Oracle UTL_FILE 用法例子

General Information
Note: O/S permissions are those of the user 'Oracle' ... not the schema owner or connected user
Source	{ORACLE_HOME}/rdbms/admin/utlfile.sql
First Availability	7.3.4

init.ora Parameters

utl_file_dir

utl_file_dir=c:\oraload
utl_file_dir=c:\temp
utl_file_dir=*

Open Modes

A	Append Text
AB	Append Byte Mode
R	Read Text
RB	Read Byte Mode
W	Write Text
WB	Write Byte Mode

FCLOSE
Close A File Opened By UTL_FILE	utl_file.fclose(<file_handle>)
see FOPEN demo
FCLOSE_ALL
Close All Files Opened By UTL_FILE	utl_file.fclose_all;
set serveroutput on DECLARE vInHandle utl_file.file_type ; vOutHandle utl_file.file_type ; BEGIN vInHandle := utl_file.fopen ('ORALOAD', 'test.txt', 'R'); vOutHandle := utl_file.fopen ('ORALOAD', 'out.txt', 'W'); IF utl_file.is_open (vInHandle) THEN utl_file.fclose_all ; dbms_output.put_line('Closed All'); END IF; END fopen; /
FCOPY
Copies a contiguous portion of a file to a newly created file	utl_file.fcopy ( location IN VARCHAR2, filename IN VARCHAR2, dest_dir IN VARCHAR2, dest_file IN VARCHAR2, start_line IN PLS_INTEGER DEFAULT 1, end_line IN PLS_INTEGER DEFAULT NULL);
-- demo requires creating directory CTEMP ... see link at bottom of page BEGIN utl_file.fcopy ('ORALOAD', 'dump.txt', 'ORALOAD', 'didit.txt'); END; /
FFLUSH
Physically writes pending data to the file identified by the file handle	utl_file.fflush (<file_handle>);
See Write demo
FGETATTR
Reads and returns the attributes of a disk file	utl_file.fgetattr( location IN VARCHAR2, filename IN VARCHAR2, exists OUT BOOLEAN, file_length OUT NUMBER, blocksize OUT NUMBER);
set serveroutput on DECLARE ex BOOLEAN; flen NUMBER; bsize NUMBER; BEGIN utl_file.fgetattr ('ORALOAD', 'test.txt', ex, flen, bsize); IF ex THEN dbms_output.put_line('File Exists'); ELSE dbms_output.put_line('File Does Not Exist'); END IF; dbms_output.put_line('File Length: ' || TO_CHAR(flen)); dbms_output.put_line('Block Size: ' || TO_CHAR(bsize)); END fgetattr; /
FGETPOS
Returns the current relative offset position within a file, in bytes	utl_file.fgetpos(fileid IN file_type) RETURN PLS_INTEGER;
See Read-Write demo
FOPEN
Open A File For Read Operations	utl_file.fopen( <file_location IN VARCHAR2>, <file_name IN VARCHAR2>, <open_mode IN VARCHAR2>, <max_linesize IN BINARY_INTEGER>) RETURN <file_type_package_data_type;
DECLARE vInHandle utl_file.file_type ; vNewLine VARCHAR2(250); BEGIN vInHandle := utl_file.fopen ('ORALOAD', 'test.txt', 'R'); LOOP BEGIN utl_file.get_line (vInHandle, vNewLine); dbms_output.put_line(vNewLine); EXCEPTION WHEN OTHERS THEN EXIT; END; END LOOP; utl_file.fclose (vInHandle); END fopen; /
Open A File For Write Operations	<file_handle> := utl_file.fopen(<file_location, file_name, 'w ')
FOPEN_NCHAR
Open a file to read or write a text file in Unicode instead of in the database charset
FREMOVE
Delete An Operating System File	utl_file.fremove (location IN VARCHAR2, filename IN VARCHAR2);
BEGIN utl_file.fremove ('ORALOAD', 'dump.txt'); END fremove; /
FRENAME
Rename An Operating System File	utl_file.frename ( location IN VARCHAR2, filename IN VARCHAR2, dest_dir IN VARCHAR2, dest_file IN VARCHAR2, overwrite IN BOOLEAN DEFAULT FALSE);
BEGIN utl_file.frename ('ORALOAD','test.txt','ORALOAD','x.txt',TRUE); END frename; /
FSEEK
Adjusts the file pointer forward or backward within the file by the number of bytes specified	utl_file.fseek ( fid IN utl_file.file_type, absolute_offset IN PL_INTEGER DEFAULT NULL, relative_offset IN PLS_INTEGER DEFAULT NULL);
See Read-Write demo
GETLINE
Read a Line from a file	utl_file.getline ( file IN FILE_TYPE, buffer OUT VARCHAR2, linesize IN NUMBER, len IN PLS_INTEGER DEFAULT NULL);
See Read demos
GETLINE_NCHAR
Same as GETLINE except can be used to read Unicode rather than the database's character set
GET_RAW
Reads a RAW string value from a file and adjusts the file pointer ahead by the number of bytes read	utl_file.get_raw ( fid IN utl_file.file_type, r OUT NOCOPY RAW, len IN PLS_INTEGER DEFAULT NULL);
See UTL_MAIL demo
IS_OPEN
Returns True If A File Handle Is Open: Otherwise False	utl_file.is_open (file IN FILE_TYPE) RETURN BOOLEAN;
See FCLOSE_ALL Demo
NEW_LINE
Writes one or more operating system-specific line terminators to a file	utl_file.NEW_LINE (file IN FILE_TYPE, lines IN NATURAL := 1);
See Read Demo
PUT
Writes a string to a file	utl_file.put( file IN FILE_TYPE, buffer IN VARCHAR2);
See Write demo
PUTF
A PUT procedure with formatting	utl_file.putf( file IN FILE_TYPE, format IN VARCHAR2, [arg1 IN VARCHAR2 DEFAULT NULL, . . . arg5 IN VARCHAR2 DEFAULT NULL]);
See Write demo
PUT_LINE
Writes a line to a file. Appends an operating system-specific line terminator	utl_file.put_line( file IN FILE_TYPE, buffer IN VARCHAR2, autoflush IN BOOLEAN DEFAULT FALSE);
See Read-Write demo
PUT_NCHAR
Writes a Unicode string to a file
PUT_RAW
Accepts as input a RAW data value and writes the value to the output buffer	utl_file.PUT_RAW ( fid IN utl_file.file_type, r IN RAW, autoflush IN BOOLEAN DEFAULT FALSE);
See extract_blob Demo
PUT_LINE_NCHAR
Writes a Unicode line to a file
PUTF_NCHAR
Writes a Unicode string to a file

本文转自:http://www.psoug.org/reference/utl_file.html