public JDBCConnect() {
        String driver = "com.mysql.jdbc.Driver";
        String artlcle_url = "jdbc:mysql://localhost:3306/zhangyu_sca";
        String user = "root";
        String password = "root";
        try {
            Class.forName(driver);
            Connection article_conn = DriverManager.getConnection(artlcle_url, user, password);

            if (article_conn.isClosed()) {
                System.out.println("False connect database");
            }

            article_ste = article_conn.createStatement();
            tags_ste = article_conn.createStatement();
            content_ste = article_conn.createStatement();
            article_url = article_conn.createStatement();

        } catch (Exception e) {
            e.printStackTrace();
        }
    }