请教一下 gorm 怎么查某个表的多条记录的指定几个字段,每个字段的值返回一个切片 - V2EX
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bronya0

请教一下 gorm 怎么查某个表的多条记录的指定几个字段,每个字段的值返回一个切片

  •  
  •   bronya0 May 31, 2022 1994 views
    This topic created in 1430 days ago, the information mentioned may be changed or developed.

    例如一个 user 表有 id 、name 、sex 、desc 四个字段,我想查最后 10 条记录,将十条记录的 name 、sex 、desc 各返回一个切片给我,请问有什么简便的方式嘛,我看官网有 Pluck 可以用,但是只能返回单个字段的切片

    10 replies    2022-06-01 14:39:26 +08:00
    johnlin
        1
    johnlin  
       May 31, 2022
    遍历然后自己重新组
    2024
        2
    2024  
       May 31, 2022
    可以用这个工具生成 orm , https://github.com/go-home-admin/toolset
    直接生成对应函数
    type UsersList []*Users

    func (l UsersList) GetIdList() []int64 {}
    func (l UsersList) GetIdMap() map[int64]*Users {}
    chengxiao data-uid=
        3
    chengxiao  
       May 31, 2022
    type Result strut {

    Name string
    Sex int
    Desc string

    }

    var result Result

    err = db.Table("user").Select("name,sex,desc").Limit(10).Order("id DESC").Find(&result).Error
    chengxiao
        4
    chengxiao  
       May 31, 2022
    @chengxiao struct 没补齐,都不会拼字母了哈,
    2024
        5
    2024  
       May 31, 2022
    @johnlin 每次都重新写太麻烦了, 获取 id 列表,或者 id map 基本是经常用到的,直接生成放着完事。
    看我生成的例子
    https://github.com/go-home-admin/go-admin/blob/main/app/entity/demo/user.go
    ScepterZ
        6
    ScepterZ  
       May 31, 2022
    希望 go 以后能.map(_.name).toList
    bronya0
        7
    bronya0  
    OP
       May 31, 2022
    @chengxiao 不是这样写啦,我测了这是返回一个切片,其中每个元素是一条数据库记录,只有 Select 的才查其他是零值。我的需求是将多个记录的某个字段组成一个切片,目前就是循环每个记录将制定字段装到一个切片里,这样的方法
    Mitt
        8
    Mitt  
       May 31, 2022
    @bronya0 #7 var result []map[string]interface{}

    然后按 1L 说的自己重新切片
    LoNeFong
        9
    LoNeFong  
       Jun 1, 2022
    尝试下别人的实现: https://github.com/jucardi/go-streams
    fighterlyt
        10
    fighterlyt  
       Jun 1, 2022 via Android
    Pluck
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