The wxPython tutorial

Working with databaseshttp://www.zetcode.com/wxpython/databases/There are two ways for creating a connection object. We can create aconnection to a database on the filesystem. We simply specify thepath to the filename. We can also create a database in memory. Thisis done with a special string ':memory:'.We launch a python interpreter. We will test our examples there.$ pythonPython 2.5.1c1 (release25-maint, Apr 6 2007, 22:02:36)[GCC 4.1.2 (Ubuntu 4.1.2-0ubuntu4)] on linux2Type "help", "copyright", "credits" or "license" for more information.>>>>>> import sqlite3 as lite>>> con = lite.connect('people')>>> cur = con.cursor()>>> cur.execute('select name from neighbours')>>> print cur.fetchall()[(u'sandy',), (u'jane',), (u'mark',), (u'steven',), (u'alice',), (u'tom',), (u'jack',),>>> cur.close()>>> con.close()First we import the sqlite3 module. Then we connect to our peopledatabase. The database file is in our current directory. To create acursor object, we call the cursor() method of the connection object.After that we call two cursor object methods. The execute() methodexecutes SQL commands. The fetchall() method retrieves all datathat we have selected. The kosher way to end our work is to closethe cursor and the connection object.Commiting changesSQLite library works with transactions. It is important to understandhow it works. According to the documentation, for every DMLstatement, SQLite opens up a transaction. We must commit ourchanges to apply them. For every DCL statement, SQLite librarycommits automatically the changes. We will demonstrate this in shortexamples.>>> cur.execute("update neighbours set age=29 where name='lucy'")>>> cur.execute("select age from neighbours where name='lucy'")>>> print cur.fetchone()(29,)>>> cur.close()>>> con.close()>>> (CTRL + D)$ sqlite3 peoplesqlite> select age from neighbours where name='lucy';187 de 12 27/04/2008 1:06