Oracle SQL Loader中的映射字段 [英] Mapping fields in Oracle SQL Loader

问题描述

使用Oracle SQL Loader加载外部csv时，是否可以将控制文件中的字段直接相互映射?

When loading an external csv with Oracle SQL Loader is there a way to map the fields directly to each other in the control file?

目前，我正在执行简单的加载，因此源字段的位置很重要.是否有其他方法可以做到?因此，代替:

At the moment I'm doing a simple loading, so the position of the source fields is important. Is there a way to do it otherwise? So instead of:

load data
into table1
fields terminated by "," optionally enclosed by '"'
(destination_field1, destination_field2, destination_field3)

做类似的事情:

load data
into table1
fields terminated by "," optionally enclosed by '"'
(
source_field2 => destination_field1,
source_field1 => destination_field2,
source_field3 => destination_field3
)

主要原因是源文件中列的顺序可以更改，因此我不确定哪个字段将是第一个，第二个，等等.

The main reason is that the order of the columns in the source file can change, therefore I can't be sure which field will be the first, second, etc.

推荐答案

您可以在控制文件中包括通过Oracle函数进行的任何数据处理.
例如，此代码交换第1列和第2列，并另外将 source_field2 转换为数字，将错误的值静默替换为null:

You can include any data processing by means of Oracle functions in your control file.
E.g., this code swaps columns 1 and 2 and additionally converts source_field2 to number, silently replacing wrong values to nulls:

load data
append
into table SCHEMA.TABLE
fields terminated by ';' optionally enclosed by '"'
trailing nullcols
(
  source_field1     BOUNDFILLER,
  source_field2     BOUNDFILLER,
  source_field3     BOUNDFILLER,
  destination_field1 "to_number(regexp_substr(:source_field2, '^[-0-9,]*'),'9999999999D999','NLS_NUMERIC_CHARACTERS='', ''')",
  destination_field2 ":source_field1",
  destination_field3 ":source_field3"
)

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