外部 table 在从文件读取时截断尾随空格

External table truncates trailing whitespace while reading from file

我正在尝试将文件内容加载到外部 table。执行此操作时,尾随 space 会被截断。

'CREATE TABLE ' || rec.ext_table_name || ' (ROW_DATA VARCHAR2(4000)) ORGANIZATION EXTERNAL ' ||
     '(TYPE ORACLE_LOADER DEFAULT DIRECTORY ' || rec.dir_name || ' ACCESS ' || 'PARAMETERS (RECORDS ' ||
     'DELIMITED by NEWLINE NOBADFILE NODISCARDFILE ' ||
     'FIELDS REJECT ROWS WITH ALL NULL FIELDS (ROW_DATA POSITION(1:4000) char)) LOCATION (' || l_quote ||
     'temp.txt' || l_quote || ')) REJECT LIMIT UNLIMITED'

例如,B 表示空白 space,我的文件有:

Line1sometextBBBBBBB

我的外部 table 读取为:

Line1sometext

我也希望文件载入空白。我怎样才能阻止它删除尾随的白色space?

当前问题是:

如果文件有:

"this is a test value with

"

 ^   this new line is also a part of the row_data.

添加 a trim_spec clause,特别是在此处 NOTRIM,以更改默认字段修剪行为:

... FIELDS REJECT ROWS WITH ALL NULL FIELDS (ROW_DATA POSITION(1:4000) char NOTRIM)) LOCATION (...
                                                                            ^^^^^^

快速演示:

create table t42_ext (
  row_data varchar2(4000)
)
organization external
(
  type oracle_loader default directory mydir access parameters
  (
    records delimited by newline nobadfile nodiscardfile
    fields reject rows with all null fields
    (
      row_data position(1:4000) char notrim
    )
  )
  location ('temp.txt')
)
reject limit unlimited;

Table T42_EXT created.

select '<'|| row_data ||'>' from t42_ext;

'<'||ROW_DATA||'>'                                                             
--------------------------------------------------------------------------------
<Line1sometext       >