问题
I am trying to export some data using sqlplus and the Oracle spool functionality. The problem is that the SQL input file where I am defining my export is not letting me parameterize the table name from which I am exporting data -- it wants a literal :(
Calling sqlplus in a shell script:
sqlplus $USER/$PASSWD@$ORADB<<!
@export.sql $OUT_FILE $SOME_VAR $ENV
exit
!
export.sql:
set heading off
set head off
set term off
set tab off
set embedded on
set feedback off
set pagesize 0
set linesize 800
set trimspool on
set verify off
spool &1
SELECT '&2|' || some_col
FROM &3_TABLE
/
spool off
When $ENV is set to 'dev', I get
Enter value for 3_TABLE
whereas I want it to use dev_TABLE. When I unparameterize the table names in the sql file, the output runs fine. Also note that there is param &2, which is $SOME_VAR from the shell and it gets displayed evaluated fine. The only problem is in the FROM statement.
Is there any way to tell the sql input file to replace the parameterized table names before running SQL?
Thanks
回答1:
The problem is that SQL*Plus is treating the whole string after the &, up to the next whitespace or simlar, as the substitution variable name. Clearly that isn't what you want here.
Fortunately they've thought of this, and you can denote the end of the variable name with a .:
FROM &3._TABLE
(At least, that works for named variables, and I'm almost sure it will for positional ones... if not then you'd need to define a new variable set to &3 as a workaround).
It is in the documentation, but blink and you'll miss it:
If you wish to append characters immediately after a substitution variable, use a period to separate the variable from the character.
There's a related effect that you may want to bear in mind for the future. If the next character after the substitution variable is a . anyway - between the schema and table, or between table and column, for example - then that will be interpreted as the substitution terminator. Say you were passing the schema separately as &4, with value 'scott'; this:
FROM &4.&3._TABLE
looks reasonable but would be substituted as scottdev_TABLE, which won't be recognised. So in that instance you need to have an extra one:
FROM &4..&3._TABLE
which would be substituted as scott.dev_TABLE.
来源：https://stackoverflow.com/questions/13040679/parameterizing-table-name-in-sqlplus-input-file