Category Archives: PostgreSQL
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The development version of the Trip Planner uses a Postgres/PostGIS backend (instead of MySQL) SQLAlchemy Buy cialis without prescription, as the ORM (instead of raw SQL), and PCL for Python geometry types (instead of our own ugly hacked versions).
Question: How do you move geometries out of Postgres/PostGIS into PCL types via SQLAlchemy and vice versa, Osta cialis. Buy cheap cialis online, Answer: Create a custom geometry column type.
Here's our SQLAlchemy geometry type definition and subtypes (points, buy cialis, New Hampshire NH N.H. , linestrings, and multilinestrings; adding other types should be trivial):
Look here for an example of using it:
The type is pretty simple, California CA Calif. . αγοράζουν online cialis, The only tricky part was figuring out how the database stores the geometry. It's in ASCII hex, cialis online stores, Buy cialis pills, so we use binascii.a2b_hex to get a binary representation and feed that to the PCL fromWKB factory. In the other direction we use binascii.b2a_hex on the WKB representation of the PCL geometry, αγοράσετε cialis. Billig kaufen cialis, [8/7/09: Updated links to source code. Note: latest version uses Shapely, order cialis, Cheap cialis no prescription, not PCL.]. Buy cialis without prescription. Vermont VT Vt. . Comprar cialis baratos. Order cialis online without prescription. Minnesota MN Minn. . Farmacia cialis baratos. Ordering cialis overnight delivery. West Virginia WV W.Va. . Buy cialis online legally. Cialis pedido en línea. Purchase cialis. Ordering cialis from canada. Connecticut CT Conn. .
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Order levitra online cheap, So let's say you need a spatial geometry library for Python. Levitra over the counter, You could write your own; you could also use the PCL. The PCL includes some packages we don't need, levitra, Buy levitra no rx, like one for MapServer rendering. I only installed the minimum needed to get the spatial package working (which I'll talk about below), levitra sale. Order levitra overnight delivery, [Note: "geometry" refers to points, lines, Rhode Island RI R.I. , Køb billige levitra, polygons and other geometric forms used to represent real-world objects. Examples: intersection (point), street (line), zip code boundary (polygon).]
I wrote a rudimentary geometry library for the trip planner that's been working fine, but now I need to do some more "advanced" stuff related to using PostGIS and SQLAlchemy, order levitra online cheap. In particular, Nebraska NE Nebr. , Cheap generic levitra, I want to convert database values to Python objects and vice versa.
The first part (database to Python) is fairly easy and our current library already does that, kjøpe billig levitra, Arkansas AR Ark. , but it's convoluted in that it gets the database value as well-known text (WKT), parses that, billig kaufen levitra, Order levitra without prescription, and creates a Python object. From what I can tell, levitra pharmacy, Pennsylvania PA Penn. , the PCL can go straight from well-known binary (WKB) geometry to Python objects.
The second part (Python to database) is harder because it involves converting a Python object to a binary geometry value, generic levitra. Order levitra online cheap, I don't know anything about the binary geometry format and I don't want to know, and it looks like with the PCL I don't need to know. Buy levitra online legally, I'm assuming PostGIS and PCL will get along together because they both rely on the same libraries, proj4 and geos, buy levitra. Buy levitra cod, We'll see.
The installation was fairly straightforward, levitra online kopen. Wyoming WY Wyo. , The PCL includes five sub-packages. We had to install two of them, PCL-Referencing and PCL-Spatial, order levitra online cheap. PCL-Referencing requires proj4, farmacia levitra baratos. Buy cheap levitra, PCL-Spatial requires PCL-Referencing and geos >= 2.2.2. Something in there also requires the OGR library, New Mexico NM N.Mex. , Kopen goedkope levitra, which is included with GDAL.
The basic steps are, install proj, geos, and gdal, then install PCL-Referencing, and lastly install PCL-Spatial. On Ubuntu 6.06 (Dapper), here's what I actually did:
- Installed proj4 using apt-get
- Installed libgdal using apt-get
- Installed geos 2.2.3 from source into /usr/lib. I installed this over a slightly older version of geos installed using apt-get; hopefully that won't cause any issues.
- Checked out the PCL trunk:
svn co http://svn.gispython.org/gispy/PCL/trunk PCL - Installed PCL-Referencing with the usual
python setup.py install - Installed PCL-Spatial with the usual...
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Order levitra without prescription, I just tried out some o' that new-fangle "Test Driven Development" (TDD) I've been hearing about. Levitra over the counter, Yeah, it's good stuff, levitra pharmacy. Acheter levitra discount, At the moment, I'm in the process of migrating GIS data from MySQL to PostgreSQL so we can take advantage of the PostGIS spatial extensions, Osta levitra online. Delaware DE Del. , I've also been making a bunch of related changes (AKA refactoring) in the "model", separating things that never belonged together, levitra prescription, South Dakota SD , and so forth.
I started out by rewriting the MySQL data import script, where to buy cheap levitra. [Note: basically, the script pulls data out of a flat ESRI shapefile and normalizes it.] This wasn't a complete, from-scratch rewrite--a lot of stuff I just copied over and tweaked a little bit, order levitra without prescription. New Mexico NM N.Mex. , The biggest changes here were due to using SQLAlchemy instead of typing out SQL queries. I'll just note that SQLAlchemy is "da bomb" and makes many things easier (once you get the hang of it), order levitra overnight delivery. Kopen goedkope levitra, That part was pretty straightforward, and low-level--I didn't get into the ORM aspects of SQLAlchemy at all, New Hampshire NH N.H. . Cheap levitra without prescription, The next step was to modify the routine that creates adjacency matrices for routing. Order levitra without prescription, In the end, this was straightforward too. I ended up reusing some stuff from the new import script, levitra no prescription, Buy cheap levitra online, which was cool. I refactored a lot during this process, buy levitra no prescription, Order levitra no prescription, adding some new modules and classes.
[Here's where we get to the TDD aspect.]
So, Washington WA Wash. , Købe levitra, I was sitting there (here really) thinking, "Hmmm.., discount levitra. Cheap levitra pills, what now?" I drew some diagrams with the new classes and associations.... OK, that's fun..., order levitra without prescription. "Wait, Virginia VA Va. , Buy cheap levitra, I know. Run the unit tests!" Doy, order levitra online cheap. φτηνές φαρμακείο levitra, I started with the address normalization service, since the other services both depend on it. The test suite for this service isn't as comprehensive as it probably should be (there are 19 tests), but it proved to very useful for shaking out a bunch of bugs in all that refactoring. The tests also helped keep me focused, and that aspect might be more important than the bug-squashing aspect (maybe).
Today, address normalization. Tomorrow, geocoding.
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