5no-pg-builder 中文文档教程

Question

PG Builder

PostgreSQL 的简单查询生成器

此包已移至 @5no/pg-builder

Install

@5no/pg-构建器需要 Node 版本 8 或更高版本。

npm install --save @5no/pg-builder

.env

DATABASE_URL=postgres://test:123123@127.0.0.1:5432/testDB?ssl=false
DATABASE_QUERY_LOG=true

Manager.build

{
    table: "users",
    alias: "Testusers",
    schema: "custom",
    rowsHandler: fn(rows, method: 'select' | 'count' | 'update' | 'delete'),
}

Methods

async execute() // Return PG result
async rows() // Return rows of PG result
async result() // Return summary of count_rows, use only with count
async query() // Return raw query text

Examples

选择

const Manager = require('@5no/pg-builder')

const Users = await Manager.build({
    table: "users"
  }).select(["*"]).execute()

// "SELECT users.* FROM public.users AS users"    

const Users = await Manager.build({
    table: "users",
    alias: "Testusers"
  }).select(["*"]).execute()

// "SELECT Testusers.* FROM public.users AS Testusers"    

const Users = await Manager.build({
    table: "users",
    alias: "Testusers",
    schema: "custom"
  }).select(["*"])
  .execute()

// "SELECT Testusers.* FROM custom.users AS Testusers"    

const Users = await Manager.build({
    table: "users",
    alias: "Testusers",
    schema: "custom"
  }).select(["sum(email) AS sum_emails"])
  .execute()

// "SELECT sum(Testusers.email) AS sum_emails FROM custom.users AS Testusers"    

const Users = await Manager.build({
    table: "users",
    alias: "Testusers",
    schema: "custom"
  }).select(["email", "first_name", "last_name AS FN"])
    .where('status', '=', 'active')
    .whereIn('id', ['1', '2', '3'])
    .whereOr('email', '=', 'test')
    .whereOr('email', '=', 'test1')
    .execute()

// "SELECT Testusers.email, Testusers.first_name, Testusers.last_name AS FN FROM custom.users AS Testusers WHERE Testusers.status = $1 AND Testusers.id IN ($2,$3,$4) AND (Testusers.email = $5 OR Testusers.email = $6)"    

const Users = await Manager.build({
    table: "users",
    alias: "Testusers",
    schema: "custom"
  }).select(["email", "first_name", "last_name AS FN"])
    .whereOr('email', '=', 'test', 'email')
    .whereOr('email', '=', 'test1', 'email')
    .whereOr('last_name', '=', 'last_name1', 'last_name')
    .whereOr('last_name', '=', 'last_name2', 'last_name')
    .execute()

// "SELECT Testusers.email, Testusers.first_name, Testusers.last_name AS FN FROM custom.users AS Testusers WHERE (Testusers.email = $1 OR Testusers.email = $2) AND (Testusers.last_name = $3 OR Testusers.last_name = $4)"    

const Users = await Manager.build({
    table: "users",
    alias: "Testusers",
    schema: "custom"
  }).select(["email", "first_name", "last_name AS FN"])
    .distinct()
    .where('first_name', '=', 'first_name_test')
    .order('email', 'ASC')
    .order('first_name', 'DESC')
    .limit(10, 5)
    .execute()

// "SELECT DISTINCT Testusers.email, Testusers.first_name, Testusers.last_name AS FN FROM custom.users AS Testusers WHERE Testusers.first_name = $1 ORDER BY Testusers.email ASC, Testusers.first_name DESC LIMIT 10 OFFSET 5"    

const Users = await Manager.build({
    table: "users",
    alias: "Testusers",
    schema: "custom"
  }).select(["email"])
    .where('first_name', '=', 'first_name_test')
    .group(['email'])
    .order('email', 'ASC')
    .having('count(email)', '>', '1')
    .execute()

// "SELECT Testusers.email FROM custom.users AS Testusers WHERE Testusers.first_name = $1 GROUP BY Testusers.email HAVING count(Testusers.email) > $2 ORDER BY Testusers.email ASC"   

const Users = await Manager.build({
    table: "users",
    alias: "Testusers",
    schema: "custom"
  }).select(["email"])
    .where('first_name', '=', 'first_name_test')
    .whereBetween('created_at', '2019-10-12', '2019-11-12')
    .group(['email'])
    .order('email', 'ASC')
    .having('count(email)', '>', '1')
    .execute()

// "SELECT Testusers.email FROM custom.users AS Testusers WHERE Testusers.first_name = $1 AND Testusers.created_at BETWEEN $2 AND $3 GROUP BY Testusers.email HAVING count(Testusers.email) > $4 ORDER BY Testusers.email ASC"   

const Users = await Manager.build({
    table: "users",
    alias: "Testusers",
    schema: "custom"
  }).select(["email"])
    .where('first_name', '=', 'first_name_test')
    .whereNotBetween('created_at', '2019-10-12', '2019-11-12')
    .group(['email'])
    .order('email', 'ASC')
    .having('count(email)', '>', '1')
    .execute()

// "SELECT Testusers.email FROM custom.users AS Testusers WHERE Testusers.first_name = $1 AND Testusers.created_at NOT BETWEEN $2 AND $3 GROUP BY Testusers.email HAVING count(Testusers.email) > $4 ORDER BY Testusers.email ASC"   

const Users = await Manager.build({
    table: "users",
    alias: "Testusers",
    schema: "custom"
  }).count("email")
    .distinct()
    .execute()

//SELECT COUNT(DISTINCT TestUser.email) AS count_rows FROM custom.users AS TestUser        

SELECT WITH JOIN

const SelectQueryInfo = await Manager.build({
    table: "users_info",
    schema: "custom"
  }).select()
    .where('status', '=', 't')
    .order('created_at', 'DESC')

const SelectQueryAddress = await Manager.build({
    table: "users_address",
    schema: "custom"
  }).select(["*"])
    .where('number', '=', '100')

const Users = await Manager.build({
    table: "users",
    alias: "Testusers",
    schema: "custom"
  }).select(["email", "first_name", "last_name AS FN"])
    .innerJoin(SelectQueryInfo, 'id', 'users_id')
    .leftJoin(SelectQueryAddress, 'id', 'users_id')
    .where('first_name', '=', 'first_name_test')
    .whereIsNull('last_name')
    .execute()

//SELECT Testusers.email, Testusers.first_name, Testusers.last_name AS FN, users_address.* FROM custom.users AS Testusers INNER JOIN custom.users_info AS users_info ON Testusers.id = users_info.users_id LEFT JOIN custom.users_address AS users_address ON Testusers.id = users_address.users_id WHERE Testusers.first_name = $1 AND Testusers.last_name IS NULL AND users_info.status = $2 AND users_address.number = $3 ORDER BY users_info.created_at DESC 


const Users = await Manager.build({
    table: "users",
    alias: "Testusers",
    schema: "custom"
  }).select(["email", "first_name", "last_name AS FN"])
    .innerJoin(SelectQueryInfo, 'id', 'users_id')
    .leftJoin(SelectQueryAddress, 'id', 'users_id')
    .where('id', '=', {
      builder: SelectQueryInfo,
      field: 'users_id'
    })
    .execute()

//SELECT Testusers.email, Testusers.first_name, Testusers.last_name AS FN, users_address.* FROM custom.users AS Testusers INNER JOIN custom.users_info AS users_info ON Testusers.id = users_info.users_id LEFT JOIN custom.users_address AS users_address ON Testusers.id = users_address.users_id WHERE Testusers.id = users_info.users_id AND users_info.status = $1 AND users_address.number = $2 ORDER BY users_info.created_at DESC     

INSERT

const data = {
  email: 'test@test.com',
  first_name: 'Test',
  last_name: null
}

const Users = await Manager.build({
    table: "users",
    schema: "custom"
  }).insert(data)
  .returning()
  .execute()

//INSERT INTO custom.user AS user (email, first_name, last_name) VALUES ($1, $2, NULL) RETURNING user.*


const Users = await Manager.build({
    table: "users",
    schema: "custom"
  }).insert(data)
  .onConflict(['email'])
  .doNothing()
  .returning()
  .execute()

//INSERT INTO custom.user AS user (email, first_name, last_name) VALUES ($1, $2, NULL) ON CONFLICT (email) DO NOTHING RETURNING user.*


const Users = await Manager.build({
    table: "users",
    schema: "custom"
  }).insert(data)
  .onConflict(['email'])
  .doUpdate(['email', 'first_name', 'last_name'])
  .returning()
  .execute()

//INSERT INTO custom.user AS user (email, first_name, last_name) VALUES ($1, $2, NULL) ON CONFLICT (email) DO UPDATE SET email = $2, first_name = $3, last_name = NULL WHERE user.email = $2 RETURNING user.*

UPDATE

const data = {
  email: 'test1@test.com',
  first_name: 'Test1',
  last_name: null
}

const Users = await Manager.build({
    table: "users",
    schema: "custom"
  }).update(data)
  .where("id", "=", "123")
  .execute()

//UPDATE custom.users AS users SET email = $1, first_name = $2, last_name = NULL WHERE users.id = $3

UPDATE WITH JOIN

const data = {
    email: 'test@test.a.a',
    first_name: {
      builder: SelectQueryInfo,
      field: 'users_id',
    }
}

const SelectQuery = Manager.build({
      table: "user",
      alias: "TestUser",
      schema: "custom"
  }).update(data)
    .innerJoin(SelectQueryInfo, 'id', 'users_id')
    .where("id", "=", "123")
    .returning(['email'])
    .execute()

//UPDATE custom.user AS TestUser SET email = $1, first_name = users_info.users_id FROM custom.users_info AS users_info WHERE TestUser.id = $2 AND TestUser.id = users_info.users_id RETURNING TestUser.email    

DELETE

const Users = await Manager.build({
    table: "users",
    schema: "custom"
  }).delete()
  .where("id", "=", "123")
  .execute()

//DELETE FROM custom.users AS users WHERE users.id = $1

DELETE WITH JOIN

const Users = await Manager.build({
    table: "users",
    schema: "custom"
  }).delete()
  .join(SelectQueryInfo, 'id', 'users_id')
  .where("id", "=", "123")
  .execute()

//DELETE FROM custom.users AS users USING custom.users_info AS users_info WHERE users.id = $1 AND TestUser.id = users_info.users_id

TRANSACTION

await Manager.begin()

await Manager.build({
    table: "users",
    schema: "custom"
  }).delete()
  .where("id", "=", "1233")
  .execute()

await Manager.build({
    table: "users",
    schema: "custom"
  }).delete()
  .where("id", "=", "1234")
  .execute()  

await Manager.commit() // or await Manager.rollback()

RAW QUERY

const Manager = require('@5no/pg-builder')

const SelectQueryInfo = await Manager.query("SELECT Testusers.email, Testusers.first_name, Testusers.last_name AS FN, users_address.* FROM custom.users AS Testusers INNER JOIN custom.users_info AS users_info ON Testusers.id = users_info.users_id LEFT JOIN custom.users_address AS users_address ON Testusers.id = users_address.users_id WHERE Testusers.first_name = $1 AND users_info.status = $2 AND users_address.number = $3 ORDER BY users_info.created_at DESC", [
  "one",
  "two",
  "three"
])

//SELECT Testusers.email, Testusers.first_name, Testusers.last_name AS FN, users_address.* FROM custom.users AS Testusers INNER JOIN custom.users_info AS users_info ON Testusers.id = users_info.users_id LEFT JOIN custom.users_address AS users_address ON Testusers.id = users_address.users_id WHERE Testusers.first_name = $1 AND users_info.status = $2 AND users_address.number = $3 ORDER BY users_info.created_at DESC 

License

MIT Licensed, Copyright (c) 2018 Aleksandr Sokol