kmore

kmore

A SQL query builder based on Knex with powerful TypeScript type support.

Features

• Type-safe property of tables accessor
• Type-safe join table easily
• Type-safe auto-completion in IDE
• Auto Paging with one query

Installation

npm i kmore && npm i -D kmore-cli
// for Midway.js
npm i @mwcp/kmore && npm i -D kmore-cli

# Then add one of the following:
npm install pg
npm install pg-native
npm install mssql
npm install oracle
npm install sqlite3

pg-native-installation

Basic usage

Build configuration:

Edit the package.json

{
  "script": {
    "build": "tsc -b && npm run db:gen",
    "db:gen": "kmore gen --path src/ test/",
    "db:gen-cjs": "kmore gen --path src/ test/ --format cjs"
  },
}

Create connection

import { KnexConfig, kmoreFactory, genDbDict } from 'kmore'

// connection config
export const config: KnexConfig = {
  client: 'pg',
  connection: {
    host: 'localhost',
    user: 'postgres',
    password: 'foo',
    database: 'db_ci_test',
  },
}

// Define database model
export interface Db {
  tb_user: UserDo
  tb_user_ext: UserExtDo
}

export interface UserDo {
  uid: number
  name: string
  ctime: Date
}
export interface UserExtDo {
  uid: number
  age: number
  address: string
}  

const dict = genDbDict<Db>()
export const km = kmoreFactory({ config, dict })

Create tables with instance of knex

await km.dbh.schema
  .createTable('tb_user', (tb) => {
    tb.increments('uid')
    tb.string('name', 30)
    tb.timestamp('ctime', { useTz: false })
  })
  .createTable('tb_user_ext', (tb) => {
    tb.integer('uid')
    tb.foreign('uid')
      .references('tb_user.uid')
      .onDelete('CASCADE')
      .onUpdate('CASCADE')
    tb.integer('age')
    tb.string('address', 255)
  })
  .catch((err: Error) => {
    assert(false, err.message)
  })

Inert rows via auto generated table accessor

Snake style

// auto generated accessor tb_user() and tb_user_detail()
const { tb_user, tb_user_detail } = km.refTables

await tb_user()
  .insert([
    { user_name: 'user1', ctime: new Date() }, // ms
    { user_name: 'user2', ctime: 'now()' }, // μs
  ])
  .then()

const affectedRows = await tb_user_detail()
  .insert([
    { uid: 1, age: 10, user_address: 'address1' },
    { uid: 2, age: 10, user_address: 'address1' },
  ])
  .returning('*')
  .then()

Camel style

import { RecordCamelKeys } from '@waiting/shared-types'

// auto generated accessors tb_user() and tb_user_detail() 
const { tb_user, tb_user_detail } = km.camelTables

interface UserDO {
  user_name: string
  ctime: date | string
}
type UserDTO = RecordCamelKeys<UserDO>

const users: UserDTO[] = await tb_user()
  .insert([
    { userName: 'user1', ctime: new Date() }, // ms
    { userName: 'user2', ctime: 'now()' }, // μs
  ])
  .returning('*')
  .then()

Smart Join tables with types hint and auto complete

const uid = 1

// tb_user JOIN tb_user_ext ON tb_user_ext.uid = tb_user.uid
const ret = await km.camelTables.tb_user()
  .smartJoin(
    'tb_user_ext.uid',
    'tb_user.uid',
  )
  .select('*')
  .where({ uid }) // <-- has auto-complete with 'uid'
  // .where('uid', uid)   <-- has auto-complete with 'uid'
  // .where('tb_user_ext_uid', uid) <-- has auto-complete with 'tb_user_ext_uid'
  // .where(km.dict.scoped.tb_user.uid, 1)
  .then(rows => rows[0])

assert(ret)
ret.uid
ret.tb_user_ext_uid   // <-- duplicate uid will be converted with table prefix like "<tb_name>_<column>"

More examples of join see joint-table

Auto Paging

• RawType:

  const options: Partial<PagingOptions> = {
    page: 2,      // default 1
    pageSize: 20, // default 10
  }
  const users = await tables.tb_user().autoPaging(options)
  assert(Array.isArray(users))
  assert(users.length)
  
  // not enumerable properties of pager
  const { 
    total,    // total records
    page,     // current page number, start from 1
    pageSize, // size of items each page
  } = users
  const [ user ] = users
  

• WrapType:

  const options: Partial<PagingOptions> = {
    page: 2,      // default 1
    pageSize: 20, // default 10
  }
  const users = await tables.tb_user().autoPaging(options, true)
  assert(! Array.isArray(users))
  assert(Array.isArray(users.rows))
  assert(users.rows.length)
  
  // enumerable properties of pager
  const { 
    total,    // total records
    page,     // current page number, start from 1
    pageSize, // size of items each page
    rows,     // response records
  } = users
  const [ user ] = users.rows
  

More examples of auto paging see auto-paing

Use instance of knex

// drop table
await km.dbh.raw(`DROP TABLE IF EXISTS "${tb}" CASCADE;`).then()

// disconnect
await km.dbh.destroy()

Midway.js component

Config

// file: src/config/config.{prod | local | unittest}.ts

import { genDbDict } from 'kmore-types'
import { KmoreSourceConfig } from '@mwcp/kmore'
import { TbAppDO, TbMemberDO } from '../do/database.do.js'

export interface Db {
  tb_app: TbAppDO
  tb_user: TbMemberDO
}

export const dbDict = genDbDict<Db>()

const master: DbConfig<Db, Context> = {
  config: {
    client: 'pg',
    connection: {
      host: 'localhost',
      port: 5432,
      database: 'db_test',
      user: 'postgres',
      password: 'password',
    },
  },
  dict: dbDict,
  sampleThrottleMs: 500,
  enableTracing: true, // jaeger tracer
}
export const kmoreConfig: KmoreSourceConfig = {
  dataSource: {
    master,
    // slave,
  },
}  

Usage

import { Init, Inject } from '@midwayjs/decorator'

@Provide()
export class UserRepo {

  @Inject() dbManager: DbManager<'master' | 'slave', Db>

  protected db: Kmore<Db>

  @Init()
  async init(): Promise<void> {
    this.db = this.dbManager.getDataSource('master')
  }

  async getUser(uid: number): Promise<UserDTO | undefined> {
    const { tb_user } = this.db.camelTables
    const user = await tb_user()
      .where({ uid })
      .then(rows => rows[0])
    return user
  }
}

Demo

• see test

Packages

kmore is comprised of many specialized packages. This repository contains all these packages. Below you will find a summary of each package.

Package	Version
kmore
kmore-types
kmore-cli
@mwcp/kmore

License

MIT

Languages

• English
• 中文