需要Oracle sqlldr TRAILING NULLCOLS,但是为什么呢? [英] Oracle sqlldr TRAILING NULLCOLS required, but why?
问题描述
我遇到一个麻烦的sqlldr问题.我的控制文件如下所示:
I have an abstruse sqlldr problem that's bothering me. My control file looks something like this:
load data
infile 'txgen.dat'
into table TRANSACTION_NEW
fields terminated by "," optionally enclosed by '"'
TRAILING NULLCOLS
( A,
B,
C,
D,
ID "ID_SEQ.NEXTVAL"
)
数据是这样的:
a,b,c,
a,b,,d
a,b,,
a,b,c,d
如果不放入TRAILING NULLCOLS,则会收到逻辑记录结束前未找到列"的错误.但是,尽管有些列为空,但逗号全在那儿,所以我看不到sqlldr会误解输入文件的原因,并且不会一直到它从数据库序列生成ID的末尾.
If I don't put the TRAILING NULLCOLS in, I get the "column not found before end of logical record" error. But although some of the columns are null, the commas are all there, so I don't see a reason for sqlldr to misinterpret the input file, and not get to the end where it generates the ID from the database sequence.
此语法以前没有空列就可以使用-为什么空列会导致sqlldr无法到达生成的列?
This syntax has worked before with no null columns - why does a null column cause sqlldr to not reach the generated column?
我已经开始工作了,我只想了解为什么!?!
I've got it working, I just want to understand WHY!?!
推荐答案
您已在控制文件中定义了5个字段.您的字段以逗号结尾,因此,即使您通过SQL字符串使用序列值加载ID字段,除非指定了TRAILING NULLCOLS,否则对于5个字段,每条记录都需要5个逗号.
You have defined 5 fields in your control file. Your fields are terminated by a comma, so you need 5 commas in each record for the 5 fields unless TRAILING NULLCOLS is specified, even though you are loading the ID field with a sequence value via the SQL String.
RE:OP的评论
这不是我进行简短测试的经验.带有以下控制文件:
That's not my experience with a brief test. With the following control file:
load data
infile *
into table T_new
fields terminated by "," optionally enclosed by '"'
( A,
B,
C,
D,
ID "ID_SEQ.NEXTVAL"
)
BEGINDATA
1,1,,,
2,2,2,,
3,3,3,3,
4,4,4,4,,
,,,,,
产生以下输出:
Table T_NEW, loaded from every logical record.
Insert option in effect for this table: INSERT
Column Name Position Len Term Encl Datatype
------------------------------ ---------- ----- ---- ---- ---------------------
A FIRST * , O(") CHARACTER
B NEXT * , O(") CHARACTER
C NEXT * , O(") CHARACTER
D NEXT * , O(") CHARACTER
ID NEXT * , O(") CHARACTER
SQL string for column : "ID_SEQ.NEXTVAL"
Record 1: Rejected - Error on table T_NEW, column ID.
Column not found before end of logical record (use TRAILING NULLCOLS)
Record 2: Rejected - Error on table T_NEW, column ID.
Column not found before end of logical record (use TRAILING NULLCOLS)
Record 3: Rejected - Error on table T_NEW, column ID.
Column not found before end of logical record (use TRAILING NULLCOLS)
Record 5: Discarded - all columns null.
Table T_NEW:
1 Row successfully loaded.
3 Rows not loaded due to data errors.
0 Rows not loaded because all WHEN clauses were failed.
1 Row not loaded because all fields were null.
请注意,正确加载的唯一行有5个逗号.即使是第三行,除了ID以外,所有数据值都存在,数据也不会加载.除非我想念什么...
Note that the only row that loaded correctly had 5 commas. Even the 3rd row, with all data values present except ID, the data does not load. Unless I'm missing something...
我正在使用10gR2.
I'm using 10gR2.
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