6.3 Fetching Results

The API for fetching result sets is identical for (simple) statements and prepared statements. If your query returns one result set, use sql::Statement::executeQuery() or sql::PreparedStatement::executeQuery() to run your query. Both methods return sql::ResultSet objects. By default, Connector/C++ buffers all result sets on the client to support cursors.

// ...
sql::Connection *con;
sql::Statement *stmt;
sql::ResultSet  *res;
// ...
stmt = con->createStatement();
// ...

res = stmt->executeQuery("SELECT id, label FROM test ORDER BY id ASC");
while (res->next()) {
  // You can use either numeric offsets...
  cout << "id = " << res->getInt(1); // getInt(1) returns the first column
  // ... or column names for accessing results.
  // The latter is recommended.
  cout << ", label = '" << res->getString("label") << "'" << endl;
}

delete res;
delete stmt;
delete con;

Note

In the preceding code snippet, column indexing starts from 1.

Note

You must free the sql::Statement, sql::Connection, and sql::ResultSet objects explicitly using delete.

Cursor usage is demonstrated in the examples contained in the download package.