标签：python   python脚本   数据库   sqlite3   database   

一 数据库设计

【category】
id int,sort int,name text


【book】
id int,sort int,name text,price real,category int

二 创建数据库

import sqlite3


# data.db is a db file in the working directory.
conn = sqlite3.connect("data.db")


c = conn.cursor()


# create tables
c.execute("'CREATE TABLE category
      (id int primary key, 
       sort int, 
       name text)'")
c.execute("'CREATE TABLE book
      (id int primary key, 
       sort int, 
       name text, 
       price real, 
       category int,
       FOREIGN KEY (category) REFERENCES category(id))'")


# save the changes
conn.commit()


# close the connection with the database
conn.close()

三 插入数据

import sqlite3


conn = sqlite3.connect("data.db")
c = conn.cursor()


books = [(1, 1, 'Cook Recipe', 3.12, 1),
         (2, 3, 'Python Intro', 17.5, 2),
         (3, 2, 'OS Intro', 13.6, 2),
        ]


# execute "INSERT" 
c.execute("INSERT INTO category VALUES (1, 1, 'kitchen')")


# using the placeholder
c.execute("INSERT INTO category VALUES (?, ?, ?)", [(2, 2, 'computer')])


# execute multiple commands
c.executemany('INSERT INTO book VALUES (?, ?, ?, ?, ?)', books)


conn.commit()
conn.close()

四 查询

import sqlite3


conn = sqlite3.connect('test.db')
c = conn.cursor()


# retrieve one record
c.execute('SELECT name FROM category ORDER BY sort')
print(c.fetchone())
print(c.fetchone())


# retrieve all records as a list
c.execute('SELECT * FROM book WHERE book.category=1')
print(c.fetchall())


# iterate through the records
for row in c.execute('SELECT name, price FROM book ORDER BY sort'):
    print(row)

五 更新和删除记录

可以更新某个记录，或者删除记录：

import sqlite3


conn = sqlite3.connect("test.db")
c = conn.cursor()


c.execute('UPDATE book SET price=? WHERE id=?',(1000, 1))
c.execute('DELETE FROM book WHERE id=2')


conn.commit()
conn.close()

c.execute('DROP TABLE book')

Python学习笔记21：数据库操作(sqlite3)

标签：python   python脚本   数据库   sqlite3   database   

原文地址：http://blog.csdn.net/xufeng0991/article/details/40370443