allow to shorten long strings in sql logs

[RonnyPfannschmidt]

when storing text blobs or larger sessions in the database,
the sql display gets pretty ugly due to a single string spanning so many lines

[andialbrecht]

FWIW, I've just added an option to sqlparse to truncate long string literals (see andialbrecht/sqlparse@204b779).

However, devserver still logs statements, that won't be parsed correctly by sqlparse to use this new option.

Here's for example a statement from the log (added some line breaks for readability):

UPDATE "django_session" SET "session_data" = OWExYWFiM2NjZDI0NTNlNDU3NDc0MTY2MTI3OTk3ODcyOWQ4NzY2ODqAAn1xAShVD2RqYW5nb19sYW5nd
WFnZVUCZGVVEl9hdXRoX3VzZXJfYmFja2VuZFUjZGxnaWNlcnQuYXV0aC5iYWNrZW5kcy5Nb2RlbEJhY2tlbm
RVDV9hdXRoX3VzZXJfaWRLFFUMb3JkZXJfc2VhcmNofXECKFUGc3RhdHVzSwFVBnJvd3NwcEsKdXUu, 
"expire_date" = 2013-07-09 09:45:58.538040
WHERE "django_session"."session_key" = 5du9r23h5sl2kvqdlhumxsm7nu4r0qpo;

Some quotes would be needed to make it valid SQL:

UPDATE "django_session" SET "session_data" = 'OWExYWFiM2NjZDI0NTNlNDU3NDc0MTY2MTI3OTk3ODcyOWQ4NzY2ODqAAn1xAShVD2RqYW5nb19sYW5n
dWFnZVUCZGVVEl9hdXRoX3VzZXJfYmFja2VuZFUjZGxnaWNlcnQuYXV0aC5iYWNrZW5kcy5Nb2RlbEJhY2tlbm
RVDV9hdXRoX3VzZXJfaWRLFFUMb3JkZXJfc2VhcmNofXECKFUGc3RhdHVzSwFVBnJvd3NwcEsKdXUu', 
"expire_date" = '2013-07-09 09:45:58.538040'
WHERE "django_session"."session_key" = '5du9r23h5sl2kvqdlhumxsm7nu4r0qpo';

With the corrected statement sqlparse would produce the following results:

>>> print(sqlparse.format(sql, reindent=True, truncate_strings=40))
UPDATE "django_session"
SET "session_data" = 'OWExYWFiM2NjZDI0NTNlNDU3NDc0MTY2MTI3OTk3[...]',
    "expire_date" = '2013-07-09 09:45:58.538040'
WHERE "django_session"."session_key" = '5du9r23h5sl2kvqdlhumxsm7nu4r0qpo';

Edit: Just noticed that this is related to #66

[RonnyPfannschmidt]

closing to get if off my plate on github