Not really a notion of SQL standard catalogs, which are called databasesīy most of the industry. With the same name as the MySQL database. You might have seen that the automated migration targets a PostgreSQL schema It is less error prone to query system’s catalogs than to learn how Pgloader needs a live MySQL database to operate its $ psql -d f1db -c 'ALTER DATABASE f1db SET search_path TO f1db, public ' Which means you need the following 3 commands if we wanted toīe exhaustive (the migration itself only happens at the pgloader step):
Also, currently pgloader doesn’tĬhange the search_path of the target database, so you might want to do To be complete, let’s mention that pgloader will not create the targetĭatabase, so you have to do that yourself. MySQL 5.1 database dump from there, install it in some MySQL instance and Motor racing data for non-commercial purposes. The Ergast database, a historical record of
You can easily reproduce that at home with Line: $ pgloader mysql:// /f1db pgsql:///f1db Require installing a trigger in PostgreSQL, all of that in a single command The ORM case: migrating to an existing schemaĪn example of pgloader simplicity is that you can migrate a whole MySQLĭatabase, including its schema definition of tables and indexes, primary keyĪnd foreign key constraints, comments and default values, even when they PostgreSQL allows you to create a UNIQUE constraint to a group of columns using the following syntax: CREATE TABLE table ( c1 data_type, c2 data_type, c3 data_type, UNIQUE (c2, c3) ) Code language: SQL (Structured Query Language) (sql) The combination of values in column c2 and c3 will be unique across the whole table. Tried the edited answer and upon posting with a duplicate email it does work and show the message but when posting it again with the same email, instead of showing the message the app crashes with this typeerror: "TypeError: Cannot read properties of undefined (reading 'rows')" const createStudent = (req, res) => ) Ĭonst error = new Error("Email Already Exists!") Ĭonst error = new Error("Something Went Wrong!") Previous Post Next Post Check for UNIQUE constraint in Node-Postgres
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