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annotate lemuriformes/table2csv.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 #!/usr/bin/env python
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2
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3 """
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4 dump a MySQL table to CSV
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5 """
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6
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7
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8 import argparse
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9 import csv
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10 import sys
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11 from .db import MySQLConnection, MySQLParser
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13
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14 class MySQLParser(argparse.ArgumentParser):
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15
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16 def __init__(self, **kwargs):
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17 argparse.ArgumentParser.__init__(self, **kwargs)
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18 self.add_arguments()
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19 self.options = None
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20
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21 def add_arguments(self):
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22 self.add_argument('host')
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23 self.add_argument('db')
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24 self.add_argument('-u', '--user', dest='user', default='root',
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25 help="MySQL user [DEFAULT: %(default)s]")
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26 self.add_argument('-p', '--password', dest='password',
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27 help="MySQL password [DEFAULT: %(default)s]")
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28
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29 def parse_args(self, args):
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30 options = argparse.ArgumentParser.parse_args(self, args)
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31 self.options = self.validate(options)
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32 return self.options
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33
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34 def validate(self, options):
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35 """validate options"""
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36 return options
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37
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38 def connection(self):
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39 if self.options is None:
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40 raise Exception("parse_args not called successfully!")
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41
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42 return MySQLConnection(host=self.options.host,
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43 user=self.options.user,
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44 password=self.options.password,
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45 db=self.options.db)
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46
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47 def main(args=sys.argv[1:]):
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48
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49 # parse command line
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50 parser = MySQLParser(description=__doc__)
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51 parser.add_argument('table',
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52 help="table to dump")
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53 parser.add_argument('-o', '--output', dest='output',
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54 type=argparse.FileType('w'), default=sys.stdout,
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55 help="path to put data to, or stdout by default")
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56 options = parser.parse_args(args)
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57
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58 # read table
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59 connection = parser.connection()
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60 data = connection("SELECT * FROM {table}".format(table=options.table))
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61
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62 # dump table
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63 writer = csv.writer(options.output)
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64 writer.writerows(data)
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65 options.output.flush()
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66
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67
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68 if __name__ == '__main__':
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69 main()