MySql連接數據庫

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class DBHelper {
	public Connection conn;

	public Connection openConn() {
		String url = "jdbc:mysql://localhost:3306/book?useUnicode=true&characterEncoding=UTF-8";
		try {
			if (conn==null||conn.isClosed()) {
				Class.forName("com.mysql.jdbc.Driver");
				conn = DriverManager.getConnection(url, "root", "123");
			}
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return conn;
	}

	public void closeConn() {
		try {
			if (conn!=null&&!conn.isClosed()) {
				conn.close();
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}
}