// Summary:
// Attempts to cancels the execution of a System.Data.Common.DbCommand.
public override void Cancel()
{
if (mConn == null)
{
return;
}
ConnectionState s = mConn.State;
// no cancel possible/necessary if connection is closed / open / connecting / broken
if (s == ConnectionState.Closed || s == ConnectionState.Open || (s & (ConnectionState.Broken | ConnectionState.Connecting)) > 0)
{
return;
}
IntPtr cancel = PqsqlWrapper.PQgetCancel(mConn.PGConnection);
if (cancel != IntPtr.Zero)
{
sbyte[] buf = new sbyte[256];
string err;
unsafe
{
fixed(sbyte *b = buf)
{
int cret = PqsqlWrapper.PQcancel(cancel, b, 256);
PqsqlWrapper.PQfreeCancel(cancel);
if (cret == 1)
{
return;
}
err = PqsqlUTF8Statement.CreateStringFromUTF8(new IntPtr(b));
}
}
throw new PqsqlException("Could not cancel command «" + mCmdText + "»: " + err);
}
}