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Oracle UTL_FILE 用法例子

2009-08-12 22:41 441 查看
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
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