南强小屋 Design By 杰米
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。
南强小屋 Design By 杰米
广告合作：本站广告合作请联系QQ：858582 申请时备注：广告合作（否则不回）
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
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
南强小屋 Design By 杰米
暂无Python操作mysql数据库实现增删查改功能的方法的评论...
RTX 5090要首发 性能要翻倍！三星展示GDDR7显存
三星在GTC上展示了专为下一代游戏GPU设计的GDDR7内存。
首次推出的GDDR7内存模块密度为16GB，每个模块容量为2GB。其速度预设为32 Gbps（PAM3），但也可以降至28 Gbps，以提高产量和初始阶段的整体性能和成本效益。
据三星表示，GDDR7内存的能效将提高20%，同时工作电压仅为1.1V，低于标准的1.2V。通过采用更新的封装材料和优化的电路设计，使得在高速运行时的发热量降低，GDDR7的热阻比GDDR6降低了70%。