87 lines
2.7 KiB
Python
87 lines
2.7 KiB
Python
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###########################################################################
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# Copyright 2019 (C) Hui Lan <hui.lan@cantab.net>
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# Written permission must be obtained from the author for commercial uses.
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###########################################################################
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# Reference: Dusty Phillips. Python 3 Objected-oriented Programming Second Edition. Pages 326-328.
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# Copyright (C) 2019 Hui Lan
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import sqlite3
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class Sqlite3Template:
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def __init__(self, db_fname):
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self.db_fname = db_fname
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def connect(self, db_fname):
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self.conn = sqlite3.connect(self.db_fname)
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def instructions(self, query_statement):
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raise NotImplementedError()
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def operate(self):
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self.conn.row_factory = sqlite3.Row
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self.results = self.conn.execute(self.query) # self.query is to be given in the child classes
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self.conn.commit()
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def format_results(self):
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raise NotImplementedError()
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def do(self):
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self.connect(self.db_fname)
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self.instructions(self.query)
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self.operate()
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def instructions_with_parameters(self, query_statement, parameters):
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self.query = query_statement
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self.parameters = parameters
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def do_with_parameters(self):
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self.connect(self.db_fname)
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self.instructions_with_parameters(self.query, self.parameters)
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self.operate_with_parameters()
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def operate_with_parameters(self):
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self.conn.row_factory = sqlite3.Row
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self.results = self.conn.execute(self.query, self.parameters) # self.query is to be given in the child classes
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self.conn.commit()
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class InsertQuery(Sqlite3Template):
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def instructions(self, query):
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self.query = query
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class RecordQuery(Sqlite3Template):
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def instructions(self, query):
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self.query = query
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def format_results(self):
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output = []
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for row_dict in self.results.fetchall():
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lst = []
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for k in dict(row_dict):
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lst.append( row_dict[k] )
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output.append(', '.join(lst))
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return '\n\n'.join(output)
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def get_results(self):
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result = []
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for row_dict in self.results.fetchall():
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result.append( dict(row_dict) )
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return result
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if __name__ == '__main__':
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#iq = InsertQuery('RiskDB.db')
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#iq.instructions("INSERT INTO inspection Values ('FoodSupplies', 'RI2019051301', '2019-05-13', '{}')")
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#iq.do()
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#iq.instructions("INSERT INTO inspection Values ('CarSupplies', 'RI2019051302', '2019-05-13', '{[{\"risk_name\":\"elevator\"}]}')")
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#iq.do()
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rq = RecordQuery('wordfreqapp.db')
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rq.instructions("SELECT * FROM article WHERE level=3")
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rq.do()
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#print(rq.format_results())
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