HarmonyOS 鸿蒙Next数据查询resultSet.columnNames的列名为空

public queryMsgType(callBack: (data: Array<string>) => void) {
  let msgTypes: Array<string> = new Array<string>()
  let sql: StringBuilder = new StringBuilder();
  sql.append(" select distinct MESSAGETYPE from “);
  sql.append(DBConstants.TABLE_NAME_MESSAGE_LIST);
  sql.append(” where IS_DELETE = ‘0’ ");

  dbHelper.getDBStore((success, store) => {
    if (success) {
      store.querySql(sql.toString(), (err: BusinessError, resultSet) => {
        if (err) {
          YTLog.error(this.TAG, err.message)
        } else {

          while (resultSet.goToNextRow()) {
            YTLog.error(this.TAG, “queryMsgType2==” + resultSet.getColumnName(0))
            YTLog.error(this.TAG, “queryMsgType2==” + JSON.stringify(resultSet))
            let type = resultSet.getString(resultSet.getColumnIndex(‘MESSAGETYPE’))
            msgTypes.push(type)
          }
          YTLog.error(this.TAG, “queryMsgType2==” + JSON.stringify(msgTypes))

          callBack!(msgTypes)
        }
      })
    }
  })
}