bool CWalletDB::ReadAccount(const string& strAccount, CAccount& account)
{
    account.SetNull();
    return Read(make_pair(string("acc"), strAccount), account);
}
bool WalletBatch::ReadAccount(const std::string& strAccount, CAccount& account)
{
    account.SetNull();
    return m_batch.Read(std::make_pair(std::string("acc"), strAccount), account);
}