简述数据库导入Oracle SQL*Loader指南

load data 
infile 'c:\data\mydata.csv' 
into table emp 
fields terminated by "," optionally enclosed by '"' 
      ( empno, empname, sal, deptno )

10001,"Scott Tiger", 1000, 40 
      10002,"Frank Naude", 500, 20

load data 
infile * 
replace 
into table departments 
( dept position (02:05) char(4), 
deptname position (08:27) char(20) 
) 
begindata 
COSC COMPUTER SCIENCE 
ENGL ENGLISH LITERATURE 
MATH MATHEMATICS 
      POLY POLITICAL SCIENCE

set echo off newpage 0 space 0 pagesize 0 
feed off head off trimspool on 
spool oradata.txt 
select col1  ','  col2  ','  col3 
from tab1 
where col2 = 'XYZ'; 
      spool off

rem Remember to update initSID.ora, 
utl_file_dir='c:\oradata' parameter 
declare 
fp utl_file.file_type; 
begin 
fp := utl_file.fopen('c:\oradata','tab1.txt','w'); 
utl_file.putf(fp, '%s, %s\n', 'TextField', 55); 
utl_file.fclose(fp); 
end; 
      /

LOAD DATA 
INFILE * 
INTO TABLE load_delimited_data 
FIELDS TERMINATED BY "," OPTIONALLY ENCLOSED BY '"' 
TRAILING NULLCOLS 
( data1, 
data2 
) 
BEGINDATA 
11111,AAAAAAAAAA 
22222,"A,B,C,D," 
下面是导入固定位置（固定长度）数据示例： 
LOAD DATA 
INFILE * 
INTO TABLE load_positional_data 
( data1 POSITION(1:5), 
data2 POSITION(6:15) 
) 
BEGINDATA 
11111AAAAAAAAAA 
      22222BBBBBBBBBB