如何为GORM关闭IDENTITY_INSERT

Question

I would like to turn OFF the IDENTITY_INSERT to insert data with GORM without specify any ID.

I try this :

func main() {

    db, err := gorm.Open("mssql", "...")

    //...
    db.DropTable(&User{})
    db.CreateTable(&User{})
    db.Exec("SET IDENTITY_INSERT users OFF;") <-- this doesn't work

    for _, user := range users {
        db.Create(&user)
    }

}

type User struct {
    ID        uint
    UserName  string
    FirstName string
    LastName  string
}

var users []User = []User{
    User{UserName: "testUserName", FirstName: "testFirstName", LastName: "TestLastName"},
    User{UserName: "testUserName", FirstName: "testFirstName", LastName: "TestLastName"},
    User{UserName: "testUserName", FirstName: "testFirstName", LastName: "TestLastName"},
}

EDIT :

The data is not create in database, I have the following error (sorry in french) :

(mssql: Une valeur explicite doit être spécifiée dans la colonne d'identité de la table 'users' quand IDENTITY_INSERT est défini à ON, ou qu'un utilisateur de la réplication effectue une insertion dans une colonne d'identité NOT FOR REPLICATION.)

in en :

Cannot insert explicit value for identity column in table 'users' when IDENTITY_INSERT is set to OFF."

The program work if I add the ID value like :

User{ID: 1, UserName: "testUserName", FirstName: "testFirstName", LastName: "TestLastName"}

Someone have any idea ?

Answer 1

If you really need to do this, and there are rare cases for this you have to enable this functionality ( to set the value for identity column ) like so

Set Identity_Insert dbo.users On
Insert Into users (YOURIDENTITYCOLUMN, NAME)
Values(1, 'your value')
Set Identity_Insert dbo.users Off

If your not trying to set the value of the identity column, then remove the statement SET Identity_Insert dbo.users Off portion from your query.