package xugu

import (
	"encoding/binary"
	"fmt"
)

type xuguResult struct {
	xgConn *xuguConn
	// Returns the number of rows affected
	// by update, delete and other related operations
	affectedRows int64

	// Returns the GUID number of
	// the insert operation (not supported)
	insertId int64
}

// LastInsertId returns the integer generated by the database
// in response to a command. Typically this will be from an
// "auto increment" column when inserting a new row. Not all
// databases support this feature, and the syntax of such
// statements varies.
func (result *xuguResult) LastInsertId() (int64, error) {
	sockSendPutStatement(result.xgConn, []byte("select last_insert_id();"), nil, 0)
	sockSendExecute(result.xgConn)
	//接收结果
	//recv msg
	aR, err := xuguSockRecvMsg(result.xgConn)
	if err != nil {
		return 0, err
	}

	switch aR.rt {
	case selectResult:

		return int64(binary.BigEndian.Uint64(aR.s.Values[0][0].Col_Data)), nil
	}

	return 0, fmt.Errorf("last insert id error")
}

// RowsAffected returns the number of rows affected by an
// update, insert, or delete. Not every database or database
// driver may support this.
func (result *xuguResult) RowsAffected() (int64, error) {
	return result.affectedRows, nil
}