I just started to play around with python, and i really like it. I am able to connect to my database using pydobc and print the results. However, i need help taking the next step to placing the information in a table in a 'form'
import pyodbc
connection = pyodbc.connect(MY STRING)
cur = connection.cursor()
cur.execute("select top(10) May07Control.seq, May07Control.member from dbo.May07Control")
for row in cur:
print "member: %s"% row.member
print "seq: %s"% row.seq
##OR the one-line way
cur.execute("select May07Control.seq, May07Control.member from dbo.May07Control")
resultList = [(row.member, row.seq) for row in cur]
So if you're running Python through IDLE and you're aiming at a browser view/interface. The next step is to get a development server running on your local machine. All the template engines come with cookbook instructions on how to do this. Bottle is a very simple example.
I personally use the development servers that come with Google App Engine, and PyDev in Eclipse, and you could potentially use the included Python server.
If you need data-driven presentation in a browser, I (and a lot of other people) would strongly suggest Django http://www.djangoproject.com/.
Related
I am building a web application in Flask.
We have opened up the database window of PyCharm and established a data source to a SQL server database.
My question is what does establishing a data source do?
Does is remove the need to connect to a database manually?, like for example
db = MySQLdb.connect("localhost","testuser","test123","TESTDB" )
If the answer is yes it does remove the need to set
updb = MySQLdb.connect("localhost","testuser","test123","TESTDB" )
then how can you access the data in the database, and establish a cursor object?
The JetBrains IDEs such as PyCharm or IntelliJ have a database browser, basically productionalized as it's own IDE called DataGrip, but that's besides the point.
Fact is, no, that doesn't replace the need for code, and you could have zero code and make a database connection, or entirely code and never touch the database window, ever (because you don't need PyCharm to write said code).
So, they are separate things, just like how "SQL Server" means something completely different from "MySQL" (e.g. you might need a different library)
I'm relatively new to databases, so this question may have a simple answer (I've been searching for hours).
I want to write a Python script that pulls the SQL Code stored in SQL Server Management Studio. I can successfully connect to the database using pyodbc and run queries against the database tables, but I would like to be able to pull, for example, the SQL code stored in a procedure, function, view, etc. without running it.
This seems like something that would be relatively simple. I know it can be done in Powershell, but I would prefer to use Python. Is there some sort of module or pyodbc hack that will do this?
You can use the sp_helptext command in SQL Server, which will give you the SQL Server object source code line by line:
stored_proc_text = ""
res = cursor.execute('sp_helptext my_stored_procedure')
for row in res:
stored_proc_text += row[0]
print(stored_proc_text)
Good luck!
I have a program, in which I have been using the phoenixdb package developed by Lukas Lalinsky but during the past few days it seems to have become very unstable. I think this is due to the size of the database (as it is constantly growing). By unstable I mean that around half my queries are failing with a runtime exception.
So I have moved on and tried to find a more stable way to connect with my Phoenix "server". Therefore I want to try out a JDBC connection. As far as I have understood Phoenix should have great integration with JDBC.
I do however have problems with understanding how to set up the initial connection.
I read the following Usage section of the JayDeBeApi package, but I don't know what the Driver Class is or where it is located? If I have to download it myself? How to set it up? And so forth.
I was hoping someone in here would know and hopefully explain it in detail.
Thanks!
EDIT:
I've managed to figure out that my connect statement should be something along this:
import jaybedeapi as jdbc
conn = jdbc.connect('org.apache.phoenix.jdbc.PhoenixDriver', ['jdbc:phoenix:<ip>:<port>:', '', ''], '<location-of-phoenix-client.jar>')
However I still don't know where to get my hands on that phoenix-client.jar file and how to reference to it.
I managed to find the solution after having set up a Java project and testing out JDBC in that development environment and getting a successful connection.
To get the JDBC connection working in Java I used the JDBC driver found in the Phoenix distribution from Apache here. I used the driver that matched my Phoenix and HBase versions - phoenix-4.9.0-HBase-1.2-client.jar
Once that setup was completed and I could connect to Phoenix using Java I started trying to set it up using Python. I started a connection to Phoenix with the following:
import jaydebeapi as jdbc
import os
cwd = os.getcwd()
jar = cwd + '/phoenix-4.9.0-HBase-1.2-client.jar'
drivername = 'org.apache.phoenix.jdbc.PhoenixDriver'
url = 'jdbc:phoenix:<ip>:<port>/'
conn = jdbc.connect(drivername, url, jar)
Now I had a successful connection through JDBC to Phoenix using Python. Hope someone else out there can use this question in the future.
I created a cursor using the following and could issue commands like in the following:
cursor = conn.cursor()
sql = """SELECT ...."""
cursor.execute(sql)
resp = cursor.fetchone() # could use .fetchall() or .fetchmany() if needed
I hope this helps someone out there!
I have an online database and connect to it by using MySQLdb.
db = MySQLdb.connect(......)
cur = db.cursor()
cur.execute("SELECT * FROM YOUR_TABLE_NAME")
data = cur.fetchall()
Now, I want to write the whole database to my localhost (overwrite). Is there any way to do this?
Thanks
If I'm reading you correctly, you have two database servers, A and B (where A is a remote server and B is running on your local machine) and you want to copy a database from server A to server B?
In all honesty, if this is a one-off, consider using the mysqldump command-line tool, either directly or calling it from python.
If not, the last answer on http://bytes.com/topic/python/answers/24635-dump-table-data-mysqldb details the SQL needed to define a procedure to output tables and data, though this may well miss subtleties mysqldump does not
I'm having issues making multiple ajax POST calls to functions that access a database in my web app using sqlite and mod-wsgi. I have no issues making requests to one function, but as soon as I call a different function, I started getting "database is locked" errors. I've tried setting the variables as global and just accessing them in the two functions, as well as opening and closing the database in each function, to no avail.
What's the proper way to interface with a database if you just have one application function in your code? Threads? Persistent connections?
I've used Django before, but wanted something bare-bone for this simple app running on my local machine.
The relevant section of code is:
con = sqlite3.connect("/var/www/Knowledge/eurisko.sqlite")
con.row_factory = sqlite3.Row
cursor = con.cursor()
cursor.execute("update notes_content set c1content=?, c2timestamp=?
where c0title=?", [content, timestamp, title])
con.commit()
cursor.close()
con.close()
The full file is here: http://pastebin.com/7yuiZFi2
I'm running apache 2.2 on ubuntu 10 with libapache2-modwsgi and python
2.7.
See warnings about concurrent access from multiple processes in SQLite documentation.
http://www.sqlite.org/faq.html#q5
This information was provided on mod_wsgi list where question was also asked, but following up here.
This can be an issue because Apache/mod_wsgi supports both single and multi process configurations. Likely OP is using multi process configuration. Also see:
http://code.google.com/p/modwsgi/wiki/ProcessesAndThreading
for description of Apache/mod_wsgi process/threading model.