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How to write trigger on a table which insert record in itself.

How to write trigger on a table which insert record in itself.

How to write trigger on a table which insert record in itself.


 I am facing some problems while writting database trigger in
 Firebird database.
 My basic requirement is to insert record into table on which i am
 writing update trigger.
 In Oracle i have written row leve trigger and statment level
 to achieve this.
 Ex :
 Say I want to insert record into TABLE1 on update of same table.
 on update of TABLE1 i am going to insert record in PL/SQL package
 which will be used to AFTER UPDATE STATEMENT LEVEL trigger on same
 table to insert record into TABLE1.

 Same thing i want in interbase/Firebird. I would like to know how
 it can be acheived?

 I have tried in interbase by writing
 AFTER UPDATE TRIGGER on TABLE1 and tried to insert record with old
 values on TABLE1

   create trigger upd... for TABLE1 ...

 But on update of TABLE1 it goes on updating and never terminate.
 May be it goes into infinite loop. Ultimately i have to stop the
 firebird service . otherwise it go on increasing database file
 I would highly appreciate if you can suggest me any good

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