Python之csv文件从MySQL数据库导入导出的方法_Python

Python之csv文件从MySQL数据库导入导出的方法

2021-03-07 00:35张行之 Python

今天小编就为大家分享一篇Python之csv文件从MySQL数据库导入导出的方法，具有很好的参考价值，希望对大家有所帮助。一起跟随小编过来看看吧

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：

1	`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')