PostgreSQL Checking for NEW and OLD in a function for a trigger
2 Answers The usual approach to make a trigger function do different things depending on how the trigger was fired is to check the trigger operation through TG OP CREATE OR REPLACE FUNCTION update table count RETURNS trigger AS DECLARE updatecount INT BEGIN if tg op UPDATE then select count into updatecount from source table
PostgreSQL Documentation 16 CREATE TRIGGER, Description CREATE TRIGGER creates a new trigger CREATE OR REPLACE TRIGGER will either create a new trigger or replace an existing trigger The trigger will be associated with the specified table view or foreign table and will execute the specified function function name when certain operations are performed on that table To replace the current definition of an existing trigger use
PostgreSQL CREATE TRIGGER Statement By Practical Examples
Summary in this tutorial you will learn how to use the PostgreSQL CREATE TRIGGER statement to create a trigger To create a new trigger in PostgreSQL you follow these steps First create a trigger function using CREATE FUNCTION statement Second bind the trigger function to a table by using CREATE TRIGGER statement If you are not familiar with creating a user defined function you can
Assign to NEW by key in a Postgres trigger, First of all there is no trigger body unlike Oracle In Postgres you have a trigger function also misleadingly called procedure with a function body and 0 n triggers without body calling this function The special variable NEW in plpgsql trigger functions is neither a map nor an array it s a record holding the new row NEW Data type RECORD variable holding the new database
PostgreSQL Documentation 13 9 28 Trigger Functions
PostgreSQL Documentation 13 9 28 Trigger Functions, Trigger Functions While many uses of triggers involve user written trigger functions PostgreSQL provides a few built in trigger functions that can be used directly in user defined triggers These are summarized in Table 9 97 Additional built in trigger functions exist which implement foreign key constraints and deferred index constraints
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Everything you need to know about PostgreSQL triggers EDB
Everything you need to know about PostgreSQL triggers EDB The EDB Docs Webinars A trigger is defined as any event that sets a course of action in a motion In PostgreSQL if you want to take action on specific database events such as INSERT UPDATE DELETE or TRUNCATE then trigger functionality can be useful as it will invoke the required function on defined events
Use PostgreSQL Triggers To Automate Creation Modification Timestamps
1 Answer You need to assign the RECORD type before sending it as parameter and a very simple way to do that in your case would be simple assigning it to NEW or OLD even when it wouldn t be necessary like CASE TG OP WHEN INSERT THEN old v NEW new v NEW WHEN UPDATE THEN old v OLD new v NEW WHEN DELETE THEN old v OLD new v Pass OLD NEW to a function Database Administrators Stack Exchange. Next 39 1 Overview of Trigger Behavior A trigger is a specification that the database should automatically execute a particular function whenever a certain type of operation is performed Triggers can be attached to tables partitioned or not views and foreign tables A trigger is a named database object that is associated with a table and it activates when a particular event e g an insert update or delete occurs for the table views The statement CREATE TRIGGER creates a new trigger in PostgreSQL Here is the syntax
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