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Datum

Simple spatial ETL.

Installation

pip install git+https://github.com/CityOfPhiladelphia/datum

You'll also need to install dependencies for the drivers you're using. For example, to use PostGIS and Oracle ST_Geometry:

pip install git+https://github.com/CityOfPhiladelphia/datum .[postgis] .[oracle_stgeom]

Note: this step usually produces errors on Windows. Download .whl versions of these packages from this site and install them with pip install /path/to/some_package.whl.

Usage

import datum

db = datum.connect('oracle-stgeom://user:pass@tns_name')
table = db.table('table_name')
rows = table.read()

# read some rows from an oracle db
for row in rows:
    wkt = row['shape']
    print('The geometry for object {} is {}'.format(row['objectid'], wkt))

# write out to a local postgres db. the `write` function just needs a list of row dictionaries.
out_db = datum.connect('postgres://user:pass@localhost:5432/db_name')
out_table = out_db.table('table_name')
out_table.write(rows)

Installation

Setting up Oracle on OS X/Linux

Following this guide:

  1. Install the Oracle Instant Client. Download the 64-bit versions of the basic and sdk zip files from oracle.
  2. Create a global oracle directory in a location such as ~/.local/share/oracle and copy the two .zip files into it
  3. Unzip the .zip files into that directory. When finished, the oracle directory should contain a bunch of files in it (rather than containing a single directory of files).
  4. Inside the oracle directory, create symbolic links using:
ln -s libclntsh.dylib.11.1 libclntsh.dylib
ln -s libocci.dylib.11.1 libocci.dylib

Finally, add the following environment variables to your ~/.bash_profile, replacing the value of ORACLE_HOME with the absolute path to your new oracle directory.

export ORACLE_HOME="/path/to/oracle"
export DYLD_LIBRARY_PATH=$ORACLE_HOME
export LD_LIBRARY_PATH=$ORACLE_HOME

Note: Alternatively, you can install the Oracle Instant Client inside your virtual environment directory and set the environment variables contextually for the specific project.