TypeScript Lab: Find Record By ID

LAB / EXPLORATION

TypeScript Lab: Find Record By ID

Planned

LAB 052 — SQLite & Data Access
Enter a record ID and display one matching record.

LAB TypeScript Lab: Find Record By ID Preview coming soon

LAB 052

TypeScript Lab: Find Record By ID

Concept

Parameterized WHERE queries retrieve one specific row safely.

Concept

Parameterized WHERE queries retrieve one specific row safely.

Objective & Explanation

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

Learning Target

Objective

Enter a record ID and display one matching record.

Explanation

Parameterized WHERE queries retrieve one specific row safely.

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 → getRecordById()

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.

function getRecordById(id: string) {
  return database.prepare(`
    SELECT *
    FROM records
    WHERE id = ?
  `).get(id);
}

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: enter a record ID and display one matching record.

Data: SQLite