How can I retrieve instance of last added item

Question

I'm using github.com/jinzhu/gorm with a mysql backend. I want to retrieve the Id (or the full entity) of the row in the previous Create call.

As in, last-insert-id: (http://dev.mysql.com/doc/refman/5.0/en/information-functions.html#function_last-insert-id)

How can I do this?

Lamina

Answer 1

type User struct {
  Id int
  Name string
}

user := User{Name: "jinzhu"}
db.Save(&user)
// user.Id is set to last insert id

Pitt

I wasn't passing it as a pointer! It works well now. Meanwhile, thank you for a very useful library. – Lamina

Answer 2

Try as follows

type User struct {
  Id   int    `gorm:"column:id; PRIMARY_KEY" json:"id"`
  Name string `gorm:"column:name" json:"name"`
}

user := User{Name: "Andy"}
db.Save(&user)
// user.Id is set to last insert id

Genitourinary

Can't we do this via db.Create? – Litigable

@BalajiSrinivasan you can but Create insert the value into database and Save update value in database, if the value doesn't have primary key, will insert it – Genitourinary