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#!/usr/bin/env python3
# -*- coding : utf-8 -*-
# Python 3
import sqlite3
import os
import csv
import configparser
import sys
class SQLiteCsvConvert:
'''
This class takes a database file and extract into CSV files.
One table equal one csv file
'''
def __init__(self, SQLiteDBfileName, myDialect='excel'):
'''
Initialise SQLiteloader Class
:param SQLiteDBfileName:
:param myDialect:
:return:
'''
self.myDialect = myDialect
self.__registerDialect()
if not os.path.isfile(SQLiteDBfileName):
# Créer un fichier base de données
raise IOError('No database exists')
sys.exit()
self.connect = sqlite3.connect(SQLiteDBfileName)
self.cursor = self.connect.cursor()
self.cursor.execute('PRAGMA encoding="UTF-8";')
def __registerDialect(self):
'''
Add other dialects for CSV Writer.
'escaped', 'singlequote', 'excel-fr', 'unix-pwd'
By default CSV Writer have excel, excel-tabs, and unix dialects
:param:
:return:
'''
csv.register_dialect('escaped',
escapechar='\\',
doublequote=False,
quoting=csv.QUOTE_NONE)
csv.register_dialect('singlequote',
quotechar="'",
quoting=csv.QUOTE_ALL)
csv.register_dialect('excel-fr',
delimiter=';', quotechar='"', doublequote = 1,
escapechar=None, skipinitialspace = 0, quoting=csv.QUOTE_ALL,
lineterminator='\r\n')
csv.register_dialect('unix-pwd', delimiter=':',
quotechar=None, lineterminator='\r')
def executeRequest(self, statement):
'''
Use generator to request datas
:param statement:
:return: Generator
'''
try:
result = self.cursor.execute(statement)
for i in result:
yield i
except:
self.connect.rollback()
print("Erreur")
self.connect.commit()
def executeCommand(self, statement):
'''
Execute any SQL Command as CREATE/DROP/ALTER TABLE or DELETE... on
database and close connection
:param statement:
:return: None
'''
try:
self.cursor.execute(statement)
except:
self.connect.rollback()
print("Erreur")
self.connect.commit()
def extractDBtable(self):
'''
Extract all Table's name from database
:param:
:return:
'''
try:
statement = 'SELECT name FROM sqlite_master WHERE type="table";'
tableList = tuple()
for r in self.executeRequest(statement):
tableList += r
return tableList
except Exception as e:
raise e
def extractFields(self, tableName, detail=False):
'''
Extract fields in a selected table from database
:param tableName:
:param tableName:
:return fieldsList:
'''
statement = 'PRAGMA TABLE_INFO({})'.format(tableName)
fieldsList = []
r = self.executeRequest(statement)
for i in r:
if detail:
fieldsList += i
# Return all informations about fields (name, type, ...)
fieldsList.append(i[1:])
else:
# Return only the name of fields
fieldsList.append(i[1])
return fieldsList
def extractTabletoCSV(self, tableName, myFile):
'''
Extract one table from database to CSV file
:param tableName:
:param myFile:
:return:
'''
statement = 'SELECT * FROM %s' % (tableName)
#myTable = self.cursor.execute(statement)
try:
f = open(myFile, 'w', encoding="utf-8")
writer = csv.writer(f, self.myDialect)
temp = self.extractFields(tableName, detail=False)
writer.writerow(temp[1:])
for temp in self.executeRequest(statement):
writer.writerow(temp[1:])
f.close()
except FileExistsError:
print("Le fichier existe déjà")
def extractDBtoCSV(self):
'''
Extract all tables from database to CSV files
:return:
'''
extract = self.extractDBtable()
for table in extract:
self.extractTabletoCSV(table, str(table)+'.csv', self.myDialect)
def close(self):
self.connect.close()
print('Connection Closed') |
