develop guide: add sample applications - sequelize (#14705) (#14925)

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diff --git a/TOC-tidb-cloud.md b/TOC-tidb-cloud.md
@@ -42,6 +42,7 @@
       - [node-mysql2](/develop/dev-guide-sample-application-nodejs-mysql2.md)
       - [mysql.js](/develop/dev-guide-sample-application-nodejs-mysqljs.md)
       - [Prisma](/develop/dev-guide-sample-application-nodejs-prisma.md)
+      - [Sequelize](/develop/dev-guide-sample-application-nodejs-sequelize.md)
       - [TypeORM](/develop/dev-guide-sample-application-nodejs-typeorm.md)
       - [Next.js](/develop/dev-guide-sample-application-nextjs.md)
       - [AWS Lambda](/develop/dev-guide-sample-application-aws-lambda.md)

diff --git a/TOC.md b/TOC.md
@@ -41,6 +41,7 @@
       - [node-mysql2](/develop/dev-guide-sample-application-nodejs-mysql2.md)
       - [mysql.js](/develop/dev-guide-sample-application-nodejs-mysqljs.md)
       - [Prisma](/develop/dev-guide-sample-application-nodejs-prisma.md)
+      - [Sequelize](/develop/dev-guide-sample-application-nodejs-sequelize.md)
       - [TypeORM](/develop/dev-guide-sample-application-nodejs-typeorm.md)
       - [Next.js](/develop/dev-guide-sample-application-nextjs.md)
       - [AWS Lambda](/develop/dev-guide-sample-application-aws-lambda.md)

diff --git a/develop/dev-guide-sample-application-nodejs-sequelize.md b/develop/dev-guide-sample-application-nodejs-sequelize.md
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+---
+title: Connect to TiDB with Sequelize
+summary: Learn how to connect to TiDB using Sequelize. This tutorial gives Node.js sample code snippets that work with TiDB using Sequelize.
+---
+
+# Connect to TiDB with Sequelize
+
+TiDB is a MySQL-compatible database, and [Sequelize](https://sequelize.org/) is a popular ORM framework for Node.js.
+
+In this tutorial, you can learn how to use TiDB and Sequelize to accomplish the following tasks:
+
+- Set up your environment.
+- Connect to your TiDB cluster using Sequelize.
+- Build and run your application. Optionally, you can find [sample code snippets](#sample-code-snippets) for basic CRUD operations.
+
+> **Note**
+>
+> This tutorial works with TiDB Serverless, TiDB Dedicated, and TiDB Self-Hosted.
+
+## Prerequisites
+
+To complete this tutorial, you need:
+
+- [Node.js **18**](https://nodejs.org/en/download/) or later.
+- [Git](https://git-scm.com/downloads).
+- A TiDB cluster.
+
+<CustomContent platform="tidb">
+
+**If you don't have a TiDB cluster, you can create one as follows:**
+
+- (Recommended) Follow [Creating a TiDB Serverless cluster](/develop/dev-guide-build-cluster-in-cloud.md) to create your own TiDB Cloud cluster.
+- Follow [Deploy a local test TiDB cluster](/quick-start-with-tidb.md#deploy-a-local-test-cluster) or [Deploy a production TiDB cluster](/production-deployment-using-tiup.md) to create a local cluster.
+
+</CustomContent>
+<CustomContent platform="tidb-cloud">
+
+**If you don't have a TiDB cluster, you can create one as follows:**
+
+- (Recommended) Follow [Creating a TiDB Serverless cluster](/develop/dev-guide-build-cluster-in-cloud.md) to create your own TiDB Cloud cluster.
+- Follow [Deploy a local test TiDB cluster](https://docs.pingcap.com/tidb/stable/quick-start-with-tidb#deploy-a-local-test-cluster) or [Deploy a production TiDB cluster](https://docs.pingcap.com/tidb/stable/production-deployment-using-tiup) to create a local cluster.
+
+</CustomContent>
+
+## Run the sample app to connect to TiDB
+
+This section demonstrates how to run the sample application code and connect to TiDB.
+
+> **Note**
+>
+> For complete code snippets and running instructions, refer to the [tidb-samples/tidb-nodejs-sequelize-quickstart](https://github.com/tidb-samples/tidb-nodejs-sequelize-quickstart) GitHub repository.
+
+### Step 1: Clone the sample app repository
+
+Run the following commands in your terminal window to clone the sample code repository:
+
+```bash
+git clone [email protected]:tidb-samples/tidb-nodejs-sequelize-quickstart.git
+cd tidb-nodejs-sequelize-quickstart
+```
+
+### Step 2: Install dependencies
+
+Run the following command to install the required packages (including `sequelize`) for the sample app:
+
+```bash
+npm install
+```
+
+### Step 3: Configure connection information
+
+Connect to your TiDB cluster depending on the TiDB deployment option you've selected.
+
+<SimpleTab>
+
+<div label="TiDB Serverless">
+
+1. Navigate to the [**Clusters**](https://tidbcloud.com/console/clusters) page, and then click the name of your target cluster to go to its overview page.
+
+2. Click **Connect** in the upper-right corner. A connection dialog is displayed.
+
+3. Ensure the configurations in the connection dialog match your operating environment.
+
+    - **Endpoint Type** is set to `Public`
+    - **Connect With** is set to `General`
+    - **Operating System** matches your environment.
+
+    > **Note**
+    >
+    > In Node.js applications, you don't have to provide an SSL CA certificate, because Node.js uses the built-in [Mozilla CA certificate](https://wiki.mozilla.org/CA/Included_Certificates) by default when establishing the TLS (SSL) connection.
+
+4. Click **Create password** to create a random password.
+
+    > **Tip**
+    >
+    > If you have generated a password before, you can either use the original password or click **Reset password** to generate a new one.
+
+5. Run the following command to copy `.env.example` and rename it to `.env`:
+
+    ```shell
+    cp .env.example .env
+    ```
+
+6. Edit the `.env` file, set up the environment variables as follows, replace the corresponding placeholders `{}` with connection parameters on the connection dialog:
+
+    ```dotenv
+    TIDB_HOST='{host}'
+    TIDB_PORT='4000'
+    TIDB_USER='{user}'
+    TIDB_PASSWORD='{password}'
+    TIDB_DB_NAME='test'
+    TIDB_ENABLE_SSL='true'
+    ```
+
+7. Save the `.env` file.
+
+</div>
+
+<div label="TiDB Dedicated">
+
+1. Navigate to the [**Clusters**](https://tidbcloud.com/console/clusters) page, and then click the name of your target cluster to go to its overview page.
+
+2. Click **Connect** in the upper-right corner. A connection dialog is displayed.
+
+3. Click **Allow Access from Anywhere** and then click **Download TiDB cluster CA** to download the CA certificate.
+
+    For more details about how to obtain the connection string, refer to [TiDB Dedicated standard connection](https://docs.pingcap.com/tidbcloud/connect-via-standard-connection).
+
+4. Run the following command to copy `.env.example` and rename it to `.env`:
+
+    ```shell
+    cp .env.example .env
+    ```
+
+5. Edit the `.env` file, set up the environment variables as follows, replace the corresponding placeholders `{}` with connection parameters on the connection dialog:
+
+    ```shell
+    TIDB_HOST='{host}'
+    TIDB_PORT='4000'
+    TIDB_USER='{user}'
+    TIDB_PASSWORD='{password}'
+    TIDB_DB_NAME='test'
+    TIDB_ENABLE_SSL='true'
+    TIDB_CA_PATH='{path/to/ca}'
+    ```
+
+6. Save the `.env` file.
+
+</div>
+
+<div label="TiDB Self-Hosted">
+
+1. Run the following command to copy `.env.example` and rename it to `.env`:
+
+    ```shell
+    cp .env.example .env
+    ```
+
+2. Edit the `.env` file, set up the environment variables as follows, replace the corresponding placeholders `{}` with connection parameters on the connection dialog:
+
+    ```shell
+    TIDB_HOST='{host}'
+    TIDB_PORT='4000'
+    TIDB_USER='root'
+    TIDB_PASSWORD='{password}'
+    TIDB_DB_NAME='test'
+    ```
+
+    If you are running TiDB locally, the default host address is `127.0.0.1`, and the password is empty.
+
+3. Save the `.env` file.
+
+</div>
+
+</SimpleTab>
+
+### Step 4: Run the sample app
+
+Run the following command to execute the sample code:
+
+```shell
+npm start
+```
+
+<details>
+<summary>**Expected output(partial):**</summary>
+
+```shell
+INFO (app/10117): Getting sequelize instance...
+Executing (default): SELECT 1+1 AS result
+Executing (default): DROP TABLE IF EXISTS `players`;
+Executing (default): CREATE TABLE IF NOT EXISTS `players` (`id` INTEGER NOT NULL auto_increment  COMMENT 'The unique ID of the player.', `coins` INTEGER NOT NULL COMMENT 'The number of coins that the player had.', `goods` INTEGER NOT NULL COMMENT 'The number of goods that the player had.', `createdAt` DATETIME NOT NULL, `updatedAt` DATETIME NOT NULL, PRIMARY KEY (`id`)) ENGINE=InnoDB;
+Executing (default): SHOW INDEX FROM `players`
+Executing (default): INSERT INTO `players` (`id`,`coins`,`goods`,`createdAt`,`updatedAt`) VALUES (1,100,100,'2023-08-31 09:10:11','2023-08-31 09:10:11'),(2,200,200,'2023-08-31 09:10:11','2023-08-31 09:10:11'),(3,300,300,'2023-08-31 09:10:11','2023-08-31 09:10:11'),(4,400,400,'2023-08-31 09:10:11','2023-08-31 09:10:11'),(5,500,500,'2023-08-31 09:10:11','2023-08-31 09:10:11');
+Executing (default): SELECT `id`, `coins`, `goods`, `createdAt`, `updatedAt` FROM `players` AS `players` WHERE `players`.`coins` > 300;
+Executing (default): UPDATE `players` SET `coins`=?,`goods`=?,`updatedAt`=? WHERE `id` = ?
+Executing (default): DELETE FROM `players` WHERE `id` = 6
+```
+
+</details>
+
+## Sample code snippets
+
+You can refer to the following sample code snippets to complete your own application development.
+
+For complete sample code and how to run it, check out the [tidb-samples/tidb-nodejs-sequelize-quickstart](https://github.com/tidb-samples/tidb-nodejs-sequelize-quickstart) repository.
+
+### Connect to TiDB
+
+The following code establish a connection to TiDB with options defined in the environment variables:
+
+```typescript
+// src/lib/tidb.ts
+import { Sequelize } from 'sequelize';
+
+export function initSequelize() {
+  return new Sequelize({
+    dialect: 'mysql',
+    host: process.env.TIDB_HOST || 'localhost',     // TiDB host, for example: {gateway-region}.aws.tidbcloud.com
+    port: Number(process.env.TIDB_PORT) || 4000,    // TiDB port, default: 4000
+    username: process.env.TIDB_USER || 'root',      // TiDB user, for example: {prefix}.root
+    password: process.env.TIDB_PASSWORD || 'root',  // TiDB password
+    database: process.env.TIDB_DB_NAME || 'test',   // TiDB database name, default: test
+    dialectOptions: {
+      ssl:
+        process.env?.TIDB_ENABLE_SSL === 'true'     // (Optional) Enable SSL
+          ? {
+              minVersion: 'TLSv1.2',
+              rejectUnauthorized: true,
+              ca: process.env.TIDB_CA_PATH          // (Optional) Path to the custom CA certificate
+                ? readFileSync(process.env.TIDB_CA_PATH)
+                : undefined,
+            }
+          : null,
+    },
+}
+
+export async function getSequelize() {
+  if (!sequelize) {
+    sequelize = initSequelize();
+    try {
+      await sequelize.authenticate();
+      logger.info('Connection has been established successfully.');
+    } catch (error) {
+      logger.error('Unable to connect to the database:');
+      logger.error(error);
+      throw error;
+    }
+  }
+  return sequelize;
+}
+```
+
+### Insert data
+
+The following query creates a single `Players` record and returns a `Players` object:
+
+```typescript
+logger.info('Creating a new player...');
+const newPlayer = await playersModel.create({
+  id: 6,
+  coins: 600,
+  goods: 600,
+});
+logger.info('Created a new player.');
+logger.info(newPlayer.toJSON());
+```
+
+For more information, refer to [Insert data](/develop/dev-guide-insert-data.md).
+
+### Query data
+
+The following query returns a single `Players` record those coins are greater than `300`:
+
+```typescript
+logger.info('Reading all players with coins > 300...');
+const allPlayersWithCoinsGreaterThan300 = await playersModel.findAll({
+  where: {
+    coins: {
+      [Op.gt]: 300,
+    },
+  },
+});
+logger.info('Read all players with coins > 300.');
+logger.info(allPlayersWithCoinsGreaterThan300.map((p) => p.toJSON()));
+```
+
+For more information, refer to [Query data](/develop/dev-guide-get-data-from-single-table.md).
+
+### Update data
+
+The following query set `700` coins and `700` goods to the `Players` with ID `6` that was created in the [Insert data](#insert-data) section:
+
+```typescript
+logger.info('Updating the new player...');
+await newPlayer.update({ coins: 700, goods: 700 });
+logger.info('Updated the new player.');
+logger.info(newPlayer.toJSON());
+```
+
+For more information, refer to [Update data](/develop/dev-guide-update-data.md).
+
+### Delete data
+
+The following query deletes the `Player` record with ID `6` that was created in the [Insert data](#insert-data) section:
+
+```typescript
+logger.info('Deleting the new player...');
+await newPlayer.destroy();
+const deletedNewPlayer = await playersModel.findByPk(6);
+logger.info('Deleted the new player.');
+logger.info(deletedNewPlayer?.toJSON());
+```
+
+For more information, refer to [Delete data](/develop/dev-guide-delete-data.md).
+
+## Next steps
+
+- Learn more usage of the ORM framework Sequelize driver from [the documentation of Sequelize](https://sequelize.org/).
+- Learn the best practices for TiDB application development with the chapters in the [Developer guide](/develop/dev-guide-overview.md), such as [Insert data](/develop/dev-guide-insert-data.md), [Update data](/develop/dev-guide-update-data.md), [Delete data](/develop/dev-guide-delete-data.md), [Single table reading](/develop/dev-guide-get-data-from-single-table.md), [Transactions](/develop/dev-guide-transaction-overview.md), and [SQL performance optimization](/develop/dev-guide-optimize-sql-overview.md).
+- Learn through the professional [TiDB developer courses](https://www.pingcap.com/education/) and earn [TiDB certifications](https://www.pingcap.com/education/certification/) after passing the exam.
+
+## Need help?
+
+Ask questions on the [Discord](https://discord.gg/DQZ2dy3cuc?utm_source=doc), or [create a support ticket](https://support.pingcap.com/).