本来是练习三思的书里一个sqlldr的小示例，就是把excel文件另存为csv后通过sqlldr加载到Oracle数据库中。其目的本来是为了演示一下csv文件的sqlldr以及csv文件中的字符串中存在逗号, 和双引号”的处理方法，结果却引出了一个让我困惑了一阵子的问题，说大不大说小不小，反复测试了一番，怀疑到了一个点上，最后一查果然是那个样子，再测试就通过了，下面总结一下。
顺便记录一个：
三思说要创建scott这个经典的schema要运行$ORACLE_HOME/rdbms/admin/scott.sql这个脚本的内容，而实际上我并没找到这个脚本，找到并运行的是utlsampl.sql
excel是这样子的：
SMITH
CLEAK
3904
ALLEN
SALER,M
2891
WARD
SALER,"S"
3128
KING
PRESIDENT
2523
另存为'ldr_case2.csv'后内容是：
SMITH,CLEAK,3904
ALLEN,"SALER,M",2891
WARD,"SALER,""S""",3128
KING,PRESIDENT,2523
一切看起都挺正常的，然后将csv上传到Oracle所在的linux服务器上，写好control文件：
load data
infile 'ldr_case2.csv'
truncate into table bonus
fields terminated by ',' optionally enclosed by '"'
(ename,job,sal)
执行加载后日志显示为失败：
Table BONUS, loaded from every logical record.
Insert option in effect for this table: TRUNCATE
Column Name Position Len Term Encl Datatype
------------------------------ ---------- ----- ---- ---- ---------------------
ENAMEFIRST * , O(") CHARACTER
JOB NEXT * , O(") CHARACTER
SAL NEXT * , O(") CHARACTER
Record 1: Rejected - Error on table BONUS, column SAL.
ORA-01722: invalid number
Record 2: Rejected - Error on table BONUS, column SAL.
ORA-01722: invalid number
Record 3: Rejected - Error on table BONUS, column SAL.
ORA-01722: invalid number
Record 4: Rejected - Error on table BONUS, column SAL.
ORA-01722: invalid number
反复测试后，终于发现我把文件中的内容放到在linux下新建的文件中，加载OK，但是看起内容一样的csv怎么改都不行，我就怀疑看起来一样的东西是不是隐藏了什么不为我察觉的差异。带着这个疑问上网搜索了一下，果然有人遇到相同的问题，隐藏的差异就是csv文件行末藏了回车符。在linux下查看对比：
[oracle@nathan-rhel5 ~]$ cat -v ldr_case2.csv
SMITH,CLEAK,3904^M
ALLEN,"SALER,M",2891^M
WARD,"SALER,""S""",3128^M
KING,PRESIDENT,2523^M
[oracle@nathan-rhel5 ~]$ cat -v ldr_case2.dat0
SMITH,CLEAK,3904
ALLEN,"SALER,M",2891
WARD,"SALER,""S""",3128
KING,PRESIDENT,2523
原来作祟的就是文件行末的^M啊！！！
把csv文件转一下格式：
[oracle@nathan-rhel5 ~]$ dos2unix ldr_case2.csv
dos2unix: converting file ldr_case2.csv to UNIX format ...
[oracle@nathan-rhel5 ~]$ cat -v ldr_case2.csv
SMITH,CLEAK,3904
ALLEN,"SALER,M",2891
WARD,"SALER,""S""",3128
KING,PRESIDENT,2523
然后再重新加载一次数据成功了：
[oracle@nathan-rhel5 ~]$ vi ldr_case2.ctl
load data
infile 'ldr_case2.csv'
truncate into table bonus
fields terminated by ',' optionally enclosed by '"'
(ename,job,sal)
[oracle@nathan-rhel5 ~]$ sqlldr scott/tiger control=ldr_case2.ctl
SQL*Loader: Release 10.2.0.1.0 - Production on Sat Feb 22 22:47:31
Copyright (c) 1982, , Oracle. All rights reserved.
Commit point reached - logical record count 4
[oracle@nathan-rhel5 ~]$ vi ldr_case2.log
Control File: ldr_case2.ctl
Data File: ldr_case2.csv
Bad File: ldr_case2.bad
Discard File: none specified
(Allow all discards)
Number to load: ALL
Number to skip: 0
Errors allowed: 50
Bind array: 64 rows, maximum of 256000 bytes
Continuation: none specified
Path used: Conventional
Table BONUS, loaded from every logical record.
Insert option in effect for this table: TRUNCATE
Column Name Position Len Term Encl Datatype
------------------------------ ---------- ----- ---- ---- ---------------------
ENAMEFIRST * , O(") CHARACTER
JOB NEXT * , O(") CHARACTER
SAL NEXT * , O(") CHARACTER
Table BONUS:
4 Rows successfully loaded.
