DbApiCheatSheet¶

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Some quick syntax reminders for common tasks using DB-API2 modules.

task postgresql sqlite MySQL Oracle ODBC oursql

create database createdb mydb created automatically when opened with sqlite3 created with Oracle XE install

command-line tool psql -d mydb sqlite3 mydb.sqlite mysql testdb sqlplus scott/tiger

GUI tool pgadmin3 mysql-admin sqldeveloper

install module easy_install psycopg2 included in Python 2.5 standard library easy_install mysql-python or apt-get install python-mysqldb easy_install cx_oracle (but see note)

import from psycopg2 import * from sqlite3 import * from MySQLdb import * from cx_Oracle import *

connect conn = connect(“dbname=’testdb’ user=’me’ host=’localhost’ password=’mypassword’”) conn = connect(‘mydb.sqlite’) or conn=connect(‘:memory:’) conn = connect (host=”localhost”, db=”testdb”, user=”me”, passwd=”mypassword”) conn=connect(‘scott/tiger@xe’) conn = odbc.odbc(‘DBALIAS’) or odbc.odbc(‘DBALIAS/USERNAME/PASSWORD’)

get cursor curs = conn.cursor() curs = conn.cursor() curs = conn.cursor() curs = conn.cursor()

execute SELECT curs.execute(‘SELECT * FROM tbl’) curs.execute(‘SELECT * FROM tbl’) curs.execute(‘SELECT * FROM tbl’) curs.execute(‘SELECT * FROM tbl’)

fetch curs.fetchone(); curs.fetchall(); curs.fetchmany() curs.fetchone(); curs.fetchall(); curs.fetchmany() curs.fetchone(); curs.fetchall(); curs.fetchmany() curs.fetchone(); curs.fetchall(); curs.fetchmany(); for r in curs

use bind variables curs.execute(‘SELECT * FROM tbl WHERE col = %(varnm)s’, {‘varnm’:22}) curs.execute(‘SELECT * FROM tbl WHERE col = ?’, [22]) curs.execute(‘SELECT * FROM tbl WHERE col = %s’, [22]) curs.execute(‘SELECT * FROM tbl WHERE col = :varnm’, {‘varnm’:22}) curs.execute(‘SELECT * FROM tbl WHERE col = ?’, (22,))

DbApiCheatSheet¶

commit conn.commit() (required) conn.commit() (required) conn.commit() (required) conn.commit() (required)¶