TypeScript Lab: Prepared Parameter Viewer

LAB / EXPLORATION

TypeScript Lab: Prepared Parameter Viewer

Planned

LAB 053 — SQLite & Data Access
Show how a value replaces a SQL placeholder safely.

LAB TypeScript Lab: Prepared Parameter Viewer Preview coming soon

LAB 053

TypeScript Lab: Prepared Parameter Viewer

Concept

Prepared statements keep query structure separate from user-supplied values.

Concept

Prepared statements keep query structure separate from user-supplied values.

Objective & Explanation

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

Learning Target

Objective

Show how a value replaces a SQL placeholder safely.

Explanation

Prepared statements keep query structure separate from user-supplied values.

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

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 statement = database.prepare(`
  SELECT *
  FROM records
  WHERE id = ?
`);

const row = statement.get(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: show how a value replaces a SQL placeholder safely.

Data: SQLite