL. Solutions and workarounds provided for efficient data management.
---
This video is based on the question https://stackoverflow.com/q/62353653/ asked by the user 'Teabubblez' ( https://stackoverflow.com/u/12298265/ ) and on the answer https://stackoverflow.com/a/62441078/ provided by the user 'Teabubblez' ( https://stackoverflow.com/u/12298265/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: (ORA-40573) Updating Table using JSON_OBJECT_T elements?

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Safely Update a Table Using JSON_OBJECT_T Elements in Oracle?

Updating database tables can sometimes lead to unexpected challenges, particularly when dealing with JSON data formats in Oracle's PL/SQL. One such common issue is the ORA-40573: Invalid use of PL/SQL JSON object type error that occurs when one attempts to directly manipulate JSON_OBJECT_T elements during an insert or update operation. In this guide, we will explore the problem in detail and discuss a workaround to effectively resolve this issue.

Understanding the ORA-40573 Error

When working with JSON_OBJECT_T in Oracle, you may encounter the ORA-40573 error. This indicates that you're trying to use the JSON object type in an inappropriate manner. Here’s a breakdown of the error scenario you may find yourself in:

The Problem

JSON_OBJECT_T Definition: This is a PL/SQL type that allows you to work with JSON data structures.

Insert Statement Usage: Attempting to directly use elements from a JSON_OBJECT_T within an INSERT statement can trigger the ORA-40573 error.

Example Code Fragment:

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

In this example, the insertion of metadata.get_String('objtype') directly in the VALUES clause is what raises the error.

Exploring the Workaround

Although there hasn't been a patch released for this specific issue, a workaround has been suggested. Here’s how you can effectively bypass the ORA-40573 error:

Step-by-Step Solution

Declare Variables: Instead of directly using the JSON_OBJECT_T elements in your SQL command, first set up PL/SQL variables to hold the necessary values.

Retrieve Data: Assign the JSON values to these variables using the methods provided by the JSON_OBJECT_T.

Use Variables in Insert Statement: Finally, use these variables in your SQL statement instead of the JSON_OBJECT_T object itself.

Example Code Representation

The following code demonstrates this approach:

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

Key Benefits of This Workaround

Avoids Errors: Prevents the ORA-40573 error from occurring.

Clearer Code: Increases the readability of your code by segregating data retrieval from data insertion.

Flexible Management: Allows for easier adjustments in the future if the structure of the JSON or the table changes.

Conclusion

While encountering the ORA-40573 error can be frustrating, understanding the problem and implementing the suggested workaround can save you time and improve your programming efficiency. By declaring PL/SQL variables to handle JSON data before using them in your SQL statements, you can successfully avoid this error and streamline your database operations.

Happy coding, and thank you for reading!