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smartersql.py
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smartersql.py
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"""
smartersql: A smarter interface to SQL.
"""
import web
## lazy loading
def lazylookup(obj, column_name):
def inner(obj2):
# obj is obj2
# If we're being called, that means someone's trying to access
# a lazy reference on obj.
column = obj.columns[column_name]
objs = obj._objs
# First, we need to get the answer for all of us:
if isinstance(column, Backreference):
column.target = column._target()
local_column = column.local_column.sql_name
target_column = column.target_column
order = column.order
plural = column.plural
else:
local_column = column.sql_name
target_column = column.target_column.sql_name
order = None
plural = False
newobjs = {}
for k in column.target.select(
order=order,
where=web.sqlors(target_column + ' = ',
[getattr(x, local_column) for x in objs])):
val = getattr(k, target_column)
if plural:
newobjs.setdefault(val, []).append(k)
else:
newobjs[val] = k
# Then we need to add it to all of us:
for xobj in objs:
k = getattr(xobj, local_column)
if k in newobjs:
setattr(xobj.__class__, column_name, newobjs[k])
# Finally, we need to return it:
return newobjs.get(getattr(obj, local_column))
return inner
## table generation
_all_tables = []
class metatracker(type):
def __init__(self, name, bases, *a, **kw):
type.__init__(self, name, bases, *a, **kw)
if bases[0] != object:
_all_tables.append(self)
self.columns = self._analyze(init=True)
self.primary = self._primary(self.columns)
self.sql_name = self._sql_name_()
class Table(object):
__metaclass__ = metatracker
@classmethod
def _sql_name_(cls):
return cls.__name__.lower()
@classmethod
def _analyze(cls, init=False):
columns = web.Storage()
for k in dir(cls):
if isinstance(getattr(cls, k), Column):
v = getattr(cls, k)
v.sql_name = v._sql_name_(k)
if not hasattr(v, 'label'):
v.label = k.replace('_', ' ')
if init and hasattr(v, '_delayed_init'):
v._delayed_init(cls)
columns[k] = v
return columns
@staticmethod
def _primary(columns):
primary = web.Storage()
for k, v in columns.iteritems():
if v.primary:
primary[k] = v
return primary
@classmethod
def _createSQL(cls):
x = 'CREATE TABLE %s (\n' % cls.sql_name
for k, v in cls.columns.iteritems():
if not v.sql_type: continue # not for sql
x += ' %s %s' % (v.sql_name, v.sql_type)
if v.unique: x += ' UNIQUE'
if v.notnull: x += ' NOT NULL'
if v.default: x += ' DEFAULT %s' % x.default
x += ',\n'
if cls.primary:
x += ' PRIMARY KEY (%s)\n' % ', '.join(v.sql_name for v in cls.primary.itervalues())
else:
x = x[:-2] + '\n' # remove last comma
x += ')'
return x
@classmethod
def _dropSQL(cls, cascade=False):
cascade = " CASCADE" if cascade else ""
return 'DROP TABLE IF EXISTS %s%s' % (cls.sql_name, cascade)
@classmethod
def create(cls): cls.db.query(cls._createSQL())
@classmethod
def drop(cls, cascade=False): cls.db.query(cls._dropSQL(cascade))
@classmethod
def insert(cls, *a, **kw):
#@@ deal with seqname
#@@ convert objects to the proper identifiers
cls.db.insert(cls.sql_name, *a, **kw)
@classmethod
def select(cls, what='*', **kw):
rows = cls.db.select(cls.sql_name, what=what, **kw)
objs = [cls(x) for x in rows]
for o in objs:
#@@ make weakref?
o._objs = objs # so lazy references can fill in their neighbors
return objs
@classmethod
def where(cls, **clauses):
out = ""
for k, v in clauses.items():
out += k + '=' + web.sqlquote(v)
return cls.select(where=out)
def __init__(self, row, ids=None):
if ids: self._ids = ids
# divorce ourself from the parent class, so we can edit it
c = self.__class__
self.__class__ = type(c.__name__, c.__bases__, dict(c.__dict__))
for k, v in self.columns.iteritems():
if isinstance(v, Reference):
setattr(self.__class__, k, property(lazylookup(self, k)))
if v.sql_type:
setattr(self, v.sql_name, row[v.sql_name])
## columns
class Column(object):
def __init__(self, **kw):
for k in kw:
setattr(self, k, kw[k])
_sql_name_ = lambda self, k: k
default = None
primary = False
unique = False
notnull = False
display = lambda self, x: unicode(x)
toxml = lambda self, obj: '>' + web.htmlquote(unicode(obj))
class Reference (Column):
def __init__(self, target, **kw):
super(Reference, self).__init__(**kw)
assert len(target.primary) == 1, \
"Referenced column must have exactly 1 primary key."
self.target = target
self.target_column = target.primary.values()[0]
self.sql_type = self.target_column.sql_type + ' REFERENCES ' + target.sql_name
self._sql_name_ = lambda k: k + '_id'
def toxml(self, obj):
if hasattr(obj, '_uri_'):
return ' rdf:resource="%s">' % web.websafe(obj._uri_)
else:
return None
def ton3(self, obj, indent):
if hasattr(obj, '_uri_'):
return '<%s>' % obj._uri_
else:
return None
class Backreference (Reference):
def __init__(self, target, target_column, plural=True, order=None):
self._targetk = target
self.target_column = target_column + '_id'
self.plural = plural
self.order = order
self.sql_type = None
def _delayed_init(self, cls):
primary = cls._primary(cls._analyze())
assert len(primary) == 1, \
"Backreferences with composite primary keys isn't supported."
self.local_column = primary.values()[0]
def _target(self):
return [x for x in _all_tables if x.__name__ == self._targetk][0]
class String (Column):
sql_type = 'text'
def __init__(self, length=None, **kw):
super(String, self).__init__(**kw)
if length:
self.sql_type = 'varchar(%s)' % length
class Boolean(Column):
sql_type = 'bool'
display = lambda self, x: {True: 'Yes', False: 'No', None: 'Unknown'}
toxml = lambda self, obj: ' rdf:datatype="http://www.w3.org/2001/XMLSchema#boolean">%s' % web.websafe(obj).lower()
class Integer(Column):
sql_type = 'int'
toxml = lambda self, obj: ' rdf:datatype="http://www.w3.org/2001/XMLSchema#integer">%s' % web.websafe(obj)
class Float(Column):
sql_type = 'real'
toxml = lambda self, obj: ' rdf:datatype="http://www.w3.org/2001/XMLSchema#double">%s' % web.websafe(obj)
class Serial(Integer): sql_type = 'serial'
class Int2(Integer): sql_type = 'int2'
class Date(Column): sql_type = 'date'
class Year(Integer): pass
class Number(Integer):
display = lambda self, x: web.commify(x)
class Dollars(Integer):
display = lambda self, x: '$' + web.commify(x)
class Percentage(Float):
precision = 3
display = lambda self, x: str(x*100)[:self.precision + 1] + '%'
# add one for the decimal point
class URL(String):
toxml = lambda self, obj: ' rdf:resource="%s">' % web.websafe(obj)
ton3 = lambda self, obj, indent: '<%s>' % obj
## module functions
def create():
for table in _all_tables:
table.create()
def drop():
x = list(_all_tables)
x.reverse()
for table in x:
table.drop(cascade=True)
def recreate():
drop()
create()
def grantall(username):
for table in _all_tables:
try:
table.db.query('GRANT ALL ON %s TO %s' % (table.sql_name, username))
except:
pass