Python. Data bases. Marcin Młotkowski. 8th May, 2013

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1 Data bases 8th May, 2013

2 1 DBM databases 2 3

3 Types of data storage Trwałe słowniki Klient-serwer SQL Bekreley DB Gnu dbm (n)dbm Firebird Sqlite Oracle MySQL PostgeSQL DB/2

4 DBM databases Database manager Data is stored in file being a hashtable Values are accessed by keys Usually, value can be only of type string Implementation: standard hash tables and b-trees No server, all in one file Fast!!!

5 How to use DBM db[ jeden ] = one db[ dwa ] = two if trzy in db: del db[ trzy ]

6 How to use DBM import <modul> db = <modul>.open( storage.dbm, c ) db[ jeden ] = one db[ dwa ] = two if trzy in db: del db[ trzy ] db.close()

7 Available modules 2.* 3.* Description dumbdb dbm.dumb slow, but pure implementation bsddb (dbhash) implementation of Berkeley DB dbm dbm.ndbm API to U*X (n)dbm gdbm dbm.gnu extension of dbm

8 How to process entire collection for key in db.keys(): print db[key]

9 How to process entire collection for key in db.keys(): print db[key] Warning All file must be kept in memory.

10 Collection processing, dumbdbm for key in db: print db[, key, ] =, db[key] db.close()

11 Collection processing dbhash print db.first() while True: try: el = db.next() print el except KeyError: break gdbm k = db.firstkey() while k!= None: print k k = db.nextkey(k)

12 Available modules for in firstkey(), nextkey() first(), next() dumbdbm X (n)dbm gdbm X dbhash X

13 how to deal with this mess Use generic package anydbm

14 how to deal with this mess Use generic package anydbm Use package whichdbm: >>> import anydbm >>> whichdb.whichdb( plik.db )

15 Berkeley DB Who use Berkeley DB? OpenLDAP, Subversion, Spamassasin, KDevelop,... Features: transactions; replication; record locking; keys: positive integers.

16 How to store object? shelve package Shelve file is a dictionary, i.e. list of pairs (string, object)

17 shelve package Example import shelve db = shelve.open( dane.db ) db[ a_list ] = [2,3,5,7,11] db.sync() del db[ an_object ] db.close()

18 Database engines Oracle DB/2 MySQL PostgreSQL MSSQL...

19 DB API DBM databases Database API Specification A unified API (methods and fields) to different database engines. Current version: 2.0.

20 Opening connection to database connect( parameters ) # returns an object Connection

21 Opening connection to database connect( parameters ) MySQL # returns an object Connection import MySQLdb db = MySQLdb.connect(host= localhost, db= testing, user= user, passwd= )

22 Closing connection db.close()

23 Communication with database send a query wynik = db.cursor() wynik.execute( SELECT * FROM Students )

24 Communication with database send a query wynik = db.cursor() wynik.execute( SELECT * FROM Students ) Fetching a result row = wynik.fetchone() while row: print row row = wynik.fetchone() Optional wynik.close()

25 A result DBM databases Result attributes (an object of the class Cursor): description: describes columns rowcount: number of returned or processed (e.g. INSERT or UPDATE)rows...

26 DB API - additional information Standard exceptions: Warning, DatabaseError, NotSupportedError,...

27 SQLite DBM databases File database, no external server, no contact with admin; module: sqlite3 Implements DB API 2.0 with extensions

28 Sqlite usage Table creation import sqlite3 db = sqlite.connect( /tmp/temp.db ) kursor = db.cursor() kursor.execute( create table Library (Author text, Title text, publish_year int, price real) ) kursor.commit()

29 Sqlite usage Insert row into table kursor.execute( insert into Library values ( Shakespeare, Hamlet, 2003, 25.5) )

30 Sqlite usage Fetching data (extension of DB API 2.0) kursor.execute( SELECT * FROM Library ) for row in kursor: print row

31 Sqlite DBM databases Curiosity db = sqlite.connect( :memory: )

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