Getting a error on one to many relationships, with percona server Mysql 5.7

Hey 😃,

i just getting a error with this example https://eveningkid.github.io/denodb-docs/docs/guides/one-to-many with the percona server mysql 5.7

error: Uncaught Error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'alter table `businesses` add constraint `businesses_ownerid_foreign` foreign key' at line 2

throw new Error(error.message);

at Connection.nextPacket (https://deno.land/x/mysql/src/connection.ts:95:17)
    at async Connection.execute (https://deno.land/x/mysql/src/connection.ts:162:19)
    at async https://deno.land/x/mysql/src/client.ts:101:14
    at async Client.useConnection (https://deno.land/x/mysql/src/client.ts:111:22)
    at async Client.execute (https://deno.land/x/mysql/src/client.ts:100:12)
    at async Function._createInDatabase (https://deno.land/x/denodb/lib/model.ts:80:5)
    at async Database.sync (https://deno.land/x/denodb/lib/database.ts:94:7)

Is mysql 5.7 not supported, or is it a bug?

[prisis]

Hey 😃, thank you for the response 😃

I switched my db to arangodb and created a client for it, its fits better for my use case.

But if i start a new project i will try denodb again 😃

[eveningkid]

Hey Daniel,

I finally managed to get MySQL 5.7 — just like yours, running on my laptop 😃

I had the exact same issue and obviously decided to fix this (we’re engineers after all). Here were the issues:

• the MySQL driver couldn’t take multiple queries at once, I had to split them on ; (which was a similar behaviour with SQLite)
• a foreign key was an integer, but the actual primary key it was targeting was a string. So for sure MySQL couldn’t manage to link these two!
• dropping tables have to be the done in the right order, based on the foreign keys

So here’s the code that is now working on my side and hopefully will on yours too! 😃

import { DataTypes, Database, Model, Relationships } from "https://deno.land/x/denodb/mod.ts";

const db = new Database({ dialect: "mysql", debug: true }, {
  host: "localhost",
  username: "root",
  password: "",
  database: "mysql",
});

class Owner extends Model {
  static table = "owners";

  static fields = {
    id: {
      type: DataTypes.STRING,
      primaryKey: true,
    },
    name: DataTypes.STRING,
  };

  static businesses() {
    return this.hasMany(Business);
  }
}

class Business extends Model {
  static table = "businesses";

  static fields = {
    id: {
      type: DataTypes.STRING,
      primaryKey: true,
    },
    name: DataTypes.STRING,
    ownerId: Relationships.belongsTo(Owner),
  };

  static owner() {
    return this.hasOne(Owner);
  }
}

db.link([Owner, Business]);

await Business.drop();
await Owner.drop();

await db.sync();

await db.close();

I know this comes out of nowhere but I just wanted to let you know it’s now all fixed!

I hope you will give denodb another chance. Do not hesitate to raise any other issue, I now have MySQL to debug things out hehe

Keep in touch!