This is my model in go

package models

import (
"time"

"gorm.io/gorm"
 )

type VID uint

type CompanyNames struct {
Id   VID    `json:"id,omitempty"`
Name string `json:"name,omitempty"`
CreateDate time.Time `json:"CreateDate,omitempty"`
ModifyDate time.Time `json:"ModifyDate,omitempty"`

}

and this is my repo(that retrieve data from database):

func (m *Repo) Read(id models.VID) (*models.CompanyNames, error) {
var (
    cn = &models.CompanyNames{}
)
err := m.db.Debug().Table("CompanyNames").First(cn, &id).Error

if err != nil {
    return nil, err
}
return cn, err

}

On "http" I write this code with echo

func NewHttp(e *echo.Group, lg *Logic) {
g := e.Group("/companyname")
g.GET("", readAll)
g.GET("/:Id", read)

logic = lg
}

When I cal my ReadAll record rerieve data completly , it's mean I conected to database currectly,But whene I try get data by "id" got an error that :

mssql: Invalid column name 'id'.

Whet is my mistake another hand make id in my struct as a comment like this:>

type CompanyNames struct {
//Id   VID    `json:"id,omitempty"`
Name string `json:"name,omitempty"`
CreateDate time.Time `json:"CreateDate,omitempty"`
ModifyDate time.Time `json:"ModifyDate,omitempty"`
}

got new error that

mssql: Invalid column name 'name'. [2690.814ms] [rows:0] SELECT * FROM "CompanyNames" WHERE "CompanyNames"."name" = '1' ORDER BY "CompanyNames"."id" OFFSET 0 ROW FETCH NEXT 1 ROWS ONLY

Update:

func Cunnection() (*gorm.DB, error) { var ( err error db *gorm.DB ) dsn := "sqlserver://DbUser:[email protected]:1433?database=myDb"

db, err = gorm.Open(sqlserver.Open(dsn), &gorm.Config{})

if err != nil {
    return nil, err
}
// err = db.Debug().AutoMigrate(&models.CompanyNameModel{})
// if err != nil {
//  return nil, err
// }
return db, nil

}

CodePudding user response：

two ways for answer after check many ways

first of i must use Find insted of First another hand i try retrieve data by thse two ways

1:

err := m.db.Debug().Table("CompanyNames").Find(cn, "Id = ?", id).Error

2:

err := m.db.Debug().Table("CompanyNames").Find(cn, map[string]interface{}{
    "Id": Id,
}).Error

as reserach the beter way is the second way

CodePudding user response：

After reading your own answer, I found your question. As the comments above say, it's easier to find the problem if you show your table structure.

The column name specified by your query is Id and your structure does not explicitly specify this name. According to the Grom convention, your Id field will be converted into id. This problem can be solved by adding tags.

For example:

package models

import (
    "time"

    "gorm.io/gorm"
)

type VID uint

type CompanyNames struct {
    Id   VID    `json:"id,omitempty" gorm:"column:Id"`
    Name string `json:"name,omitempty" gorm:"column:Name"`
}