英文:
Getting Data in PostgreSQL Gorm
问题
我有以下模型:
package models
import "github.com/lib/pq"
type Guild struct {
Id string `json:"id" gorm:"primaryKey"`
DefaultBitrate int `json:"defaultBitrate"`
DefaultState string `json:"defaultState"`
DefaultCategory string `json:"defaultCategory"`
DefaultUserLimit int `json:"defaultUserLimit"`
HelpChannel string `json:"helpChannel"`
Generators pq.StringArray `json:"generators" gorm:"type:text[]"`
Channels pq.StringArray `json:"channels" gorm:"type:text[]"`
}
函数文件:
func (h handler) CreateGuild(guildid string) error {
guild := &models.Guild{
Id: guildid,
DefaultBitrate: "64",
}
if result := h.DB.Create(&guild); result.Error != nil {
return result.Error
}
return nil
}
func (h handler) GetGuild(guildid string) (models.Guild, error) {
var guild models.Guild
if result := h.DB.First(&guild, guildid); result.Error != nil {
return guild, result.Error
}
return guild, nil
}
所以我首先创建一个公会,然后尝试使用相同的ID获取它,但是我在控制台中没有得到任何日志记录。
Database := db.Init()
h := dbhandlers.New(Database)
data, err := h.GetGuild("71728137382983743892")
fmt.Print(data.DefaultBitrate)
Github: https://github.com/apidev234/abred
注意:我已经创建了这样的公会:
err := h.CreateGuild("71728137382983743892")
调试信息:
2022/03/24 13:37:23 /Users/gaurish/Desktop/Coding/TempVC-Bot/database/handlers/Functions.go:12 SLOW SQL >= 200ms
[1126.461ms] [rows:1] INSERT INTO "guilds" ("id","default_bitrate","default_state","default_category","default_user_limit","help_channel") VALUES ('ASDHA','64','','',0,'')
2022/03/24 13:37:44 /Users/gaurish/Desktop/Coding/TempVC-Bot/database/handlers/Functions.go:19 ERROR: column "asdha" does not exist (SQLSTATE 42703)
[229.439ms] [rows:0] SELECT * FROM "guilds" WHERE ASDHA ORDER BY "guilds"."id" LIMIT 1
数组:
func (h Handler) NewGenerator(guildid string, channelid string) {
guild := models.Guild{
Id: guildid,
}
if result := h.DB.First(&guild, "id = ?", guildid).Update("generators", append(guild.Generators, channelid)); result.Error != nil {
return
}
}
英文:
I Have my model as follows:
package models
import "github.com/lib/pq"
type Guild struct {
Id string `json:"id" gorm:"primaryKey"`
DefaultBitrate int `json:"defaultBitrate"`
DefaultState string `json:"defaultState"`
DefaultCategory string `json:"defaultCategory"`
DefaultUserLimit int `json:"defaultUserLimit"`
HelpChannel string `json:"helpChannel"`
Generators pq.StringArray `json:"generators" gorm:"type:text[]"`
Channels pq.StringArray `json:"channels" gorm:"type:text[]"`
}
Functions File:
func (h handler) CreateGuild(guildid string) error {
guild := &models.Guild{
Id: guildid,
DefaultBitrate: "64",
}
if result := h.DB.Create(&guild); result.Error != nil {
return result.Error
}
return nil
}
func (h handler) GetGuild(guildid string) (models.Guild, error) {
var guild models.Guild
if result := h.DB.First(&guild, guildid); result.Error != nil {
return guild, result.Error
}
return guild, nil
}
So What i do is i create a guild first and then try to get it with the same id yet i don't get anything logged in the console
Database := db.Init()
h := dbhandlers.New(Database)
data, err := h.GetGuild("71728137382983743892")
fmt.Print(data.DefaultBitrate)
Github: https://github.com/apidev234/abred
Note: I have already created the guild as such:
err := h.CreateGuild("71728137382983743892")
Debugs:
2022/03/24 13:37:23 /Users/gaurish/Desktop/Coding/TempVC-Bot/database/handlers/Functions.go:12 SLOW SQL >= 200ms
[1126.461ms] [rows:1] INSERT INTO "guilds" ("id","default_bitrate","default_state","default_category","default_user_limit","help_channel") VALUES ('ASDHA','64','','',0,'')
2022/03/24 13:37:44 /Users/gaurish/Desktop/Coding/TempVC-Bot/database/handlers/Functions.go:19 ERROR: column "asdha" does not exist (SQLSTATE 42703)
[229.439ms] [rows:0] SELECT * FROM "guilds" WHERE ASDHA ORDER BY "guilds"."id" LIMIT 1
Array:
func (h Handler) NewGenerator(guildid string, channelid string) {
guild := models.Guild{
Id: guildid,
}
if result := h.DB.First(&guild, "id = ?", guildid).Update("generators", append(guild.Generators, channelid)); result.Error != nil {
return
}
}
答案1
得分: 1
当使用非数字主键的First
方法时,您需要明确指定要与主键匹配的列。
官方文档(https://gorm.io/docs/query.html#Retrieving-objects-with-primary-key)中提到:
如果主键是字符串(例如,像uuid一样),查询将如下所示:
db.First(&user, "id = ?", "1b74413f-f3b8-409f-ac47-e8c062e3472a") // SELECT * FROM users WHERE id = "1b74413f-f3b8-409f-ac47-e8c062e3472a";
所以在GetGuild
函数中,这段代码:
h.DB.First(&guild, guildid)
应该改为:
h.DB.First(&guild, "id = ?", guildid)
英文:
When using First
with non-number primary keys you need to explicitly specify the column against which you want to match the primary key.
Official docs:
> If the primary key is a string (for example, like a uuid), the query
> will be written as follows:
>
> ```go
> db.First(&user, "id = ?", "1b74413f-f3b8-409f-ac47-e8c062e3472a")
> // SELECT * FROM users WHERE id = "1b74413f-f3b8-409f-ac47-e8c062e3472a";
So in GetGuild
this:
h.DB.First(&guild, guildid)
should be this:
h.DB.First(&guild, "id = ?", guildid)
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库,让每个人都能够通过互相帮助和分享经验来进步。
评论