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from abc import ABC, abstractmethod
import MySQLdb
class Wrapper(ABC):
def __init__(self):
self.schemes = {}
@abstractmethod
def close_connection(self):
pass
@abstractmethod
def clear_table(self, table_name):
pass
@abstractmethod
def get_column_names(self):
pass
@abstractmethod
def insert_one(self, table_name, data_row: dict):
pass
@abstractmethod
def update(self, table_name, expressions, conditions):
pass
@abstractmethod
def delete_from(self, table_name, conditions):
pass
@abstractmethod
def get_data(self, table_name):
pass
@abstractmethod
def get_rows(self, table_name, conditions):
pass
class MySQLWrapper(Wrapper):
def __init__(self, host, username, password, db_name):
super().__init__()
self.connection = MySQLdb.connect(
host=host,
user=username,
password=password,
db=db_name
)
def close_connection(self):
self.connection.close()
def clear_table(self, table_name):
with self.connection.cursor() as cursor:
cursor.execute(f"DELETE FROM `{table_name}`;")
def get_column_names(self):
with self.connection.cursor() as cursor:
cursor.execute('DESCRIBE table_task1;')
table_structure = cursor.fetchall()
table_headers = [field[0] for field in table_structure]
return table_headers
def insert_one(self, table_name, data_row: dict):
scheme = self.schemes[table_name]
field_names = []
values = []
for field_name, value in data_row.items():
field_names.append(f'`{field_name}`')
if scheme.fields[field_name].nullable and value is None:
values.append('NULL')
elif scheme.fields[field_name].data_type == str:
values.append(f'"{value}"')
else:
values.append(str(value))
request = "INSERT INTO `{}` ({}) VALUES ({});".format(
table_name, ",".join(field_names), ",".join(values)
)
with self.connection.cursor() as cursor:
cursor.execute(request)
self.connection.commit()
def update(self, table_name, expressions, conditions):
expressions_formatted = []
for field_name, value in expressions.items():
if value != 'NULL' or not value.isnumeric():
value = f'"{value}"'
expressions_formatted.append(f'`{field_name}`={value}')
conditions_formatted = []
for field_name, value in conditions.items():
if value != 'NULL' or not value.isnumeric():
value = f'"{value}"'
conditions_formatted.append(f'`{field_name}`={value}')
with self.connection.cursor() as cursor:
cursor.execute("UPDATE `{}` SET {} WHERE {};".format(
table_name, ','.join(expressions_formatted), ' AND '.join(conditions_formatted)
))
self.connection.commit()
def delete_from(self, table_name, conditions):
conditions_formatted = []
for field_name, value in conditions.items():
if value != 'NULL' or not value.isnumeric():
value = f'"{value}"'
conditions_formatted.append(f'`{field_name}`={value}')
with self.connection.cursor() as cursor:
cursor.execute("DELETE FROM `{}` WHERE {};".format(
table_name, ' AND '.join(conditions_formatted)
))
self.connection.commit()
def get_data(self, table_name):
with self.connection.cursor() as cursor:
cursor.execute(f'SELECT * FROM `{table_name}`;')
content = list(map(list, cursor.fetchall()))
return content
def get_rows(self, table_name, conditions):
conditions_formatted = []
for field_name, value in conditions.items():
if value != 'NULL' or not value.isnumeric():
value = f'"{value}"'
conditions_formatted.append(f'`{field_name}`={value}')
with self.connection.cursor() as cursor:
cursor.execute(f'SELECT * FROM `{table_name}` WHERE {" AND ".join(conditions_formatted)};')
content = list(map(list, cursor.fetchall()))
return content
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