How to Change DBGrid Row Value in Delphi

Discover how to effectively change `DBGrid` row values using Delphi. This guide covers how to update fields and transfer values between grids with ease.
---

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: How to change DBgrid row value?

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Change DBGrid Row Value in Delphi: A Step-by-Step Guide

Working with databases in Delphi can often lead to complex scenarios, particularly when you need to modify the values displayed in DBGrids. One common requirement is to change a selected row's value in the grid using external inputs, such as text from a TEdit control, or to transfer values between different grids. In this guide, we will walk you through the process of achieving these tasks in a clear and organized manner.

Understanding the Basics

Before diving into the code, let's clarify a few concepts:

DBGrid: A visual component in Delphi that allows you to display and manipulate database records.

TDataSource: Serves as a bridge between your database and the visual components, such as DBGrid and TDBEdit.

TEdit: A standard text input control where users can enter data.

Suppose you have a dataset connected to DB-aware controls like TDBEdit and DBGrid via a TDataSource.

Example Scenario

Let's assume you want to:

Update a specific column (for instance, index 5) of a DBGrid with the value obtained from a TEdit component when a button is clicked.

Transfer a value from one DBGrid to another, ensuring that the existing value is updated rather than replaced.

Step-by-Step Solution

1. Updating a Specific DBGrid Row Column

To change the desired field value in your dataset, you'd typically follow these steps:

Simple Update Example

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

More Optimal Code Approach

You can improve performance and avoid flickering in the UI by disabling control updating while making changes:

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

In this code, both the CustomerName and CustomerCountry fields are updated simultaneously, benefiting from better performance due to DisableControls and EnableControls.

2. Updating the DBGrid with TEdit Value

If you want to update a specific column in the selected row of the DBGrid with the value from a TEdit, use the following approach:

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

3. Adding Value from One DBGrid to Another

To add a value from one DBGrid to another (not replacing the existing value), follow these steps sequentially:

Fetch the value from the source DBGrid.

Update the target DBGrid’s field with the current value plus the new one.

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

Conclusion

In this guide, we explored how to effectively change DBGrid row values in Delphi by directly manipulating the underlying dataset. By using TEdit controls and leveraging the appropriate dataset methods, you can easily update and transfer values between grids without losing data integrity.

With these techniques, you should feel more comfortable managing data in your Delphi applications. Happy coding!