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← Revision 15 as of 2010-03-09 03:54:30 ⇥
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| ================== ==================================================================================== 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) ================== ==================================================================================== |
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,)) ------------------ ------------------------------------------------------------------------------------ --------------------------------------------------------- ------------------------------------------------------------------------------ ------------------------------------------------------------------ ---------------------------------------------------------------------- ------------------------------------------------------ commit conn.commit() (required) conn.commit() (required) conn.commit() (required) conn.commit() (required) ================== ==================================================================================== ========================================================= ============================================================================== ================================================================== ====================================================================== ====================================================== .. _note: http://catherinedevlin.blogspot.com/2007/10/cxoracle-and-oracle-xe-on-ubuntu.html See also DbApiModuleComparison_, DatabaseProgramming_ .. _DbApiModuleComparison: DbApiModuleComparison .. _DatabaseProgramming: DatabaseProgramming |
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,)) | |
| commit | conn.commit() (required) | conn.commit() (required) | conn.commit() (required) | conn.commit() (required) |
See also DbApiModuleComparison, DatabaseProgramming