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MySQL在cmd和python下的常用操作

环境配置1:安装mysql,环境变量添加mysql的bin目录

环境配置2:python安装MySQL-Python

  请根据自身操作系统下载安装,否则会报c ++ compile 9.0,import _mysql等错误

  windows10 64位操作系统可到 http://www.lfd.uci.edu/~gohlke/pythonlibs/  下载安装MySQL-Python包,至于whl和tar.gz在windows和Linux下的安装方法可查看我的上一篇文章

一 、cmd命令下的操作:

  连接mysql:mysql -u root -p

  查看所有数据库:show databases;

  创建test数据库:create database test;

  删除数据库:drop database test;

  使用(切换至)test数据库:use test;

  查看当前数据库下的表:show tables;

  创建UserInfo表:create table UserInfo(id int(5) NOT NULL auto_increment,username varchar(10),password varchar(20) NOT NULL,PRIMARY KEY(id));

  删除表:drop table UserInfo;

  判断数据是否存在:select * from UserInfo where name like ‘elijahxb‘;

  增数据:insert into UserInfo(username,password) value(‘eljiahxb‘,‘123456‘);

      

  查数据:select * from UserInfo;     select id from UserInfo;     select username from UserInfo;

  改数据:update UserInfo set username = ‘Zus‘ where id=1;    update UserInfo set username=‘Zus‘;

  删数据:delete from UserInfo;    delete from UserInfo where id=1;

  断开连接:quit

二、python下的操作:

  

技术分享
 1 # -*- coding: utf-8 -*-
 2 #!/usr/bin/env python
 3 
 4 # @Time    : 2017/6/4 18:11
 5 # @Author  : Elijah
 6 # @Site    : 
 7 # @File    : sql_helper.py
 8 # @Software: PyCharm Community Edition
 9 import MySQLdb
10 
11 class MySqlHelper(object):
12     def __init__(self,**args):
13         self.ip = args.get("IP")
14         self.user = args.get("User")
15         self.password = args.get("Password")
16         self.tablename = args.get("Table")
17         self.port = 3306
18         self.conn = self.conn = MySQLdb.Connect(host=self.ip,user=self.user,passwd=self.password,port=self.port,connect_timeout=5,autocommit=True)
19         self.cursor = self.conn.cursor()
20 
21     def Close(self):
22         self.cursor.close()
23         self.conn.close()
24     def execute(self,sqlcmd):
25         return self.cursor.execute(sqlcmd)
26     def SetDatabase(self,database):
27         return self.cursor.execute("use %s;"%database)
28     def GetDatabasesCount(self):
29         return self.cursor.execute("show databases;")
30     def GetTablesCount(self):
31         return self.cursor.execute("show tables;")
32     def GetFetchone(self, table = None):
33         if not table:
34             table = self.tablename
35         self.cursor.execute("select * from %s;"%table)
36         return self.cursor.fetchone()
37     def GetFetchmany(self,table=None,size=0):
38         if not table:
39             table = self.tablename
40         count = self.cursor.execute("select * from %s;"%table)
41         return self.cursor.fetchmany(size)
42     def GetFetchall(self,table=None):
43         ‘‘‘
44         :param table: 列表
45         :return:
46         ‘‘‘
47         if not table:
48             table = self.tablename
49         self.cursor.execute("select * from %s;"%table)
50         return self.cursor.fetchall()
51     def SetInsertdata(self,table=None,keyinfo=None,value=http://www.mamicode.com/None):
52         """
53         :param table:
54         :param keyinfo:可以不传此参数,但此时value每一条数据的字段数必须与数据库中的字段数一致。
55                         传此参数时,则表示只穿指定字段的字段值。
56         :param value:类型必须为只有一组信息的元组,或者包含多条信息的元组组成的列表
57         :return:
58         """
59         if not table:
60             table = self.tablename
61         slist = []
62         if type(value)==tuple:
63             valuelen = value
64             execmany = False
65         else:
66             valuelen = value[0]
67             execmany = True
68         for each in range(len(valuelen)):
69             slist.append("%s")
70         valuecenter = ",".join(slist)
71         if not keyinfo:
72             sqlcmd = "insert into %s values(%s);"%(table,valuecenter)
73         else:
74             sqlcmd = "insert into %s%s values(%s);" % (table,keyinfo,valuecenter)
75         print(sqlcmd)
76         print(value)
77         if execmany:
78             return self.cursor.executemany(sqlcmd,value)
79         else:
80             return self.cursor.execute(sqlcmd, value)
MySqlHelper

 

MySQL在cmd和python下的常用操作