Python之csv文件从MySQL数据库导入导出的方法
发布时间：-10-26 07:39:02
来源：脚本之家
阅读：53
作者：张行之
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)
mit()
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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