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values, whether the local char type is signed or not. This is necessary for portability. Per discussion on pghackers around 9/16/00. |
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example.sql | ||
README.MAX | ||
step1.c | ||
step1.e | ||
step2.pl |
Here are general trigger functions provided as workable examples of using SPI and triggers. "General" means that functions may be used for defining triggers for any tables but you have to specify table/field names (as described below) while creating a trigger. 1. refint.c - functions for implementing referential integrity. check_primary_key () is to used for foreign keys of a table. You are to create trigger (BEFORE INSERT OR UPDATE) using this function on a table referencing another table. You are to specify as function arguments: triggered table column names which correspond to foreign key, referenced table name and column names in referenced table which correspond to primary/unique key. You may create as many triggers as you need - one trigger for one reference. check_foreign_key () is to used for primary/unique keys of a table. You are to create trigger (BEFORE DELETE OR UPDATE) using this function on a table referenced by another table(s). You are to specify as function arguments: number of references for which function has to performe checking, action if referencing key found ('cascade' - to delete corresponding foreign key, 'restrict' - to abort transaction if foreign keys exist, 'setnull' - to set foreign key referencing primary/unique key being deleted to null), triggered table column names which correspond to primary/unique key, referencing table name and column names corresponding to foreign key (, ... - as many referencing tables/keys as specified by first argument). Note, that NOT NULL constraint and unique index have to be defined by youself. There are examples in refint.example and regression tests (sql/triggers.sql). To CREATE FUNCTIONs use refint.sql (will be made by gmake from refint.source). # Excuse me for my bad english. Massimo Lambertini # # # New check foreign key # I think that cascade mode is to be considered like that the operation over main table is to be made also in referenced table . When i Delete , i must delete from referenced table , but when i update , i update referenced table and not delete like unmodified refint.c . I made a patch that when i update it check the type of modified key ( if is a text , char() i added '') and then create a update query that do the right think . For my point of view that policy is helpfull because i do not have in referenced table loss of information . In preprocessor subdir i have placed a little utility that from a SQL92 table definition, it create all trigger for foreign key . the schema that i use to analyze the problem is this create table A ( key int4 not null primary key ,...) ; create table REFERENCED_B ( key int 4 , ... , foreign key ( key ) references A -- );