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Home -> Community -> Mailing Lists -> Oracle-L -> Re: Before insert trigger code
Hi,
You will run into "mutating error" if u try to implement it it before insert trigger.
You need to store the primary key value of the row that is being inserted into a temp_table using a row level trigger.
Then in the statement level trigger read the row that was inserted using the key value from the temp_table. Do the validation. If the validation detects "overlaps" then raise a exception which would also rollback the row that was inserted in the temp_table. if the validation did not detect any "overlaps" then delete the row that u inserted into the temp_table in the statement level trigger itself.
Hope this helps...
Regards
Rajagopal Venkataramany
On Mon, 27 Nov 2000 23:20:20 -0800, ORACLE-L_at_fatcity.com wrote:
> Dear all,
>
> I have a table by name image_master whose structure is as below:
>
> IMAGE_NAME NOT NULL
> VARCHAR2(60)
> TYPE NOT
NULL
> CHAR(1)
> START_DT NOT NULL
> VARCHAR2(8)
> EXPIRY_DT
> VARCHAR2(8)
> IMAGE_DESC
> VARCHAR2(600)
> CREATE_DT
> VARCHAR2(8)
> MODIFY_DT
> VARCHAR2(8)
>
> The dates are entered in the form 'yyyymmdd'. All the dates have been
> assigned the datatype as varchar2(8) instead of date for a specific
reason.
> I would like to create a before insert trigger on the table so that the
> user cannot insert a record if the start_dt and expiry_dt overlap the
> existing start_dt and expiry_dt in the existing records. For example,
if
> there is a record whose start_dt is 20001126 and end_dt is 20001128 then
> the user is not allowed to have start_dt and end_dt between 26th and 28th
> November, 2000 (both dates inclusive). His start_dt and end_dt can be
any
> dates apart from 26th, 27th and 28th November. How do I implement this
> using SQL or PL/SQL? Is there any other way out apart from creating a
> before insert trigger? I hope I am clear. Any help in this regard will
> be highly appreciated.
>
> TIA and regards,
>
> Ranganath
>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author:
> INET: RanganathK_at_lgcommerznow.com
>
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Regards
Rajagopal Venkataramany
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