fishScript.com d
Home| Progetto| Web| Faq| Acronimi

Argomenti

Documenti pubblicabili:1120
Scripts:1282
Documenti non pubblicabili:162
Categorie tematiche:68
.Net
   |_C#
   |_Visual basic.net
   |_Asp.net
Active Server Pages
C++
Cascade Style Sheet
JavaScript
Mysql
Php
Xml
Java
   |_Java 2 Micro Edition
   |_Java server pages
   |_Java Servlet
Oracle
   |_PLSQL
PostgreSQL
Unix






PLSQL... Script: dbms_lob updating blob type


Basically, a web session can be defined as the timeframe in which a visitor navigates your web site.



XPath is a language for addressing parts of an XML document. It is designed to be used by XSLT and XPointer.

Basically, a web session can be defined as the timeframe in which a visitor navigates your web site.

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 ; 




Warning: include(ads/text468x15.html): failed to open stream: No such file or directory in D:\inetpub\webs\fishscriptcom\documents\view_document.php on line 131

Warning: include(): Failed opening 'ads/text468x15.html' for inclusion (include_path='.;C:\php\pear') in D:\inetpub\webs\fishscriptcom\documents\view_document.php on line 131

Tutorial
PostgreSQL determine database uptime   [PostgreSQL] 
Postgres check database is Master or Replica ways to check database replication role  [PostgreSQL] 
Ordering by highest or lowest value of multiple columns PostgreSQL functions in order by clause  [PostgreSQL] 
Posgresql how disable and renable foreign constraints forcing data into a table ignoring foreign keys (or trigger)  [PostgreSQL] 
Comandi
date and timestamp simple Using date and timestamp   [PostgreSQL] 
Add time to a date date function operation  [PostgreSQL] 
How set a default schema working away in your postgreSQL session  [PostgreSQL] 
postgres tip: how re-execute a query every n second a nice postgres shell command  [PostgreSQL] 
Grouping data by the week example date_trunc function, trimming days by the week  [PostgreSQL] 
How get PosgreSQL table size pg_total_relation_size function  [PostgreSQL] 
PostgreSQL determine database size pg_database_size function returns database size   [PostgreSQL] 
PostgreSQL enable autostart at reboot on Centos / Redhat Configure autostart after reboot  [PostgreSQL] 

signal Marco Magnani marcomagnani@fishscript.com



Cerca





A good scientist is a person with original ideas.
A good engineer is a person who makes a design that works with as few original ideas as possible. There are no prima donnas in engineering.
Freeman Dyson


A good scientist is a person with original ideas.
A good engineer is a person who makes a design that works with as few original ideas as possible. There are no prima donnas in engineering.
Freeman Dyson




Oracle... Definizioni: Variabile bind





fishScript.Com is accessible by Mobile access technology as mobile phones, Palm and Pocket PC .

Nicoleta e Marco Magnani tutorial, examples, courses, esempi, corsi, esercizi, appunti vari Dottoressa Nicoleta Dragu Formatrice Docente Insegnante Mediatrice Culturale Dott. Marco Magnani Universita La Sapienza Roma Master Computer Science Hunter College New York , Data Base Administrator DBA oracle System architect

Last modified: 2017-11-30 amministratore@fishscript.comNico and Marco Magnani Software Production
Home|About this Site © 2003-2008 www.fishScript.com ®