linsql

使用TS封装node-mysql的常用操作，可链式调用，与ThinkPHP的查询器类似 部分功能还在优化

• Install
• Introduction
• Jest

Install

npm install --save linsql

Introduction

配置(CONFIG)

参数 | 说明 | 类型 | 默认值 -|--|--|-- host | 数据库的主机名 | string| 必填项 port| 要连接的端口号 | string | 3306 user| MySQL用户 | string | 必填项 password| MySQL用户的密码 | string | 必填项 database| 数据库名称 | string | 必填项 prefix| 数据库的前缀 | string | 可选

其他配置 mysqljs/mysql

创建连接

import linsql from 'linsql'
const db = linsql.connect({
	host: 'localhost',
	password: 'root',
	user: 'root',
	database: 'demo',
	prefix: 't_'
})

基本的查询

import linsql from 'linsql'
const db = linsql.connect({
	host: 'localhost',
	password: 'root',
	user: 'root',
	database: 'school',
	prefix: 'sc_'
})
db.name('teacher').where('username', '').select().then(res => {
	//return [rows]
})

Promise化

• select

  //select
  db.name('teacher').where('username', '').select().then(res => {})
  
  async function find() {
  	let res = await db.name('teacher').where('username','').find()
  }

• update

  db.name('teacher').where('username', '').update({
  	username:'张三'
  }).then(res => {
  	console.log(res) //return affected rows
  })

• delete

  db.name('teacher').where('username', '').delete().then(res => {
  	console.log(res) //return affected rows
  })

• insert

  db
  .name('teacher')
  .insert([{
  	username: '李四',
  	create_time: new Date(),
  }])
  .then((res) => {
  	console.log(res)	//return { affectedRows, insertId }
  })

• insertGetId

  db
  .name('teacher')
  .insertGetId([{
  	username: '李四',
  	create_time: new Date(),
  }])
  .then((res) => {
  	console.log(res)	//return insert Id
  })

• query

  db.query("SELECT * FROM `sc_teacher` WHERE `username` = ''").then(res => {
  	//return { affectedRows, insertId }
  })
  //PrepareStatement机制
  db.exec("SELECT * FROM `sc_teacher` WHERE `username` = ?", ['']).then(res => {
  	//return { affectedRows, insertId }
  })

Methods

• name (names: string | string[] ) 主要用于指定操作的数据表(不包含表前缀)

  db.name('teacher').where('username', '').select()
  
  //SELECT * FROM `sc_teacher` WHERE `username` = ''

  选择多张表

  db.name(['teacher', 'student'])
  //SELECT * FROM t_teacher,t_student

  设置表别名

  db.name(['teacher t', 'student s'])
  //SELECT * FROM t_teacher AS t,t_student AS s

• table (names:string | string[] ) 主要用于指定操作的数据表(包含表前缀)

  db.table('sc_teacher').where('username', '').select()
  
  //SELECT * FROM `sc_teacher` WHERE `username` = ''

• where (field:string|object, operator?:string|number, condition?:string|string[]|number|number[]) 用于数据查询

  • field 查询的字段 也可以是一段查询表达式 如: 'id is not null'

  • operator 查询表达式(不区分大小写)

    |表达式|说明| |-----|----| |= or eq|等于| |> or gt|大于| |< or lt|小于| |>= or egt|大于等于| |<= or elt|小于等于| |<> or neq|不等于| |like|模糊查询| |between|区间查询| |not between|不在区间查询| |in|in查询| |not in|不在in查询| |null|null查询| |not null|不是null查询| 表达式还不支持时间, 后续迭代

  • condition 查询的条件

  //以下的查询都是等价的
  db.name('teacher').where('username = \'\'')
  db.name('teacher').where('username', '')
  db.name('teacher').where('username', '=', '')
  db.name('teacher').where({
  	username:[''] // or username:''	默认是=表达式
  })
  db.name('teacher').where({
  	username:['=', '']
  })
  
  //一个字段有多个条件情况下
  //like
  db.name('teacher').where('username', 'like', '%张')
  db.name('teacher').where({
  	username:['like','%张']
  })
  //多个like查询
  db.name('teacher').where({
  	username:[
  		['like', '%张'],
  		'or', // 'and'
  		['like', '张%']
  	]
  })
  db.name('teacher').where({
  	id:[
  		['>', 1],
  		['<', 10]
  	]
  })
  //等价于下面这个例子
  db.name('teacher').where({
  	id:[
  		['>',1],
  		'and',
  		['<', 10]
  	]
  })
  
  //between查询
  db.name('teacher').where('id', 'between', [1,4])	//条件为数组
  db.name('teacher').where('id', 'not between', [1,4])
  
  //in查询
  db.name('teacher').where('id', 'in', [1,2,3])
  db.name('teacher').where('id', 'not in', [1,2,3])
  
  //null查询
  db.name('teacher').where('id', 'null')
  db.name('teacher').where('id', 'not null')

• alias (names:string | object ) 用于设置当前的数据表的别名

  db.table('sc_teacher').alias('a').where('username', '').select()
  //SELECT * FROM `sc_teacher` WHERE `username` = ''
  db.table(['sc_teacher', 'sc_student']).alias({
  	'sc_teacher':'a',
  	'sc_student':'b'
  }).where('username', '').select()

• field (fields:string ) 主要用于返回指定的字段

  db.table('sc_teacher').field('id,username,create_time').where('username', '').select()
  
  //SELECT id,username,create_time FROM `sc_teacher` WHERE `username` = ''

• limit (star:string|number, end?:number) 主要用于分页操作

  db.table('sc_teacher').where('username', '').limit('1,5').select()
  db.table('sc_teacher').where('username', '').limit(1,5).select()
  //SELECT * FROM `sc_teacher` WHERE `username` = '' LIMIT 1,5

• group (fields:string)

  db.table('sc_teacher').where('username', '').group('id').select()
  //SELECT * FROM `sc_teacher` WHERE `username` = '' GROUP BY id

• distinct (isDistinct: boolean)

  db.table('sc_teacher').field('username').distinct(true).select()
  //SELECT DISTINCT username FROM `sc_teacher`

• join (table: string, condition: string, joinType:sqlJoinType = 'INNER')

  type JoinType = 'INNER' | 'LEFT' | 'RIGHT' | 'FULL'
  db.table('sc_teacher').alias('a').join("sc_student b", "a.username = b.teacher_name").select()
  //SELECT * FROM sc_teacher a INNER JOIN sc_student b ON a.username = b.teacher_name
  
  db.table('sc_teacher').alias('a').where('username', '').join("sc_student b", "a.username = b.teacher_name").select()
  //SELECT * FROM sc_teacher a INNER JOIN sc_student b ON a.username = b.teacher_name WHERE a.username = ''

• order (field: string)

  db.table('sc_teacher').where('username', '').order('id DESC').select()
  //SELECT * FROM sc_teacher a WHERE a.username = '' ORDER BY `id` DESC
  
  db.table('sc_teacher').where('username', '').order('id DESC, username ASC').select()
  //SELECT * FROM sc_teacher a WHERE a.username = '' ORDER BY `id` DESC, `username` ASC

• comment (desc: string) 主要用于写注释,方便后续维护修改

  db.table('sc_teacher').comment("Query sc_teacher").where('username', '').select()
  //SELECT * FROM sc_teacher a WHERE a.username = ''  ##Query sc_teacher

• transform (sql:string, values:any[]) 主要用于转换sql查询语句

  db.transform('SELECT * FROM sc_teacher a WHERE a.username = ?', [''])
  //SELECT * FROM sc_teacher a WHERE a.username = ''

• parse () 解析查询器

  db.name('teacher').where('username', '').parse()
  //{
  //	sql:SELECT * FROM t_teacher WHERE `username` = ?,
  //	values:['']	
  //}

Jest

npm run test

• 例子

  const config = {
  	host: '127.0.0.1',
  	database: 'ormtype',
  	user: 'root',
  	password: 'root',
  	prefix: 'sc_'
  }
  let db = Db.connect(config)
  describe('where查询 => table:teacher,condition:id = 1', () => {
  	it('用例1:', () => {
  		let data = {
  			sql: 'SELECT * FROM `sc_teacher` WHERE `id` = ?',
  			values:[1]
  		} 
  		db.name('teacher').where('id',1)
          let map = db.getEscapMap()
          expect(map).toEqual(data)
  	})
  })