add documentation

Author: shiyuhang0

documentation/en/Cloudflare-Workers.md

@@ -0,0 +1,270 @@
+# Run on Cloudflare Workers
+
+This document is a step-by-step tutorial on how to use `node-mysql2` on Cloudflare Workers.
+
+## Before you begin
+
+Before you try the steps in this article, you need to prepare the following things:
+
+- A [Cloudflare Workers](https://dash.cloudflare.com/login) account.
+- npm is installed.
+
+## Step 1: Set up project
+
+[Wrangler](https://developers.cloudflare.com/workers/wrangler/) is the official Cloudflare Worker CLI. You can use it to generate, build, preview, and publish your Workers.
+
+1. Install Wrangler:
+
+   ```
+   npm install wrangler
+   ```
+
+2. To authenticate Wrangler, run wrangler login:
+
+    ```
+    wrangler login
+    ```
+
+3. Use Wrangler to create a project:
+
+    ```
+    wrangler init mysql2-cloudflare -y
+    ```
+
+## Step 2: Install node-mysql2
+
+1. Enter your project directory:
+
+    ```
+    cd mysql2-cloudflare
+    ```
+
+2. Install the node-mysql2 with npm:
+
+    ```
+    npm install mysql2
+    ```
+
+   This adds the node-mysql2 dependency in `package.json`.
+
+## Step 3: Use node-mysql2 on Cloudflare Workers
+
+Develop your code in the `src/index.ts`. Here are some examples:
+
+1. local mysql example
+
+  ```ts
+  import { createConnection } from 'mysql2';
+
+  export default {
+    async fetch(
+      request: Request,
+      env: Env,
+      ctx: ExecutionContext
+    ): Promise<Response> {
+      let result
+      const connection =	createConnection(
+        {
+          host: '127.0.0.1',
+          port: 3306,
+          user: 'user',
+          password: 'password',
+          useStaticParser:true
+        });
+      connection.query(
+        'show databases',
+        function(err, rows, fields) {
+          if (err) {
+            throw err
+          }
+          result = rows
+        }
+      );
+      await sleep(2000);
+      return new Response(JSON.stringify(result))
+    },
+  };
+
+  async function sleep(ms) {
+    return new Promise(resolve => setTimeout(resolve, ms));
+  }
+  ```
+
+2. TiDB Serverless example with TLS:
+
+  ```js
+  import { createConnection } from 'mysql2';
+
+  export default {
+    async fetch(
+      request: Request,
+      env: Env,
+      ctx: ExecutionContext
+    ): Promise<Response> {
+      let result
+      const connection =	createConnection(
+        {
+          host: 'gateway01.ap-southeast-1.prod.aws.tidbcloud.com',
+          port: 4000,
+          user: 'your_user',
+          password: 'your_password',
+          database: 'test',
+          ssl: {
+            minVersion: 'TLSv1.2',
+            rejectUnauthorized: true
+          },
+          useStaticParser:true
+        });
+      connection.query(
+        'show databases',
+        function(err, rows, fields) {
+          if (err) {
+            throw err
+          }
+          result = rows
+        }
+      );
+      await sleep(2000);
+      return new Response(JSON.stringify(result))
+    },
+  };
+
+  async function sleep(ms) {
+    return new Promise(resolve => setTimeout(resolve, ms));
+  }
+  ```
+
+3. PlanetScale example with TLS:
+
+  ```js
+  import { createConnection } from 'mysql2';
+
+  export default {
+    async fetch(
+      request: Request,
+      env: Env,
+      ctx: ExecutionContext
+    ): Promise<Response> {
+      let result
+      const connection =	createConnection(
+        {
+          host: 'aws.connect.psdb.cloud',
+          port: 3306,
+          user: 'your_user',
+          password: 'your_password',
+          database: 'test',
+          ssl: {
+            minVersion: 'TLSv1.2',
+            rejectUnauthorized: true
+          },
+          useStaticParser:true
+        });
+      connection.query(
+        'show databases',
+        function(err, rows, fields) {
+          if (err) {
+            throw err
+          }
+          result = rows
+        }
+      );
+      await sleep(2000);
+      return new Response(JSON.stringify(result))
+    },
+  };
+
+  async function sleep(ms) {
+    return new Promise(resolve => setTimeout(resolve, ms));
+  }
+  ```
+
+## Step 4: Test locally
+
+1. Add `node_compat = true` in the `wrangler.toml` to make Cloudflare Workers compatible with node dependencies.
+
+  ```
+  vim wrangler.toml
+  ```
+
+2. Upgrade wrangler
+
+  ```
+  npm install [email protected] --save-dev
+  ```
+
+2. Run locally
+
+  ```
+  wrangler dev
+  ```
+
+## Step 5: Deploy
+
+You can also deploy it to Cloudflare, run `wrangler deploy`. If you meet any issues, please refer to the [Cloudflare doc](https://developers.cloudflare.com/workers/get-started/guide/#4-deploy-your-project)
+
+## Develop Guide
+
+If you want to develop the corresponding feature. Here is a simaple example of testing locally.
+
+1. enter to node-mysql2
+
+  ```
+  cd node-mysql2
+  ```
+
+2. vim wrangler.toml
+
+  ```
+  name = "mysql2-cloudflare"
+  main = "src/worker.js"
+  compatibility_date = "2023-08-21"
+  node_compat = true
+  ```
+
+3. add worker.js
+
+  ```
+  mkdir src
+  cd src
+  vim workers.js
+  ```
+
+4. write your test code inside worker.js
+
+  ```
+  const { createConnection } = require('../index');
+  export default {
+    async fetch(request, env, ctx) {
+      let result
+      const connection =	createConnection(
+        {
+          host: '127.0.0.1',
+          port: 3306,
+          user: 'test',
+          password: 'password',
+          useStaticParser:true
+        });
+      connection.query(
+        'show databases',
+        function(err, rows, fields) {
+          if (err) {
+            throw err
+          }
+          result = rows
+        }
+      );
+      await sleep(2000);
+      return new Response(JSON.stringify(result))
+    }
+  };
+
+  async function sleep(ms) {
+    return new Promise(resolve => setTimeout(resolve, ms));
+  }
+  ```
+
+5. Test locally
+
+  ```
+  npx wrangler dev
+  ```