以基本的學生選課為例，建立選課數據庫，學生、班級、選課信息三張表，并分別對表進行插刪改操作：

import?MySQLdb

try:

conn?=?MySQLdb.connect(host?=?'localhost',?user?=?'root',?passwd?=?'root',?db?=?'xuanke',?port?=?3306)

cur?=?conn.cursor()

cur.execute("CREATE?DATABASE?xuanke")

cur.execute("CREATE?TABLE?Student?(Sno?VARCHAR(9)?PRIMARY?KEY,?Sname?VARCHAR(20)?UNIQUE,?Ssex?VARCHAR(2),?Sage?SMALLINT,?Sdept?VARCHAR(20))")

cur.execute("CREATE?TABLE?Course?(Cno?VARCHAR(4)?PRIMARY?KEY,?Cname?VARCHAR(40),?Cpno?VARCHAR(4),?Ccredit?SMALLINT,?FOREIGN?KEY?(Cpno)?REFERENCES?Course(Cno))")

cur.execute("CREATE?TABLE?SC?(Sno?VARCHAR(9),?Cno?VARCHAR(4),?Grade?SMALLINT,?PRIMARY?KEY?(Sno,?Cno),?FOREIGN?KEY?(Sno)?REFERENCES?Student(Sno),?FOREIGN?KEY?(Cno)?REFERENCES?Course(Cno))")

cur.execute("INSERT?INTO?Student?VALUES?('200215121',?'Stephen?Zhou',?'M',?'20',?'CS')")

cur.execute("INSERT?INTO?Student?VALUES?('200215122',?'Stan?Qian',?'M',?'23',?'CS')")

cur.execute("INSERT?INTO?Student?VALUES?('200215123',?'Linda?Fan',?'F',?'21',?'MA')")

cur.execute("INSERT?INTO?Student?VALUES?('200215125',?'Zac?Gu',?'M',?'26',?'IS')")

cur.execute("INSERT?INTO?Course?VALUES?('2',?'Math',?Null,?'2')")

cur.execute("INSERT?INTO?Course?VALUES?('6',?'Data?Processing',?Null,?'2')")

cur.execute("INSERT?INTO?Course?VALUES?('7',?'PASCAL',?'6',?'4')")

cur.execute("INSERT?INTO?Course?VALUES?('5',?'Data?Structure',?'7',?'4')")

cur.execute("INSERT?INTO?Course?VALUES?('1',?'Database',?'5',?'4')")

cur.execute("INSERT?INTO?Course?VALUES?('3',?'Information?System',?'1',?'4')")

cur.execute("INSERT?INTO?Course?VALUES?('4',?'Operating?System',?'6',?'3')")

cur.execute("INSERT?INTO?SC?VALUES('200215121',?'1',?'92')")

cur.execute("INSERT?INTO?SC?VALUES('200215121',?'2',?'85')")

cur.execute("INSERT?INTO?SC?VALUES('200215121',?'3',?'88')")

cur.execute("INSERT?INTO?SC?VALUES('200215122',?'2',?'90')")

cur.execute("INSERT?INTO?SC?VALUES('200215122',?'3',?'80')")

cur.execute("INSERT?INTO?Student?VALUES('200215128',?'Cuan?Qu',?'M',?'22',?'IS')")

cur.execute("UPDATE?Student?SET?Sage?=?'23'?WHERE?Sno?=?'200215128'")

cur.execute("UPDATE?Student?SET?Sage?=?Sage?+?7")

cur.execute("DELETE?FROM?Student?WHERE?Sno?=?'200215128'")

cur.close()

conn.commit()

conn.close()

except?MySQLdb.Error,?e:

print?'Mysql?error?msg:?',?e

顯示數據庫：

顯示所建表：

顯示學生表：

顯示課程表：

顯示選課信息表：

注：以上python程序中插入操作需要一步步運行，特別是課程表中‘Cpno’為先選課程，其為課程表外鍵并與Course.Cno參照，必須按順序依次插入。

總結

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