TiDB Cloud Serverless Driver for JavaScript

This driver is for serverless and edge compute platforms that require HTTP external connections, such as Vercel Edge Functions or Cloudflare Workers.

Installation (Unpublished)

npm install @tidbcloud/serverless

Usage

import { connect } from '@tidbcloud/serverless'

const config = {
  host: '<host>',
  username: '<user>',
  password: '<password>'
}

const conn = connect(config)
const results = await conn.execute('select 1 from test')

Query with placeholder:

import { connect } from '@tidbcloud/serverless'

const config = {
  host: '<host>',
  username: '<user>',
  password: '<password>'
}

const conn = connect(config)
const results = await conn.execute('select 1 from test where id = ?', [1])
const results2 = await conn.execute('select 1 from test where id = :id', {id:1})

Use the transaction function to safely perform database transactions:

import { connect } from '@tidbcloud/serverless'

const config = {
  host: '<host>',
  username: '<user>',
  password: '<password>'
}
const conn = connect(config)
const tx = await conn.begin()
try {
  await tx.execute('insert into test values (1)')
  await tx.execute('select * from test')
  await tx.commit()
}catch (err) {
  await tx.rollback()
  throw err
}

Configuration

The following configurations are supported in connection level:

name	type	default	comment
username	string	/	Username of TiDB Severless
password	string	/	Password of TiDB Severless
host	string	/	Host of TiDB Severless
database	string	test	Database of TiDB Severless
url	string	/	A single url format as `mysql://username:password@host/database`
fetch	function	global fetch	Custom fetch function

Database URL

A single database URL value can be used to configure the host, username, password and database values:

const conn = connect({url: process.env['DATABASE_URL'] || 'mysql://username:password@host/database'})

Database can be skipped to use the default one:

const conn = connect({url: process.env['DATABASE_URL'] || 'mysql://username:password@host'})

Custom fetch function

You can custom fetch function instead of using the global one. It’s useful when you run in the environment without a built-in global fetch function. For example, an older version of Node.js.

import { connect } from '@tidbcloud/serverless'
import { fetch } from 'undici'

const config = {
  fetch,
  url: process.env['DATABASE_URL'] || 'mysql://username:password@host/database'
}

const conn = connect(config)
const results = await conn.execute('select 1 from test')

Options

The following options are supported in SQL level:

option	type	default	comment
arrayMode	bool	false	whether to return results as arrays instead of objects
fullResult	bool	false	whether to return full result object instead of just rows

import { connect } from '@tidbcloud/serverless'

const config = {
  url: process.env['DATABASE_URL'] || 'mysql://username:password@host/database'
}

const conn = connect(config)
const results = await conn.execute('select 1 from test',null,{arrayMode:true,fullResult:true})

Features

Supported SQL

The following SQL statements are supported: Select, Show, Explain, Use, Insert, Update, Delete, Begin, Commit, Rollback.

And most of the DDL are supported.

Data Type Mapping

The type mapping between TiDB and Javascript is as follows:

TiDB Type	Javascript Type
TINYINT	number
UNSIGNED TINYINT	number
BOOL	number
SMALLINT	number
UNSIGNED SMALLINT	number
MEDIUMINT	number
INT	number
UNSIGNED INT	number
YEAR	number
FLOAT	number
DOUBLE	number
BIGINT	string
UNSIGNED BIGINT	string
DECIMAL	string
CHAR	string
VARCHAR	string
BINARY	string
VARBINARY	string
TINYTEXT	string
TEXT	string
MEDIUMTEXT	string
LONGTEXT	string
TINYBLOB	string
BLOB	string
MEDIUMBLOB	string
LONGBLOB	string
DATE	string
TIME	string
DATETIME	string
TIMESTAMP	string
ENUM	string
SET	string
BIT	string
JSON	object
NULL	null
Others	string

Limitations

Up to 10,000 rows can be fetched in a single query.