Gorm获取列名

huangapple
go评论118阅读模式
英文:

Gorm get column name

问题

我在gorm中有以下模型：

  1. type Person struct {
  2. 	ID        uuid.UUID      `gorm:"type:uuid;default:uuid_generate_v4()"`
  3. 	Name      string         `gorm:"not null,type:text"`
  4. 	CreatedAt time.Time      `gorm:"autoCreateTime"`
  5. 	UpdatedAt time.Time      `gorm:"autoUpdateTime"`
  6. 	DeletedAt gorm.DeletedAt `gorm:"index->"`
  7. }

是否可以获取列名？我想要gorm将生成的列名。

英文:

I have the following model in gorm

  1. type Person struct {
  2. 	ID        uuid.UUID      `gorm:"type:uuid;default:uuid_generate_v4()"`
  3. 	Name      string         `gorm:"not null,type:text"`
  4. 	CreatedAt time.Time      `gorm:"autoCreateTime"`
  5. 	UpdatedAt time.Time      `gorm:"autoUpdateTime"`
  6. 	DeletedAt gorm.DeletedAt `gorm:"index,->"`
  7. }

Is it possible to get the column name? I want the column name that gorm will generate

答案1

得分: 5

可能的解决方案

解决方案是从模型中检索（"解析"）模式。
请注意：是从模型中检索，而不是从"物理"数据库中检索。

参考资料

草稿示例程序

go.mod

  1. module gorm/example
  3. go 1.18
  5. require (
  6.     github.com/google/uuid v1.3.0
  7.     gorm.io/gorm v1.23.8
  8. )
  10. require (
  11.     github.com/jinzhu/inflection v1.0.0 // indirect
  12.     github.com/jinzhu/now v1.1.4 // indirect
  13. )

go.sum

  1. github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
  2. github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
  3. github.com/jinzhu/inflection v1.0.0 h1:K317FqzuhWc8YvSVlFMCCUb36O/S9MCKRDI7QkRKD/E=
  4. github.com/jinzhu/inflection v1.0.0/go.mod h1:h+uFLlag+Qp1Va5pdKtLDYj+kHp5pxUVkryuEj+Srlc=
  5. github.com/jinzhu/now v1.1.4 h1:tHnRBy1i5F2Dh8BAFxqFzxKqqvezXrL2OW1TnX+Mlas=
  6. github.com/jinzhu/now v1.1.4/go.mod h1:d3SSVoowX0Lcu0IBviAWJpolVfI5UJVZZ7cO71lE/z8=
  7. gorm.io/gorm v1.23.8 h1:h8sGJ+biDgBA1AD1Ha9gFCx7h8npU7AsLdlkX0n2TpE=
  8. gorm.io/gorm v1.23.8/go.mod h1:l2lP/RyAtc1ynaTjFksBde/O8v9oOGIApu2/xRitmZk=

程序 (main.go)

  1. package main
  3. import (
  4.     "fmt"
  5.     "github.com/google/uuid"
  6.     "gorm.io/gorm"
  7.     "gorm.io/gorm/schema"
  8.     "sync"
  9.     "time"
  10. )
  12. type Person struct {
  13.     ID        uuid.UUID      `gorm:"type:uuid;default:uuid_generate_v4()"`
  14.     Name      string         `gorm:"not null,type:text"`
  15.     CreatedAt time.Time      `gorm:"autoCreateTime"`
  16.     UpdatedAt time.Time      `gorm:"autoUpdateTime"`
  17.     DeletedAt gorm.DeletedAt `gorm:"index->"`
  18. }
  20. func main() {
  21.     s, err := schema.Parse(&Person{}, &sync.Map{}, schema.NamingStrategy{})
  22.     if err != nil {
  23.         panic("failed to parse schema")
  24.     }
  26.     m := make(map[string]string)
  27.     for _, field := range s.Fields {
  28.         dbName := field.DBName
  29.         modelName := field.Name
  30.         m[modelName] = dbName
  31.     }
  33.     fmt.Println("Model to schema field name map:", m)
  34.     fmt.Println("CreatedAt field is mapped to", m["CreatedAt"], "column")
  35. }

构建

  1. $ go build main.go

运行

  1. $ ./main

输出

  1. Model to schema field name map: map[CreatedAt:created_at DeletedAt:deleted_at ID:id Name:name UpdatedAt:updated_at]
  2. CreatedAt field is mapped to created_at column
英文:

Possible solution

The solution is to retrieve («parse») the schema from the model.
Please, note: from the model — not from a «physical» database.

References

Draft example program

go.mod

  1. module gorm/example
  3. go 1.18
  5. require (
  6. 	github.com/google/uuid v1.3.0
  7. 	gorm.io/gorm v1.23.8
  8. )
  10. require (
  11. 	github.com/jinzhu/inflection v1.0.0 // indirect
  12. 	github.com/jinzhu/now v1.1.4 // indirect
  13. )

go.sum

  1. github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
  2. github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
  3. github.com/jinzhu/inflection v1.0.0 h1:K317FqzuhWc8YvSVlFMCCUb36O/S9MCKRDI7QkRKD/E=
  4. github.com/jinzhu/inflection v1.0.0/go.mod h1:h+uFLlag+Qp1Va5pdKtLDYj+kHp5pxUVkryuEj+Srlc=
  5. github.com/jinzhu/now v1.1.4 h1:tHnRBy1i5F2Dh8BAFxqFzxKqqvezXrL2OW1TnX+Mlas=
  6. github.com/jinzhu/now v1.1.4/go.mod h1:d3SSVoowX0Lcu0IBviAWJpolVfI5UJVZZ7cO71lE/z8=
  7. gorm.io/gorm v1.23.8 h1:h8sGJ+biDgBA1AD1Ha9gFCx7h8npU7AsLdlkX0n2TpE=
  8. gorm.io/gorm v1.23.8/go.mod h1:l2lP/RyAtc1ynaTjFksBde/O8v9oOGIApu2/xRitmZk=

Program (main.go)

  1. package main
  3. import (
  4.     "fmt"
  5.     "github.com/google/uuid"
  6.     "gorm.io/gorm"
  7.     "gorm.io/gorm/schema"
  8.     "sync"
  9.     "time"
  10. )
  12. type Person struct {
  13.     ID        uuid.UUID      `gorm:"type:uuid;default:uuid_generate_v4()"`
  14.     Name      string         `gorm:"not null,type:text"`
  15.     CreatedAt time.Time      `gorm:"autoCreateTime"`
  16.     UpdatedAt time.Time      `gorm:"autoUpdateTime"`
  17.     DeletedAt gorm.DeletedAt `gorm:"index,->"`
  18. }
  20. func main() {
  21.     s, err := schema.Parse(&Person{}, &sync.Map{}, schema.NamingStrategy{})
  22.     if err != nil {
  23.         panic("failed to parse schema")
  24.     }
  26.     m := make(map[string]string)
  27.     for _, field := range s.Fields {
  28.         dbName := field.DBName
  29.         modelName := field.Name
  30.         m[modelName] = dbName
  31.     }
  33.     fmt.Println("Model to schema field name map:", m)
  34.     fmt.Println("CreatedAt field is mapped to", m["CreatedAt"], "column")
  35. }

Build

  1. $ go build main.go

Run

  1. $ ./main

Output

  1. Model to schema field name map: map[CreatedAt:created_at DeletedAt:deleted_at ID:id Name:name UpdatedAt:updated_at]
  2. CreatedAt field is mapped to created_at column

答案2

得分: 1

使用标签的方式如下：

> gorm:"column:uid"

  1. type UserInfo struct {
  2. 	Uid       int       `json:"uid" gorm:"column:uid" form:"uid"` 
  3. 	Uname     string    `json:"uname" gorm:"column:uname" form:"uname"`
  4. }
英文:

use tag like this:

> gorm:"column:uid"

  1. type UserInfo struct {
  2. Uid       int       `json:"uid" gorm:"column:uid" form:"uid"` 
  3. Uname     string    `json:"uname" gorm:"column:uname" form:"uname"`
  4. }

huangapple
  • 本文由 发表于 2022年7月17日 05:40:57
  • 转载请务必保留本文链接：https://go.coder-hub.com/73007826.html
  • go
  • go-gorm
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