// call PQexec
internal ExecStatusType Exec(byte[] stmt, out IntPtr res)
{
if (mConnection == IntPtr.Zero)
{
res = IntPtr.Zero;
return(ExecStatusType.PGRES_FATAL_ERROR);
}
unsafe
{
fixed(byte *st = stmt)
{
res = PqsqlWrapper.PQexec(mConnection, st);
}
}
ExecStatusType s = ExecStatusType.PGRES_FATAL_ERROR;
if (res != IntPtr.Zero)
{
s = PqsqlWrapper.PQresultStatus(res);
}
return(s);
}
private static bool DiscardConnection(IntPtr conn)
{
if (conn == IntPtr.Zero)
{
return(false);
}
bool rollback = false;
ConnStatusType cs = PqsqlWrapper.PQstatus(conn);
if (cs != ConnStatusType.CONNECTION_OK)
{
return(false); // connection broken
}
PGTransactionStatusType ts = PqsqlWrapper.PQtransactionStatus(conn);
switch (ts)
{
case PGTransactionStatusType.PQTRANS_INERROR: /* idle, within failed transaction */
case PGTransactionStatusType.PQTRANS_INTRANS: /* idle, within transaction block */
rollback = true;
break;
case PGTransactionStatusType.PQTRANS_IDLE: /* connection idle */
// nothing to do
break;
// PGTransactionStatusType.PQTRANS_ACTIVE: /* command in progress */
// PGTransactionStatusType.PQTRANS_UNKNOWN: /* cannot determine status */
default:
return(false); // connection broken
}
IntPtr res;
ExecStatusType s = ExecStatusType.PGRES_FATAL_ERROR;
// we need to rollback before we can discard the connection
if (rollback)
{
unsafe
{
fixed(byte *st = PqsqlTransaction.RollbackStatement)
{
res = PqsqlWrapper.PQexec(conn, st);
if (res != IntPtr.Zero)
{
s = PqsqlWrapper.PQresultStatus(res);
PqsqlWrapper.PQclear(res);
}
}
}
if (s != ExecStatusType.PGRES_COMMAND_OK)
{
return(false); // connection broken
}
s = ExecStatusType.PGRES_FATAL_ERROR;
}
// discard connection
unsafe
{
fixed(byte *st = DiscardAllStatement)
{
res = PqsqlWrapper.PQexec(conn, st);
if (res != IntPtr.Zero)
{
s = PqsqlWrapper.PQresultStatus(res);
PqsqlWrapper.PQclear(res);
}
}
}
if (s != ExecStatusType.PGRES_COMMAND_OK)
{
return(false); // connection broken
}
return(true); // connection successfully resetted
}
