sequelize

2026-01-22 17:55:57 +01:00 · 2021-03-19 00:00:00 +00:00
parent 6efe2fb4e1
commit 0779d471c6
5 changed files with 400 additions and 1 deletions
--- a/README.adoc
+++ b/README.adoc
@@ -19363,7 +19363,7 @@ The horrendous downsides of this are:

 https://gensim.org

-https://bitbucket.org/gensim/gensim
+Source at: https://github.com/gensim-project/gensim previously at: https://bitbucket.org/gensim/gensim

 MIT licensed <<binary-translation>> simulator, so a bit like an MIT <<qemu>>.

--- a/rootfs_overlay/lkmc/nodejs/.nvmrc
+++ b/rootfs_overlay/lkmc/nodejs/.nvmrc
@@ -0,0 +1 @@
+v14.16.0
--- a/rootfs_overlay/lkmc/nodejs/package-lock.json
+++ b/rootfs_overlay/lkmc/nodejs/package-lock.json
@@ -0,0 +1,282 @@
+{
+  "name": "lkmc-nodejs",
+  "version": "1.0.0",
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+}
--- a/rootfs_overlay/lkmc/nodejs/package.json
+++ b/rootfs_overlay/lkmc/nodejs/package.json
@@ -0,0 +1,17 @@
+{
+  "name": "lkmc-nodejs",
+  "version": "1.0.0",
+  "description": "https://cirosantilli.com/linux-kernel-module-cheat#node-js",
+  "main": "alphanumeric.js",
+  "dependencies": {
+    "pg": "^8.5.1",
+    "pg-hstore": "^2.3.3",
+    "sequelize": "^6.5.1"
+  },
+  "devDependencies": {},
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "GPLv3"
+}
--- a/rootfs_overlay/lkmc/nodejs/sequelize.js
+++ b/rootfs_overlay/lkmc/nodejs/sequelize.js
@@ -0,0 +1,99 @@
+#!/usr/bin/env node
+
+// https://cirosantilli.com/sequelize
+//
+// Before running this:
+// * ensure that you can use peer authentication without password
+//   from the command line, i.e. `psql` works
+// * create the database for our test:
+//   ``
+//   createdb lkmc-nodejs
+//   ``
+
+const assert = require('assert');
+
+const { Sequelize, DataTypes } = require('sequelize');
+
+// To use the URI syntax, we need an explcit username and password.
+// But the second constructor works with peer authentication.
+// https://stackoverflow.com/questions/46207155/sequelize-and-peer-authentication-for-postgres
+//const sequelize = new Sequelize('postgres://user:password@localhost:5432/lkmc-nodejs')
+const sequelize = new Sequelize('lkmc-nodejs', undefined, undefined, {
+  host: '/var/run/postgresql',
+  dialect: 'postgres'
+});
+
+const IntegerNames = sequelize.define('IntegerNames', {
+  value: {
+    type: DataTypes.INTEGER,
+    allowNull: false
+  },
+  name: {
+    type: DataTypes.STRING,
+  },
+}, {});
+
+// OMG fuck this asynchronous bullshit:
+// https://stackoverflow.com/questions/39928452/execute-sequelize-queries-synchronously/43250120
+(async () => {
+
+// Connection sanity check.
+// https://stackoverflow.com/questions/19429152/check-mysql-connection-in-sequelize/31115934
+await sequelize.authenticate();
+
+// Create the database defined by `sequelize.define`.
+await IntegerNames.sync({force: true})
+// After this:
+//
+// psql lkmc-nodejs -c '\dt'
+//
+// gives:
+//
+//            List of relations
+//  Schema |     Name     | Type  | Owner
+// --------+--------------+-------+-------
+//  public | IntegerNames | table | ciro
+// (2 rows)
+//
+// and:
+//
+// psql lkmc-nodejs -c '\d+ "IntegerNames"'
+//
+// gives:
+//
+//   Column   |           Type           | Collation | Nullable |                  Default                   | Storage  | Stats target | Description
+// -----------+--------------------------+-----------+----------+--------------------------------------------+----------+--------------+-------------
+//  id        | integer                  |           | not null | nextval('"IntegerNames_id_seq"'::regclass) | plain    |              |
+//  value     | integer                  |           | not null |                                            | plain    |              |
+//  name      | character varying(255)   |           |          |                                            | extended |              |
+//  createdAt | timestamp with time zone |           | not null |                                            | plain    |              |
+//  updatedAt | timestamp with time zone |           | not null |                                            | plain    |              |
+// Indexes:
+//     "IntegerNames_pkey" PRIMARY KEY, btree (id)
+
+await IntegerNames.create({value: 2, name: 'two'});
+await IntegerNames.create({value: 3, name: 'three'});
+await IntegerNames.create({value: 5, name: 'five'});
+// psql lkmc-nodejs -c 'SELECT * FROM "IntegerNames";'
+//
+// gives:
+//
+//  id | value | name  |         createdAt          |         updatedAt
+// ----+-------+-------+----------------------------+----------------------------
+//   1 |     2 | two   | 2021-03-19 19:12:08.436+00 | 2021-03-19 19:12:08.436+00
+//   2 |     3 | three | 2021-03-19 19:12:08.436+00 | 2021-03-19 19:12:08.436+00
+//   3 |     5 | five  | 2021-03-19 19:12:08.437+00 | 2021-03-19 19:12:08.437+00
+// (3 rows)
+
+let integerNames = await IntegerNames.findAll({
+  where: {
+    value: 2
+  }
+});
+assert(integerNames[0].name === 'two');
+
+// Otherwise it hangs for 10 seconds, it seems that it keeps the connection alive.
+// https://stackoverflow.com/questions/28253831/recreating-database-sequelizejs-is-slow
+// https://github.com/sequelize/sequelize/issues/8468
+await sequelize.close();
+})();