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odbc_helper.py
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odbc_helper.py
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import pyodbc
from pyodbc import ProgrammingError
import sqlparse
import re
from sqlparse.sql import Token
from sqlparse.sql import TokenList
from sqlparse.sql import IdentifierList
from copy import deepcopy
from results_container import Column
class ODBCHelper:
driver = ''
server = ''
port = ''
database = ''
user = ''
password = ''
connection = None
cursor = None
rows = None
tables = None
db_tables = None
db_columns = {}
def __init__(self, driver, server, port, database, user, password):
self.driver = driver
self.server = server
self.port = port
self.database = database
self.user = user
self.password = password
def connect(self):
self.connection = pyodbc.connect(
'DRIVER={' + self.driver + '};SERVER=' + self.server + ';PORT=' +
self.port + ';DATABASE=' + self.database + ';UID=' + self.user +
';PWD=' + self.password)
def disconnect(self):
self.clean()
self.connection.close()
def clean(self):
if (self.cursor is not None):
self.cursor.close()
self.rows = None
self.tables = None
self.db_columns = {}
self.db_tables = None
self.cursor = self.connection.cursor()
self.db_tables = deepcopy([(x[2], x[1], x[0])
for x in self.cursor.tables()])
def clear_cache(self):
self.db_columns = {}
def destroy(self):
self.clear_cache()
def execute_query(self, query):
self.clean()
stmt = sqlparse.parse(query)[0]
query = query.encode('utf-8')
self.cursor.execute(query)
if stmt.get_type() in ["SELECT"] and self.cursor.rowcount > 0:
try:
self.rows = self.cursor.fetchall()
except ProgrammingError as e:
self.rows = []
else:
if stmt.get_type() in ["DELETE"]:
self.cursor.commit()
self.rows = []
result = map(lambda x:[cell.encode('utf-8') if isinstance(cell,unicode) else str(cell) if cell is not None else None for cell in x],[row for row in self.rows])
return result
def get_query_type(self):
if self.rows:
return "select"
elif not self.rows and self.cursor.rowcount < 0:
return "select"
else:
return "update"
def get_update_count(self):
return self.cursor.rowcount
def parse_columns_from_query(self, query):
if self.cursor.description is None:
return []
column_names = [col[0] for col in self.cursor.description]
column_types = [col[0] for col in self.cursor.coldescription]
columns = []
for col_name, col_type_code in zip(column_names, column_types):
self.cursor.getTypeInfo(col_type_code)
col_info = self.cursor.fetchone()
col_type_name = col_info[0]
columns.append(Column(col_name, col_name, col_type_name))
return columns