Abstract common DB methods in mysql.db.DB class and use it as base to implement PgDB, OracleDB and MyDB
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This commit is contained in:
Benjamin Renard 2023-01-07 02:19:18 +01:00
parent 83ce6b9d1b
commit da63f533be
5 changed files with 954 additions and 675 deletions

392
mylib/db.py Normal file
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@ -0,0 +1,392 @@
# -*- coding: utf-8 -*-
""" Basic SQL DB client """
import logging
log = logging.getLogger(__name__)
#
# Exceptions
#
class DBException(Exception):
""" That is the base exception class for all the other exceptions provided by this module. """
def __init__(self, error, *args, **kwargs):
for arg, value in kwargs.items():
setattr(self, arg, value)
super().__init__(error.format(*args, **kwargs))
class DBNotImplemented(DBException, RuntimeError):
"""
Raised when calling a method not implemented in child class
"""
def __init__(self, method, class_name):
super().__init__(
"The method {method} is not yet implemented in class {class_name}",
method=method, class_name=class_name
)
class DBFailToConnect(DBException, RuntimeError):
"""
Raised on connecting error occurred
"""
def __init__(self, uri):
super().__init__(
"An error occured during database connection ({uri})",
uri=uri
)
class DBDuplicatedSQLParameter(DBException, KeyError):
"""
Raised when trying to set a SQL query parameter
and an other parameter with the same name is already set
"""
def __init__(self, parameter_name):
super().__init__(
"Duplicated SQL parameter '{parameter_name}'",
parameter_name=parameter_name
)
class DBUnsupportedWHEREClauses(DBException, TypeError):
"""
Raised when trying to execute query with unsupported
WHERE clauses provided
"""
def __init__(self, where_clauses):
super().__init__(
"Unsupported WHERE clauses: {where_clauses}",
where_clauses=where_clauses
)
class DBInvalidOrderByClause(DBException, TypeError):
"""
Raised when trying to select on table with invalid
ORDER BY clause provided
"""
def __init__(self, order_by):
super().__init__(
"Invalid ORDER BY clause: {order_by}. Must be a string or a list of two values (ordering field name and direction)",
order_by=order_by
)
class DB:
""" Database client """
just_try = False
def __init__(self, just_try=False, **kwargs):
self.just_try = just_try
self._conn = None
for arg, value in kwargs.items():
setattr(self, f'_{arg}', value)
def connect(self, exit_on_error=True):
""" Connect to DB server """
raise DBNotImplemented('connect', self.__class__.__name__)
def close(self):
""" Close connection with DB server (if opened) """
if self._conn:
self._conn.close()
self._conn = None
@staticmethod
def _log_query(sql, params):
log.debug(
'Run SQL query "%s" %s',
sql,
"with params = {0}".format( # pylint: disable=consider-using-f-string
', '.join([
f'{key} = {value}'
for key, value in params.items()
]) if params else "without params"
)
)
@staticmethod
def _log_query_exception(sql, params):
log.exception(
'Error during SQL query "%s" %s',
sql,
"with params = {0}".format( # pylint: disable=consider-using-f-string
', '.join([
f'{key} = {value}'
for key, value in params.items()
]) if params else "without params"
)
)
def doSQL(self, sql, params=None):
"""
Run SQL query and commit changes (rollback on error)
:param sql: The SQL query
:param params: The SQL query's parameters as dict (optional)
:return: True on success, False otherwise
:rtype: bool
"""
raise DBNotImplemented('doSQL', self.__class__.__name__)
def doSelect(self, sql, params=None):
"""
Run SELECT SQL query and return list of selected rows as dict
:param sql: The SQL query
:param params: The SQL query's parameters as dict (optional)
:return: List of selected rows as dict on success, False otherwise
:rtype: list, bool
"""
raise DBNotImplemented('doSelect', self.__class__.__name__)
#
# SQL helpers
#
@staticmethod
def _quote_table_name(table):
""" Quote table name """
return '"{0}"'.format( # pylint: disable=consider-using-f-string
'"."'.join(
table.split('.')
)
)
@staticmethod
def _quote_field_name(field):
""" Quote table name """
return f'"{field}"'
@staticmethod
def format_param(param):
""" Format SQL query parameter for prepared query """
return f'%({param})s'
@classmethod
def _combine_params(cls, params, to_add=None, **kwargs):
if to_add:
assert isinstance(to_add, dict), "to_add must be a dict or None"
params = cls._combine_params(params, **to_add)
for param, value in kwargs.items():
if param in params:
raise DBDuplicatedSQLParameter(param)
params[param] = value
return params
@classmethod
def _format_where_clauses(cls, where_clauses, params=None, where_op=None):
"""
Format WHERE clauses
:param where_clauses: The WHERE clauses. Could be:
- a raw SQL WHERE clause as string
- a tuple of two elements: a raw WHERE clause and its parameters as dict
- a dict of WHERE clauses with field name as key and WHERE clause value as value
- a list of any of previous valid WHERE clauses
:param params: Dict of other already set SQL query parameters (optional)
:param where_op: SQL operator used to combine WHERE clauses together (optional, default: AND)
:return: A tuple of two elements: raw SQL WHERE combined clauses and parameters on success
:rtype: string, bool
"""
if params is None:
params = {}
if where_op is None:
where_op = 'AND'
if isinstance(where_clauses, str):
return (where_clauses, params)
if isinstance(where_clauses, tuple) and len(where_clauses) == 2 and isinstance(where_clauses[1], dict):
cls._combine_params(params, where_clauses[1])
return (where_clauses[0], params)
if isinstance(where_clauses, (list, tuple)):
sql_where_clauses = []
for where_clause in where_clauses:
sql2, params = cls._format_where_clauses(where_clause, params=params, where_op=where_op)
sql_where_clauses.append(sql2)
return (
f' {where_op} '.join(sql_where_clauses),
params
)
if isinstance(where_clauses, dict):
sql_where_clauses = []
for field, value in where_clauses.items():
param = field
if field in params:
idx = 1
while param in params:
param = f'{field}_{idx}'
idx += 1
cls._combine_params(params, {param: value})
sql_where_clauses.append(
f'{cls._quote_field_name(field)} = {cls.format_param(param)}'
)
return (
f' {where_op} '.join(sql_where_clauses),
params
)
raise DBUnsupportedWHEREClauses(where_clauses)
@classmethod
def _add_where_clauses(cls, sql, params, where_clauses, where_op=None):
"""
Add WHERE clauses to an SQL query
:param sql: The SQL query to complete
:param params: The dict of parameters of the SQL query to complete
:param where_clauses: The WHERE clause (see _format_where_clauses())
:param where_op: SQL operator used to combine WHERE clauses together (optional, default: see _format_where_clauses())
:return:
:rtype: A tuple of two elements: raw SQL WHERE combined clauses and parameters
"""
if where_clauses:
sql_where, params = cls._format_where_clauses(where_clauses, params=params, where_op=where_op)
sql += " WHERE " + sql_where
return (sql, params)
def insert(self, table, values, just_try=False):
""" Run INSERT SQL query """
# pylint: disable=consider-using-f-string
sql = 'INSERT INTO {0} ({1}) VALUES ({2})'.format(
self._quote_table_name(table),
', '.join([
self._quote_field_name(field)
for field in values.keys()
]),
", ".join([
self.format_param(key)
for key in values
])
)
if just_try:
log.debug("Just-try mode: execute INSERT query: %s", sql)
return True
log.debug(sql)
if not self.doSQL(sql, params=values):
log.error("Fail to execute INSERT query (SQL: %s)", sql)
return False
return True
def update(self, table, values, where_clauses, where_op=None, just_try=False):
""" Run UPDATE SQL query """
# pylint: disable=consider-using-f-string
sql = 'UPDATE {0} SET {1}'.format(
self._quote_table_name(table),
", ".join([
f'{self._quote_field_name(key)} = {self.format_param(key)}'
for key in values
])
)
params = values
try:
sql, params = self._add_where_clauses(sql, params, where_clauses, where_op=where_op)
except (DBDuplicatedSQLParameter, DBUnsupportedWHEREClauses):
log.error('Fail to add WHERE clauses', exc_info=True)
return False
if just_try:
log.debug("Just-try mode: execute UPDATE query: %s", sql)
return True
log.debug(sql)
if not self.doSQL(sql, params=params):
log.error("Fail to execute UPDATE query (SQL: %s)", sql)
return False
return True
def delete(self, table, where_clauses, where_op='AND', just_try=False):
""" Run DELETE SQL query """
sql = f'DELETE FROM {self._quote_table_name(table)}'
params = {}
try:
sql, params = self._add_where_clauses(sql, params, where_clauses, where_op=where_op)
except (DBDuplicatedSQLParameter, DBUnsupportedWHEREClauses):
log.error('Fail to add WHERE clauses', exc_info=True)
return False
if just_try:
log.debug("Just-try mode: execute UPDATE query: %s", sql)
return True
log.debug(sql)
if not self.doSQL(sql, params=params):
log.error("Fail to execute UPDATE query (SQL: %s)", sql)
return False
return True
def truncate(self, table, just_try=False):
""" Run TRUNCATE SQL query """
sql = f'TRUNCATE TABLE {self._quote_table_name(table)}'
if just_try:
log.debug("Just-try mode: execute TRUNCATE query: %s", sql)
return True
log.debug(sql)
if not self.doSQL(sql):
log.error("Fail to execute TRUNCATE query (SQL: %s)", sql)
return False
return True
def select(self, table, where_clauses=None, fields=None, where_op='AND', order_by=None, just_try=False):
""" Run SELECT SQL query """
sql = "SELECT "
if fields is None:
sql += "*"
elif isinstance(fields, str):
sql += f'{self._quote_field_name(fields)}'
else:
sql += ', '.join([self._quote_field_name(field) for field in fields])
sql += f' FROM {self._quote_table_name(table)}'
params = {}
try:
sql, params = self._add_where_clauses(sql, params, where_clauses, where_op=where_op)
except (DBDuplicatedSQLParameter, DBUnsupportedWHEREClauses):
log.error('Fail to add WHERE clauses', exc_info=True)
return False
if order_by:
if isinstance(order_by, str):
sql += f' ORDER BY {order_by}'
elif (
isinstance(order_by, (list, tuple)) and len(order_by) == 2
and isinstance(order_by[0], str)
and isinstance(order_by[1], str)
and order_by[1].upper() in ('ASC', 'UPPER')
):
sql += f' ORDER BY "{order_by[0]}" {order_by[1].upper()}'
else:
raise DBInvalidOrderByClause(order_by)
if just_try:
log.debug("Just-try mode: execute SELECT query : %s", sql)
return just_try
return self.doSelect(sql, params=params)

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@ -8,53 +8,106 @@ import sys
import MySQLdb import MySQLdb
from MySQLdb._exceptions import Error from MySQLdb._exceptions import Error
from mylib.db import DB
from mylib.db import DBFailToConnect
log = logging.getLogger(__name__) log = logging.getLogger(__name__)
class MyDB: class MyDB(DB):
""" MySQL client """ """ MySQL client """
host = "" _host = None
user = "" _user = None
pwd = "" _pwd = None
db = "" _db = None
con = 0 def __init__(self, host, user, pwd, db, charset=None, **kwargs):
self._host = host
self._user = user
self._pwd = pwd
self._db = db
self._charset = charset if charset else 'utf8'
super().__init__(**kwargs)
def __init__(self, host, user, pwd, db): def connect(self, exit_on_error=True):
self.host = host
self.user = user
self.pwd = pwd
self.db = db
def connect(self):
""" Connect to MySQL server """ """ Connect to MySQL server """
if self.con == 0: if self._conn is None:
try: try:
con = MySQLdb.connect(self.host, self.user, self.pwd, self.db) self._conn = MySQLdb.connect(
self.con = con host=self._host, user=self._user, passwd=self._pwd,
except Error: db=self._db, charset=self._charset, use_unicode=True)
log.fatal('Error connecting to MySQL server', exc_info=True) except Error as err:
log.fatal(
'An error occured during MySQL database connection (%s@%s:%s).',
self._user, self._host, self._db, exc_info=1
)
if exit_on_error:
sys.exit(1) sys.exit(1)
else:
raise DBFailToConnect(f'{self._user}@{self._host}:{self._db}') from err
return True
def doSQL(self, sql): def doSQL(self, sql, params=None):
""" Run INSERT/UPDATE/DELETE/... SQL query """ """
cursor = self.con.cursor() Run SQL query and commit changes (rollback on error)
:param sql: The SQL query
:param params: The SQL query's parameters as dict (optional)
:return: True on success, False otherwise
:rtype: bool
"""
if self.just_try:
log.debug("Just-try mode : do not really execute SQL query '%s'", sql)
return True
cursor = self._conn.cursor()
try: try:
cursor.execute(sql) self._log_query(sql, params)
self.con.commit() cursor.execute(sql, params)
self._conn.commit()
return True return True
except Error: except Error:
log.error('Error during SQL request "%s"', sql, exc_info=True) self._log_query_exception(sql, params)
self.con.rollback() self._conn.rollback()
return False return False
def doSelect(self, sql): def doSelect(self, sql, params=None):
""" Run SELECT SQL query and return result as dict """ """
cursor = self.con.cursor() Run SELECT SQL query and return list of selected rows as dict
:param sql: The SQL query
:param params: The SQL query's parameters as dict (optional)
:return: List of selected rows as dict on success, False otherwise
:rtype: list, bool
"""
try: try:
cursor.execute(sql) self._log_query(sql, params)
return cursor.fetchall() cursor = self._conn.cursor()
cursor.execute(sql, params)
return [
dict(
(field[0], row[idx])
for idx, field in enumerate(cursor.description)
)
for row in cursor.fetchall()
]
except Error: except Error:
log.error('Error during SQL request "%s"', sql, exc_info=True) self._log_query_exception(sql, params)
return False return False
@staticmethod
def _quote_table_name(table):
""" Quote table name """
return '`{0}`'.format( # pylint: disable=consider-using-f-string
'`.`'.join(
table.split('.')
)
)
@staticmethod
def _quote_field_name(field):
""" Quote table name """
return f'`{field}`'

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@ -7,82 +7,24 @@ import sys
import cx_Oracle import cx_Oracle
from mylib.db import DB
from mylib.db import DBFailToConnect
log = logging.getLogger(__name__) log = logging.getLogger(__name__)
# class OracleDB(DB):
# Exceptions
#
class OracleDBException(Exception):
""" That is the base exception class for all the other exceptions provided by this module. """
def __init__(self, error, *args, **kwargs):
for arg, value in kwargs.items():
setattr(self, arg, value)
super().__init__(error.format(*args, **kwargs))
class OracleDBFailToConnect(OracleDBException, RuntimeError):
"""
Raised on connecting error occurred
"""
def __init__(self, dsn, user):
super().__init__(
"An error occured during Oracle database connection ({user}@{dsn})",
user=user, dsn=dsn
)
class OracleDBDuplicatedSQLParameter(OracleDBException, KeyError):
"""
Raised when trying to set a SQL query parameter
and an other parameter with the same name is already set
"""
def __init__(self, parameter_name):
super().__init__(
"Duplicated SQL parameter '{parameter_name}'",
parameter_name=parameter_name
)
class OracleDBUnsupportedWHEREClauses(OracleDBException, TypeError):
"""
Raised when trying to execute query with unsupported
WHERE clauses provided
"""
def __init__(self, where_clauses):
super().__init__(
"Unsupported WHERE clauses: {where_clauses}",
where_clauses=where_clauses
)
class OracleDBInvalidOrderByClause(OracleDBException, TypeError):
"""
Raised when trying to select on table with invalid
ORDER BY clause provided
"""
def __init__(self, order_by):
super().__init__(
"Invalid ORDER BY clause: {order_by}. Must be a string or a list of two values (ordering field name and direction)",
order_by=order_by
)
class OracleDB:
""" Oracle client """ """ Oracle client """
def __init__(self, dsn, user, pwd, just_try=False): _dsn = None
_user = None
_pwd = None
def __init__(self, dsn, user, pwd, **kwargs):
self._dsn = dsn self._dsn = dsn
self._user = user self._user = user
self._pwd = pwd self._pwd = pwd
self._conn = None super().__init__(**kwargs)
self.just_try = just_try
def connect(self, exit_on_error=True): def connect(self, exit_on_error=True):
""" Connect to Oracle server """ """ Connect to Oracle server """
@ -102,41 +44,9 @@ class OracleDB:
if exit_on_error: if exit_on_error:
sys.exit(1) sys.exit(1)
else: else:
raise OracleDBFailToConnect(self._dsn, self._user) from err raise DBFailToConnect(f'{self._user}@{self._dsn}') from err
return True return True
def close(self):
""" Close connection with Oracle server (if opened) """
if self._conn:
self._conn.close()
self._conn = None
@staticmethod
def _log_query(sql, params):
log.debug(
'Run SQL query "%s" %s',
sql,
"with params = {0}".format( # pylint: disable=consider-using-f-string
', '.join([
f'{key} = {value}'
for key, value in params.items()
]) if params else "without params"
)
)
@staticmethod
def _log_query_exception(sql, params):
log.exception(
'Error during SQL query "%s" %s',
sql,
"with params = {0}".format( # pylint: disable=consider-using-f-string
', '.join([
f'{key} = {value}'
for key, value in params.items()
]) if params else "without params"
)
)
def doSQL(self, sql, params=None): def doSQL(self, sql, params=None):
""" """
Run SQL query and commit changes (rollback on error) Run SQL query and commit changes (rollback on error)
@ -199,222 +109,3 @@ class OracleDB:
def format_param(param): def format_param(param):
""" Format SQL query parameter for prepared query """ """ Format SQL query parameter for prepared query """
return f':{param}' return f':{param}'
@classmethod
def _combine_params(cls, params, to_add=None, **kwargs):
if to_add:
assert isinstance(to_add, dict), "to_add must be a dict or None"
params = cls._combine_params(params, **to_add)
for param, value in kwargs.items():
if param in params:
raise OracleDBDuplicatedSQLParameter(param)
params[param] = value
return params
@classmethod
def _format_where_clauses(cls, where_clauses, params=None, where_op=None):
"""
Format WHERE clauses
:param where_clauses: The WHERE clauses. Could be:
- a raw SQL WHERE clause as string
- a tuple of two elements: a raw WHERE clause and its parameters as dict
- a dict of WHERE clauses with field name as key and WHERE clause value as value
- a list of any of previous valid WHERE clauses
:param params: Dict of other already set SQL query parameters (optional)
:param where_op: SQL operator used to combine WHERE clauses together (optional, default: AND)
:return: A tuple of two elements: raw SQL WHERE combined clauses and parameters on success
:rtype: string, bool
"""
if params is None:
params = {}
if where_op is None:
where_op = 'AND'
if isinstance(where_clauses, str):
return (where_clauses, params)
if isinstance(where_clauses, tuple) and len(where_clauses) == 2 and isinstance(where_clauses[1], dict):
cls._combine_params(params, where_clauses[1])
return (where_clauses[0], params)
if isinstance(where_clauses, (list, tuple)):
sql_where_clauses = []
for where_clause in where_clauses:
sql2, params = cls._format_where_clauses(where_clause, params=params, where_op=where_op)
sql_where_clauses.append(sql2)
return (
f' {where_op} '.join(sql_where_clauses),
params
)
if isinstance(where_clauses, dict):
sql_where_clauses = []
for field, value in where_clauses.items():
param = field
if field in params:
idx = 1
while param in params:
param = f'{field}_{idx}'
idx += 1
cls._combine_params(params, {param: value})
sql_where_clauses.append(
f'"{field}" = {cls.format_param(param)}'
)
return (
f' {where_op} '.join(sql_where_clauses),
params
)
raise OracleDBUnsupportedWHEREClauses(where_clauses)
@classmethod
def _add_where_clauses(cls, sql, params, where_clauses, where_op=None):
"""
Add WHERE clauses to an SQL query
:param sql: The SQL query to complete
:param params: The dict of parameters of the SQL query to complete
:param where_clauses: The WHERE clause (see _format_where_clauses())
:param where_op: SQL operator used to combine WHERE clauses together (optional, default: see _format_where_clauses())
:return:
:rtype: A tuple of two elements: raw SQL WHERE combined clauses and parameters
"""
if where_clauses:
sql_where, params = cls._format_where_clauses(where_clauses, params=params, where_op=where_op)
sql += " WHERE " + sql_where
return (sql, params)
@staticmethod
def _quote_table_name(table):
""" Quote table name """
return '"{0}"'.format( # pylint: disable=consider-using-f-string
'"."'.join(
table.split('.')
)
)
def insert(self, table, values, just_try=False):
""" Run INSERT SQL query """
# pylint: disable=consider-using-f-string
sql = 'INSERT INTO {0} ("{1}") VALUES ({2})'.format(
self._quote_table_name(table),
'", "'.join(values.keys()),
", ".join([
self.format_param(key)
for key in values
])
)
if just_try:
log.debug("Just-try mode: execute INSERT query: %s", sql)
return True
log.debug(sql)
if not self.doSQL(sql, params=values):
log.error("Fail to execute INSERT query (SQL: %s)", sql)
return False
return True
def update(self, table, values, where_clauses, where_op=None, just_try=False):
""" Run UPDATE SQL query """
# pylint: disable=consider-using-f-string
sql = 'UPDATE {0} SET {1}'.format(
self._quote_table_name(table),
", ".join([
f'"{key}" = {self.format_param(key)}'
for key in values
])
)
params = values
try:
sql, params = self._add_where_clauses(sql, params, where_clauses, where_op=where_op)
except (OracleDBDuplicatedSQLParameter, OracleDBUnsupportedWHEREClauses):
log.error('Fail to add WHERE clauses', exc_info=True)
return False
if just_try:
log.debug("Just-try mode: execute UPDATE query: %s", sql)
return True
log.debug(sql)
if not self.doSQL(sql, params=params):
log.error("Fail to execute UPDATE query (SQL: %s)", sql)
return False
return True
def delete(self, table, where_clauses, where_op='AND', just_try=False):
""" Run DELETE SQL query """
sql = f'DELETE FROM {self._quote_table_name(table)}'
params = {}
try:
sql, params = self._add_where_clauses(sql, params, where_clauses, where_op=where_op)
except (OracleDBDuplicatedSQLParameter, OracleDBUnsupportedWHEREClauses):
log.error('Fail to add WHERE clauses', exc_info=True)
return False
if just_try:
log.debug("Just-try mode: execute UPDATE query: %s", sql)
return True
log.debug(sql)
if not self.doSQL(sql, params=params):
log.error("Fail to execute UPDATE query (SQL: %s)", sql)
return False
return True
def truncate(self, table, just_try=False):
""" Run TRUNCATE SQL query """
sql = f'TRUNCATE TABLE {self._quote_table_name(table)}'
if just_try:
log.debug("Just-try mode: execute TRUNCATE query: %s", sql)
return True
log.debug(sql)
if not self.doSQL(sql):
log.error("Fail to execute TRUNCATE query (SQL: %s)", sql)
return False
return True
def select(self, table, where_clauses=None, fields=None, where_op='AND', order_by=None, just_try=False):
""" Run SELECT SQL query """
sql = "SELECT "
if fields is None:
sql += "*"
elif isinstance(fields, str):
sql += f'"{fields}"'
else:
sql += '"{0}"'.format('", "'.join(fields)) # pylint: disable=consider-using-f-string
sql += f' FROM {self._quote_table_name(table)}'
params = {}
try:
sql, params = self._add_where_clauses(sql, params, where_clauses, where_op=where_op)
except (OracleDBDuplicatedSQLParameter, OracleDBUnsupportedWHEREClauses):
log.error('Fail to add WHERE clauses', exc_info=True)
return False
if order_by:
if isinstance(order_by, str):
sql += f' ORDER BY {order_by}'
elif (
isinstance(order_by, (list, tuple)) and len(order_by) == 2
and isinstance(order_by[0], str)
and isinstance(order_by[1], str)
and order_by[1].upper() in ('ASC', 'UPPER')
):
sql += f' ORDER BY "{order_by[0]}" {order_by[1].upper()}'
else:
raise OracleDBInvalidOrderByClause(order_by)
if just_try:
log.debug("Just-try mode: execute SELECT query : %s", sql)
return just_try
return self.doSelect(sql, params=params)

View file

@ -8,86 +8,28 @@ import sys
import psycopg2 import psycopg2
from mylib.db import DB, DBFailToConnect
log = logging.getLogger(__name__) log = logging.getLogger(__name__)
# class PgDB(DB):
# Exceptions
#
class PgDBException(Exception):
""" That is the base exception class for all the other exceptions provided by this module. """
def __init__(self, error, *args, **kwargs):
for arg, value in kwargs.items():
setattr(self, arg, value)
super().__init__(error.format(*args, **kwargs))
class PgDBFailToConnect(PgDBException, RuntimeError):
"""
Raised on connecting error occurred
"""
def __init__(self, host, user, db):
super().__init__(
"An error occured during Postgresql database connection ({user}@{host}, database={db})",
user=user, host=host, db=db
)
class PgDBDuplicatedSQLParameter(PgDBException, KeyError):
"""
Raised when trying to set a SQL query parameter
and an other parameter with the same name is already set
"""
def __init__(self, parameter_name):
super().__init__(
"Duplicated SQL parameter '{parameter_name}'",
parameter_name=parameter_name
)
class PgDBUnsupportedWHEREClauses(PgDBException, TypeError):
"""
Raised when trying to execute query with unsupported
WHERE clauses provided
"""
def __init__(self, where_clauses):
super().__init__(
"Unsupported WHERE clauses: {where_clauses}",
where_clauses=where_clauses
)
class PgDBInvalidOrderByClause(PgDBException, TypeError):
"""
Raised when trying to select on table with invalid
ORDER BY clause provided
"""
def __init__(self, order_by):
super().__init__(
"Invalid ORDER BY clause: {order_by}. Must be a string or a list of two values (ordering field name and direction)",
order_by=order_by
)
class PgDB:
""" PostgreSQL client """ """ PostgreSQL client """
_host = None
_user = None
_pwd = None
_db = None
date_format = '%Y-%m-%d' date_format = '%Y-%m-%d'
datetime_format = '%Y-%m-%d %H:%M:%S' datetime_format = '%Y-%m-%d %H:%M:%S'
def __init__(self, host, user, pwd, db, just_try=False): def __init__(self, host, user, pwd, db, **kwargs):
self._host = host self._host = host
self._user = user self._user = user
self._pwd = pwd self._pwd = pwd
self._db = db self._db = db
self._conn = None super().__init__(**kwargs)
self.just_try = just_try
def connect(self, exit_on_error=True): def connect(self, exit_on_error=True):
""" Connect to PostgreSQL server """ """ Connect to PostgreSQL server """
@ -110,7 +52,7 @@ class PgDB:
if exit_on_error: if exit_on_error:
sys.exit(1) sys.exit(1)
else: else:
raise PgDBFailToConnect(self._host, self._user, self._db) from err raise DBFailToConnect(f'{self._user}@{self._host}:{self._db}') from err
return True return True
def close(self): def close(self):
@ -132,32 +74,6 @@ class PgDB:
) )
return False return False
@staticmethod
def _log_query(sql, params):
log.debug(
'Run SQL query "%s" %s',
sql,
"with params = {0}".format( # pylint: disable=consider-using-f-string
', '.join([
f'{key} = {value}'
for key, value in params.items()
]) if params else "without params"
)
)
@staticmethod
def _log_query_exception(sql, params):
log.exception(
'Error during SQL query "%s" %s',
sql,
"with params = {0}".format( # pylint: disable=consider-using-f-string
', '.join([
f'{key} = {value}'
for key, value in params.items()
]) if params else "without params"
)
)
def doSQL(self, sql, params=None): def doSQL(self, sql, params=None):
""" """
Run SQL query and commit changes (rollback on error) Run SQL query and commit changes (rollback on error)
@ -213,234 +129,6 @@ class PgDB:
for idx, field in enumerate(fields) for idx, field in enumerate(fields)
) )
#
# SQL helpers
#
@staticmethod
def format_param(param):
""" Format SQL query parameter for prepared query """
return f'%({param})s'
@classmethod
def _combine_params(cls, params, to_add=None, **kwargs):
if to_add:
assert isinstance(to_add, dict), "to_add must be a dict or None"
params = cls._combine_params(params, **to_add)
for param, value in kwargs.items():
if param in params:
raise PgDBDuplicatedSQLParameter(param)
params[param] = value
return params
@classmethod
def _format_where_clauses(cls, where_clauses, params=None, where_op=None):
"""
Format WHERE clauses
:param where_clauses: The WHERE clauses. Could be:
- a raw SQL WHERE clause as string
- a tuple of two elements: a raw WHERE clause and its parameters as dict
- a dict of WHERE clauses with field name as key and WHERE clause value as value
- a list of any of previous valid WHERE clauses
:param params: Dict of other already set SQL query parameters (optional)
:param where_op: SQL operator used to combine WHERE clauses together (optional, default: AND)
:return: A tuple of two elements: raw SQL WHERE combined clauses and parameters on success
:rtype: string, bool
"""
if params is None:
params = {}
if where_op is None:
where_op = 'AND'
if isinstance(where_clauses, str):
return (where_clauses, params)
if isinstance(where_clauses, tuple) and len(where_clauses) == 2 and isinstance(where_clauses[1], dict):
cls._combine_params(params, where_clauses[1])
return (where_clauses[0], params)
if isinstance(where_clauses, (list, tuple)):
sql_where_clauses = []
for where_clause in where_clauses:
sql2, params = cls._format_where_clauses(where_clause, params=params, where_op=where_op)
sql_where_clauses.append(sql2)
return (
f' {where_op} '.join(sql_where_clauses),
params
)
if isinstance(where_clauses, dict):
sql_where_clauses = []
for field, value in where_clauses.items():
param = field
if field in params:
idx = 1
while param in params:
param = f'{field}_{idx}'
idx += 1
cls._combine_params(params, {param: value})
sql_where_clauses.append(
f'"{field}" = {cls.format_param(param)}'
)
return (
f' {where_op} '.join(sql_where_clauses),
params
)
raise PgDBUnsupportedWHEREClauses(where_clauses)
@classmethod
def _add_where_clauses(cls, sql, params, where_clauses, where_op=None):
"""
Add WHERE clauses to an SQL query
:param sql: The SQL query to complete
:param params: The dict of parameters of the SQL query to complete
:param where_clauses: The WHERE clause (see _format_where_clauses())
:param where_op: SQL operator used to combine WHERE clauses together (optional, default: see _format_where_clauses())
:return:
:rtype: A tuple of two elements: raw SQL WHERE combined clauses and parameters
"""
if where_clauses:
sql_where, params = cls._format_where_clauses(where_clauses, params=params, where_op=where_op)
sql += " WHERE " + sql_where
return (sql, params)
@staticmethod
def _quote_table_name(table):
""" Quote table name """
return '"{0}"'.format( # pylint: disable=consider-using-f-string
'"."'.join(
table.split('.')
)
)
def insert(self, table, values, just_try=False):
""" Run INSERT SQL query """
# pylint: disable=consider-using-f-string
sql = 'INSERT INTO {0} ("{1}") VALUES ({2})'.format(
self._quote_table_name(table),
'", "'.join(values.keys()),
", ".join([
self.format_param(key)
for key in values
])
)
if just_try:
log.debug("Just-try mode: execute INSERT query: %s", sql)
return True
log.debug(sql)
if not self.doSQL(sql, params=values):
log.error("Fail to execute INSERT query (SQL: %s)", sql)
return False
return True
def update(self, table, values, where_clauses, where_op=None, just_try=False):
""" Run UPDATE SQL query """
# pylint: disable=consider-using-f-string
sql = 'UPDATE {0} SET {1}'.format(
self._quote_table_name(table),
", ".join([
f'"{key}" = {self.format_param(key)}'
for key in values
])
)
params = values
try:
sql, params = self._add_where_clauses(sql, params, where_clauses, where_op=where_op)
except (PgDBDuplicatedSQLParameter, PgDBUnsupportedWHEREClauses):
log.error('Fail to add WHERE clauses', exc_info=True)
return False
if just_try:
log.debug("Just-try mode: execute UPDATE query: %s", sql)
return True
log.debug(sql)
if not self.doSQL(sql, params=params):
log.error("Fail to execute UPDATE query (SQL: %s)", sql)
return False
return True
def delete(self, table, where_clauses, where_op='AND', just_try=False):
""" Run DELETE SQL query """
sql = f'DELETE FROM {self._quote_table_name(table)}'
params = {}
try:
sql, params = self._add_where_clauses(sql, params, where_clauses, where_op=where_op)
except (PgDBDuplicatedSQLParameter, PgDBUnsupportedWHEREClauses):
log.error('Fail to add WHERE clauses', exc_info=True)
return False
if just_try:
log.debug("Just-try mode: execute UPDATE query: %s", sql)
return True
log.debug(sql)
if not self.doSQL(sql, params=params):
log.error("Fail to execute UPDATE query (SQL: %s)", sql)
return False
return True
def truncate(self, table, just_try=False):
""" Run TRUNCATE SQL query """
sql = f'TRUNCATE TABLE {self._quote_table_name(table)}'
if just_try:
log.debug("Just-try mode: execute TRUNCATE query: %s", sql)
return True
log.debug(sql)
if not self.doSQL(sql):
log.error("Fail to execute TRUNCATE query (SQL: %s)", sql)
return False
return True
def select(self, table, where_clauses=None, fields=None, where_op='AND', order_by=None, just_try=False):
""" Run SELECT SQL query """
sql = "SELECT "
if fields is None:
sql += "*"
elif isinstance(fields, str):
sql += f'"{fields}"'
else:
sql += '"{0}"'.format('", "'.join(fields)) # pylint: disable=consider-using-f-string
sql += f' FROM {self._quote_table_name(table)}'
params = {}
try:
sql, params = self._add_where_clauses(sql, params, where_clauses, where_op=where_op)
except (PgDBDuplicatedSQLParameter, PgDBUnsupportedWHEREClauses):
log.error('Fail to add WHERE clauses', exc_info=True)
return False
if order_by:
if isinstance(order_by, str):
sql += f' ORDER BY {order_by}'
elif (
isinstance(order_by, (list, tuple)) and len(order_by) == 2
and isinstance(order_by[0], str)
and isinstance(order_by[1], str)
and order_by[1].upper() in ('ASC', 'UPPER')
):
sql += f' ORDER BY "{order_by[0]}" {order_by[1].upper()}'
else:
raise PgDBInvalidOrderByClause(order_by)
if just_try:
log.debug("Just-try mode: execute SELECT query : %s", sql)
return just_try
return self.doSelect(sql, params=params)
# #
# Depreated helpers # Depreated helpers
# #

455
tests/test_mysql.py Normal file
View file

@ -0,0 +1,455 @@
# pylint: disable=redefined-outer-name,missing-function-docstring,protected-access
""" Tests on opening hours helpers """
import pytest
from MySQLdb._exceptions import Error
from mylib.mysql import MyDB
class FakeMySQLdbCursor:
""" Fake MySQLdb cursor """
def __init__(self, expected_sql, expected_params, expected_return, expected_just_try, expected_exception):
self.expected_sql = expected_sql
self.expected_params = expected_params
self.expected_return = expected_return
self.expected_just_try = expected_just_try
self.expected_exception = expected_exception
def execute(self, sql, params=None):
if self.expected_exception:
raise Error(f'{self}.execute({sql}, {params}): expected exception')
if self.expected_just_try and not sql.lower().startswith('select '):
assert False, f'{self}.execute({sql}, {params}) may not be executed in just try mode'
# pylint: disable=consider-using-f-string
assert sql == self.expected_sql, "%s.execute(): Invalid SQL query:\n '%s'\nMay be:\n '%s'" % (self, sql, self.expected_sql)
# pylint: disable=consider-using-f-string
assert params == self.expected_params, "%s.execute(): Invalid params:\n %s\nMay be:\n %s" % (self, params, self.expected_params)
return self.expected_return
@property
def description(self):
assert self.expected_return
assert isinstance(self.expected_return, list)
assert isinstance(self.expected_return[0], dict)
return [(field, 1, 2, 3) for field in self.expected_return[0].keys()]
def fetchall(self):
if isinstance(self.expected_return, list):
return (
list(row.values())
if isinstance(row, dict) else row
for row in self.expected_return
)
return self.expected_return
def __repr__(self):
return (
f'FakeMySQLdbCursor({self.expected_sql}, {self.expected_params}, '
f'{self.expected_return}, {self.expected_just_try})'
)
class FakeMySQLdb:
""" Fake MySQLdb connection """
expected_sql = None
expected_params = None
expected_return = True
expected_just_try = False
expected_exception = False
just_try = False
def __init__(self, **kwargs):
allowed_kwargs = dict(db=str, user=str, passwd=(str, None), host=str, charset=str, use_unicode=bool)
for arg, value in kwargs.items():
assert arg in allowed_kwargs, f'Invalid arg {arg}="{value}"'
assert isinstance(value, allowed_kwargs[arg]), \
f'Arg {arg} not a {allowed_kwargs[arg]} ({type(value)})'
setattr(self, arg, value)
def close(self):
return self.expected_return
def cursor(self):
return FakeMySQLdbCursor(
self.expected_sql, self.expected_params,
self.expected_return, self.expected_just_try or self.just_try,
self.expected_exception
)
def commit(self):
self._check_just_try()
return self.expected_return
def rollback(self):
self._check_just_try()
return self.expected_return
def _check_just_try(self):
if self.just_try:
assert False, "May not be executed in just try mode"
def fake_mysqldb_connect(**kwargs):
return FakeMySQLdb(**kwargs)
def fake_mysqldb_connect_just_try(**kwargs):
con = FakeMySQLdb(**kwargs)
con.just_try = True
return con
@pytest.fixture
def test_mydb():
return MyDB('127.0.0.1', 'user', 'password', 'dbname')
@pytest.fixture
def fake_mydb(mocker):
mocker.patch('MySQLdb.connect', fake_mysqldb_connect)
return MyDB('127.0.0.1', 'user', 'password', 'dbname')
@pytest.fixture
def fake_just_try_mydb(mocker):
mocker.patch('MySQLdb.connect', fake_mysqldb_connect_just_try)
return MyDB('127.0.0.1', 'user', 'password', 'dbname', just_try=True)
@pytest.fixture
def fake_connected_mydb(fake_mydb):
fake_mydb.connect()
return fake_mydb
@pytest.fixture
def fake_connected_just_try_mydb(fake_just_try_mydb):
fake_just_try_mydb.connect()
return fake_just_try_mydb
def generate_mock_args(expected_args=(), expected_kwargs={}, expected_return=True): # pylint: disable=dangerous-default-value
def mock_args(*args, **kwargs):
# pylint: disable=consider-using-f-string
assert args == expected_args, "Invalid call args:\n %s\nMay be:\n %s" % (args, expected_args)
# pylint: disable=consider-using-f-string
assert kwargs == expected_kwargs, "Invalid call kwargs:\n %s\nMay be:\n %s" % (kwargs, expected_kwargs)
return expected_return
return mock_args
def mock_doSQL_just_try(self, sql, params=None): # pylint: disable=unused-argument
assert False, "doSQL() may not be executed in just try mode"
def generate_mock_doSQL(expected_sql, expected_params={}, expected_return=True): # pylint: disable=dangerous-default-value
def mock_doSQL(self, sql, params=None): # pylint: disable=unused-argument
# pylint: disable=consider-using-f-string
assert sql == expected_sql, "Invalid generated SQL query:\n '%s'\nMay be:\n '%s'" % (sql, expected_sql)
# pylint: disable=consider-using-f-string
assert params == expected_params, "Invalid generated params:\n %s\nMay be:\n %s" % (params, expected_params)
return expected_return
return mock_doSQL
# MyDB.doSelect() have same expected parameters as MyDB.doSQL()
generate_mock_doSelect = generate_mock_doSQL
mock_doSelect_just_try = mock_doSQL_just_try
#
# Test on MyDB helper methods
#
def test_combine_params_with_to_add_parameter():
assert MyDB._combine_params(dict(test1=1), dict(test2=2)) == dict(
test1=1, test2=2
)
def test_combine_params_with_kargs():
assert MyDB._combine_params(dict(test1=1), test2=2) == dict(
test1=1, test2=2
)
def test_combine_params_with_kargs_and_to_add_parameter():
assert MyDB._combine_params(dict(test1=1), dict(test2=2), test3=3) == dict(
test1=1, test2=2, test3=3
)
def test_format_where_clauses_params_are_preserved():
args = ('test = test', dict(test1=1))
assert MyDB._format_where_clauses(*args) == args
def test_format_where_clauses_raw():
assert MyDB._format_where_clauses('test = test') == (('test = test'), {})
def test_format_where_clauses_tuple_clause_with_params():
where_clauses = (
'test1 = %(test1)s AND test2 = %(test2)s',
dict(test1=1, test2=2)
)
assert MyDB._format_where_clauses(where_clauses) == where_clauses
def test_format_where_clauses_dict():
where_clauses = dict(test1=1, test2=2)
assert MyDB._format_where_clauses(where_clauses) == (
'`test1` = %(test1)s AND `test2` = %(test2)s',
where_clauses
)
def test_format_where_clauses_combined_types():
where_clauses = (
'test1 = 1',
('test2 LIKE %(test2)s', dict(test2=2)),
dict(test3=3, test4=4)
)
assert MyDB._format_where_clauses(where_clauses) == (
'test1 = 1 AND test2 LIKE %(test2)s AND `test3` = %(test3)s AND `test4` = %(test4)s',
dict(test2=2, test3=3, test4=4)
)
def test_format_where_clauses_with_where_op():
where_clauses = dict(test1=1, test2=2)
assert MyDB._format_where_clauses(where_clauses, where_op='OR') == (
'`test1` = %(test1)s OR `test2` = %(test2)s',
where_clauses
)
def test_add_where_clauses():
sql = "SELECT * FROM table"
where_clauses = dict(test1=1, test2=2)
assert MyDB._add_where_clauses(sql, None, where_clauses) == (
sql + ' WHERE `test1` = %(test1)s AND `test2` = %(test2)s',
where_clauses
)
def test_add_where_clauses_preserved_params():
sql = "SELECT * FROM table"
where_clauses = dict(test1=1, test2=2)
params = dict(fake1=1)
assert MyDB._add_where_clauses(sql, params.copy(), where_clauses) == (
sql + ' WHERE `test1` = %(test1)s AND `test2` = %(test2)s',
dict(**where_clauses, **params)
)
def test_add_where_clauses_with_op():
sql = "SELECT * FROM table"
where_clauses = ('test1=1', 'test2=2')
assert MyDB._add_where_clauses(sql, None, where_clauses, where_op='OR') == (
sql + ' WHERE test1=1 OR test2=2',
{}
)
def test_add_where_clauses_with_duplicated_field():
sql = "UPDATE table SET test1=%(test1)s"
params = dict(test1='new_value')
where_clauses = dict(test1='where_value')
assert MyDB._add_where_clauses(sql, params, where_clauses) == (
sql + ' WHERE `test1` = %(test1_1)s',
dict(test1='new_value', test1_1='where_value')
)
def test_quote_table_name():
assert MyDB._quote_table_name("mytable") == '`mytable`'
assert MyDB._quote_table_name("myschema.mytable") == '`myschema`.`mytable`'
def test_insert(mocker, test_mydb):
values = dict(test1=1, test2=2)
mocker.patch(
'mylib.mysql.MyDB.doSQL',
generate_mock_doSQL(
'INSERT INTO `mytable` (`test1`, `test2`) VALUES (%(test1)s, %(test2)s)',
values
)
)
assert test_mydb.insert('mytable', values)
def test_insert_just_try(mocker, test_mydb):
mocker.patch('mylib.mysql.MyDB.doSQL', mock_doSQL_just_try)
assert test_mydb.insert('mytable', dict(test1=1, test2=2), just_try=True)
def test_update(mocker, test_mydb):
values = dict(test1=1, test2=2)
where_clauses = dict(test3=3, test4=4)
mocker.patch(
'mylib.mysql.MyDB.doSQL',
generate_mock_doSQL(
'UPDATE `mytable` SET `test1` = %(test1)s, `test2` = %(test2)s WHERE `test3` = %(test3)s AND `test4` = %(test4)s',
dict(**values, **where_clauses)
)
)
assert test_mydb.update('mytable', values, where_clauses)
def test_update_just_try(mocker, test_mydb):
mocker.patch('mylib.mysql.MyDB.doSQL', mock_doSQL_just_try)
assert test_mydb.update('mytable', dict(test1=1, test2=2), None, just_try=True)
def test_delete(mocker, test_mydb):
where_clauses = dict(test1=1, test2=2)
mocker.patch(
'mylib.mysql.MyDB.doSQL',
generate_mock_doSQL(
'DELETE FROM `mytable` WHERE `test1` = %(test1)s AND `test2` = %(test2)s',
where_clauses
)
)
assert test_mydb.delete('mytable', where_clauses)
def test_delete_just_try(mocker, test_mydb):
mocker.patch('mylib.mysql.MyDB.doSQL', mock_doSQL_just_try)
assert test_mydb.delete('mytable', None, just_try=True)
def test_truncate(mocker, test_mydb):
mocker.patch(
'mylib.mysql.MyDB.doSQL',
generate_mock_doSQL('TRUNCATE TABLE `mytable`', None)
)
assert test_mydb.truncate('mytable')
def test_truncate_just_try(mocker, test_mydb):
mocker.patch('mylib.mysql.MyDB.doSQL', mock_doSelect_just_try)
assert test_mydb.truncate('mytable', just_try=True)
def test_select(mocker, test_mydb):
fields = ('field1', 'field2')
where_clauses = dict(test3=3, test4=4)
expected_return = [
dict(field1=1, field2=2),
dict(field1=2, field2=3),
]
order_by = "field1, DESC"
mocker.patch(
'mylib.mysql.MyDB.doSelect',
generate_mock_doSQL(
'SELECT `field1`, `field2` FROM `mytable` WHERE `test3` = %(test3)s AND `test4` = %(test4)s ORDER BY ' + order_by,
where_clauses, expected_return
)
)
assert test_mydb.select('mytable', where_clauses, fields, order_by=order_by) == expected_return
def test_select_without_field_and_order_by(mocker, test_mydb):
mocker.patch(
'mylib.mysql.MyDB.doSelect',
generate_mock_doSQL(
'SELECT * FROM `mytable`'
)
)
assert test_mydb.select('mytable')
def test_select_just_try(mocker, test_mydb):
mocker.patch('mylib.mysql.MyDB.doSQL', mock_doSelect_just_try)
assert test_mydb.select('mytable', None, None, just_try=True)
#
# Tests on main methods
#
def test_connect(mocker, test_mydb):
expected_kwargs = dict(
db=test_mydb._db,
user=test_mydb._user,
host=test_mydb._host,
passwd=test_mydb._pwd,
charset=test_mydb._charset,
use_unicode=True,
)
mocker.patch(
'MySQLdb.connect',
generate_mock_args(
expected_kwargs=expected_kwargs
)
)
assert test_mydb.connect()
def test_close(fake_mydb):
assert fake_mydb.close() is None
def test_close_connected(fake_connected_mydb):
assert fake_connected_mydb.close() is None
def test_doSQL(fake_connected_mydb):
fake_connected_mydb._conn.expected_sql = 'DELETE FROM table WHERE test1 = %(test1)s'
fake_connected_mydb._conn.expected_params = dict(test1=1)
fake_connected_mydb.doSQL(fake_connected_mydb._conn.expected_sql, fake_connected_mydb._conn.expected_params)
def test_doSQL_without_params(fake_connected_mydb):
fake_connected_mydb._conn.expected_sql = 'DELETE FROM table'
fake_connected_mydb.doSQL(fake_connected_mydb._conn.expected_sql)
def test_doSQL_just_try(fake_connected_just_try_mydb):
assert fake_connected_just_try_mydb.doSQL('DELETE FROM table')
def test_doSQL_on_exception(fake_connected_mydb):
fake_connected_mydb._conn.expected_exception = True
assert fake_connected_mydb.doSQL('DELETE FROM table') is False
def test_doSelect(fake_connected_mydb):
fake_connected_mydb._conn.expected_sql = 'SELECT * FROM table WHERE test1 = %(test1)s'
fake_connected_mydb._conn.expected_params = dict(test1=1)
fake_connected_mydb._conn.expected_return = [dict(test1=1)]
assert fake_connected_mydb.doSelect(fake_connected_mydb._conn.expected_sql, fake_connected_mydb._conn.expected_params) == fake_connected_mydb._conn.expected_return
def test_doSelect_without_params(fake_connected_mydb):
fake_connected_mydb._conn.expected_sql = 'SELECT * FROM table'
fake_connected_mydb._conn.expected_return = [dict(test1=1)]
assert fake_connected_mydb.doSelect(fake_connected_mydb._conn.expected_sql) == fake_connected_mydb._conn.expected_return
def test_doSelect_on_exception(fake_connected_mydb):
fake_connected_mydb._conn.expected_exception = True
assert fake_connected_mydb.doSelect('SELECT * FROM table') is False
def test_doSelect_just_try(fake_connected_just_try_mydb):
fake_connected_just_try_mydb._conn.expected_sql = 'SELECT * FROM table WHERE test1 = %(test1)s'
fake_connected_just_try_mydb._conn.expected_params = dict(test1=1)
fake_connected_just_try_mydb._conn.expected_return = [dict(test1=1)]
assert fake_connected_just_try_mydb.doSelect(
fake_connected_just_try_mydb._conn.expected_sql,
fake_connected_just_try_mydb._conn.expected_params
) == fake_connected_just_try_mydb._conn.expected_return