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uadb.py
executable file
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/
uadb.py
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#!/usr/bin/env pytho
# coding: utf-8
# uadb release 26-09-2019
import json
import sys
import stat
import os
from datetime import date
import re
try:
from StringIO import StringIO
except ImportError:
from io import StringIO
import warnings
warnings.filterwarnings("error")
# from pdb import set_trace
# import pprint
# pp = pprint.pprint
__name__ = "uadb"
__date__ = "12-12-2019"
__version__ = "0.1.8"
__author__ = "Giuseppe Materni"
class Log(object):
def __init__(self, path_log, out=1):
self.out = out
self.path_log = path_log
self.log_start = 0
def log(self, t):
# if isinstance(t, unicode):
# t = t.encode('ascii', 'replace')
# t = t.encode('ascii', 'replace')
s = str(t)
if self.out == 1:
print(s)
with open(self.path_log, "a+") as f:
f.write(s)
f.write(os.linesep)
if self.log_start == 0:
self.log_start = 1
os.chmod(self.path_log, 0o666)
return self
logerr = Log("uadb.log", out=1)
"""
class UaDb
from_file(cls, file_name):
from_pars(cls, pars):
connect(self):
fetchall(self, sql, params=[], size=None):
return Result
execute(self, sql, params=[]):
insert_row(self, table, row):
class Result
properties:
cols
rowset
rows
json
methods:
value(row_num,col_name)
csv(header=1,sep='|')
write_csv(header=1,sep='|')
write_json()
"""
class DB(object):
DATE = 'date'
TIMESTAMP = 'timestamp'
DECIMAL = 'decimal'
STRING = 'string'
LONG = 'long'
INT = 'int'
BOOL = 'bool'
class UaDb(object):
@classmethod
def from_file(cls, file_name):
f = open(file_name, "r+")
txt = f.read()
f.close()
pars = json.loads(txt)
return cls.from_pars(pars)
# pars={'engine':<value>,'host':<value>..}
@classmethod
def from_pars(cls, pars):
engine_ = pars['engine']
host_ = pars.get('host', None)
user_ = pars.get('user', None)
passwd_ = pars.get('passwd', None)
db_ = pars['db']
return cls(engine=engine_, host=host_, user=user_, passwd=passwd_, db=db_)
def __init__(self, engine=None, host=None, user=None, passwd=None, db=None):
self.engine = engine
self.host = host
self.user = user
self.passwd = passwd
self.db = db
self.db_types = {
DB.DATE: -1,
DB.TIMESTAMP: -1,
DB.STRING: -1,
DB.LONG: -1,
DB.INT: -1,
DB.BOOL: -1,
DB.DECIMAL: -1}
self.tag = None
self.conn = None
self.connect()
# gestione tipi per i diversi DB
def connect(self):
try:
if self.engine == "sqlite":
import sqlite3
self.db_types[DB.DATE] = 10
self.db_types[DB.TIMESTAMP] = -1
self.db_types[DB.INT] = -1
self.db_types[DB.LONG] = -1
self.db_types[DB.DECIMAL] = -1
self.db_types[DB.STRING] = -1
self.tag = "?"
self.conn = sqlite3.connect(self.db)
elif self.engine == "odbc":
import pyodbc
# $conn = odbc_connect("DRIVER={IBM i Access ODBC Driver 64-bit};System=my_iSeries", 'my_i_UID', 'my_i_PWD'); $a = 'Doe';
# pyodbc_driver_name = "{IBM i Access ODBC Driver 64-bit}"
# pyodbc_driver_name = "{IBM DB2 ODBC DRIVER}"
pyodbc_driver_name = "{iSeries Access ODBC Driver}"
# self.db_types[DB.DATE] = 1082
# self.db_types[DB.TIMESTAMP] = -1114
if self.passwd is not None and len(self.passwd) > 2:
self.conn = pyodbc.connect(
driver=pyodbc_driver_name,
system=self.host,
database=self.db,
uid=self.user,
pwd=self.passwd)
else:
self.conn = pyodbc.connect(host=self.host, database=self.db, user=self.user)
elif self.engine == "mysql":
import MySQLdb
self.db_types[DB.DATE] = MySQLdb.FIELD_TYPE.DATE
"""
self.db_types[DB.TIMESTAMP] = -1
self.db_types[DB.INT] = 3
self.db_types[DB.LONG] = 8
self.db_types[DB.DECIMAL] = 246
self.db_types[DB.STRING] = 253
"""
self.db_types[DB.STRING] = MySQLdb.FIELD_TYPE.DATE
# self.db_types[DB.DATE] = 10
self.db_types[DB.TIMESTAMP] = -1
self.db_types[DB.INT] = 3
self.db_types[DB.LONG] = 8
self.db_types[DB.DECIMAL] = 246
# self.db_types[DB.STRING] = 253
# self.db_types[DB.STRING] = 254
if self.passwd is not None and len(self.passwd) > 2:
self.conn = MySQLdb.connect(host=self.host,
db=self.db,
user=self.user,
passwd=self.passwd)
else:
self.conn = MySQLdb.connect(host=self.host,
db=self.db,
user=self.user)
elif self.engine == "postgresql":
import psycopg2
self.db_types[DB.DATE] = 1082
self.db_types[DB.TIMESTAMP] = 1114
self.db_types[DB.BOOL] = 16
self.db_types[DB.INT] = 23
self.db_types[DB.LONG] = -1
self.db_types[DB.DECIMAL] = 1700
self.db_types[DB.STRING] = 1043
if self.passwd is not None and len(self.passwd) > 2:
self.conn = psycopg2.connect(host=self.host,
database=self.db,
user=self.user,
password=self.passwd)
else:
self.conn = psycopg2.connect(host=self.host,
database=self.db,
user=self.user)
elif self.engine == "oracle":
import cx_Oracle
port = 1521
self.db_types[DB.DATE] = 1082
self.db_types[DB.TIMESTAMP] = 1114
"""
dsn_tns = cx_Oracle.makedsn(self.host, port, self.db)
self.conn = cx_Oracle.connect(self.user, self.passwd, dsn_tns)
"""
url = "%s/%s@%s:%s/%s" % (self.user, self.passwd, self.host, port, self.db)
self.conn = cx_Oracle.connect(url)
elif self.engine == "mssql":
import pymssql
self.db_types[DB.DATE] = pymssql._mssql.SQLDATETIME
self.db_types[DB.TIMESTAMP] = pymssql._mssql.SQLDATETIME
self.db_types[DB.INT] = pymssql._mssql.SQLINT4
self.db_types[DB.LONG] = pymssql._mssql.SQLINT4
self.db_types[DB.DECIMAL] = pymssql._mssql.SQLDECIMAL
self.db_types[DB.STRING] = pymssql._mssql.STRING
if self.passwd is not None and len(self.passwd) > 2:
self.conn = pymssql.connect(host=self.host,
database=self.db,
user=self.user,
password=self.passwd)
else:
self.conn = pymssql.connect(host=self.host,
database=self.db,
user=self.user)
if self.conn is None:
raise Exception("connection is None")
except Exception as err:
logerr.log("connect error")
logerr.log(err)
sys.exit(0)
# tag usato per la sostituzione in sqlite ? negli altri %s
def __sql_adjust(self, sql):
if self.tag is None:
return sql
else:
return sql.replace('%s', self.tag)
def sql_test(self, sql, pamaters):
s = self._cur.mogrify(sql, pamaters)
return s
def fetchall(self, sql, params=[], size=None):
try:
cur = self.conn.cursor()
sql = self.__sql_adjust(sql)
cur.execute(sql, params)
if size is None:
rows = cur.fetchall()
else:
rows = cur.fetchmany(size)
rt = Result(cur, rows, self.db_types)
return rt
except Exception as err:
logerr.log("fetchall err")
logerr.log(err)
logerr.log(sql)
sys.exit()
def execute(self, sql, params=[]):
try:
sql = self.__sql_adjust(sql)
cur = self.conn.cursor()
rt = cur.execute(sql, params)
self.conn.commit()
return rt
except Exception as err:
logerr.log("uadb.execute error")
logerr.log(err)
raise Exception(sql)
# sys.exit(1)
# table: nome tabella
# row:{'col0':val0,'col1':val1, ..}
def insert_row(self, table, row):
ks = row.keys()
cols = ','.join(ks)
values = row.values()
lst = ['%s' for i in range(len(values))]
pars = ','.join(lst)
rt = None
try:
# insert into table_name ('col1','col2',..) values (%s,%s,...)
sql = "insert into % s (%s) values(%s)" % (table, cols, pars)
cur = self.conn.cursor()
rt = cur.execute(sql, values)
# except Warning as err:
# print(sql)
except Exception as err:
logerr.log("uadb.insert_row ERROR")
s = str(err)
logerr.log(s + os.linesep)
raise Exception(sql)
# sys.exit(1)
self.conn.commit()
return rt
class Result(object):
def __init__(self, cur, rowset, db_types):
self.date_fmt = "%Y-%m-%d"
self.timestamp_fmt = "%Y-%m-%d %H:%M:%S"
self.db_types = db_types
self.cur = cur
self._rowset = rowset
self._cols = None
self._rows = None
self._types = None
self._sizes = None
self._get_description()
def _get_description(self):
desc = self.cur.description
self._cols = []
self._types = []
self._sizes = []
for x in desc:
self._cols.append(x[0])
self._types.append(x[1])
self._sizes.append(x[3])
@property
def cols(self):
return self._cols
@property
def types(self):
return self._types
def value(self, row_num, col_name):
n = self._cols.index(col_name)
row = self._rowset[row_num]
return row[n]
@property
def rowset_native(self):
return self._rowset
def _adjust_field(self, r, i):
t = self._types[i]
v = r[i]
"""
f = self.cols[i]
tp = str(type(v))
tp = tp.replace('<type', '').replace('>', '').replace('\'', '').replace('<class', '').strip()
s = "{:3} {:20} {:15} {:10} {}".format(i, f, tp, t, v)
print(s)
"""
if v is None:
return v
try:
if t == self.db_types[DB.DATE]:
if len(str(v)) < 9:
return None
v = date.strftime(v, self.date_fmt)
elif t == self.db_types[DB.TIMESTAMP]:
v = date.strftime(v, self.timestamp_fmt)
elif t == self.db_types[DB.DECIMAL]:
v = str(v)
elif t == self.db_types[DB.STRING]:
# XXX da parametrizzare
# v = unicode(v, errors='ignore')
v = re.sub(r'[^\x00-\x7F]', ' ', v)
# v = v.decode('cp1252').encode('utf-8')
except Exception as err:
logerr.log("adjust err")
logerr.log(err)
logerr.log(">>> type:%s column:%s v:%s " % (t, i, v))
v = None
return v
# ritorna una lista di liste [[val1,vale,..][val1,val2,..]]
@property
def rowset(self):
le = len(self._cols)
rows = []
for r in self._rowset:
row = []
for i in range(le):
v = self._adjust_field(r, i)
row.append(v)
rows.append(row)
return rows
# ritrona una lista di Dict [{'col1:val1,'col2':val2, ..},{},{}]
@property
def rows(self):
le = len(self._cols)
rs = []
for r in self._rowset:
row = {}
for i in range(le):
v = self._adjust_field(r, i)
row[self._cols[i]] = v
rs.append(row)
return rs
# ritorna un file testo nel formato csv ["val0|val1|..","val0|val1|..",..]
def csv(self, header=1, sep='|'):
out = StringIO()
le = len(self._cols)
if header:
out.write(sep.join(self._cols))
out.write(os.linesep)
for r in self._rowset:
v = self._adjust_field(r, 0)
out.write(str(v).strip())
for i in range(1, le):
v = self._adjust_field(r, i)
out.write(sep)
out.write(str(v).strip())
out.write(os.linesep)
out.flush()
return out.getvalue()
# ritorna un testo di [{'col1:val1,'col2':val2, ..},{},{}]
@property
def json(self):
return json.JSONEncoder().encode(self.rows)
def _write(self, file_name, txt):
f = open(file_name, 'w+')
f.write(txt)
f.close()
os.chmod(file_name, stat.S_IRWXG + stat.S_IRWXU + stat.S_IRWXO)
def write_csv(self, file_name, header=1, sep='|'):
csv = self.csv(header, sep)
self._write(file_name, csv)
def write_json(self, file_name):
self._write(file_name, self.json)