Function SQLFreeHandle

cpp/src/arrow/flight/sql/odbc/odbc_api.cc:139–207

}

SQLRETURN SQLFreeHandle(SQLSMALLINT type, SQLHANDLE handle) {
  ARROW_LOG(DEBUG) << "SQLFreeHandle called with type: " << type
                   << ", handle: " << handle;
  switch (type) {
    case SQL_HANDLE_ENV: {
      using ODBC::ODBCEnvironment;

      ODBCEnvironment* environment = reinterpret_cast<ODBCEnvironment*>(handle);

      if (!environment) {
        return SQL_INVALID_HANDLE;
      }

      delete environment;

      return SQL_SUCCESS;
    }

    case SQL_HANDLE_DBC: {
      using ODBC::ODBCConnection;

      ODBCConnection* conn = reinterpret_cast<ODBCConnection*>(handle);

      if (!conn) {
        return SQL_INVALID_HANDLE;
      }

      // `ReleaseConnection` does the equivalent of `delete`.
      // `ReleaseConnection` removes the connection `shared_ptr` from the `std::vector` of
      // connections, and the `shared_ptr` is automatically destructed afterwards.
      conn->ReleaseConnection();

      return SQL_SUCCESS;
    }

    case SQL_HANDLE_STMT: {
      using ODBC::ODBCStatement;

      ODBCStatement* statement = reinterpret_cast<ODBCStatement*>(handle);

      if (!statement) {
        return SQL_INVALID_HANDLE;
      }

      statement->ReleaseStatement();

      return SQL_SUCCESS;
    }

    case SQL_HANDLE_DESC: {
      using ODBC::ODBCDescriptor;

      ODBCDescriptor* descriptor = reinterpret_cast<ODBCDescriptor*>(handle);

      if (!descriptor) {
        return SQL_INVALID_HANDLE;
      }