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Easy-to-use database-agnostic SQL frontend

Project description

This module implements some nice common features for database access:

  • Common parameters for database setup (no more “db” vs. “database” when you switch back-ends)

  • Single-line SQL statements and single-row SELECTs:

    >>> db.Do("insert ...")
    >>> db.commit()
    
    >>> try: foo,bar = db.DoFn("select ... where id=123")
    >>> except sqlmix.NoData: print "Could not find your stuff"
    >>> else: print "Foo is",foo,"and bar is",bar,"-- happy now?"
    
  • SELECT statements which can be used as iterators:

    >>> for a,b in db.DoSelect("select ..."):
    
    >>>     ...
    
  • … or you can get the result as a dict, or through a callback.

  • A common and clear syntax for placing values in SQL statements. (The Python DBI supports five incompatible ones.)

    >>> foo,bar = db.DoFn("select ... where id=${key}", key=whatever)
    

An adapter for the Twisted framework is included. It runs all queries in long-lived threads, with minimal overhead, packages the results in Deferred objects or simply uses a callback from the DB thread.

Sqlmix supports transactions, retrying them, and callback-on-final-success.

This module makes no attempt whatsoever to hide database-specific SQL syntax.

Project details


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