Come Join Us!

Are you a
Computer / IT professional?
Join Tek-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Tek-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.


Jobs from Indeed

Link To This Forum!

Partner Button
Add Stickiness To Your Site By Linking To This Professionally Managed Technical Forum.
Just copy and paste the
code below into your site.

DBEXPRESS: Operation not allowed on unidirectional dataset

DBEXPRESS: Operation not allowed on unidirectional dataset

I put a datasource, sqlconnection, sqlquery and a dbgrid,
and when I try to change dbgrid datasource it tells me:
"Operation not allowed on unidirectional dataset"

What is the solution to this!

RE: DBEXPRESS: Operation not allowed on unidirectional dataset

I haven't used dbexpress, but have seen changing the datasource of a Tquery fail if the Tquery was not first made inactive.

RE: DBEXPRESS: Operation not allowed on unidirectional dataset

"Operation not allowed on unidirectional dataset"

A unidirectional dataset can only move through records in one direction, not back and forward.  A grid can move in both directions and so can't be connected to a unidirectional dataset.

You realy need to read the "Developers Guide", part II, 'Developing Database Applications', page 14-6.

To use a grid you need these components ...

This can also be achieved by using the TSQLClientDatSet which murges the first 3 components in the above list into 1.

Tim Dover

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Tek-Tips Forums free from inappropriate posts.
The Tek-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Tek-Tips forums is a member-only feature.

Click Here to join Tek-Tips and talk with other members!


Close Box

Join Tek-Tips® Today!

Join your peers on the Internet's largest technical computer professional community.
It's easy to join and it's free.

Here's Why Members Love Tek-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close