#coding:utf-8

import mysql.connector

mydb = mysql.connector.connect(

host='localhost',

user='root',

passwd='123456',

database='mydatabase',

buffered = True

)

print(mydb)

#1、創建數據庫并插入數據：

mycursor = mydb.cursor()

sql = "insert into customers(name,address) values(%s,%s)"

val =("John","London 21")

mycursor.execute(sql,val)

mydb.commit()

print(mycursor.rowcount,"record inserted")

val2 = [

('Peter', 'Lowstreet 4'),

('Amy', 'Apple st 652'),

('Hannah', 'Mountain 21'),

('Michael', 'Valley 345'),

('Sandy', 'Ocean blvd 2'),

('Betty', 'Green Grass 1'),

('Richard', 'Sky st 331'),

('Susan', 'One way 98'),

('Vicky', 'Yellow Garden 2'),

('Ben', 'Park Lane 38'),

('William', 'Central st 954'),

('Chuck', 'Main Road 989'),

('Viola', 'Sideway 1633')

]

insertFn(mycursor,'customers','name,address',val2) #插入多條數據

# select出重復數據并刪除

def deleteSameData(delSql,tableName):

mycursor.execute(delSql)

mycursor.execute(str("select * from " +tableName))

myresult1 = mycursor.fetchall()

for x in myresult1:

print(x)

#select出重復數據并刪除

print("select出重復數據并刪除")

#根據name字段count計算>1表示有重復，只顯示最小id的客戶信息

sql="select * from customers where id in (select min(id) from customers group by name having count(id)>1)"

delSql="delete from a using customers as a where a.id not in (select * from (select min(id) from customers group by name having count(id)>1) a)"

deleteSameData(delSql,'customers')

總結

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