3/31/2023 0 Comments Aws postgresql uriProblem: Dynamic DB connection based on the user request not during app initialisation i found more peoples tried this but nothing is solid evidence. May be a new tutorial post that will help all people who fell in the same category. so, here i am posting this to expect answers and some suggestions from your side as theoretical and sample code. i heard something about connection pool concept in sequelize that's may be related to my case. so, i created another db and tried to perform dynamic connection based on user request but nothing helped me so, it's remained unsolved. from this tutorial i found the database connection is established during the app initialisation.so, to solve my case i need to establish the database connection dynamically based on the user request to their individual DB and need to perform CRUD operations ( Note : concurrent operations need to perform on their own db without disturb others ). so, in my case i am need to work with " 'n' no of databases ". so every client organisations need to have their own Databases. Here i am working based on Multi-Tenant Architecture. Here I am new to nodeJs so i came up with idea's with some doubts (may be old but i found as a beginner i got nothing from stackoverflow). Looking at the code used for the article, sayĪwesome tutorial for beginners who they are just like me. So what I do is to define the model relationship in the models, this will do the same job of associating the tables as defining the FK constraint in the migrations in addition to ensuring flexibility in interacting with the tables/models. Of course, enforcing the FK constraint ensures data integrity but the opportunity cost most time for me is higher. In deleting, you cannot delete a parent table if it has a child (this is a good feature btw). This is because foreign key constraints demand that the parent table's migration must precede the child table. Adding the foreign key constraints in the migrations makes integration with the models very rigid and most times it can be a pain.įrom my experience enforcing foreign key constraints in the migrations is good if only at the time of writing the migration you have completely figured out all the models and the relationships that exist between them. Hi Jakub, I deliberately did not add the foreign key constraints in the migrations. Thanks to the author for this article, it's been handy in starting with Sequelize :) Like comment: Like comment: 5 likes So you are good to go.Īs an overall style, I'd advise using a more semantic/ component-like folder structureĪlso, that repo I just linked, is filled with gold in all kinds of NodeJS knowledge! You can either change your password, removing those symbols, or URL encode your password (you can use encodeURIComponent('pass#word')). If your password contains certain symbols (like #, / etc.), it can mess up the parsing. ![]() Īnother gotcha can be "ERROR: getaddrinfo ENOTFOUND postgresroot" (or similar error). Up: async (queryInterface, Sequelize) => await queryInterface.bulkInsert('Users'. If seeding the DB you get "ERROR: Migration xxxx-User.js (or wrapper) didn't return a promise", you can add async/await (since all async functions return a promise) like so: exports = db //models/index.jsĪ couple of things for newcomers like me who will run into some issues following the code as it is here. NODE_ENV || ' development ' const config = envConfigs const db = ) db. basename ( _filename ) const env = process. config/config ' ) const basename = path. ![]() At the root folder of the project, run the following commands to install the necessary dependencies:Ĭonst fs = require ( ' fs ' ) const path = require ( ' path ' ) const Sequelize = require ( ' sequelize ' ) const envConfigs = require ( '. If you have not created an express project, quickly do so and open the project in a terminal.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |