Скачать или смотреть Enhancing User Experience with SQLite in Delphi: Dynamic Dropdowns for Site Name Matching

Learn how to effectively use SQLite with Delphi to suggest possible site names based on user input, enhancing user experience in your applications.
---
This video is based on the question https://stackoverflow.com/q/64067394/ asked by the user 'Bob Baudewyns' ( https://stackoverflow.com/u/7755619/ ) and on the answer https://stackoverflow.com/a/64068017/ provided by the user 'fpiette' ( https://stackoverflow.com/u/189103/ ) 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: SQLite - TFDQuery with Delphi

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.
---
Enhancing User Experience with SQLite in Delphi: Dynamic Dropdowns for Site Name Matching

In today's world, ensuring a seamless and efficient user experience in applications is crucial, especially when it comes to data entry. One common issue developers face is ensuring that user input matches the expected format in a database. This guide will address a specific problem you might encounter in database management using Delphi and SQLite: how to dynamically suggest area names when posting a Work Order (WO) to a REST server. We will detail a solution that not only improves user experience but also ensures accurate data submission.

Background

Imagine you've created a local SQLite database to manage site names for a REST server. You have access to site names, and you want to allow users to correct or select site names that may not match exactly what is stored on the server. Here’s the challenge:

Input Variations: Users may input site names like "George 1", "George1", or "Georg 1."

Rejection Issues: If the input does not match stored site names 100%, the request to the server may be rejected, leading to user frustration.

To mitigate this, you can implement a dynamic dropdown list that suggests possible matches based on user input before submitting the Work Order.

Crafting the SQL Query

The first step is to properly configure the SQL query to fetch potential matches based on the input provided by the user. Your current SQL using the LIKE operator only returns exact or no matches. To get better results, you can modify your query.

Here’s how you can improve your query:

Instead of a simple condition, you will use the following SQL statement:

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

Key Components of the Query

Equality Check: The first part checks for an exact match using =.

Partial Matches: The second part uses LIKE with wildcards (the % symbol works like a placeholder) to catch variations that contain "George."

Implementing in Delphi

Now, let's translate this SQL solution into Delphi code. Here is a procedure you can implement in your Delphi application using the FireDAC component library:

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

Breakdown of the Code

Connection Setup: Establishes a connection to your SQLite database.

Query Preparation: Sets the SQL command with the appropriate parameters for exact and partial matches.

Result Handling: Retrieves site names and populates a visual element like a memo or dropdown for users.

Further Enhancements

If no matches are found after executing the above query, you can implement additional logic to query the address field to suggest all sites located in the street. This could involve an extra query like this one:

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

Conclusion

By implementing a dynamic search feature based on user input, you can significantly enhance the user experience when interacting with your database. Utilizing SQLite's flexible querying capabilities through Delphi allows your application to provide accurate suggestions, ensuring smooth data entry and reducing the likelihood of rejection.

With these improvements, users are more likely to submit correct Work Orders without frustration.

Now it's your turn to implement these changes, improve user interaction, and create a more seamless interface in your Delphi applications!