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annotate lemuriformes/url2sql.py @ 17:4793f99b73e0

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[lemuriformes] utility functions
author Jeff Hammel <k0scist@gmail.com>
date Sun, 10 Dec 2017 17:42:52 -0800
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1 """
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2 instantiate a SQL interface from a URL
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3 """
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4
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5 from urlparse import urlparse
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6
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7 # Local imports of types; messy, currently
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8 from .db import MySQLConnection
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9 from .cli import ConfigurationParser
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10 from .csv2sqlite import SQLiteConnection
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11
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12 sql_types = {'mysql': MySQLConnection,
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13 'sqlite': SQLiteConnection
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14 }
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15
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16 ports = {'mysql': 3306,
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17 }
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18
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19
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20 def url2sql(url):
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21 """instantiate SQL connection based on URL"""
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22
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23 # parse URL
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24 parsed = urlparse(url)
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25
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26 if parsed.scheme not in sql_types:
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27 raise AssertionError("Unsupported SQL connector type: '{}'".format(parsed.scheme))
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28
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29 default_port = ports.get(parsed.scheme)
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30
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31 # instantiate MySQL connection
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32 if parsed.scheme == 'mysql':
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33 conn_data = dict(host=parsed.hostname,
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34 user=parsed.username,
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35 password=parsed.password,
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36 port=parsed.port or default_port,
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37 db=parsed.path.strip('/'))
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38 elif parsed.scheme == 'sqlite':
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39 conn_data = dict(db_file=parsed.path)
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40 return sql_types[parsed.scheme](**conn_data)