TypeScript Lab: Technology JOIN Explorer

LAB / EXPLORATION

TypeScript Lab: Technology JOIN Explorer

Planned

LAB 054 — SQLite & Data Access
Visualize records joining through record_technologies to technologies.

LAB TypeScript Lab: Technology JOIN Explorer Preview coming soon

LAB 054

TypeScript Lab: Technology JOIN Explorer

Concept

JOIN follows foreign keys across a many-to-many relationship.

Concept

JOIN follows foreign keys across a many-to-many relationship.

Objective & Explanation

What the project should make visible and why the concept matters.

Learning Target

Objective

Visualize records joining through record_technologies to technologies.

Explanation

JOIN follows foreign keys across a many-to-many relationship.

Project Plan

Structure, technologies, data boundary, and source connection.

Structure

project/
├── package.json
├── tsconfig.json
├── index.html
├── styles.css
├── data/
│   └── learning.db
└── src/
    ├── client.ts
    └── server.ts

Technologies

TypeScript
Node.js
SQLite
HTML
CSS

Data Layer

Use SQLite learning rows. Isolate destructive practice from important Sandbox records.

Sandbox Source

src/datastore/queries.ts → getTechnologiesForRecord()

Build Instructions

Build only the focused behavior, then use the visual layer to inspect it.

Setup

Create the standalone project folder and listed files.

Implement

Implement the smallest version that demonstrates the concept.

Run & Inspect

Render the returned or changed data in the browser.

Code & Configuration

Starter configuration plus the focused implementation example.

Focused TypeScript

Implement this behavior first, then alter the input.

const rows = database.prepare(`
  SELECT technologies.name
  FROM technologies
  JOIN record_technologies
    ON technologies.id = record_technologies.technology_id
  WHERE record_technologies.record_id = ?
`).all(recordId);

Starter Configuration

Keep the project independently buildable.

package.json

{
  "type": "module",
  "scripts": {
    "build": "tsc",
    "start": "npm run build && node --enable-source-maps dist/server.js"
  },
  "devDependencies": {
    "@types/node": "^26.4.0",
    "typescript": "^7.0.2"
  }
}

tsconfig.json

{
  "compilerOptions": {
    "rootDir": "./src",
    "outDir": "./dist",
    "target": "ES2022",
    "module": "ES2022",
    "lib": ["ES2022", "DOM"],
    "types": ["node"],
    "strict": true,
    "sourceMap": true
  },
  "include": ["src/**/*.ts"]
}

Expected Visual Result

The output is the proof that the concept is working.

Visible Proof

The browser should visibly demonstrate: visualize records joining through record_technologies to technologies.

Data: SQLite