Python数据库API 提供了一种标准机制，可以针各种各样的数据库管理系统，包括SQLite。不管使用什么后台数据库，代码所遵循的过程都是一样的：连接 -> 创建游标 -> 交互（利用游标，使用SQL管理数据）->提交/回滚 ->关闭

#导入你需要的库
import sqlite3
#1、建立与数据库的连接
connection=sqlite3.connect('test.db');
#2、创建数据游标
cursor=connection.cursor()
#3、执行一些SQL操作
cursor.execute("""select date('NOW')""")
print(cursor.fetchone())
#4、提交所做的修改，使修改永久保留
connection.commit()
#5、完成时关闭链接
connection.close()

import sqlite3db='test.sqlite'    #数据库名
drop_table_sql="drop table if exists books;"
create_table_sql="""
create table books(id integer primary key autoincrement unique not null,name text not null,price integer,publish_date date not null
);
"""connection=sqlite3.connect(db)
cursor=connection.cursor()#创建数据库
cursor.execute(drop_table_sql)
cursor.execute(create_table_sql)#插入数据
insert_sql="insert into books (name,price,publish_date) values (?,?,?)"# ? 为占位符
cursor.execute(insert_sql,('java',123.23,'2012-12-03'))
cursor.execute(insert_sql,('C++',83.23,'2013-02-03'))
connection.commit()#查询
select_sql = "SELECT * FROM books"
cursor.execute(select_sql)
#返回一个list，list中的对象类型为tuple（元组）
data=cursor.fetchall()
for t in data:print(t)connection.close()

import mysql.connector
import sys, osuser = 'root'
pwd  = '123456'
host = '127.0.0.1'
db   = 'test'connection = mysql.connector.connect(user=user, password=pwd, host=host, database=db)
cursor = connection.cursor()#创建数据库表
drop_table_sql="drop table if exists person;"
create_table_sql = """
CREATE TABLE person(id int(10) AUTO_INCREMENT PRIMARY KEY,name varchar(20),age int(4)
)CHARACTER SET utf8;
"""
try:cursor.execute(drop_table_sql)cursor.execute(create_table_sql)
except mysql.connector.Error as err:print("create table 'mytable' failed.")print("Error: {}".format(err.msg))sys.exit()#插入数据
insert_sql = 'INSERT INTO person(name, age) VALUES (%s,%s)'
try:cursor.execute(insert_sql,('Jay', 22))cursor.execute(insert_sql,('Tony', 26))cursor.execute(insert_sql,('邵',24))
except mysql.connector.Error as err:print("insert table 'mytable' failed.")print("Error: {}".format(err.msg))sys.exit()#查询数据
select_sql = "SELECT * FROM person"
try:#cursor.execute() 返回 None; 执行SQL后的信息存储在cursor对象内。
    cursor.execute(select_sql)#获取一条记录,每条记录做为一个tuple(元组)返回data=cursor.fetchone()print(data)#获取2条记录，注意由于之前执行有了fetchone()，所以游标已经指到第二条记录了，也就是从第二条开始的2条记录data=cursor.fetchmany(2)print(data)cursor.execute(select_sql)#获取所有结果 data=cursor.fetchall()print(data)cursor.execute(select_sql)#获取所有结果for (id, name, age) in cursor:print("ID:{}  Name:{}  Age:{}".format(id, name, age))except mysql.connector.Error as err:print("query table 'mytable' failed.")print("Error: {}".format(err.msg))sys.exit()connection.commit()
cursor.close()
connection.close()