sqltemplate 0.5.4.post1

Core library for database querying tools based on templates

sqltemplate

Database query tool based on SQL templates

Development status

• Alpha
• API may be radically changed until first Beta release
• Not tested automatically yet

Roadmap

• 0.6 - drop django-sqltemplate compatibility layer
• 0.7 - automated tests, first beta release
• 0.8 - stable API
• 0.9,<1.0 - minor improvements without API changes, bugfixes
• 1.0 - first stable release

Introduction

SQL is a great and poweruful DSL, which is easeier in maintenance when you're working on complext queries (i.e. reporting queries). But the main problem of raw SQL is a commonly used "spaghetti" anti-pattern, when you're embedding/building SQLs directly in your code.

The solution comes from templating SQLs idea and sqltemplate is a simple implementation of it.

Template system / database agnostic

The sqltemplate provides an abstraction layer for templating SQL queries and working with query results. It requires an adapter to work.

For example - if you want to use sqltemplate together with Django templates and database management, use django-sqltemplate adapter directly.

Backward compatibilty with django-template

The 0.5.x branch contains a compatibility layer with django-template. The layer provides Django adapter and necessary imports.

Building an adapter

Adapter must implement few callables required by sqltemplate core. The adapter may be as a class instance or pure Python module providing such functions. These functions are defined as:

load_template(template_name)

Must load template by name and return some kind of template object, which will be passed to render_template() as an argument.

create_template_from_string(string)

Creates template object from provided string.

render_template(template, context)

Must render the template object using provided context (a dict).

do_query(sql, query_params, using=None)

Must execute a sql query with query_params applied.

Optional using argument specifies database connection identifier. This may be any object dependent on how your adapter recognizes particular connections. For Django adapter, for example, this is a string with a connection name.

Dependencies

• sqlparse
• flatdict

License

BSD