author | David Anderson <david.jc.anderson@gmail.com> |
Fri, 13 Mar 2009 02:13:21 +0000 | |
changeset 1825 | a610a2df83d2 |
parent 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
323
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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1 |
from types import UnicodeType |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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2 |
|
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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3 |
def gqn(val): |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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4 |
""" |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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5 |
The geographic quote name function; used for quoting tables and |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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6 |
geometries (they use single rather than the double quotes of the |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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7 |
backend quotename function). |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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8 |
""" |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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9 |
if isinstance(val, basestring): |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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10 |
if isinstance(val, UnicodeType): val = val.encode('ascii') |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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11 |
return "'%s'" % val |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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12 |
else: |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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13 |
return str(val) |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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14 |
|
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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15 |
class SpatialOperation(object): |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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16 |
""" |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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17 |
Base class for generating spatial SQL. |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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18 |
""" |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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19 |
def __init__(self, function='', operator='', result='', beg_subst='', end_subst=''): |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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20 |
self.function = function |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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21 |
self.operator = operator |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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22 |
self.result = result |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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23 |
self.beg_subst = beg_subst |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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24 |
try: |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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25 |
# Try and put the operator and result into to the |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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26 |
# end substitution. |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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27 |
self.end_subst = end_subst % (operator, result) |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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28 |
except TypeError: |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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29 |
self.end_subst = end_subst |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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30 |
|
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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31 |
@property |
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parents:
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32 |
def sql_subst(self): |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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33 |
return ''.join([self.beg_subst, self.end_subst]) |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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34 |
|
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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35 |
def as_sql(self, geo_col): |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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36 |
return self.sql_subst % self.params(geo_col) |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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37 |
|
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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38 |
def params(self, geo_col): |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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39 |
return (geo_col, self.operator) |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
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40 |
|
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
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41 |
class SpatialFunction(SpatialOperation): |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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42 |
""" |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
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43 |
Base class for generating spatial SQL related to a function. |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
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44 |
""" |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
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45 |
def __init__(self, func, beg_subst='%s(%s, %%s', end_subst=')', result='', operator=''): |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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46 |
# Getting the function prefix. |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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47 |
kwargs = {'function' : func, 'operator' : operator, 'result' : result, |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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48 |
'beg_subst' : beg_subst, 'end_subst' : end_subst,} |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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49 |
super(SpatialFunction, self).__init__(**kwargs) |
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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50 |
|
ff1a9aa48cfd
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
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51 |
def params(self, geo_col): |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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52 |
return (self.function, geo_col) |