在oracle9i，如何在PL/SQL中读写文件

PL/SQL 3.3以上的版本中，UTL_FILE包答应用户通过PL/SQL读写操作系统文件。如下： declarefile_handle UTL_FILE.FILE_TYPE;beginfile_handle := UTL_FILE.FOPEN('TMP', '文件名', 'w',[1-32767]); ;--四个参数：目录，文件名，打开方式，最大行数(默认为2000)UTL_FILE.PUTF(file_handle, '写入的信息n');UTL_FILE.FCLOSE(file_handle);exceptionWHEN utl_file.invalid_path THENraise_application_error(-20000, 'ERROR: Invalid path for file or path not in INIT.ORA.');end; PutF()过程用来以指定格式把文本写入一个文件Put_Line()过程把一个指定的字符串写入文件并在文件中开始新的一行9i中函数说明：UTL_FILE.FOPEN ( location IN VARCHAR2, filename IN VARCHAR2, open_mode IN VARCHAR2, max_linesize IN BINARY_INTEGER) RETURN file_type; Parameters Description location (IN) The Directory location of the source file, a DIRECTORY_NAME from the; ALL_DIRECTORIES view (case sensitive) filename File name, including extension (file type), without directory path. In Unix,the filename cannot end with /. 一个使用文件的测试1、用sys用户登录到数据库(ora9i):conn sys/orcl@eai01 as sysdba2、在sqlplus中运行create or replace directory TMP as 'd:testtmp'; 在sqlplus中运行grant read on directory TMP to public3、在scott用户下建立存储过程如：pReadFileTestCREATE OR REPLACE PROCEDURE pReadFileTest; (FPATH IN STRING,FNAME IN STRING,MAX_NUM IN NUMBER) IS FILE_HANDLE UTL_FILE.FILE_TYPE; TEXT_BUFFER STRING(1000); LINE_NUM NUMBER;BEGIN DBMS_OUTPUT.PUT_LINE('INPUT PATH='FPATH); DBMS_OUTPUT.PUT_LINE('INPUT FILENAME='FNAME); LINE_NUM :=0; BEGIN FILE_HANDLE := UTL_FILE.FOPEN(FPATH,FNAME,'R',MAX_NUM); LOOP LINE_NUM:= LINE_NUM + 1; UTL_FILE.GET_LINE(FILE_HANDLE,TEXT_BUFFER); DBMS_OUTPUT.PUT_LINE('LINE'LINE_NUM' : 'TEXT_BUFFER); END LOOP; EXCEPTION WHEN NO_DATA_FOUND THEN RETURN; WHEN UTL_FILE.INVALID_PATH THEN DBMS_OUTPUT.PUT_LINE('INVALID PATH'); WHEN UTL_FILE.INVALID_MODE THEN DBMS_OUTPUT.PUT_LINE('INVALID MODE'); WHEN UTL_FILE.INVALID_FILEHANDLE THEN DBMS_OUTPUT.PUT_LINE('INVALID FILEHANDLE'); WHEN UTL_FILE.INVALID_OPERATION THEN DBMS_OUTPUT.PUT_LINE('INVALID OPERATION'); WHEN UTL_FILE.READ_ERROR THEN DBMS_OUTPUT.PUT_LINE('READ ERROR'); WHEN UTL_FILE.WRITE_ERROR THEN DBMS_OUTPUT.PUT_LINE('WRITE ERROR'); WHEN UTL_FILE.INTERNAL_ERROR THEN DBMS_OUTPUT.PUT_LINE('INTERNAL ERROR'); WHEN OTHERS THEN DBMS_OUTPUT.PUT_LINE(SQLERRM); END;EXCEPTIONWHEN OTHERS THENDBMS_OUTPUT.PUT_LINE('OTHER ERROR='SQLERRM);END pReadFileTest;4、在sqlplus中运行set serveroutput on5、exec pReadFileTest('TMP','A.TXT','R')6、正常输出小结：在9i中可以不在init.ora中增加utl_file_dir目录，而是在sys用户下创建一个directory目录（实际上是在sys用户下的dir$表中增加一个对应的OS_PATH），然后将对该directory对象的读/写操作的权限grant给public。