jdbc连接数据库五步法PreparedStatement

1、加载驱动

Class.forName("com.mysql.jdbc.Driver");

2、获取连接

Connection conn = DriverManager.getConnection(url,username,password);

3、创建语句

String sql = "select * from abc where a = ?  and b = ? ";

PreparedStatement pstmt = conn.prepareStatement(sql);;

4、执行语句

pstmt.setString(1, "12");   //从1开始
pstmt.setString(2, "122");

ResultSet rs = pstmt.executeQuery();

5、处理ResultSet

while(rs.next()){
          rs.getString("url");
        }