Python之csv文件从MySQL数据库导入导出的方法

import pymysqlimport csvimport codecsdef get_conn():  conn = pymysql.connect(host='localhost', port=3306, user='root', passwd='root', db='test_csv', charset='utf8')  return conndef 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')

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

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;

import pymysqlimport csvimport codecsdef get_conn():  conn = pymysql.connect(host='localhost', port=3306, user='root', passwd='root', db='test_csv', charset='utf8')  return conndef 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')