gorm,update zero value

db.Select("*").Omit("CreatedAt").Updates(d)

=>will update zero values in d 

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golang gorm update when record not exist

when record is not exist. update will be success.
have to check RowsAffected .
the same as delte

query := db.Model(r).Updates(something)
if query.Error != nil {
   return query.Error
}
if query.RowsAffected == 0 {
   return gorm.ErrRecordNotFound
}

query := db.Delete(&something{ID: ID})
if query.Error != nil {
   return query.Error
}
if query.RowsAffected == 0 {
   return gorm.ErrRecordNotFound
}

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gorm transaction

TransactionsTo perform a set of operations within a transaction, the general flow is as below.

// begin a transaction

tx := db.Begin()

// do some database operations in the transaction (use 'tx' from this point, not 'db')

tx.Create(...)

// ...

// rollback the transaction in case of error

tx.Rollback()

// Or commit the transaction

tx.Commit()

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