杰晶网络

Python操作mysql数据库实现增删查改功能的方法
脚本专栏 2024/11/26 佚名
3 2

本文实例讲述了Python操作mysql数据库实现增删查改功能的方法。分享给大家供大家参考，具体如下：

#coding=utf-8
import MySQLdb
class Mysql_Oper:
  def __init__(self,host,user,passwd,db):
    self.host=host
    self.user=user
    self.passwd=passwd
    self.database=db
  def db_connecet(self):
    try:
      #连接
      conn=MySQLdb.connect(host=self.host,user=self.user,passwd=self.passwd,db=self.database,charset="utf8")
      cursor = conn.cursor()
    except MySQLdb.Error,e:
        print "Mysql Error %d: %s" % (e.args[0], e.args[1])
  def drop_table(self,table):
    try:
      #删除表
      sql = "drop table if exists" + table
      cursor.execute(sql)
    except MySQLdb.Error,e:
        print "Mysql Error %d: %s" % (e.args[0], e.args[1])
  def create_table(self,table):
    try:
      if table=="dept":
        #创建
        sql = "create table if not exists dept(deptno int primary key, dname varchar(50),loc varchar(50))"
        cursor.execute(sql)
      elif table=="emp":
        sql == "create table if not exists emp(empno INT PRIMARY KEY,ename VARCHAR(50),job VARCHAR(50),mgr INT,hiredate DATE,sal DECIMAL(7,2),COMM DECIMAL(7,2),deptno INT,loc varchar(50),CONSTRAINT fk_emp FOREIGN KEY(mgr) REFERENCES emp(empno))"
        cursor.execute(sql)
      elif table=="salgrade":
        sql = "create table if not exists salgrade(grade INT PRIMARY KEY,losal INT,hisal INT)"
        cursor.execute(sql)
      elif table=="stu":
        #创建
        sql = "create table if not exists dept(sid INT PRIMARY KEY,sname VARCHAR(50),age INT,gander VARCHAR(10),province VARCHAR(50),tuition INT)"
        cursor.execute(sql)
      else:
        print u"输入错误的表名，表明为dept、emp、salgrade、stu..."
    except MySQLdb.Error,e:
        print "Mysql Error %d: %s" % (e.args[0], e.args[1])
  def inser_onedata_table(self,table):
    try:
      if table=="dept":
        sql = "insert into dept values(%s,%s,%s)"
        param = (40, 'cai wu bu', 'wu han')
        n = cursor.execute(sql,param)
        print 'insert',n
      elif table=="emp":
        sql = "insert into emp values(%s,%s,%s,%s,%s,%s,%s,%s)"
        param = (1009, 'a niu', 'dong shi zhang', NULL, '2001-11-17', 50000, NULL, 10)
        n = cursor.execute(sql,param)
        print 'insert',n
      elif table=="salgrade":
        sql = "insert into salgrade values(%s,%s,%s)"
        param = (1, 7000, 12000)
        n = cursor.execute(sql,param)
        print 'insert',n
      elif table=="stu":
        sql = "insert into stu values(%s,%s,%s,%s,%s,%s)"
        param = ('1', '001', '23', 'nan', 'bei jing', '1500')
        n = cursor.execute(sql,param)
        print 'insert',n
      else:
        print u"输入错误的表名，表明为dept、emp、salgrade、stu..."
    except MySQLdb.Error,e:
        print "Mysql Error %d: %s" % (e.args[0], e.args[1])
  def inser_muldata_table(self,table):
    try:
      if table=="dept":
        sql = "insert into dept values(%s,%s,%s)"
        param = ((10, 'jiao yan bu', 'bei jing'),(20, 'xue gong bu', 'shang hai'),(30, 'xiao shou bu', 'guang zhou'))
        n = cursor.executemany(sql,param)
        print 'insert',n
      elif table=="emp":
        sql = "insert into emp values(%s,%s,%s,%s,%s,%s,%s,%s)"
        param = ((1004, 'liu bei', 'jing li', 1009, '2001-04-02', 29750, NULL, 20),
             (1006, 'guan yu', 'jing li', 1009, '2001-05-01', 28500, NULL, 30),
             (1008, 'zhu ge liang', 'fen xi shi', 1004, '2007-04-19', 30000, NULL, 20),
             (1013, 'pang', 'fen xi shi', 1004, '2001-12-03', 30000, NULL, 20),
             (1002, 'dai', 'xiao shou yuan', 1006, '2001-02-20', 16000, 3000, 30),
             (1003, 'tian zheng', 'xiao shou yuan', 1006, '2001-02-22', 12500, 5000, 30),
             (1005, 'xie xun', 'xiao shou yuan', 1006, '2001-09-28', 12500, 14000, 30),
             (1010, 'wei yi xiao', 'xiao shou yuan', 1006, '2001-09-08', 15000, 0, 30)
             )
        n = cursor.executemany(sql,param)
        print 'insert',n
      elif table=="salgrade":
        sql = "insert into salgrade values(%s,%s,%s)"
        param = ((2, 12010, 14000),(3, 14010, 20000),(4, 20010, 30000),(5, 30010, 99990))
        n = cursor.executemany(sql,param)
        print 'insert',n
      elif table=="stu":
        sql = "insert into stu values(%s,%s,%s,%s,%s,%s)"
        param = ( ('2', '002', '25', 'nan', 'liao ning', '2500'),
               ('3', '003', '22', 'nan', 'bei jing', '3500'),
               ('4', '004', '25', 'nan', 'bei jing', '1500'),
               ('5', '005', '23', 'nv', 'bei jing', '1000'),
               ('6', '006', '22', 'nv', 'shan dong', '2500'),
               ('7', '007', '21', 'nv', 'bei jing', '1600'),
               ('8', '008', '23', 'nan', 'bei jing', '3500'),
               ('9', '009', '23', 'nv', 'guang zhou', '2500'),
               ('10', '010', '18', 'nan', 'shan xi', '3500'),
               ('11', '011', '23', 'nan', 'hu bei', '4500'),
               ('12', '011', '24', 'nan', 'bei jing', '1500'),
               ('13', '011', '24', 'nan', 'liao ning', '2500'),
               ('14', '011', '22', 'nan', 'bei jing', '3500'),
               ('15', '011', '25', 'nan', 'bei jing', '1500'),
               ('16', '011', '23', 'nv', 'bei jing', '1000'),
               ('17', '011', '22', 'nv', 'shan dong', '2500'),
               ('18', '011', '21', 'nv', 'bei jing', '1600'),
               ('19', '011', '23', 'nan', 'bei jing', '3500'),
               ('20', '011', '23', 'nv', 'guang zhou', '2500'),
               ('21', '011', '18', 'nan', 'shan xi', '3500'),
               ('22', '011', '23', 'nan', 'hu bei', '4500'),
               ('23', '011', '23', 'nan', 'bei jing', '1500'),
               ('24', '011', '25', 'nan', 'liao ning', '2500'),
               ('25', '011', '22', 'nan', 'bei jing', '3500'),
               ('26', '011', '25', 'nan', 'bei jing', '1500'),
               ('27', '011', '23', 'nv', 'bei jing', '1000'),
               ('28', '011', '22', 'nv', 'shan dong', '2500'),
               ('29', '011', '21', 'nv', 'bei jing', '1600'),
               ('30', '011', '23', 'nan', 'bei jing', '3500'),
               ('31', '011', '23', 'nv', 'guang zhou', '2500'),
               ('32', '011', '18', 'nan', 'shan xi', '3500'),
               ('33', '033', '23', 'nan', 'hu bei', '4500'),
               ('34', '034', '23', 'nan', 'bei jing', '1500'),
               ('35', '035', '25', 'nan', 'liao ning', '2500'),
               ('36', '036', '22', 'nan', 'bei jing', '3500'),
               ('37', '037', '25', 'nan', 'bei jing', '1500'),
               ('38', '038', '23', 'nv', 'bei jing', '1000'),
               ('39', '039', '22', 'nv', 'shan dong', '2500'),
               ('40', '040', '21', 'nv', 'bei jing', '1600'),
               ('41', '041', '23', 'nan', 'bei jing', '3500'),
               ('42', '042', '23', 'nv', 'guang zhou', '2500'),
               ('43', '043', '18', 'nan', 'shan xi', '3500'),
               ('44', '044', '23', 'nan', 'hu bei', '4500'),
               ('45', '045', '23', 'nan', 'bei jing', '1500'),
               ('46', '046', '25', 'nan', 'liao ning', '2500'),
               ('47', '047', '22', 'nan', 'bei jing', '3500'),
               ('48', '048', '25', 'nan', 'bei jing', '1500'),
               ('49', '049', '23', 'nv', 'bei jing', '1000'),
               ('50', '050', '22', 'nv', 'shan dong', '2500'),
               ('51', '051', '21', 'nv', 'bei jing', '1600'),
               ('52', '052', '23', 'nan', 'bei jing', '3500'),
               ('53', '053', '23', 'nv', 'guang zhou', '2500'),
               ('54', '054', '18', 'nan', 'shan xi', '3500'),
               ('55', '055', '23', 'nan', 'hu bei', '4500')
            )
        n = cursor.executemany(sql,param)
        print 'insert',n
      else:
        print u"输入错误的表名，表明为dept、emp、salgrade、stu..."
    except MySQLdb.Error,e:
        print "Mysql Error %d: %s" % (e.args[0], e.args[1])
  def update_table(self,table,no,upno):
    try:
      if table=="dept":
        #创建
        sql = "update dept set deptno=%s where deptno=" +no
        param = (upno)
        n = cursor.execute(sql,param)
        print 'update',n
      elif table=="emp":
        sql = "update emp set empno=%s where empno=" +no
        param = (upno)
        n = cursor.execute(sql,param)
        print 'update',n
      elif table=="salgrade":
        sql = "update salgrade set grade=%s where grade=" +no
        param = (upno)
        n = cursor.execute(sql,param)
        print 'update',n
      elif table=="stu":
        sql = "update stu set sname=%s where sname=" +no
        param = (upno)
        n = cursor.execute(sql,param)
        print 'update',n
      else:
        print u"输入错误的表名，表明为dept、emp、salgrade、stu..."
    except MySQLdb.Error,e:
        print "Mysql Error %d: %s" % (e.args[0], e.args[1])
  def query_data(self,table):
    try:
      #查询
      sql="select * from "+table
      n = cursor.execute(sql)
      print cursor.fetchall()
      for row in cursor.fetchall():
        print row
        for r in row:
          print r
    except MySQLdb.Error,e:
        print "Mysql Error %d: %s" % (e.args[0], e.args[1])
  def delete_data(self,table,no)
    try:
      if table=="dept":
        sql = "delete from dept where deptno=%s"
        param = (upno)
        n = cursor.execute(sql,param)
        print 'delete',n
      elif table=="emp":
        sql = "delete from emp where empno=%s"
        param = (upno)
        n = cursor.execute(sql,param)
        print 'delete',n
      elif table=="salgrade":
        sql = "delete from salgrade where grade=%s"
        param = (upno)
        n = cursor.execute(sql,param)
        print 'delete',n
      elif table=="stu":
        sql = "delete from stu where sname=%s "
        param = (upno)
        n = cursor.execute(sql,param)
        print 'delete',n
      else:
        print u"输入错误的表名，表明为dept、emp、salgrade、stu..."
    except MySQLdb.Error,e:
        print "Mysql Error %d: %s" % (e.args[0], e.args[1])
  del down_db(self):
    try:
      cursor.close()
      #提交
      conn.commit()
      #关闭
      conn.close()
    except MySQLdb.Error,e:
        print "Mysql Error %d: %s" % (e.args[0], e.args[1])
mysqlDB=Mysql_Oper("127.0.0.1","root","root","exam")
mysqlDB.db_connecet()
mysqlDB.drop_table("dept")
for table in ["dept","emp","salgrade","stu"]
  mysqlDB.create_table(table)
  mysqlDB.inser_onedata_table(table)
  mysqlDB.inser_muldata_table(table)
  mysqlDB.query_data(table)
mysqlDB.down_db()

后期我会把数据整合到CSV文件中，操作CSV文件对数据进行操作

更多关于Python相关内容感兴趣的读者可查看本站专题：《Python+MySQL数据库程序设计入门教程》、《Python常见数据库操作技巧汇总》、《Python数学运算技巧总结》、《Python数据结构与算法教程》、《Python函数使用技巧总结》、《Python字符串操作技巧汇总》、《Python入门与进阶经典教程》及《Python文件与目录操作技巧汇总》

希望本文所述对大家Python程序设计有所帮助。

标签：
Python,mysql数据库,增删查改
免责声明：本站文章均来自网站采集或用户投稿，网站不提供任何软件下载或自行开发的软件！ 如有用户或公司发现本站内容信息存在侵权行为，请邮件告知！ 858582#qq.com
www.imxmx.com 杰晶网络
8,675无损音乐
1,324高清电影
213破解软件
120,141站长资源
一句话新闻
一口气升级7个大模型SaaS应用，百度智能云：突出一个“开箱即用” - 2024/11/26

这一波大模型产业落地浪潮里，不少企业其实处在 “干瞪眼“的状态。

一种情况是，很多大模型产品看得见却摸不着，在台上一个个遥遥领先——今天Sora技精四座，明天英伟达的机器人又赢得满堂彩，可是到了台下一问：啥时候能用上啊？答曰：遥遥无期。

另一种情况是，企业想用上大模型，却又难免瞻前顾后——既要考虑场景融合，又得兼顾安全性，还要考虑打通现有系统，再加上各种部署成本和繁琐的采购流程……最后只能拂袖：罢了，再等等吧。

稳了！魔兽国服回归的3条重磅消息！官宣时间再确认！

昨天有一位朋友在大神群里分享，自己亚服账号被封号之后居然弹出了国服的封号信息对话框。

这里面让他访问的是一个国服的战网网址，com.cn和后面的zh都非常明白地表明这就是国服战网。

而他在复制这个网址并且进行登录之后，确实是网易的网址，也就是我们熟悉的停服之后国服发布的暴雪游戏产品运营到期开放退款的说明。这是一件比较奇怪的事情，因为以前都没有出现这样的情况，现在突然提示跳转到国服战网的网址，是不是说明了简体中文客户端已经开始进行更新了呢？

更新动态

友情链接

杰晶网络 DDR爱好者之家 南强小屋 黑松山资源网 白云城资源网