Refactors DB access
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Fred Z
parent
564cf0a1e6
commit
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@ -13,9 +13,9 @@ This file is part of [ocp5](https://github.com/freezed/ocp5) project
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DB_CONFIG = {
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'host': 'localhost',
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'user': 'loff',
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'pass': 'loff',
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'password': 'loff',
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'db': 'loff',
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'char': 'utf8',
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'charset': 'utf8',
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'file': 'create-db-loff.sql'
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}
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130
db.py
130
db.py
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@ -21,99 +21,103 @@ class Db():
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>>> test = Db()
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>>> print(test.message)
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DB «loff» contains these tables :['category', 'product']
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DB size : 0.1 MB
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Table 'product' has «0» row(s)
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Table 'category' has «0» row(s)
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DB size : n.n MB
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Table 'product' has «n» row(s)
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Table 'category' has «n» row(s)
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"""
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def __init__(self):
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"""
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Class initialiser
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"""
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self.DB_NOT_FOUND = True
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self.MSG = {
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MSG_TEMPLATE = {
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"request": "-- REQUEST #{} : --{}",
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"database": "DB «{}» contains these tables :",
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"tables": "{}\n",
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"dashboard": "DB size : {dbsize}\nTable 'product' has «{rowprod}» "
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"row(s)\nTable 'category' has «{rowcat}» row(s)"
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}
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db_not_found = True
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self.message = ""
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self.result = list()
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# Connect to the database
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self.connection = pymysql.connect(
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host=DB_CONFIG['host'],
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user=DB_CONFIG['user'],
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password=DB_CONFIG['pass'],
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charset=DB_CONFIG['char'],
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cursorclass=pymysql.cursors.DictCursor)
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# MYSQL server connexion, without DB selection
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self.cnx()
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try:
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with self.connection.cursor() as cursor:
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# Show DB
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cursor.execute("SHOW DATABASES")
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db_list = cursor.fetchall()
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self.cursor.execute("SHOW DATABASES")
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db_list = self.cursor.fetchall()
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for idx, unused in enumerate(db_list):
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for idx, unused in enumerate(db_list):
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if DB_CONFIG['db'] in db_list[idx].values():
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self.DB_NOT_FOUND = False
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if DB_CONFIG['db'] in db_list[idx].values():
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db_not_found = False
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cursor.execute("USE {}".format(DB_CONFIG['db']))
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self.cursor.execute("USE {}".format(DB_CONFIG['db']))
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cursor.execute("SHOW TABLES")
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tbl_list = cursor.fetchall()
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self.cursor.execute("SHOW TABLES")
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tbl_list = self.cursor.fetchall()
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# Get size information on DB
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# TODO : extract DB & tables names from code
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cursor.execute("""
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SELECT table_schema "Full database",
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CONCAT(
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ROUND(
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SUM(data_length + index_length)
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/ 1024 / 1024, 1),
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" MB") "dbsize"
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FROM information_schema.tables
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WHERE table_schema = "loff"
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GROUP BY table_schema
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# Get size information on DB
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self.cursor.execute("""
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SELECT table_schema "Full database",
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CONCAT(
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ROUND(
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SUM(data_length + index_length)
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/ 1024 / 1024, 1),
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" MB") "dbsize"
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FROM information_schema.tables
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WHERE table_schema = "loff"
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GROUP BY table_schema
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UNION
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UNION
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SELECT "Rows in 'product' table", COUNT(*)
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FROM product
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SELECT "Rows in 'product' table", COUNT(*)
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FROM product
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UNION
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UNION
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SELECT "Rows in 'category' table", COUNT(*)
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FROM category;
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""")
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dashboard = cursor.fetchall()
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SELECT "Rows in 'category' table", COUNT(*)
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FROM category;
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""")
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dashboard = self.cursor.fetchall()
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# Constructs DB information message
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self.message = self.MSG['database'].format(
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dashboard[0]['Full database'])
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# Constructs DB information message
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self.message = MSG_TEMPLATE['database'].format(
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dashboard[0]['Full database'])
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self.message += self.MSG['tables'].format(
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[val['Tables_in_loff'] for val in tbl_list])
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self.message += MSG_TEMPLATE['tables'].format(
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[val['Tables_in_loff'] for val in tbl_list])
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self.message += self.MSG['dashboard'].format(
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dbsize=dashboard[0]['dbsize'].decode("utf-8"),
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rowprod=dashboard[1]['dbsize'].decode("utf-8"),
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rowcat=dashboard[2]['dbsize'].decode("utf-8"))
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self.message += MSG_TEMPLATE['dashboard'].format(
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dbsize=dashboard[0]['dbsize'].decode("utf-8"),
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rowprod=dashboard[1]['dbsize'].decode("utf-8"),
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rowcat=dashboard[2]['dbsize'].decode("utf-8"))
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# No DB, create it
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if self.DB_NOT_FOUND:
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request_list = self.get_sql_from_file()
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# No DB, create it
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if db_not_found:
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request_list = self.get_sql_from_file()
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if request_list is not False:
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if request_list is not False:
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for idx, sql_request in enumerate(request_list):
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self.message = self.MSG['request'].format(
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idx, sql_request)
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cursor.execute(sql_request + ';')
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for idx, sql_request in enumerate(request_list):
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self.message = MSG_TEMPLATE['request'].format(
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idx, sql_request)
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self.cursor.execute(sql_request + ';')
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except pymysql.err.OperationalError as except_detail:
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print("DB error: «{}»".format(except_detail))
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def cnx(self, with_db=False):
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""" Connect to DB """
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conf = {
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'host': DB_CONFIG['host'],
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'user': DB_CONFIG['user'],
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'password': DB_CONFIG['password'],
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'charset': DB_CONFIG['charset'],
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'cursorclass': pymysql.cursors.DictCursor
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}
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if with_db:
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conf['db'] = DB_CONFIG['db']
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self.cursor = pymysql.connect(**conf).cursor()
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def get_sql_from_file(self, filename=DB_CONFIG['file']):
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"""
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@ -144,7 +148,7 @@ class Db():
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def __del__(self):
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""" Object destruction"""
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self.connection.close()
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self.cursor.close()
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if __name__ == "__main__":
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