dhis2-devs team mailing list archive

[Jason Pickering <jason.p.pickering@xxxxxxxxx>]

It is best practice in all cases to ensure to you make a backup of your
database. Even with SELECT and DELETE, you may unknowingly make a typing
mistake. Anytime you start messing around with the database directly, ensure
you first make a backup, so that you can easily restore the database in case
you mess up something unintentionally.

Another trick is to use a "SELECT INTO " statement, to put all of the data
you are about to delete into a separate table, and then perform the delete
operation. This way, it is relatively easy to see what you have deleted and
restore it once again, without reverting to a complete backup restore.

Regards,
Jason


2011/9/12 Muhire Andrew <muhireandrew@xxxxxxxxx>

> Thank you all,
> Great Knut its rilly good to select first and then delete because it can
> cause problems in case i delete  the needed data.
>
>
>
>
> ------------------------------
>
>
> *Muhire Andrew
> *
> *HMIS/Ministry of Health*
> *andrew.muhire@xxxxxxxxxx*
> *God is my provider.*
>
>
> ------------------------------
> *From:* Knut Staring <knutst@xxxxxxxxx>
> *To:* Lars Helge Øverland <larshelge@xxxxxxxxx>
> *Cc:* Muhire Andrew <muhireandrew@xxxxxxxxx>;
> dhis2-users@xxxxxxxxxxxxxxxxxxx; dhis2-devs@xxxxxxxxxxxxxxxxxxx
> *Sent:* Monday, September 12, 2011 3:56 PM
> *Subject:* Re: [Dhis2-devs] Dear Dhis2 users how can i delete?
>
> As a rule of thumb, it is usually wise to do a SELECT before a DELETE, so
> that you are 100% sure you are not deleting data you really need.
>
> In this case:
>
> select * from datavalue_audit where dataelementid=<id>;
> select * from datavalue where dataelementid=<id>;
>
> Knut
>
> 2011/9/12 Lars Helge Øverland <larshelge@xxxxxxxxx>
>
> Hi Andrew,
>
> you need to remove the data with SQL in the database. Run:
>
> delete from datavalue_audit where dataelementid=<id>;
> delete from datavalue where dataelementid=<id>;
>
> and replace <id> with the dataelementid of the one you want to remove.
>
> You can then go ahead and delete the data element in the user interface.
>
>
>
> Lars
>
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> --
> Knut Staring
> Informatics, U. of Oslo
> http://hisp.uio.no
> +4791880522
>
>
>
>
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