关于ORACLE PLSQL读文件

转自：http://www.oracle.com/technology/obe/obe9ir2/obe-cnt/plsql/plsql.htm
都说读书不求甚解害死人，一点也不错，最近我从网上淘到关于ORACLE如何从数据库目录下读文件，于是就用于生产了，结果上了生产，程序死活就是跑不出来，原因是我们的服务器做了REC，如果在两台机器上找一个目录呢，以前呢在自己的程序里把路径写死了，在一般服务器上验证也没有问题，可是如果是双机呢？就不行了，那我们只好通过共享目录来实现，可是有了目录，程序还是找不到绝对路径，怎么办呢，看下面的程序，它都是在数据库里创建了一个DIRECTORY，修改成它，问题迎刃而解。
通过下面的例子，好好研究一下ORACLE提供给我们的功能吧！
Using New PL/SQL Features to Enhance Applications
Module Objectives
Purpose
This module describes how to utilize some of the latest PL/SQL capabilities to optimize performance and increase the efficiency of your PL/SQL applications..
Objectives
Upon completion of this module, you should be able to:
Use an Associative Array
Use the UTL_FILE package to manage access to directories, handle raw data, and copy, rename and delete files
Use Bulk binding in native dynamic SQL
Use PL/SQL RECORDs to access and manipulate changes to the database
Prerequisites
The prerequisites for this lesson are:
Completed the Preinstallation Tasks module
Completed the Installing the Oracle9i Database module
Download and unzip plsql.zip into your working directory
Reference Material
The following list represents some useful reference material should you need additional information on the topics in this module:
Documentation: PL/SQL User's Guide and Reference
Documentation: Supplied PL/SQL Packages and Types Reference
PL/SQL Whitepapers and Code Examples on OTN
Overview
The features you will explore in this lesson are:
1.
Using Associative Arrays
2.
Using the UTL_FILE Package
3.
Using Bulk Binding in Native Dynamic SQL
4.
Using PL/SQL Records
Using Associative Arrays
Back to List
In Oracle9i Database Release 2, PL/SQL index-by tables, now known as associative arrays, have been extended to allo