简单连接数据库的重要语句

?private static final String driver = "oracle.jdbc.driver.OracleDriver";
?private static final String url = "jdbc:oracle:thin:@10.10.12.92:1521:orcl";
?private static final String userName = "ubas";
?private static final String password = "ubas";
?Connection conn = null;
??PreparedStatement pstmt = null;
??ResultSet rs = null;
??String sql = "select * from ...";
??????? try{
??conn = getConn();
??pstmt = conn.prepareStatement(sql);
??rs = pstmt.executeQuery();
??while (rs.next()) {
???id = rs.getString("id");?
???start = rs.getString("req_start_date");
?????
??}
??
??String updatesql = "update uba_user_behavior set req_end_date=to_date('"
????+ end_date
????+ "','yyyy-mm-dd hh24:mi:ss'),time_length='"
????+ jg_date
????+ "' where id='" + id + "'";
??System.out.println(updatesql);
??pstmt = conn.prepareStatement(updatesql);
??}
??????? }catch(Exception e){
??????? ?e.printStackTrace();
??????? }finally{
??????? ?closeAll(conn,pstmt,rs);
??????? }