How to Update Data in SQLite Using Flutter: A Guide for Developers

Learn how to effectively update data in SQLite with Flutter. This comprehensive guide walks you through incrementing values in a filtered list of products and how to ensure each value updates correctly.
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How to Update Data in SQLite Using Flutter: A Guide for Developers

Are you working on a Flutter application that uses SQLite for data storage? If so, you may encounter challenges when updating individual data records. Many developers face the issue of unintentionally altering all relevant data at once rather than updating each record separately. In this article, we will explore how to effectively update data in SQLite using Flutter, with a special focus on incrementing values correctly.

The Problem

Imagine you have a list of products stored in a SQLite database, with each product represented as a map. You want to filter these products based on a specific property—in this case, those marked as selected. After filtering, your goal is to increment the value of each product marked as selected and reset its price to 0.0. However, you may run into an issue where all products are updated to the same value instead of updating individually.

Here’s an example of the initial product data you might be working with:

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

When trying to update the selected products using a loop, you might find that all products reflect the same incremented value, for example, 4.

The Solution

The issue arises because when executing your update operation, you fail to specify which product should be updated specifically. Instead of updating all selected products at once, you should target each product individually using a more specific condition for your WHERE clause.

Step-by-Step Breakdown

Set up the function to get selected data:

You already have a static function to fetch products that are selected:

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

Modify the update function for specificity:

Update each selected product with its specific name to avoid updating every selected product at once. Here’s an optimized version of your _updateSelectedProd() method:

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

Summary

By making the update statement more specific, you ensure that you target the correct product for each update. Instead of updating all selected products together, each product is modified individually based on its unique properties.

Key Takeaways

Always target specific records: Understand the importance of precise where clauses in your SQL queries.

Avoid using forEach with async: Use a regular for loop or map to handle asynchronous operations better.

Test your updates: Assure that each product's value is correctly incremented according to your requirements.

With this guide, you should now have a solid foundation for updating data in SQLite using Flutter. Happy coding!