MySQL Connector/Python——操作mysql

———————————————python3.3_connector1.1.4_windows—————————————————————

首先在http://dev.mysql.com/downloads/connector/python/下载connector/python，然后直接点击安装包进行安装，如果安装python的时候选择的是只为自己安装这个选项，那么就会出现在安装connector/python的时候提示说找不到python3.3...

1、连接mysql

import mysql.connector
cnx=mysql.connector.connect(user='root',password='',host='127.0.0.1',database='lazystudy')
cnx.close()

2、创建表和创建数据库

from mysql.connector import errorcode
import mysql.connector
from symbol import except_clause

DB_NAME='lazystudy'
TABLES={}

TABLES['Book']="""
    create table book(
        id int(11) auto_increment primary key,
        bookname varchar(20) not null,
        price int(11) not null
    )
"""

TABLES['People']="""
    create table people(
        id int(11) auto_increment primary key,
        name varchar(20) not null
    )
"""

cnx=mysql.connector.connect(user='root',password='',host='127.0.0.1')

cursor=cnx.cursor()

def create_database(cursor):
    try:
        cursor.execute("create database {} default character set 'utf-8'".format(DB_NAME))
    except mysql.connector.Error as err:
        print('failed creating database:{}'.format(DB_NAME))
        exit(1)

try:
    cnx.database=DB_NAME
except mysql.connector.Error as err:
    if(err.errno==errorcode.ER_BAD_DB_ERROR):
        create_database(cursor)
        cnx.database=DB_NAME
    else:
        print(err)
        exit(1)


for name,ddl in TABLES.items():
    try:
        print('creating table {}'.format(name),end=' ')
        cursor.execute(ddl)
    except mysql.connector.Error as err:
        if(err.errno==errorcode.ER_TABLE_EXISTS_ERROR):
            print("already exits...")
        else:
            print(err.msg)
    else:
        print("successfully...")


cursor.close()
cnx.close()

3、插入数据

"""
insert into db
"""
import mysql.connector
cnx=mysql.connector.connect(user='root',password='',database='lazystudy',host='127.0.0.1')
cursor=cnx.cursor()

add_book="""
    insert into book (bookname,price) values(%s,%s)
"""
data_book=('the one',100)

add_people="""
    insert into people (name) values(%s)
"""
data_people=('lazy',)#记得加上','  ——不然会出错...这是python元组的特性..。

#insert...
cursor.execute(add_book,data_book)
cursor.execute(add_people,data_people)

#close
cnx.commit()
cursor.close()
cnx.close()

 4、查询数据

import mysql.connector
cnx=mysql.connector.connect(user='root',password='',database='lazystudy')
cursor=cnx.cursor()
query="""
    select * from people where id between %s and %s
"""
query_limit=(1,3)
cursor.execute(query,query_limit)

for info in cursor:
    print("name:{}".format(info[1]))

cursor.close()
cnx.close()

 5、在django中的配置

DATABASES = {
    'default': {
        'NAME': 'lazystudy',
        'ENGINE': 'mysql.connector.django',
        'USER': 'root',
        'PASSWORD': '',
        'OPTIONS': {
          'autocommit': True,
        },
    }
}