bcollection.cpp

これは C++ で書かれたコレクションの使用例です。

#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#include <stdint.h>
#include <string>
 
#include "btrieveCpp.h"
 
static char *btrieveCollectionName = (char *)"squaresAndSquareRoots.btr";
 
#define MIN_X 0
#define MAX_X 255
 
static Btrieve::StatusCode
createCollection(BtrieveClient *btrieveClient)
{
   Btrieve::StatusCode status;
 
   // If CollectionCreate() fails.
   if ((status = btrieveClient->CollectionCreate(btrieveCollectionName)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveClient::CollectionCreate():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
leave:
   return status;
}
 
static Btrieve::StatusCode
openCollection(BtrieveClient *btrieveClient, BtrieveCollection *btrieveCollection)
{
   Btrieve::StatusCode status;
 
   // If CollectionOpen() fails.
   if ((status = btrieveClient->CollectionOpen(btrieveCollection, btrieveCollectionName)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveClient::CollectionOpen():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
leave:
   return status;
}
 
static Btrieve::StatusCode
loadCollection(BtrieveCollection *btrieveCollection)
{
   Btrieve::StatusCode status = Btrieve::STATUS_CODE_NO_ERROR;
   int i;
   char json[1024];
   int iSquared;
   double iSquareRoot;
 
   for (i = MIN_X; i <= MAX_X; i++)
   {
      iSquared = i * i;
      iSquareRoot = sqrt((double)i);
      snprintf(json, sizeof(json), 
         "{ \"x\": %d, \"xSquared\": %d, \"xSquareRoot\": %f, \"text\": \"The square of %d is %d and its square root is %f.\" }", 
         i, iSquared, iSquareRoot, i, iSquared, iSquareRoot);
      json[sizeof(json) - 1] = '\0';
 
      // If DocumentCreate() fails.
      if (btrieveCollection->DocumentCreate(json) < 0)
      {
         status = btrieveCollection->GetLastStatusCode();
         printf("Error: BtrieveCollection::DocumentCreate():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
         goto leave;
      }
   }
 
leave:
   return status;
}
 
static Btrieve::StatusCode
closeCollection(BtrieveClient *btrieveClient, BtrieveCollection *btrieveCollection)
{
   Btrieve::StatusCode status;
 
   // If CollectionClose() fails.
   if ((status = btrieveClient->CollectionClose(btrieveCollection)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveClient::CollectionClose():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
leave:
   return status;
}
 
static Btrieve::StatusCode
deleteCollection(BtrieveClient *btrieveClient)
{
   Btrieve::StatusCode status;
 
   // If CollectionDelete() fails.
   if ((status = btrieveClient->CollectionDelete(btrieveCollectionName)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveClient::CollectionDelete():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
leave:
   return status;
}
 
static Btrieve::StatusCode
retrieveDocument(BtrieveCollection *btrieveCollection, const char *key)
{
   Btrieve::StatusCode status = Btrieve::STATUS_CODE_NO_ERROR;
   std::string query;
   BtrieveDocumentSet btrieveDocumentSet;
   int size;
   int id;
   const char *json;
 
   query = "{ \"x\": ";
   query = query + key;
   query = query + "}";
 
   // If Query() fails.
   if ((status = btrieveCollection->Query(&btrieveDocumentSet, query.c_str())) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveCollection::Query():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
   if ((size = btrieveDocumentSet.Size()) < 0)
   {
      status = btrieveDocumentSet.GetLastStatusCode();
      printf("Error: BtrieveDocumentSet::Size():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
   if (size != 1)
   {
      printf("Error: BtrieveDocumentSet::Size():%d:%s.\n", size, "Unexpected size.  Size should be one.");
      goto leave;
   }
 
   if ((id = btrieveDocumentSet.PopFirst()) < 0)
   {
      status = btrieveDocumentSet.GetLastStatusCode();
      printf("Error: BtrieveDocumentSet::PopFirst():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
   // If DocumentRetrieveJson() fails.
   if ((json = btrieveCollection->DocumentRetrieveJson(id)) == NULL)
   {
      status = btrieveCollection->GetLastStatusCode();
      printf("Error: BtrieveCollection::DocumentRetrieveJson():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
   printf("json: %s\n", json);
 
leave:
   return status;
}
 
int
main(int argc, char *argv[])
{
   static const char *usage = "Usage: %s uint8_value\n";
 
   BtrieveClient btrieveClient;
   Btrieve::StatusCode status = Btrieve::STATUS_CODE_UNKNOWN;
   BtrieveCollection btrieveCollection;
   const char *key;
   uint64_t integerValue;
 
   // If the incorrect number of arguments were given.
   if (argc != 2)
   {
      printf(usage, argv[0]);
      goto leave;
   }
 
   integerValue = atoi(argv[1]);
 
   // If integerValue is out of range.
   if ((integerValue < MIN_X) || (integerValue > MAX_X))
   {
      printf(usage, argv[0]);
      goto leave;
   }
 
   key = argv[1];
 
   // If createCollection() fails.
   if ((status = createCollection(&btrieveClient)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      goto leave;
   }
 
   // If openCollection() fails.
   if ((status = openCollection(&btrieveClient, &btrieveCollection)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      goto leave;
   }
 
   // If loadCollection() fails.
   if ((status = loadCollection(&btrieveCollection)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      goto leave;
   }
 
   // If retrieveDocument() fails.
   if ((status = retrieveDocument(&btrieveCollection, key)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      goto leave;
   }
 
   // If closeCollection() fails.
   if ((status = closeCollection(&btrieveClient, &btrieveCollection)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      goto leave;
   }
 
   // If deleteCollection() fails.
   if ((status = deleteCollection(&btrieveClient)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      goto leave;
   }
 
leave:
   // If there wasn't a failure.
   if (status == Btrieve::STATUS_CODE_NO_ERROR)
      return 0;
 
   return 1;
}