PostgreSQL event trigger example First, create a table called audits to store audit logs for commands: CREATE TABLE audits ( id SERIAL PRIMARY KEY, username VARCHAR(100) NOT NULL, event VARCHAR(50) NOT NULL, command TEXT NOT NULL, executed_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ); The audits...
In the above syntax, the language used to create the trigger function is PL/pgSQL but we can create it using any of the languages supported by PostgreSQL. The trigger function gets the information about its calling event through TriggerData, which contains some set of local variables. For ex...
Creating a Trigger in psql: Open a psql session and connect to your PostgreSQL database.For installation and establishing connection refer to PostgreSQL-How to create a database?Make sure you have created a table in your database previously.For creating a table refer to PostgreSQL-How to create...
This example uses a trigger on the view to make it updatable, and ensure that any insert, update or delete of a row in the view is recorded (i.e., audited) in the emp_audit table. The current time and user name are recorded, together with the type of operation performed, and the ...
PostgreSQL Trigger: Example BEFORE INSERT In the following example, before insert a new record in emp_details table, a trigger check the column value of FIRST_NAME, LAST_NAME, JOB_ID and - If there are any space(s) before or after the FIRST_NAME, LAST_NAME, LTRIM() function will remov...
Triggers in PostgreSQL Trigger types The return value of a trigger function NEW and OLD in row level triggers Example an auditing row level trigger Simplification of the row level trigger function Conclusion In this article, I'll talk about row level triggers, which are the most frequently use...
One of the missing features in PostgreSQL’s implementation of triggers was that DDL could not be detected very reliably. With the concept of event triggers introduced in v. 9.3, this is now possible.
An example to be inserted from acsvfile: numus proftoit profbase ...100.3520.350.730.72.342.32.852.83.7 The functionmaj_alti_us_test()has to fill the fieldaltitoit(in mytable) like this: num proftoit altitoit52.8012.7542.3015.5530.7017.8520.3518.5510.0018.90 ...
PostgreSQL ALTER TRIGGER example First, create a new table called employees: DROP TABLE IF EXISTS employees; CREATE TABLE employees( employee_id INT GENERATED ALWAYS AS IDENTITY, first_name VARCHAR(50) NOT NULL, last_name VARCHAR(50) NOT NULL, salary decimal(11,2) NOT NULL DEFAULT 0, PRIMARY...
Here, I describe what the return value of a PostgreSQL row level trigger function means and suggest a useful code simplification for such functions.