# By Vamei
import sqlite3

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

# By Vamei

import sqlite3

conn = sqlite3.connect("test.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 (""作为替代符号，并在后面的参数中给出具体值。这里不能用Python的格式化字符串，如"%s"，因为这一用法容易受到SQL注入攻击。

我也可以用executemany()的方法来执行多次插入，增加多个记录。每个记录是表中的一个元素，如上面的books表中的元素。
 查询
在执行查询语句后，Python将返回一个循环器，包含有查询获得的多个记录。你循环读取，也可以使用sqlite3提供的fetchone()和fetchall()方法读取记录：




# By Vamei

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)




更新与删除
你可以更新某个记录，或者删除记录：


# By Vamei

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

c.execute('UPDATE book SET price="htmlcode">

c.execute('DROP TABLE book')


如果删除test.db，那么整个数据库会被删除。
 总结
sqlite3只是一个SQLite的接口。想要熟练的使用SQLite数据库，还需要学习更多的关系型数据库的知识。


以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。