动态SQL的第4种方法通过SQLDA（The SQL Descr iptor Area）和oracle内部交换数据，可以执行直到程序运行时还不知道选择表项或虚拟输入宿主变量的个数和类型的SQL语句-Dynamic SQL in the first four kinds of methods through the SQLDA (The SQL Descr iptor Area) and oracle internal exchange of data, you can run until the