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preprocesses SQL queries to make them modular

Project description

# querypp

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querypp preprocesses SQL queries[1] in order to “parameterize” them. 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 -- :param profiles LEFT JOIN profiles USING (user_id) -- :param login_history LEFT JOIN login_history USING (profile_id) -- :endparam -- :endparam -- :param user_id WHERE user_id = $1 `

A Query object can be called:
  • with no parameters to return the entire query
  • with one or more parameters to return the query with only those parameters.

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 some of them were being duplicated except for one extra clause. I created this to allow me to deduplicate such queries.

## License

Public domain, see [COPYING](/COPYING)

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