Python从MySQL数据库中导出csv文件处理

csv文件导入MySQL数据库

import pymysql

import csv

import codecs

def get_conn():

conn = pymysql.connect(host='localhost', port=3306, user='root', passwd='root', db='test_csv', charset='utf8')

return conn

def insert(cur, sql, args):

cur.execute(sql, args)

def read_csv_to_mysql(filename):

with codecs.open(filename=filename, mode='r', encoding='utf-8') as f:

reader = csv.reader(f)

head = next(reader)

conn = get_conn()

cur = conn.cursor()

sql = 'insert into tb_csv values(%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s)'

for item in reader:

if item[1] is None or item[1] == '': # item[1]作为唯一键，不能为null

continue

args = tuple(item)

print(args)

insert(cur, sql=sql, args=args)

conn.commit()

cur.close()

conn.close()

if __name__ == '__main__':

read_csv_to_mysql('1.csv')

注：

1.csv文件的表头如：

序号,合同编号,义务人,档案柜号,柜内编号,权利人,放款金额,放款日期,他项权利证编号,抵押物地址,结清出库日期,备注,地区

mysql的创建tb_csv表语句

CREATE TABLE tb_csv(

xuhao VARCHAR(20),

htcode VARCHAR(20),

yiwuren VARCHAR(20),

dagh VARCHAR(20),

gncode VARCHAR(20),

quanliren VARCHAR(20),

fkmoney VARCHAR(20),

fkdata VARCHAR(20),

qitacode VARCHAR(20),

diyaaddr VARCHAR(100),

jqdata VARCHAR(30),

beizhu VARCHAR(30),

zone VARCHAR(30),

PRIMARY KEY(htcode)

)CHARSET=utf8;

这里为了省事，表中的字段都指明varchar类型

MySQL数据库写入csv文件

import pymysql

import csv

import codecs

def get_conn():

conn = pymysql.connect(host='localhost', port=3306, user='root', passwd='root', db='test_csv', charset='utf8')

return conn

def query_all(cur, sql, args):

cur.execute(sql, args)

return cur.fetchall()

def read_mysql_to_csv(filename):

with codecs.open(filename=filename, mode='w', encoding='utf-8') as f:

write = csv.writer(f, dialect='excel')

conn = get_conn()

cur = conn.cursor()

sql = 'select * from tb_csv'

results = query_all(cur=cur, sql=sql, args=None)

for result in results:

print(result)

write.writerow(result)

if __name__ == '__main__':

read_mysql_to_csv('2.csv')

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