🚀 go-pugleaf

My program connects to MySQL 4.1.7 using ADO components.
The connection string points to MyODBC 3.51.10 DSN (Anybody know
MySQL native OLEDB provider?). The table has only 4 fields where one
of them is BLOB. The next code inserts a new record and it raises 
EAccessViolation when a command executes. When Execute() is
removed/commented, no error.

    int bounds[2] = {0};
    cmd->Parameters->ParamByName("id")->Value = PacketID++;
    cmd->Parameters->ParamByName("ip")->Value = AnsiString(Buff->ip);
    bounds[1] = Buff->size - 1;
    Variant bytes = VarArrayCreate(bounds, 1, varByte);
    memcpy(bytes.ArrayLock(), Buff->data, Buff->size);
    bytes.ArrayUnlock();
    cmd->Parameters->ParamByName("data")->AppendChunk(bytes);
    cmd->Execute();

table stucture:

CREATE TABLE packets
(
  id INT NOT NULL,
  ts TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
  ip VARCHAR(15) NOT NULL,
  data BLOB NOT NULL,

  PRIMARY KEY (id)
);

CREATE INDEX packets_ts ON packets (ts);
CREATE INDEX packets_ip ON packets (ip);

P.S. Also, all 3 above parameters returned by TADOCommand are
ftString, Size=25165824, Attributes=paNullable, paLong. Why?
Does it mean that MyODBC and ADO do not understand each other?