PeterHarding: New page: = Python MS SQL Server Interface Modules = * [http://wiki.python.org/moin/SQL_Server Accessing SQL Server - PythonInfo Wiki] * [http://www.object-craft.com.au/projects/mssql/ MS SQL Serv...

2007-11-09T03:48:51Z

New page: = Python MS SQL Server Interface Modules = * [http://wiki.python.org/moin/SQL_Server Accessing SQL Server - PythonInfo Wiki] * [http://www.object-craft.com.au/projects/mssql/ MS SQL Serv...

New page

= Python MS SQL Server Interface Modules =

* [http://wiki.python.org/moin/SQL_Server Accessing SQL Server - PythonInfo Wiki]
* [http://www.object-craft.com.au/projects/mssql/ MS SQL Server Module by Object Craft]
* [http://pymssql.sourceforge.net/ PyMSSQL @ SourceForge]
* [http://www.egenix.com/products/python/mxODBC/ mxODBC]
* [http://py.vaults.ca/apyllo.py/973100124 Vaults of Parnassus Database Links]
* [http://www.ironpython.info/index.php/Contents IronPython]
* [http://sqlrelay.sourceforge.net/sqlrelay/programming/pythondb.html SQL Relay]

= Other Resources =

== Misc Links ==

* [http://webscripts.softpedia.com/script/Database-Tools/Python-Database-Interface-for-MS-SQL-Server-18442.html]
* [http://www.wiggy.net/code/python-dhm/doc/public/dhm.sqlwrap-module.html]
* [http://www.wiggy.net/code/python-dhm/doc/public/dhm-module.html]

== Using mxODBC ==

How about trying mxODBC ([http://starship.python.net/crew/lemburg/mxODBC.html]).
I found that it's quite easy to install and works great. Besides, the Win32
ODBC module, according to the Python Website, is not currently being maintained by anyone.

Using mxODBC, I found that the following line will create a connection to a database within a CGI script:

<pre>
# Open connect to Database via ODBC
db = Odbc.Windows.DriverConnect('DRIVER={Microsoft ODBC for
Oracle};SERVER=Test;UID=userid;PWD=password;')
</pre>

Obviously, I'm using the ODBC driver for Oracle, so replace this driver with SQL Server.

Good Luck,
Paul

<pre>
"Navtej Riyait" <Navtej.Riyait at ukgateway.net> wrote in message
news:86ioek$iek$1 at lure.pipex.net...
> Hello,
>
> I am trying to create a little test web application in python/HTML using
> IIS. I have setup IIS so that .cgi scripts are sent to the python
> interpreter. I am trying to access a SQL Server database, 'pubs' (using
> Python DB APIs). I am importing odbc, dbi in my script. Database access
> works fine when I run a dbtest script at the command line, but the same bit
> of code gives an error when run in the .cgi script. It is not finding the
> data source name (DSN). I have set up the DSN in the ODBC Driver Manager
> correctly.
>
> I can't see what environment parameters to set to get the .cgi python script
> to access the 'pubs' database. Can anyone help ?
>
>
> Thanks
>
</pre>

= Some Examples =

\\

== Example 1 ==

</pre>
import pymssql

con = pymssql.connect(host='192.168.13.122',user='sa',password='',database='tempdb')
cur = con.cursor()

query="create table pymssql (no int, fno float, comment varchar(50));"
cur.execute(query)
print "create table: %d" % cur.rowcount

for x in range(10):
query="insert into pymssql (no,fno,comment) values (%d,%d.%d,'%dth comment');" % (x+1,x+1,x+1,x+1)
ret=cur.execute(query)
print "insert table: %d" % cur.rowcount

for x in range(10):
query="update pymssql set comment='%dth hahaha.' where no = %d" % (x+1,x+1)
ret=cur.execute(query)
print "update table: %d" % cur.rowcount

query="EXEC sp_tables; select * from pymssql;"

for x in range(10):
cur.execute(query)

while 1:
print cur.fetchall()
if 0 == cur.nextset():
break

query="drop table pymssql;"
cur.execute(query)
print "drop table: %d" % cur.rowcount

con.commit()
con.close()
</pre>

== Example 2 ==

<pre>
import _mssql

mssql=_mssql.connect('192.168.13.122','sa','')
mssql.select_db('tempdb')

# create db

query="create table pymssql (no int, comment varchar(50));"

ret = mssql.query(query)
if ret:
print "create table: %d" % ret
print mssql.fetch_array()
else:
print mssql.errmsg()

# insert

for x in range(10):
query="insert into pymssql (no,comment) values (%d,'%dth comment');" % (x+1,x+1)
ret=mssql.query(query)
if ret:
print "insert table: %d" % ret
print mssql.fetch_array()

else:
print mssql.errmsg()

# update

for x in range(10):
query="update pymssql set comment='%dth hahaha.' where no = %d" % (x+1,x+1)
ret=mssql.query(query)

if ret:
print "update table: %d" % ret
print mssql.fetch_array()
else:
print mssql.errmsg()

# multiple query and multiple result

query="EXEC sp_tables; select * from pymssql;"
for x in range(10):
if mssql.query(query):
header=mssql.fetch_array()
for y in header:
print y
#print x,header[0][0][0],len(header[0][1][0])

else:
print mssql.errmsg()
print mssql.stdmsg()

# drop table

query="drop table pymssql;"
ret = mssql.query(query)
if ret:
print "drop table: %d" % ret
print mssql.fetch_array()

else:
print mssql.errmsg()

mssql.close()
</pre>

= Other Stuff =

== MS SQL Server DBI Implementation ==

This DBI implements the Cursor and Connection objects. It is functional: you can create connections, cursors, do fetchone, fetchall, get rowcount, etc. It uses osql or SQL2005's sqlcmd instead of ODBC or ADO. There is a good sized section with examples to get you started. The SQL2005 support is new, showing improved execution speed for SQL2005's sqlcmd.exe, even when accessing SQL2000 databases.

<pre>

#dblib.py
#created by Jorge Besada

import os,sys

class Connection:
def __init__(self,sname,uname='',password='',db='', version=''):
self.version = version
self.servername = sname
self.username = uname
self.password = password
self.defdb = db
self.constr = ''
if db == '':
self.defdb = 'master'
self.connected = 0
if self.version == None or self.version == "":
print "Need to pass sql version argument"
return self
if self.version == "sql2000" or self.version == "sql7":
execsql = "osql"
if self.version == "sql2005":
execsql = "sqlcmd"
if self.version == "sybase":
execsql = "isql"
print "Sorry, Sybase has not been implemented yet!"
return self
if uname == '':
self.constr = execsql + " -E -S" + self.servername + " -d" + self.defdb + " /w 8192 "
else:
self.constr = execsql + " -U" + self.username + " -P" + self.password + " -S" + self.servername + " -d" + self.defdb + " /w 8192 "

#test connection:
s = "set nocount on select name from master..syslogins where name = 'sa'"
lst = os.popen(self.constr + ' -Q' + '"' + s + '"').readlines()

try:
if lst[2].strip() == 'sa':
self.connected = 1
else:
self.connected = 0
c = Cursor()
c.servername = sname
c.username = uname
c.password = password
c.defdb = db
c.constr = self.constr
self.cursor = c
except IndexError:
print "Could not connect"

def commit(self):
"this is here for compatibility"
pass

def close(self):
self = None
return self

class Cursor:
def __init__(self):
self.defdb = ''
self.servername = ''
self.username = ''
self.password = ''
self.constr = ''
self.rowcount = -1
self.records = []
self.rowid = 0
self.sqlfile = "-Q"
self.colseparator = chr(1) #default column separator
#this is going to be a list of lists, each one with:
#name, type_code, display_size, internal_size, precision, scale, null_ok
self.description = []
self.fieldnames = []
self.fieldvalues = []
self.fieldvalue = []
#one dictionary by column
self.dictfield = {'name':'', 'type_code':0,'display_size':0,'internal_size':0,'precision':0, 'scale':0, 'null_ok':0}
#list of lists
self.dictfields = []

#this is for compatibility to allow both types of calls:
#cursor = connection.cursor() or using cursor = connection.cursor
def __call__(self):
c = Cursor()
return c

def execute(self, s):
self.records = []
lst = os.popen(self.constr + ' -s' + self.colseparator + " " + self.sqlfile + '"' + s + '"').readlines()
if len(lst) == 0:
return self.rowcount

#If we get here we have results
#rowcount maybe in last line, in this form: (4 rows affected)
tmplastline = lst[-1]
if tmplastline[0] == "(": #there is a rowcount
lastline = lst[-1]
spacepos = lastline.index(" ")
count = lastline[1:spacepos]
self.rowcount = int(count)
else:
#last line has no recordcount, so reset it to 0
self.records = lst[:]
self.rowcount = 0
return self.rowcount

#if we got here we may have a rowcount and the list with results
i = 0
#process metadata if we have it:
firstline = lst[0]
lst1 = lst[0].split(self.colseparator)
self.fieldnames = []
for x in lst1:
x1 = x.strip()
self.fieldnames.append(x1) #add column name
#need to make a list for each column name
self.description = []
for x in self.fieldnames:
l = []
l.append(x)
for m in range(len(self.dictfield) - 1):
l.append(0)
l2 = tuple(l)
self.description.append(l2)
self.description = tuple(self.description)

#Data section: lst[0] is row with column names,skip
#If the resulting string starts and ends with '-', discard

for x in lst[1:-1]:
x0 = ''.join(x)
x1 = x0.strip()
if x1 > '' and x1[0] > '-' and x1[-1] > '-':
self.records.append(x1)
#reset for each execution
self.rowid = 0
return self.rowcount

#returns one row of the result set, keeps track of the position
def fetchone(self):
i = self.rowid
j = i + 1
self.rowid = j
try:
return tuple(self.records[i].split(self.colseparator))
except IndexError:
pass

#returns whole recordset
def fetchall(self):
lst = []
try:
for x in range(self.rowid, self.rowcount):
x1 = tuple(self.records[x].split(self.colseparator))
lst.append(x1)
except IndexError:
pass
return lst

def close(self):
self.records = None
self = None
return self

#-----------------------------------------

#Testing harness: we create and drop logins and databases
#Edit connection for desired server name and security options:
#For local server, integrated security
# c = Connection('(local)',db='pubs', version='sql2000')
#For local server, SQL security
# c = Connection('(local)','sa','sa password',db='pubs', version='sql2000')
#The first part of the test uses a restored pubs database
#in a SQL2005 instance (local)\sql1, the second test uses the pubs database
#from the default instance in the same server (local machine)

if __name__ == '__main__':
c = Connection('(local)\sql1',db='pubs', version='sql2005')
print "Connection string: " + c.constr
if c.connected == 1:
print "Connected OK"
cu = c.cursor
lst = cu.execute('select * from authors')
print 'rowcount=' + str(cu.rowcount)
rows = cu.fetchall()
for x in rows:
print x
c.close()

#Several SQL statements test
lst = cu.execute("sp_addlogin 'test2', 'test2'")
print 'rowcount=' + str(cu.rowcount)
lst = cu.execute("select name from master..syslogins where name = 'test2'")
print 'rowcount=' + str(cu.rowcount)
rows = cu.fetchall()
for x in rows:
print x
c.close()

lst = cu.execute("EXEC sp_droplogin 'test2'")
print 'rowcount=' + str(cu.rowcount)
lst = cu.execute("select name from master..syslogins where name = 'test2'")
print 'rowcount=' + str(cu.rowcount)
rows = cu.fetchall()
for x in rows:
print x
c.close()

lst = cu.execute("CREATE DATABASE test")
print 'rowcount=' + str(cu.rowcount)
lst = cu.execute("select name from master..sysdatabases where name = 'test'")
print 'rowcount=' + str(cu.rowcount)
rows = cu.fetchall()
for x in rows:
print x
c.close()

lst = cu.execute("DROP DATABASE test")
print 'rowcount=' + str(cu.rowcount)
lst = cu.execute("select name from master..sysdatabases where name = 'test'")
print 'rowcount=' + str(cu.rowcount)
rows = cu.fetchall()
for x in rows:
print x
c.close()

print "\n\nRepeating test with SQL2000"
c = Connection('(local)',db='pubs', version='sql2000')
print "Connection string: " + c.constr
if c.connected == 1:
print "Connected OK"
cu = c.cursor
lst = cu.execute('select * from authors')
print 'rowcount=' + str(cu.rowcount)
rows = cu.fetchall()
for x in rows:
print x
c.close()
</pre>

Python - MS SQL Server Modules - Revision history

PeterHarding: New page: = Python MS SQL Server Interface Modules = * [http://wiki.python.org/moin/SQL_Server Accessing SQL Server - PythonInfo Wiki] * [http://www.object-craft.com.au/projects/mssql/ MS SQL Serv...