Скачать или смотреть How to Update XML Column in SQL Server Recursively

Learn how to update XML columns in SQL Server by adding new nodes to your XML data recursively using XQuery.
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This video is based on the question https://stackoverflow.com/q/69727258/ asked by the user 'Helen Araya' ( https://stackoverflow.com/u/3038042/ ) and on the answer https://stackoverflow.com/a/69727682/ provided by the user 'Yitzhak Khabinsky' ( https://stackoverflow.com/u/1932311/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Introduction: Updating XML Columns in SQL Server

Managing XML data within SQL Server can be quite tricky, especially when you want to make updates recursively. If you’re working with a SQL Server 2012 database and need to insert a new node called TextReadingId into an existing XML structure, this guide will guide you through the steps to achieve that effectively.

Imagine you have a table, tblStepList, that holds an XML column, Data, organized in a nested structure. You may need to enhance your XML data by appending a new node for every Step with sequential identifiers for each TextReadingId. This guide will walk you through the provided solution to manage this complex update with ease.

Problem Breakdown

Existing Table Structure

The existing structure of your table is as follows:

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The Data column contains XML data that may look something like this:

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Goal

Your aim is to update each XML entry by adding a TextReadingId node with numbering that increments with each Step. The updated XML should resemble this:

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Solution: Update XML Column Using XQuery

Step-by-Step Implementation

To implement the recursive update of the XML column, you can use SQL’s XQuery capabilities efficiently as outlined below:

Prepare Your Environment:
Make sure you have the correct database context and your table set up.

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Verify Initial Data:
Check the current state of tblStepList to ensure the data is inserted correctly.

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Perform the Update:
Use the following SQL query with XQuery to update your XML data by inserting the TextReadingId.

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Review the Updated Data:
After performing the update, select the table again to confirm that the TextReadingId nodes have been added as expected.

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Conclusion

By following the steps above, you will successfully update your XML columns in SQL Server 2012, adding new nodes recursively with unique identifiers. This method utilizes the power and flexibility of XQuery, enabling efficient and clean data manipulation within your XML structures. Happy coding!