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PLSQL... Script: DYN SQL


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In programming the danger of exploring the small details of coding is that you get obsessed with every line of code you write, thereby greatly reducing productivity.
In general, is not worth obsessing over code.
On the other hand you should code with deliberation and intent. Steven Feurstein Oracle Magazine July /August 2004

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PostgreSQL

Home >PostgreSQL > Posgresql how disable and renable foreign constraints

Stampa  Stampa


I had to recover old table data, to do it quickly that I want to delete first the data contained and load from a backup. Cannot just delete the data because the table was linked with several foreign keys. In this case, the backup data are consistent with all the foreign keys, I just needed to disable the foreign keys temporarily to delete the rows. In PostgreSQL, the command: ALTER TABLE t DISABLE TRIGGER ALL; does not just disable all the triggeres table but also the foreign key constraints
-- Parent referenced table 
pgdb=# create table r (c char primary key );

-- Children referencing table 
pgdb=# create table t (c char primary key );
pgdb=# alter table  t add  FOREIGN KEY (c) REFERENCES r;

-- Due the foreign constraint can  insert on children table(t) only if the value is in the referenced table (r)
pgdb=# insert into r values ('a');
pgdb=# insert into t values ('a');

-- Obviously, cannot insert or delete data not in the parent table
pgdb=#  insert into t values ('b');
ERROR:  insert or update on table "t" violates foreign key constraint "t_c_fkey"
DETAIL:  Key (c)=(b) is not present in table "r".

-- In fact, nor deleting
pgdb=# delete from r;
ERROR:  update or delete on table "r" violates foreign key constraint "t_c_fkey" on table "t"
DETAIL:  Key (c)=(a) is still referenced from table "t".

-- 
pgdb=# ALTER TABLE  r  DISABLE TRIGGER ALL;
ALTER TABLE
pgdb=# delete from r;
DELETE 1

-- don't forget to renable it ...
pgdb=# ALTER TABLE  r  ENABLE TRIGGER ALL ; 




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signal Marco Magnani marcomagnani@fishscript.com



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Anger is creative, depression is useless.
Dyson, Freeman J.


Anger is creative, depression is useless.
Dyson, Freeman J.




Oracle... Definizioni: Set di caratteri (Characterset)


Shell scripting... Script: Looping samples



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