How to connect nodejs to mycat

Steps to connect MyCAT in Node.js: Install the mycat-ts dependency. Create a connection pool, specify the host, port, username, password and database. Use the query method to execute SQL queries. Use the close method to close the connection pool.

How to connect to MyCAT in Node.js

MyCAT is a distributed database middleware for connecting different databases. By using Node.js, you can easily connect to and interact with MyCAT.

Installing dependencies

First, install mycat-ts dependencies in the project:

<code>npm install mycat-ts</code>

Connect MyCAT

Use mycat-ts Create a connection pool:

<code class="typescript">import { Pool } from "mycat-ts";

const pool = new Pool({
  host: "mycat_host",
  port: 8066,
  user: "mycat_user",
  password: "mycat_password",
  database: "mycat_database",
});</code>

Note:

• host is the host address of MyCAT.
• port is the port of MyCAT, the default is 8066.
• user and password are the username and password used to connect to MyCAT.
• database is the MyCAT database to be connected.

Query data

After obtaining the connection, you can use the query method to execute the SQL query:

<code class="typescript">const results = await pool.query("SELECT * FROM table_name");</code>

Close the connection pool

Use the close method to close the connection pool:

<code class="typescript">await pool.close();</code>

Example

The following is a complete Example showing how to connect to MyCAT and query data:

<code class="typescript">import { Pool } from "mycat-ts";

async function main() {
  const pool = new Pool({
    host: "mycat_host",
    port: 8066,
    user: "mycat_user",
    password: "mycat_password",
    database: "mycat_database",
  });

  const results = await pool.query("SELECT * FROM table_name");

  console.log(results);

  await pool.close();
}

main().catch(console.error);</code>

The above is the detailed content of How to connect nodejs to mycat. For more information, please follow other related articles on the PHP Chinese website!