简述数据库导入Oracle SQL*Loader指南

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

LOAD DATA 
INFILE * 
INTO TABLE load_positional_data 
SKIP 5 
( data1 POSITION(1:5), 
data2 POSITION(6:15) 
)
BEGINDATA 
11111AAAAAAAAAA 
      22222BBBBBBBBBB

LOAD DATA 
INFILE * 
INTO TABLE modified_data 
( rec_no "my_db_sequence.nextval", 
region CONSTANT '31', 
time_loaded "to_char(SYSDATE, 'HH24:MI')", 
data1 POSITION(1:5) ":data1/100", 
data2 POSITION(6:15) "upper(:data2)", 
data3 POSITION(16:22)"to_date(:data3, 'YYMMDD')" 
) 
BEGINDATA 
11111AAAAAAAAAA991201 
22222BBBBBBBBBB990112 
LOAD DATA 
INFILE 'mail_orders.txt' 
BADFILE 'bad_orders.txt' 
APPEND 
INTO TABLE mailing_list 
FIELDS TERMINATED BY "," 
( addr, 
city, 
state, 
zipcode, 
mailing_addr "decode(:mailing_addr, null, :addr, :mailing_addr)", 
mailing_city "decode(:mailing_city, null, :city, :mailing_city)", 
mailing_state 
      )