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importpymysqlimportcsvimportcodecsdefget_con

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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csv文件 MySQL 导入导出