python mysql 学生成绩管理系统
这学期在学python，感觉想写一个东西来巩固自己的基础，因为大二的时候我看过python，所以还是一共花了几个小时写了一个基于mysql的成绩管理系统，这个东西其实拿不出手，不过就当复习基本了
1 首先如果你python中没安装mysql的驱动，还是要打开cmd命令行安装一下才可以使用：
pip3 install PyMySQL
2 创建数据库studentdb，你可以在图形化界面sqlyog中创建:
3 然后在数据库中创建表st
4 python连接数据库的核心代码：
db = pymysql.connect(host='localhost',
user='root',
password='333',
database='studentdb')
cursor = db.cursor()
- 1
- 2
- 3
- 4
- 5
user就是你自己设置的用户名，password就是你自己设置的密码，database就是你刚刚设置的数据库
5 另外你也可以选择mysql命令行创建数据库以及数据表都是可以的
6 完整代码如下：
import pymysql
def menu():
print(" 学生信息管理系统 ")
print(" 1 添加学生 ")
print(" 2 删除学生 ")
print(" 3 修改学生 ")
print(" 4 按成绩降序排序： ")
print(" 5 按成绩升序排序： ")
print(" 6 查询： ")
print(" 7 退出程序 ")
pass
def insert():
print("插入学生信息")
name = input("请输入学生姓名：")
sex = input("请输入学生性别：")
snum = input("请输入学生学号：")
chinese = int(input("请输入学生语文成绩："))
math = int(input("请输入学生数学成绩："))
stotal = int(input("请输入学生总成绩："))
db = pymysql.connect(host='localhost',
user='root',
password='333',
database='studentdb')
cursor = db.cursor()
sql = "insert into st(sname,ssex,snum,chinese,math,stotal) values('%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%s','%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%s','%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%s',%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%d,%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%d,%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%d)"%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%(name,sex,snum,chinese,math,stotal)
try:
cursor.execute(sql)
db.commit()
except:
db.rollback()
print("error")
db.close()
pass
def delete():
while 1:
print("删除学生信息")
choose1 = int(input("请输入您的删除方式：1 按姓名 2 按学号: "))
if choose1 == 1:
print("按姓名删除")
strname = input("请输入删除学生的名字：")
db = pymysql.connect(host='localhost',
user='root',
password='333',
database='studentdb')
cursor = db.cursor()
sql1 = "select *from st where sname='%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%s'"%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%(strname)
cursor.execute(sql1)
if cursor.rowcount>0:
try:
sql = "DELETE FROM st WHERE sname = '%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%s'" %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% (strname)
cursor.execute(sql)
db.commit()
print("删除姓名为%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%s的学生信息成功" %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% (strname))
break
except:
db.rollback()
print("error")
db.close()
else:
print("没有这个学生的信息，输入错误")
break
elif choose1 == 2:
print("按学号删除")
strnum = input("请输入删除学生的学号：")
db = pymysql.connect(host='localhost',
user='root',
password='333',
database='studentdb')
cursor = db.cursor()
sql1 = "select *from st where snum='%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%s'"%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%(strnum)
cursor.execute(sql1)
if cursor.rowcount>0:
sql = "DELETE FROM st WHERE snum = '%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%s'" %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% (strnum)
try:
cursor.execute(sql)
db.commit()
print("删除学号为%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%s学生的信息成功" %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% (strnum))
break
except:
db.rollback()
print("error")
db.close()
else:
print("没有这个学生的信息，输入错误")
break
else:
print("输入错误，重新输入")
break
pass
pass
pass
def change():
while 1:
print("改变学生信息")
myname = input("请输入改变学生的名字:")
db = pymysql.connect(host='localhost',
user='root',
password='333',
database='studentdb')
cursor = db.cursor()
sql1 = "select *from st where sname='%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%s'"%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%(myname)
cursor.execute(sql1)
results = cursor.fetchall()
name12='0'
for row in results:
name12 = row[0]
if myname == name12:
try:
sex = input("请输入学生性别：")
snum = input("请输入学生学号：")
chinese = int(input("请输入学生语文成绩："))
math = int(input("请输入学生数学成绩："))
stotal = int(input("请输入学生总成绩："))
#有问题解决不了
sql3 = "update st set ssex ='%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%s',snum='%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%s',chinese=%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%d,math=%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%d,stotal=%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%d where sname='%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%s'"%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%(sex,snum,chinese,math,stotal,name12)
cursor.execute(sql3)
db.commit()
print("修改姓名为%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%s学生的信息成功"%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%(myname))
break
except:
db.rollback()
print("error")
db.close()
break
else:
print("没有这个学生的信息，输入错误")
break
pass
pass
pass
def sortbyscoredesc():
print("按成绩降序")
db = pymysql.connect(host='localhost',
user='root',
password='333',
database='studentdb')
cursor = db.cursor()
sql = "select * from st order by stotal desc"
try:
cursor.execute(sql)
results = cursor.fetchall()
for row in results:
name1 = row[0]
sex1 = row[1]
num1 = row[2]
chinses1 = row[3]
math1 = row[4]
total1 = row[5]
# 打印结果
print("学生姓名:%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%s ,学生性别:%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%s ,学生学号:%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%s ,语文成绩:%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%d ,数学成绩:%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%d ,总成绩:%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%d " %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
(name1, sex1, num1, chinses1, math1, total1))
db.commit()
except:
db.rollback()
print("error")
db.close()
pass
def sortbyscore():
print("按成绩升序排序")
db = pymysql.connect(host='localhost',
user='root',
password='333',
database='studentdb')
cursor = db.cursor()
sql = "select * from st order by stotal asc "
try:
cursor.execute(sql)
results = cursor.fetchall()
for row in results:
name1 = row[0]
sex1 = row[1]
num1 = row[2]
chinses1 = row[3]
math1 = row[4]
total1 = row[5]
# 打印结果
print("学生姓名:%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%s ,学生性别:%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%s ,学生学号:%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%s ,语文成绩:%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%d ,数学成绩:%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%d ,总成绩:%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%d " %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
(name1, sex1, num1, chinses1, math1, total1))
db.commit()
except:
db.rollback()
print("error")
db.close()
pass
def select():
print("查询学生信息")
db = pymysql.connect(host='localhost',user='root',password='333',database='studentdb')
cursor = db.cursor()
sql = "select * from st"
try:
cursor.execute(sql)
results = cursor.fetchall()
for row in results:
name1 = row[0]
sex1 = row[1]
num1 = row[2]
chinses1 = row[3]
math1 = row[4]
total1 = row[5]
# 打印结果
print("学生姓名:%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%s ,学生性别:%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%s ,学生学号:%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%s ,语文成绩:%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%d ,数学成绩:%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%d ,总成绩:%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%d " %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
(name1,sex1,num1,chinses1,math1,total1))
db.commit()
except:
db.rollback()
print("error")
db.close()
pass
def exitexe():
while 1:
print("确定要退出系统吗？退出(y) 不退出(n)")
c = input("请输入您的选择aaaa： ")
if c == 'y':
exit()
elif c == 'n':
break
else:
print("输入有误 重新输入")
pass
pass
if __name__ == '__main__':
while True:
menu()
choose = int(input("请输入您的选择: "))
if choose == 1:
insert()
elif choose == 2:
delete()
elif choose == 3:
change()
elif choose == 4:
sortbyscoredesc()
elif choose == 5:
sortbyscore()
elif choose == 6:
select()
elif choose == 7:
exitexe()
pass
pass
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 14
- 15
- 16
- 17
- 18
- 19
- 20
- 21
- 22
- 23
- 24
- 25
- 26
- 27
- 28
- 29
- 30
- 31
- 32
- 33
- 34
- 35
- 36
- 37
- 38
- 39
- 40
- 41
- 42
- 43
- 44
- 45
- 46
- 47
- 48
- 49
- 50
- 51
- 52
- 53
- 54
- 55
- 56
- 57
- 58
- 59
- 60
- 61
- 62
- 63
- 64
- 65
- 66
- 67
- 68
- 69
- 70
- 71
- 72
- 73
- 74
- 75
- 76
- 77
- 78
- 79
- 80
- 81
- 82
- 83
- 84
- 85
- 86
- 87
- 88
- 89
- 90
- 91
- 92
- 93
- 94
- 95
- 96
- 97
- 98
- 99
- 100
- 101
- 102
- 103
- 104
- 105
- 106
- 107
- 108
- 109
- 110
- 111
- 112
- 113
- 114
- 115
- 116
- 117
- 118
- 119
- 120
- 121
- 122
- 123
- 124
- 125
- 126
- 127
- 128
- 129
- 130
- 131
- 132
- 133
- 134
- 135
- 136
- 137
- 138
- 139
- 140
- 141
- 142
- 143
- 144
- 145
- 146
- 147
- 148
- 149
- 150
- 151
- 152
- 153
- 154
- 155
- 156
- 157
- 158
- 159
- 160
- 161
- 162
- 163
- 164
- 165
- 166
- 167
- 168
- 169
- 170
- 171
- 172
- 173
- 174
- 175
- 176
- 177
- 178
- 179
- 180
- 181
- 182
- 183
- 184
- 185
- 186
- 187
- 188
- 189
- 190
- 191
- 192
- 193
- 194
- 195
- 196
- 197
- 198
- 199
- 200
- 201
- 202
- 203
- 204
- 205
- 206
- 207
- 208
- 209
- 210
- 211
- 212
- 213
- 214
- 215
- 216
- 217
- 218
- 219
- 220
- 221
- 222
- 223
- 224
- 225
- 226
- 227
- 228
- 229
- 230
- 231
- 232
- 233
- 234
- 235
- 236
- 237
- 238
- 239
- 240
- 241
- 242
- 243
- 244
- 245
- 246
- 247
- 248
- 249
- 250
- 251
- 252
- 253
- 254
- 255
- 256
- 257
- 258
- 259
- 260
- 261
- 262
7 运行结果如下：
8 总结：
在这个案例中，我遇到的问题就是在sql语句和python间，有时候忘记commit，就要测试十几分钟来解决，然后就是如何设置用户输入错误指令的问题，我用了while循环和break pass来解决，总体上这个项目不难，对初学python的人很有用，我仅用了最基本的语法，元组，列表集合基本没用，如果你有更好的想法私信我，下一步我将它开发为一个图形化界面的系统
推荐阅读