Method: UnQLite::Database#fetch

Defined in:
ext/unqlite/unqlite_database.c

#fetch(collection_name) ⇒ Object 



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# File 'ext/unqlite/unqlite_database.c', line 96

static VALUE unqlite_database_fetch(VALUE self, VALUE collection_name)
{
  void *c_collection_name;
  void *fetched_data;
  unqlite_int64 n_bytes;
  int rc;
  unqliteRubyPtr ctx;

  // Ensure the given argument is a ruby string
  Check_Type(collection_name, T_STRING);

  // Get class context
  Data_Get_Struct(self, unqliteRuby, ctx);

  // Transform Ruby string into C string
  c_collection_name = calloc(RSTRING_LEN(collection_name), sizeof(char));
  memcpy(c_collection_name, StringValuePtr(collection_name), RSTRING_LEN(collection_name));

  // Extract the data size, check for errors and return if any
  rc = unqlite_kv_fetch(ctx->pDb, c_collection_name, -1, NULL, &n_bytes);
  CHECK(ctx->pDb, rc);
  if( rc != UNQLITE_OK ) { return Qnil; }

  // Data is empty
  fetched_data = (char *)malloc(n_bytes);
  if( fetched_data == NULL ) { return rb_str_new2(""); }

  // Now, fetch the data
  rc = unqlite_kv_fetch(ctx->pDb, c_collection_name, -1, fetched_data, &n_bytes);
  CHECK(ctx->pDb, rc);

  return rb_str_new2((char *)fetched_data);
}