Python之csv文件从MySQL数据库导入导出的方法

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')

来源：https://blog.csdn.net/qq_33689414/article/details/78310689