private int ParseSQL()
        {
            string        sql        = txtSQL.Text;
            string        err        = string.Empty;
            List <Column> columnList = SQLManager.ParseSQLToColumns(sql, ref err);

            if (columnList == null)
            {
                ToBeFront();
                WindowManager.ShowToolTip(txtSQL, "解析出错。原因:\n" + err, txtSQL.Location);
                return(-1);
            }
            string            strTemp        = cmbDefaultValue.Text;
            List <BaseObject> baseObjectList = ListManager.ColumnListToBaseObjectList(columnList);

            cmbDefaultValue.SetItems(baseObjectList);
            cmbDefaultValue.Text = strTemp;
            return(1);
        }