Esempi in C++ (Cpp) per NdbBlob::setNull

Esempio n. 1

int HugoOperations::setValueForAttr(NdbOperation* pOp,
				      int attrId, 
				      int rowId,
				      int updateId){
  const NdbDictionary::Column* attr = tab.getColumn(attrId);     
  
  if (! (attr->getType() == NdbDictionary::Column::Blob))
  {
    int len = attr->getSizeInBytes();
    char buf[NDB_MAX_TUPLE_SIZE];
    memset(buf, 0, sizeof(buf));
    Uint32 real_len;
    const char * value = calc.calcValue(rowId, attrId,
                                        updateId, buf, len, &real_len);
    return pOp->setValue( attr->getName(), value, real_len);
  }
  else
  {
    char buf[32000];
    int len = (int)sizeof(buf);
    Uint32 real_len;
    const char * value = calc.calcValue(rowId, attrId,
                                        updateId, buf, len, &real_len);
    NdbBlob * b = pOp->getBlobHandle(attrId);
    if (b == 0)
      return -1;

    if (real_len == 0)
      return b->setNull();
    else
      return b->setValue(value, real_len);
  }
}