浅谈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:
# -*- coding: utf-8 -*- #!/usr/bin/env python # @Time : 2017/6/4 18:11 # @Author : Elijah # @Site : # @File : sql_helper.py # @Software: PyCharm Community Edition import MySQLdb class MySqlHelper(object): def __init__(self,**args): self.ip = args.get("IP") self.user = args.get("User") self.password = args.get("Password") self.tablename = args.get("Table") self.port = 3306 self.conn = self.conn = MySQLdb.Connect(host=self.ip,user=self.user,passwd=self.password,port=self.port,connect_timeout=5,autocommit=True) self.cursor = self.conn.cursor() def Close(self): self.cursor.close() self.conn.close() def execute(self,sqlcmd): return self.cursor.execute(sqlcmd) def SetDatabase(self,database): return self.cursor.execute("use %s;"%database) def GetDatabasesCount(self): return self.cursor.execute("show databases;") def GetTablesCount(self): return self.cursor.execute("show tables;") def GetFetchone(self, table = None): if not table: table = self.tablename self.cursor.execute("select * from %s;"%table) return self.cursor.fetchone() def GetFetchmany(self,table=None,size=0): if not table: table = self.tablename count = self.cursor.execute("select * from %s;"%table) return self.cursor.fetchmany(size) def GetFetchall(self,table=None): ''' :param table: 列表 :return: ''' if not table: table = self.tablename self.cursor.execute("select * from %s;"%table) return self.cursor.fetchall() def SetInsertdata(self,table=None,keyinfo=None,value=None): """ :param table: :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。 传此参数时,则表示只穿指定字段的字段值。 :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 :return: """ if not table: table = self.tablename slist = [] if type(value)==tuple: valuelen = value execmany = False else: valuelen = value[0] execmany = True for each in range(len(valuelen)): slist.append("%s") valuecenter = ",".join(slist) if not keyinfo: sqlcmd = "insert into %s values(%s);"%(table,valuecenter) else: sqlcmd = "insert into %s%s values(%s);" % (table,keyinfo,valuecenter) print(sqlcmd) print(value) if execmany: return self.cursor.executemany(sqlcmd,value) else: return self.cursor.execute(sqlcmd, value)
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