Melt butter in a Dutch oven over medium-high heat. Add tomato, shallots, salt, and garlic; sauté 3 minutes. Stir in wine and clam juice. Add clams; bring to a boil. Cover, reduce heat, and simmer 5 minutes or until shells begin to open. Stir in beans; cover and cook 2 minutes or until beans are crisp-tender. Remove from heat; stir in parsley. Serve immediately over pasta.