// Inc increments the integer value at key. If the key does not exist it will
// be created with an initial value of 0 which will then be incremented. If the
// key exists but was set using Put or CPut an error will be returned.
//
// A new result will be appended to the batch which will contain a single row
// and Result.Err will indicate success or failure.
//
// key can be either a byte slice, a string, a fmt.Stringer or an
// encoding.BinaryMarshaler.
func (b *Batch) Inc(key interface{}, value int64) {
k, err := marshalKey(key)
if err != nil {
b.initResult(0, 1, err)
return
}
b.calls = append(b.calls, proto.IncrementCall(proto.Key(k), value))
b.initResult(1, 1, nil)
}
// IncStruct increments the specified column in the structured table identify
// by obj. The primary key columns within obj are used to identify which row to
// modify. The obj type must have previously been bound to a table using
// BindModel.
func (b *Batch) IncStruct(obj interface{}, value int64, column string) {
v := reflect.ValueOf(obj)
m, err := b.DB.getModel(v.Type(), true)
if err != nil {
b.initResult(0, 0, err)
return
}
v = reflect.Indirect(v)
primaryKey, err := m.encodePrimaryKey(v)
if err != nil {
b.initResult(0, 0, err)
return
}
col, ok := m.columnsByName[strings.ToLower(column)]
if !ok {
b.initResult(0, 0, fmt.Errorf("%s: unable to find column %s", m.name, column))
return
}
key := m.encodeColumnKey(primaryKey, col.ID)
if log.V(2) {
log.Infof("Inc %q", key)
}
c := proto.IncrementCall(proto.Key(key), value)
c.Post = func() error {
reply := c.Reply.(*proto.IncrementResponse)
// TODO(pmattis): This isn't very efficient. Should be able to pass the
// integer value directly instead of encoding it into a []byte.
pv := &proto.Value{}
pv.SetInteger(reply.NewValue)
return unmarshalValue(pv, v.FieldByIndex(col.field.Index))
}
b.calls = append(b.calls, c)
b.initResult(1, 1, nil)
}