#+TITLE: SQL layer

[[file:img/sql.png]]

* Table of Contents                                         :TOC_4_gh:noexport:
- [[#description][Description]]
- [[#install][Install]]
  - [[#sql-keywords-capitalization][SQL Keywords Capitalization]]
    - [[#sql-interactive-mode][SQL Interactive Mode]]
    - [[#blacklisting-keywords][Blacklisting keywords]]
- [[#key-bindings][Key bindings]]
  - [[#highlighting][Highlighting]]
  - [[#inferior-process-interactions-sqli][Inferior Process Interactions (SQLi)]]
    - [[#send-sql-queries-to-sqli][Send SQL queries to SQLi:]]
  - [[#sqli-buffer][SQLi buffer]]
  - [[#code-formating][Code Formating]]

* Description
This layer adds key bindings and configuration for =sql-mode=, which manages
interactive SQL buffers and highlights a wide range of SQL dialects.

* Install
To use this configuration layer, add it to your =~/.spacemacs=. You will need to
add =sql= to the existing =dotspacemacs-configuration-layers= list in this
file.

** SQL Keywords Capitalization
SQL, by convention, uses upper-case keywords, although lower-case works just as
well. As humans, the separation between upper-case and lower-case helps scan and
parse the code much more quickly.

To install [[https://github.com/Trevoke/sqlup-mode.el][sqlup-mode]] which enables auto capitalization in =sql mode= set the
variable =sql-capitalize-keywords= to =t=.

#+BEGIN_SRC emacs-lisp
  (setq-default dotspacemacs-configuration-layers '(
    (sql :variables sql-capitalize-keywords t)))
#+END_SRC

*** SQL Interactive Mode
If you want capitalization only in =sql-mode= and not in =sql-interactive-mode=
you can set the variable =sql-capitalize-keywords-disable-interactive= to =t=.

*** Blacklisting keywords
[[https://github.com/Trevoke/sqlup-mode.el][sqlup-mode]] can be configured to ignore certain keywords. For example if you use
=name= as column name it would be annoying to have it upcased. You can prevent
this behaviour by setting the variable =sql-capitalize-keywords-blacklist= to
string with one keyword (like ="name"=) or to list with multiple keywords (like
='("name" "varchar")=) to ignore.

This layer is blacklisting =name= by default as it is very common name for
column and NAME is non-reserved SQL keyword.

* Key bindings

** Highlighting

| Key Binding | Description                       |
|-------------+-----------------------------------|
| ~SPC m h k~ | select a SQL dialect to highlight |

** Inferior Process Interactions (SQLi)

| Key Binding | Description                 |
|-------------+-----------------------------|
| ~SPC m b b~ | show the SQLi buffer name   |
| ~SPC m b s~ | set the SQLi buffer         |
| ~SPC m l a~ | List all objects            |
| ~SPC m l t~ | list all objects in a table |

*** Send SQL queries to SQLi:

| Key Binding | Description                                                                           |
|-------------+---------------------------------------------------------------------------------------|
| ~SPC m s b~ | Send the whole buffer to the SQLi buffer                                              |
| ~SPC m s B~ | Send the whole buffer to the SQLi buffer and switch to it in =insert state=           |
| ~SPC m s i~ | Start the SQLi process                                                                |
| ~SPC m s f~ | Send the paragraph around point to the SQLi buffer                                    |
| ~SPC m s F~ | Send the paragraph around point to the SQLi buffer and switch to it in =insert state= |
| ~SPC m s q~ | Prompt for a string to send to the SQLi buffer                                        |
| ~SPC m s Q~ | Prompt for a string to send to the SQLi buffer and switch to it in =insert state=     |
| ~SPC m s r~ | Send the selected region to the SQLi buffer                                           |
| ~SPC m s R~ | Send the selected region to the SQLi buffer and switch to it in =insert state=        |

** SQLi buffer

| Key Binding | Description                                                  |
|-------------+--------------------------------------------------------------|
| ~SPC m b r~ | rename buffer (follow up in the SQL buffer with ~SPC m b s~) |
| ~SPC m b S~ | save the current connection                                  |

** Code Formating

| ~SPC m = c~ | capitalize SQL keywords in region (if capitalize is enabled) |