Python sqlite3

Jul 25, 20163 likes1,172 views

This document discusses using Python and SQLite3 to interact with a SQLite database. It shows how to connect to a database using sqlite3.connect(), get a cursor object using conn.cursor(), execute SQL statements like CREATE TABLE and INSERT using the cursor's execute method, and retrieve data using fetch methods. The goal is to demonstrate basic SQLite database operations in Python like creating tables, inserting data, and querying data.

Python
sqlite3
Алексей Бованенко
a.bovanenko@gmail.com

Python. sqlite3
● import sqlite3
● conn = sqlite3.connect('example.db')
○ connect(database[, timeout, isolation_level, detect_types, factory])
○ ":memory:"
● close(...)

Python. sqlite3
● c = conn.cursor()
○ cursor(...)
● c.execute(...)
● conn.commit()
● c.fetchall(...)
● c.fetchone(...)

Python. sqlite3
● c.execute('''CREATE TABLE data
(date text, trans text, symbol text, qty real, price real)''')
● c.execute("INSERT INTO data VALUES ('2016-01-05',
'BUY','RHAT',100,35.14)")
● for row in c.execute('SELECT * FROM data'):
print row

All data values in Python are encapsulated in relevant object classes. Everything in Python is an object and every object has an identity, a type, and a value. Like another object-oriented language such as Java or C++, there are several data types which are built into Python. Extension modules which are written in C, Java, or other languages can define additional types. To determine a variable's type in Python you can use the type() function. The value of some objects can be changed. Objects whose value can be changed are called mutable and objects whose value is unchangeable (once they are created) are called immutable.

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Python sqlite3

1. Python sqlite3 Алексей Бованенко [email protected]

2. Python. sqlite3 ● import sqlite3 ● conn = sqlite3.connect('example.db') ○ connect(database[, timeout, isolation_level, detect_types, factory]) ○ ":memory:" ● close(...)

3. Python. sqlite3 ● c = conn.cursor() ○ cursor(...) ● c.execute(...) ● conn.commit() ● c.fetchall(...) ● c.fetchone(...)

4. Python. sqlite3 ● c.execute('''CREATE TABLE data (date text, trans text, symbol text, qty real, price real)''') ● c.execute("INSERT INTO data VALUES ('2016-01-05', 'BUY','RHAT',100,35.14)") ● for row in c.execute('SELECT * FROM data'): print row

5. Спасибо за внимание Вопросы?

Python sqlite3

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