Postgresql trigger example update

This approach still records the full audit trail of changes to the table, but also presents a simplified view of the audit trail, showing just the last modified timestamp derived from the audit trail for each entry. 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. The current time and user name are recorded, together with the type of operation performed, and the view displays the last modified time of each row.

One use of triggers is to maintain a summary table of another table. The resulting summary can be used in place of the original table for certain queries — often with vastly reduced run times. This technique is commonly used in Data Warehousing, where the tables of measured or observed data called fact tables might be extremely large.

AFTER triggers can also make use of transition tables to inspect the entire set of rows changed by the triggering statement. This example produces the same results as Example This can be significantly faster than the row-trigger approach when the invoking statement has modified many rows. But this does not stop us from using a single trigger function if we choose. Data type text ; a string representing the event the trigger is fired for.

Data type text ; variable that contains the command tag for which the trigger is fired. If you see anything in the documentation that is not correct, does not match your experience with the particular feature or requires further clarification, please use this form to report a documentation issue. Development Versions: devel. Unsupported versions: 9. Trigger Functions Prev Up Chapter Row-level and statement-level triggers are two main important types of PostgreSQL triggers.

It always refers to a function that was triggered automatically when the event occurs on database tables or views. You may also have a look at the following articles to learn more —. Submit Next Question. By signing up, you agree to our Terms of Use and Privacy Policy. Forgot Password? This website or its third-party tools use cookies, which are necessary to its functioning and required to achieve the purposes illustrated in the cookie policy.

Hey, I have around tables and i want to make triggers on all tables. In short i will make triggers. Its lot of cosuming time. Is there any other way to make trigger via function or store procedure?

If u have any idea please share with me. Hi, I want to get Client IP address through database trigger when i logon in the application server. This command, when i connect through toad or sql plus it will show me Client IP Address. I wish to write a generalized trigger to record updations made to any of the tables in terms of: 1. Timestamp 6. Kindly provide help. Hi I have one table with 25 fields now I want to update in log table if the value of 25 fields are changed.

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