preprocesses SQL queries to make them modular
Project description
querypp
querypp preprocesses SQL queries[1] in order to allow conditional inclusion at runtime.
It also includes a loader which loads many queries from a file, delimited by -- :name query_name
lines.
[1] Although it is trivially adapted to other languages with line comments, as the only SQL-specific assumption is the comment syntax.
Take an example:
SELECT *
FROM users
-- :block profiles
LEFT JOIN profiles USING (user_id)
-- :block login_history
LEFT JOIN login_history USING (profile_id)
-- :endblock
-- :endblock
-- :block user_id WHERE user_id = $1
A Query object can be called:
- with no block names to return the entire query
- with one or more block names to return the query with only those block names.
In this case, q('profiles', 'user_id')
would return the query with the login_history
JOIN removed.
Motivation
After moving all my SQL queries to separate files (using the load_sql
function),
I noticed that I was duplicating some of them except for one extra clause.
I created this to allow me to deduplicate such queries.
License
Public domain, see COPYING
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