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 Editionimport MySQLdbclass 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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