python mysql實現學生成績管理系統
這學期在學python,感覺想寫一個東西來鞏固自己的基礎,因為大二的時候我看過python,所以還是一共花瞭幾個小時寫瞭一個基於mysql的成績管理系統,這個東西其實拿不出手,不過就當復習基本瞭
1 首先如果你python中沒安裝mysql的驅動,還是要打開cmd命令行安裝一下才可以使用:
pip3 install PyMySQL
2 創建數據庫studentdb,你可以在圖形化界面sqlyog中創建:
3 然後在數據庫中創建表st
4 python連接數據庫的核心代碼:
db = pymysql.connect(host='localhost', user='root', password='333', database='studentdb') cursor = db.cursor()
user就是你自己設置的用戶名,password就是你自己設置的密碼,database就是你剛剛設置的數據庫
5 另外你也可以選擇mysql命令行創建數據庫以及數據表都是可以的
6 完整代碼如下:
import pymysql def menu(): print("\t\t學生信息管理系統\t\t") print("\t\t1 添加學生\t\t") print("\t\t2 刪除學生\t\t") print("\t\t3 修改學生\t\t") print("\t\t4 按成績降序排序:\t\t") print("\t\t5 按成績升序排序:\t\t") print("\t\t6 查詢:\t\t") print("\t\t7 退出程序\t\t") pass def insert(): print("插入學生信息") name = input("請輸入學生姓名:") sex = input("請輸入學生性別:") snum = input("請輸入學生學號:") chinese = int(input("請輸入學生語文成績:")) math = int(input("請輸入學生數學成績:")) stotal = int(input("請輸入學生總成績:")) 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("刪除學生信息") choose1 = int(input("請輸入您的刪除方式:1 按姓名 2 按學號: ")) if choose1 == 1: print("按姓名刪除") strname = input("請輸入刪除學生的名字:") 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("刪除姓名為%s的學生信息成功" % (strname)) break except: db.rollback() print("error") db.close() else: print("沒有這個學生的信息,輸入錯誤") break elif choose1 == 2: print("按學號刪除") strnum = input("請輸入刪除學生的學號:") 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("刪除學號為%s學生的信息成功" % (strnum)) break except: db.rollback() print("error") db.close() else: print("沒有這個學生的信息,輸入錯誤") break else: print("輸入錯誤,重新輸入") break pass pass pass def change(): while 1: print("改變學生信息") myname = input("請輸入改變學生的名字:") 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("請輸入學生性別:") snum = input("請輸入學生學號:") chinese = int(input("請輸入學生語文成績:")) math = int(input("請輸入學生數學成績:")) stotal = int(input("請輸入學生總成績:")) #有問題解決不瞭 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("修改姓名為%s學生的信息成功"%(myname)) break except: db.rollback() print("error") db.close() break else: print("沒有這個學生的信息,輸入錯誤") break pass pass pass def sortbyscoredesc(): print("按成績降序") 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] # 打印結果 print("學生姓名:%s\t,學生性別:%s\t,學生學號:%s\t,語文成績:%d\t,數學成績:%d\t,總成績:%d\t" % \ (name1, sex1, num1, chinses1, math1, total1)) db.commit() except: db.rollback() print("error") db.close() pass def sortbyscore(): print("按成績升序排序") 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] # 打印結果 print("學生姓名:%s\t,學生性別:%s\t,學生學號:%s\t,語文成績:%d\t,數學成績:%d\t,總成績:%d\t" % \ (name1, sex1, num1, chinses1, math1, total1)) db.commit() except: db.rollback() print("error") db.close() pass def select(): print("查詢學生信息") 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] # 打印結果 print("學生姓名:%s\t,學生性別:%s\t,學生學號:%s\t,語文成績:%d\t,數學成績:%d\t,總成績:%d\t" % \ (name1,sex1,num1,chinses1,math1,total1)) db.commit() except: db.rollback() print("error") db.close() pass def exitexe(): while 1: print("確定要退出系統嗎?退出(y) 不退出(n)") c = input("請輸入您的選擇aaaa:\t") if c == 'y': exit() elif c == 'n': break else: print("輸入有誤 重新輸入") pass pass if __name__ == '__main__': while True: menu() choose = int(input("請輸入您的選擇:\t")) 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
7 運行結果如下:
8 總結:
在這個案例中,我遇到的問題就是在sql語句和python間,有時候忘記commit,就要測試十幾分鐘來解決,然後就是如何設置用戶輸入錯誤指令的問題,我用瞭while循環和break pass來解決,總體上這個項目不難,對初學python的人很有用,我僅用瞭最基本的語法,元組,列表集合基本沒用,如果你有更好的想法私信我,下一步我將它開發為一個圖形化界面的系統。
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