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[Orgmode] Re: [Babel] How to pass variables to SQL blocks?
From: |
Sébastien Vauban |
Subject: |
[Orgmode] Re: [Babel] How to pass variables to SQL blocks? |
Date: |
Wed, 01 Dec 2010 11:35:31 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/23.1.50 (windows-nt) |
Hi Eric,
"Eric Schulte" wrote:
> Sébastien Vauban <address@hidden> writes:
>
> Babel's sql support did not have any variable handling. I just copied over
> the variable support from ob-sqlite to ob-sql, so the following should now
> work (notice: my code block is different from yours)
>
> ** sql variables
> #+results: sql-param
> | table | valueTable0 |
> | column | valueColumn0 |
> | type | valueType0 |
> | nullability | valueNullability0 |
>
> I want to apply the values onto the following chunk of code:
>
> #+srcname: add-column-in-table-0
> #+begin_src sql :var table=sql-param[0,1] :var column=sql-param[1,1] :var
> type=sql-param[2,1] :var nullability=sql-param[3,1]
> -- add column address@hidden' (if column does not exist yet)
> IF NOT EXISTS (SELECT *
> FROM INFORMATION_SCHEMA.COLUMNS
> WHERE TABLE_NAME = '@table'
> AND COLUMN_NAME = '@column')
> BEGIN
> ALTER TABLE $table
> ADD $column $type @nullability
> END
> #+end_src
>
> results in the following code block expansion (C-c C-v v)
> #+begin_src sql
> -- add column address@hidden' (if column does not exist yet)
> IF NOT EXISTS (SELECT *
> FROM INFORMATION_SCHEMA.COLUMNS
> WHERE TABLE_NAME = '@table'
> AND COLUMN_NAME = '@column')
> BEGIN
> ALTER TABLE valueTable0
> ADD valueColumn0 valueType0 @nullability
> END
> #+end_src
For your information, this was the intended code snippet:
#+srcname: add-column-in-table-0
#+begin_src sql :var table=sql-param[0,1] :var column=sql-param[1,1] :var
type=sql-param[2,1] :var nullability=sql-param[3,1] :tangle yes
-- add column `$column' (if column does not exist yet)
IF NOT EXISTS (SELECT *
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME = '$table'
AND COLUMN_NAME = '$column')
BEGIN
ALTER TABLE $table
ADD $column $type $nullability
END
#+end_src
(I thought this feature would be implemented using "real" SQL vars, hence my @
prefix. But viewing the code shows the replacement is made outside of the SQL
snippet's knowledge.)
Tested. Works as expected... Thanks a lot!
Maybe the following should be put on some TODO list, even if not urgent?
>> * No warning if block does not exist
>>
>> Please note that inexistent references are ignored, without further notice.
>> That's the case for such a block (where I forgot the number suffix):
>>
>> #+srcname: contains-inexistent-ref
>> #+begin_src sql :noweb yes
>> <<add-column-in-table>>
>> #+end_src
Thanks.
Best regards,
Seb
--
Sébastien Vauban
- [Orgmode] Re: [Babel] How to pass variables to SQL blocks?,
Sébastien Vauban <=