[PATCH] Add support for prologue and epilogue in SQL code blocks

[PATCH] Add support for prologue and epilogue in SQL code blocks

[Rodrigo Morales]

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I'm creating this patch because the prologue and epilogue header
arguments can be useful for SQL code blocks. For example, in PostgreSQL
:prologue can be used for setting the schema name where operations are
to be executed (see example below)

#+BEGIN_SRC org
* The foo schema
:PROPERTIES:
:HEADER-ARGS:SQL+: :engine postgres
:HEADER-ARGS:SQL+: :prologue "SET search_path = foo;"
:END:

The following code block shows the table in the =foo= schema.

,#+BEGIN_SRC sql
\dt;
,#+END_SRC

The following shows the tuples in the table =A=.

,#+BEGIN_SRC sql
SELECT * FROM A;
,#+END_SRC

The following shows the tuples in the table =B=.

,#+BEGIN_SRC sql
SELECT * FROM B;
,#+END_SRC
#+END_SRC

PS: This is the second time I'm creating a patch, so I would really
appreciate any feedback if I've done something wrong.


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From ed083bed92dcac258c9253cd34485c6cfe91eb6c Mon Sep 17 00:00:00 2001
From: Rodrigo Morales <rodrigo.morales@utec.edu.pe>
Date: Sat, 3 Jul 2021 01:53:44 -0500
Subject: [PATCH] lisp/ob-sql.el: Add support for :prologue and :epilogue

---
 lisp/ob-sql.el | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/lisp/ob-sql.el b/lisp/ob-sql.el
index 6eae5bb67..667bada31 100644
--- a/lisp/ob-sql.el
+++ b/lisp/ob-sql.el
@@ -93,8 +93,15 @@
 
 (defun org-babel-expand-body:sql (body params)
   "Expand BODY according to the values of PARAMS."
-  (org-babel-sql-expand-vars
-   body (org-babel--get-vars params)))
+  (let ((prologue (cdr (assq :prologue params)))
+	(epilogue (cdr (assq :epilogue params))))
+  (mapconcat 'identity
+             (list
+              prologue
+              (org-babel-sql-expand-vars
+               body (org-babel--get-vars params))
+              epilogue)
+             "\n")))
 
 (defun org-babel-edit-prep:sql (info)
   "Set `sql-product' in Org edit buffer.
-- 
2.32.0

Re: [PATCH] Add support for prologue and epilogue in SQL code blocks

[Rodrigo Morales]

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Apparently, A ">" character was accidentally inserted in the first line
of the patch. I'm attaching the patch again.



-- 
La información contenida en este e-mail y sus anexos es confidencial, 
privilegiada y está dirigida exclusivamente a su destinatario, en 
consecuencia, solo puede ser utilizada por aquel. Si usted no es el 
destinatario original, no deberá examinar, usar, copiar o distribuir este 
mensaje o la información que contiene. Si lo recibe por error, por favor 
reenvíelo a la persona que se lo envió y elimínelo. Cualquier retención o 
uso total o parcial no autorizada de este mensaje está estrictamente 
prohibida y sancionada por ley.

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #2: 0001-lisp-ob-sql.el-Add-support-for-prologue-and-epilogue.patch --]
[-- Type: text/x-patch, Size: 1030 bytes --]

From ed083bed92dcac258c9253cd34485c6cfe91eb6c Mon Sep 17 00:00:00 2001
From: Rodrigo Morales <rodrigo.morales@utec.edu.pe>
Date: Sat, 3 Jul 2021 01:53:44 -0500
Subject: [PATCH] lisp/ob-sql.el: Add support for :prologue and :epilogue

---
 lisp/ob-sql.el | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/lisp/ob-sql.el b/lisp/ob-sql.el
index 6eae5bb67..667bada31 100644
--- a/lisp/ob-sql.el
+++ b/lisp/ob-sql.el
@@ -93,8 +93,15 @@
 
 (defun org-babel-expand-body:sql (body params)
   "Expand BODY according to the values of PARAMS."
-  (org-babel-sql-expand-vars
-   body (org-babel--get-vars params)))
+  (let ((prologue (cdr (assq :prologue params)))
+	(epilogue (cdr (assq :epilogue params))))
+  (mapconcat 'identity
+             (list
+              prologue
+              (org-babel-sql-expand-vars
+               body (org-babel--get-vars params))
+              epilogue)
+             "\n")))
 
 (defun org-babel-edit-prep:sql (info)
   "Set `sql-product' in Org edit buffer.
-- 
2.32.0

Re: [PATCH] Add support for prologue and epilogue in SQL code blocks

[Bastien]

Hi Rodrigo,

Rodrigo Morales <rodrigo.morales@utec.edu.pe> writes:

> Apparently, A ">" character was accidentally inserted in the first line
> of the patch. I'm attaching the patch again.

Applied, thanks.

Would you like to become the maintainer for ob-sql.el?

It does not require you to actively contribute to it or to be the most
knowledgeable person on the matter, just that you can evaluate if a
change for this file is good.

If so, please fill in this form:
https://orgmode.org/request-assign-future.txt

Thanks!