Support for returning

[mfbx9da4]

As far as I can tell there is no way to return anything other than the rowId inserted from an UPDATE or INSERT statement. That would be useful in my use case. eg

let alice = users.filter(id == 1)
let row = try db.run(alice.update(email <- "alice@me.com").returning(users[*]))

[dmitrygusev]

FYI here's how it can be solved for a simple case:

extension Insert {
    func returning(_ columns: [Expression<Int64>]) -> Insert {
        var template = self.template
        let bindings = self.bindings
        
        template.append(" RETURNING ")
        template.append(columns.map { column in column.expression.template }.joined(separator: ", "))
        
        let insert = Insert(template, bindings)
        
        return insert
    }
}

...
let insert = table1.insert(...).returning([col1, col2])

if let results = try? db().prepareRowIterator(insert.template, bindings: insert.bindings) {
   // handle results as usual
}