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sqlite3 - connect, create, insert, select
Python and SQL databases example from a Well House Consultants training course
More on Python and SQL databases [link]
Source code: databases_python Module: Y113
import sqlite3
import sys # Create an example database and table ... timespend=2 if len(sys.argv) > 1: if sys.argv[1] == "seed": conn = sqlite3.connect('mysample.db') # name of the file to hold the database c = conn.cursor() c.execute("CREATE TABLE course (cid int, name text, days int)") c.execute('INSERT INTO course VALUES(1,"Python Programming",3)') c.execute('INSERT INTO course VALUES(2,"Intermediate Python",3)') c.execute('INSERT INTO course VALUES(3,"Feeding your Python",2)') conn.commit() c = conn.cursor() c.execute("CREATE TABLE endday (eid int, dayname text)") c.execute('INSERT INTO endday VALUES(1,"Monday")') c.execute('INSERT INTO endday VALUES(2,"Tuesday")') c.execute('INSERT INTO endday VALUES(3,"Wednesday")') c.execute('INSERT INTO endday VALUES(4,"Thursday")') c.execute('INSERT INTO endday VALUES(5,"Friday")') conn.commit() else: timespend = int(sys.argv[1]) # Then - (default use) use the data conn = sqlite3.connect('mysample.db') # name of the file to hold the database c = conn.cursor() print "Sample select using a program generated query" rows = 0 gimme = c.execute("SELECT name, days FROM course WHERE days > " + str(timespend)) for gotme in gimme: print gotme rows += 1 print "Total of",rows,"records selected" print "Sample select using a join of 2 tables" rows = 0 gimme = c.execute("SELECT name, days FROM course WHERE days > " + str(timespend)) gimme = c.execute("SELECT * FROM course JOIN endday ON days = eid") for gotme in gimme: print gotme rows += 1 print "Total of",rows,"records selected" """ Samples of that running: Accessing the tables when they don't exist (error condition test) munchkin:pf13 grahamellis$ python databases_python Sample select using a program generated query Traceback (most recent call last): File "databases_python", line 38, in <module> gimme = c.execute("SELECT name, days FROM course WHERE days > " + str(timespend)) sqlite3.OperationalError: no such table: course Seeding the tables and reporting on what was added munchkin:pf13 grahamellis$ python databases_python seed Sample select using a program generated query (u'Python Programming', 3) (u'Intermediate Python', 3) Total of 2 records selected Sample select using a join of 2 tables (1, u'Python Programming', 3, 3, u'Wednesday') (2, u'Intermediate Python', 3, 3, u'Wednesday') (3, u'Feeding your Python', 2, 2, u'Tuesday') Total of 3 records selected Accessing the tables - courses of longer than one day munchkin:pf13 grahamellis$ python databases_python 1 Sample select using a program generated query (u'Python Programming', 3) (u'Intermediate Python', 3) (u'Feeding your Python', 2) Total of 3 records selected Sample select using a join of 2 tables (1, u'Python Programming', 3, 3, u'Wednesday') (2, u'Intermediate Python', 3, 3, u'Wednesday') (3, u'Feeding your Python', 2, 2, u'Tuesday') Total of 3 records selected Accessing the tables - courses of longer than three daya munchkin:pf13 grahamellis$ python databases_python 3 Sample select using a program generated query Total of 0 records selected Sample select using a join of 2 tables (1, u'Python Programming', 3, 3, u'Wednesday') (2, u'Intermediate Python', 3, 3, u'Wednesday') (3, u'Feeding your Python', 2, 2, u'Tuesday') Total of 3 records selected Accessing the tables - courses of longer than two daya munchkin:pf13 grahamellis$ python databases_python 2 Sample select using a program generated query (u'Python Programming', 3) (u'Intermediate Python', 3) Total of 2 records selected Sample select using a join of 2 tables (1, u'Python Programming', 3, 3, u'Wednesday') (2, u'Intermediate Python', 3, 3, u'Wednesday') (3, u'Feeding your Python', 2, 2, u'Tuesday') Total of 3 records selected Try creating tables that already exist - ensuring error is generated munchkin:pf13 grahamellis$ python databases_python seed Traceback (most recent call last): File "databases_python", line 14, in <module> c.execute("CREATE TABLE course (cid int, name text, days int)") sqlite3.OperationalError: table course already exists munchkin:pf13 grahamellis$ """ Learn about this subject
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