本篇文章详细介绍了如何在Oracle PL/SQL环境中实现FTP文件的上传与下载操作，为数据库管理员及开发人员提供了实用的技术指导。
Oracle P/L SQL 实现了 FTP 上传、下载功能。以下是此过程包的头部内容：
```sql
Create or Replace Package UTL_FTP AUTHID CURRENT_USER as
Type Connection is Record(
Connection UTL_TCP.Connection,
AccountInfo VarChar2(1000),
TransferMethod Char(1), -- A: ASCII, E: EBCDIC, I: IMAGE
TransferOption Char(1),
LocalDirectory VarChar2(30),
LastReply VarChar2(32767)
);
Type File_List is Table of VarChar2(32767) Index by Binary_Integer;
is_FTPStatus VarChar2(800) := disconnect;
is_FTPPort Constant Integer := 21;
is_TransferMethod Constant VarChar2(10) := ASCII;
ii_OutputLog Constant Integer := 1;
ii_RollBufferLog Constant Integer := 2;
ii_ClientInfoLog Constant Integer := 4;
-- Per RFC 959, if account info ( ACCT ) is requested Then a 332 code
-- should be Returned from the PASS command instead of a Positive Completion
ii_FTPRequestAcct Constant Integer := 332;
gb_Verbose Boolean := False; --是否记录冗长、累赘的日志
gi_LogOptions Integer := ii_OutputLog;
gs_LogText VarChar2(32767) := Null;
Procedure p_SetVerbose(ab_Verbose in Boolean);
Procedure p_SetLogOptions(ai_LogOptions in Integer);
Procedure p_ClearLog;
Function f_Login(as_RemoteHost in VarChar2, as_Username in VarChar2, as_Password in VarChar2,
as_LocalDirectory in VarChar2 Default Null,
as_RemoteDir in VarChar2 Default Null,
as_TransferMethod in VarChar2 Default is_TransferMethod,
ai_Timeout in Integer Default Null,
ai_FTPPort in Integer Default is_FTPPort,
as_AccountInfo in VarChar2 Default Null) Return Connection;
Procedure p_Logout(ac_Connection in out Nocopy Connection);
-- 更多过程和函数定义...
END UTL_FTP;
/
```
这个包提供了登录到远程FTP服务器、上传文件（包括CLOB/BLOB数据类型）、下载文件以及处理目录操作的功能，如创建或删除目录等。
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