Question

Delphi 2006 and MS SQL 2005

Asked by: Almatrodi


Hi.

i have to develop an application with MS SQL 2005. But, i don't know what is the best way to connect inside the Delphi 2006?.
is it necessary to use Core Lab?.

Abdurahman

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Asked On
2007-01-03 at 22:39:22ID22110440
Tags

delphi

,

sql

,

2005

,

2006

Topics

Delphi Programming

,

Delphi Database

Participating Experts
3
Points
150
Comments
5

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Answers

 

by: hidrauPosted on 2007-01-04 at 06:10:05ID: 18243036

You can use ADO to connect.

 

by: AlmatrodiPosted on 2007-01-04 at 06:45:07ID: 18243286


But is it the best one?.

 

by: hidrauPosted on 2007-01-04 at 06:53:24ID: 18243340

In my opinion , it is the better.

 

by: DaytonaDavePosted on 2007-01-04 at 17:45:24ID: 18248616

I always use the dbExpress components (SQLConnection, SQLQuery, etc.).  They seem to be a LOT faster than ADO.

When doing updates to tables or views I will typically use a ClientDataSet as well to simplify the update process.

David

 

by: Workshop_AlexPosted on 2007-01-08 at 08:20:16ID: 18267864

Combined with SQL Server, I personally would just use ADO since both are developed by Microsoft and thus perform quite well together. Unfortunately the ADO components provided by Delphi don't perform as well as they should so instead of using these components, I tend to just use the raw ADO API by importing the ADO type library in my project. The drawback is that you can't use the DB Aware controls this way but it has the best performance. Besides, combined with XML/XSLT and some other tricks, you can create quite interesting applications this way. That is, if you're a well-experienced Delphi/ADO Developer.

Personally, I like to use a document model for my project. Basically, this means that when the user starts the application, data is retrieved from the database server and stored in an in-memory XML file. Using MSXML and ClientDatasets I am able to work with this data and don't need any connection to the database until an update is absolutely required. When an update is required, I just synchronise the data in my XML with the database , resolving possible conflicts at that point.
The advantage of the document model is that a user could work offline with your application. The XML could be saved to a file on disk, emailed to another user and whatever more. Best of all, the user can undo any changes without these having immediate effects on the database.

The drawback is that you have to be careful with the data modifications. They don't have immediate effects so multiple users could technically be using the same data, making different modifications to it. It's not a model that is suitable for all projects. But in a project where you work e.g. with customer data, you could consider all data related to a single customer as one single document.

Anyway, the best solution strongly depends on what you're trying to build.

20120131-EE-VQP-002

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