Knex别名在哪里

时间:2018-11-12 12:19:20

标签: node.js postgresql knex.js

我使用knex查询我的后端

knex('project AS p')
 .select('p.name as projectName')
 .where('p.name', 'abc')

如果我使用p.name = 'abc',则代码有效

但是使用时出现错误:

.where(projectName, 'abc') 
.where(p.name, 'abc')
.where({projectName: abc})

我想使用别名查询不是p.name,因为前端发送请求时,为什么要发送?projectName ='abc'而不是'p.name'='abc'。你知道怎么做

示例

SELECT 
    cp.id AS cId,
    (CASE WHEN cp.id = 7 THEN 'abc' ELSE 'NOT abc' END) AS abc
FROM customer_project AS cp
;

我怎么这样查询

SELECT 
    cp.id AS cId,
    (CASE WHEN cp.id = 7 THEN 'abc' ELSE 'NOT abc' END) AS abc
FROM customer_project AS cp
WHERE abc = 'abc'
;

Got错误列abc不退出。但是我真的想在abc列上查询(尽管它不会在架构上退出,但我创建了它)

1 个答案:

答案 0 :(得分:0)

使用.toSQL()来检查knex会产生什么样的查询。您发布的示例无法正常运行(甚至存在语法错误),因此我无法确切地说出您在做什么错。

但是,它也可以与knex一起正常工作:

> const Knex = require('knex');
undefined
> const knex = Knex({
...   client: 'pg',
... });
undefined
> 
> console.log(
... knex('project AS p')
...  .select('p.name as projectName')
...  .where('p.name', 'abc')
...  .where('projectName', 'abc')
...  .toSQL()
... );
{ method: 'select',
  options: {},
  timeout: false,
  cancelOnTimeout: false,
  bindings: [ 'abc', 'abc' ],
  __knexQueryUid: 'c1a458e3-9fc4-4f9b-a206-eee7ecb5b897',
  sql: 'select "p"."name" as "projectName" from "project" as "p" where "p"."name" = ? and "projectName" = ?' }
undefined
> 

对我来说,生成SQL看起来还不错。