DROP TABLE IF EXISTS A; CREATE TABLE a (id int); CREATE or replace FUNCTION insert_and_return(int) RETURNS int AS $$ BEGIN INSERT INTO a VALUES ($1); RETURN $1; END; $$ LANGUAGE plpgsql; SELECT * FROM insert_and_return(10),A AS y; Above code has…
i have the following tables: tenants: tenantId (UUID) invoiceAddress (TEXT) packages: packageId needsInvoice tenants_and_packages: tenantsAndPackagesId tenantId packageId This is a M2N-Mapping between Tenants and Packages. What is the problem? I want to achieve the following "Check"-Logic. I want to make…
Node.js / Nest.js /Typeorm /postgresql my code is i have table farm | id | center_point type GeoJson | point type GeoPoints| It can save to database, Does it have another way to update before commitTransaction ** if Transaction fail…
I want to drop unused tables. I listed empty tables to make sure that tables not getting inserts and deletes (using such as temporary table) within 1 week. Is there way for checking if a table is not getting any…
I am beginning to understand how transaction and locks work in databases. So in a very higher-level understanding: BEGIN -- txID: 1234 UPDATE tbl_1 SET field = value WHERE id IN (1); -- for simplicity -- Locks acquired on rows…
From the documentation, my understanding is that when a ROLLBACK command is issued in a transaction, PostgreSQL typically employs the Write-Ahead Logging (WAL) mechanism to undo the changes made within that transaction. However, because changes made to UNLOGGED tables bypass…
I’m using Postgres and have a transactional method defined as follows: @Entity public class SomeEntity { // … } @Transactional(isolation = READ_COMMITED) public void persistUniqueAndSendEmail() { SomeEntity e = // … // Persis the entity to Postgres with a unique…
I try to do transactions on my project java, and I realise all transactions don't rollback the rows in DB. It's a local project (the DB was MySQL on phpmyadmin, all tables in innoDB). I try to do an insert…
When trying to use SERIALIZABLE transactions in PostgreSQL, I'm hitting very unexpected serialization failures on the simplest possible access patterns: SELECT row to see if it exists, and then INSERT when it doesn't. To set the background: --psql (14.10 (Ubuntu…
I have "user" table with 3 columns. This table has 2 records with value user_name user_age user_address Kelvin 18 New York Thomas 21 Paris The first transaction BEGIN ; SELECT u from "user" u where u.user_age > 10 limit 1…