[PYTHON] Use sqlite load_extensions with Pyramid

In SQLite, it is necessary to use an extension library to use mathematical functions and statistical functions, but it was a little devised to use it from Pyramid.

Introduction of expansion

Download extension-functions.c from the following URL.

https://www.sqlite.org/contrib Next, create a shared library.

gcc -fPIC -shared /home/takaki/Desktop/extension-functions.c -o libsqlitefunctions.so

If you can start sqlite and do the following, the extension library is OK.

$ sqlite3 
SQLite version 3.13.0 2016-05-18 10:57:30
Enter ".help" for usage hints.
Connected to a transient in-memory database.
Use ".open FILENAME" to reopen on a persistent database.
sqlite> select load_extension('./libsqlitefunctions.so');

sqlite> select sin(3.14/2);
0.999999682931835
sqlite>

Call from Pyramid

Make the following changes from the normal template file.

`model/init.py`


def get_session_factory(engine):
    @event.listens_for(engine, "connect")
    def connect(dbapi_connection, connection_rec):
        dbapi_connection.enable_load_extension(True)
        dbapi_connection.execute("SELECT load_extension('{0}');".format(FULL_PATH_OF_LIB))
    factory = sessionmaker()
    factory.configure(bind=engine)
    return factory

http://abrightersun.de/blog/spatialite-and-sqlalchemy.html
https://code.ffdn.org/FFDN/ffdn-db/src/master/ffdnispdb/init.py

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