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MySQL在cmd和python下的常用操作汇总分享

时间:2021-07-01 10:21:17 帮助过:64人阅读

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:

  

 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 MySQLdb10 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 = 330618         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.tablename35         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.tablename40         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.tablename49         self.cursor.execute("select * from %s;"%table)50         return self.cursor.fetchall()51     def SetInsertdata(self,table=None,keyinfo=None,value=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.tablename61         slist = []62         if type(value)==tuple:63             valuelen = value64             execmany = False65         else:66             valuelen = value[0]67             execmany = True68         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

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