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| ================== ==================================================================================== ========================================================= =========================================================== ================================================================== ====================================================================== task postgresql sqlite MySQL Oracle ODBC ================== ==================================================================================== ========================================================= =========================================================== ================================================================== ====================================================================== create database createdb mydb created automatically when opened with sqlite3 created with Oracle XE install ------------------ ------------------------------------------------------------------------------------ --------------------------------------------------------- ----------------------------------------------------------- ------------------------------------------------------------------ ---------------------------------------------------------------------- command-line tool psql -d mydb sqlite3 mydb.sqlite sqlplus scott/tiger@orcl ------------------ ------------------------------------------------------------------------------------ --------------------------------------------------------- ----------------------------------------------------------- ------------------------------------------------------------------ ---------------------------------------------------------------------- GUI tool pgadmin3 mysql-admin ------------------ ------------------------------------------------------------------------------------ --------------------------------------------------------- ----------------------------------------------------------- ------------------------------------------------------------------ ---------------------------------------------------------------------- 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 ------------------ ------------------------------------------------------------------------------------ --------------------------------------------------------- ----------------------------------------------------------- ------------------------------------------------------------------ ---------------------------------------------------------------------- import from psycopg2 import * from sqlite3 import * from MySQLdb import * ------------------ ------------------------------------------------------------------------------------ --------------------------------------------------------- ----------------------------------------------------------- ------------------------------------------------------------------ ---------------------------------------------------------------------- connect conn = connect("dbname='testdb' user='me' host='localhost' password='mypassword'”) conn = connect('mydb.sqlite') or conn=connect(':memory:') conn=connect('scott/tiger@orcl') conn = odbc.odbc('DBALIAS') or odbc.odbc('DBALIAS/USERNAME/PASSWORD') ------------------ ------------------------------------------------------------------------------------ --------------------------------------------------------- ----------------------------------------------------------- ------------------------------------------------------------------ ---------------------------------------------------------------------- get 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') ------------------ ------------------------------------------------------------------------------------ --------------------------------------------------------- ----------------------------------------------------------- ------------------------------------------------------------------ ---------------------------------------------------------------------- fetch curs.fetchone(); curs.fetchall(); curs.fetchmany() curs.fetchone(); curs.fetchall(); curs.fetchmany() curs.fetchone(); curs.fetchall(); curs.fetchmany() ------------------ ------------------------------------------------------------------------------------ --------------------------------------------------------- ----------------------------------------------------------- ------------------------------------------------------------------ ---------------------------------------------------------------------- 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}) ------------------ ------------------------------------------------------------------------------------ --------------------------------------------------------- ----------------------------------------------------------- ------------------------------------------------------------------ ---------------------------------------------------------------------- commit conn.commit() (required) conn.commit() (required) conn.commit() (required) ------------------ ------------------------------------------------------------------------------------ --------------------------------------------------------- ----------------------------------------------------------- ------------------------------------------------------------------ ---------------------------------------------------------------------- |
================== ==================================================================================== task postgresql ================== ==================================================================================== create database createdb mydb ------------------ ------------------------------------------------------------------------------------ command-line tool psql -d mydb ------------------ ------------------------------------------------------------------------------------ GUI tool pgadmin3 ------------------ ------------------------------------------------------------------------------------ install module easy_install psycopg2 ------------------ ------------------------------------------------------------------------------------ import from psycopg2 import * ------------------ ------------------------------------------------------------------------------------ connect conn = connect("dbname='testdb' user='me' host='localhost' password='mypassword'”) ------------------ ------------------------------------------------------------------------------------ get cursor curs = conn.cursor() ------------------ ------------------------------------------------------------------------------------ execute SELECT curs.execute('SELECT * FROM tbl') ------------------ ------------------------------------------------------------------------------------ fetch curs.fetchone(); curs.fetchall(); curs.fetchmany() ------------------ ------------------------------------------------------------------------------------ use bind variables curs.execute('SELECT * FROM tbl WHERE col = %(varnm)s', {'varnm':22}) ------------------ ------------------------------------------------------------------------------------ commit conn.commit() (required) ------------------ ------------------------------------------------------------------------------------ |
================== ====================================================================================
- task postgresql
================== ====================================================================================
- create database createdb mydb
- command-line tool psql -d mydb
- GUI tool pgadmin3
- install module easy_install psycopg2
- import from psycopg2 import *
- connect conn = connect("dbname='testdb' user='me' host='localhost' password='mypassword'”)
- get cursor curs = conn.cursor()
- execute SELECT curs.execute('SELECT * FROM tbl')
- fetch curs.fetchone(); curs.fetchall(); curs.fetchmany()
use bind variables curs.execute('SELECT * FROM tbl WHERE col = %(varnm)s', {'varnm':22})
- commit conn.commit() (required)