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40 lines
1.3 KiB
40 lines
1.3 KiB
6 months ago
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import pymysql
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import logging
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import datetime
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def Return(conn,CardNum,BookNum):
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if(CardNum=="" or BookNum==""):
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return "不能为空"
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try:
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cursor=conn.cursor()
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sql="select numbers from card where cnum=%s"
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cursor.execute(sql,CardNum)
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num_=cursor.fetchone()
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num=num_[0]-1
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sql="select bname,collection,rtime from book natural join borrow where bnum=%s and cnum=%s"
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cursor.execute(sql,(BookNum,CardNum))
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result=cursor.fetchone()
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if result is None:
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return "您尚未借阅此书，因此无法还书"
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else:
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name=result[0]
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collection=result[1]
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r_time=result[2]
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collection+=1
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n_time=datetime.datetime.now()
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if(n_time>r_time):
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late=1
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else:
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late=0
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sql="update book set collection=%s where bnum=%s"
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cursor.execute(sql,(collection,BookNum))
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sql="delete from borrow where bnum=%s and cnum=%s"
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cursor.execute(sql,(BookNum,CardNum))
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sql="update card set numbers=%s where cnum=%s"
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cursor.execute(sql,(num,CardNum))
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conn.commit()
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return (name,late)
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except Exception as e:
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logging.exception(e)
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conn.rollback()
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return e
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