CDbFta db; // CDatabase db;

int m_TreeID = ...;
int ipart = 1;
int szPart = 16;

char* buf = (char*)malloc(szData + 1);

... заполнение буфера

sql.Format("INSERT INTO Diagrams (treeId, partNb, size, part) VALUES(%d, %d, %d, ? );", m_TreeID, ipart, szPart);

db.setBindParameters((BYTE*)frBuf, szPart, sql);

db.ExecuteSQL(sql);

class CDbFta : public CDatabase
{
public:
	unsigned char*   m_pabImage;  // address of the data of the blob  //BYTE*
	int     m_nImageLen; // sizeof the data in the image, in bytes
	CString m_sStmt;     // looks like "UPDATE MyTable SET myFld=? WHERE idxFld=123"

public:
	virtual void BindParameters(HSTMT hstmt);
	void setBindParameters(BYTE* pabImage, int nImageLen, CString sStmt);

	void clearBindParameters();
	void ReadRawData(SQLHSTMT v_SearchHandleIndex, int fieldNb, void* _Raw, SQLINTEGER& RawInd);
};

void CDbFta::setBindParameters(BYTE* pabImage, int nImageLen, CString sStmt)
{
	m_pabImage = pabImage;  // buffer;
	m_nImageLen = nImageLen;
	m_sStmt = sStmt;
}
void CDbFta::BindParameters(HSTMT hstmt)
{
	SQLINTEGER nLenOrInd = m_nImageLen;  // use SQL_NTS only for null-terminated string data
	SQLRETURN  rc;

	if(m_sStmt == "" || m_sStmt.Find("?") == -1) return;

	rc = SQLBindParameter(
		hstmt, (SQLSMALLINT)1, SQL_PARAM_INPUT, SQL_C_BINARY, SQL_VARBINARY,
		m_nImageLen, 0, (SQLPOINTER)m_pabImage, m_nImageLen, NULL);   // &nLenOrInd );
}