MySQL在cmd和python下的常用操作解析

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)