使用python将json插入mysql

Question

您好，我可以查询但无法使用以下代码插入到我的 json 字段中，问题不是很困难，但由于我对 mysql 的绝对新手无法弄清楚..每次我都会得到一个变量调用 last_time首先我需要插入，然后从第二次开始我需要更新 last_time..如果我手动执行，我可以根据需要执行并获取输出..如下图所示..

import pymysql.cursors
import datetime
import json

last_time='2344' #this value i will get output from my program

connection = pymysql.connect(host='localhost',
                         user='root',
                         password='Admin...',
                         db='cl......',
                         charset='utf8mb4',
                         cursorclass=pymysql.cursors.DictCursor)
print "connect successfull"

try:
   with connection.cursor() as cursor:
      sql = "INSERT INTO `tt_inv_refresh` (`cust_id`, `res_type`, `refresh_dtls`) VALUES (%s, %s, %s)"
      cursor.execute(sql, ('2','elb','{"vot":[{"elb":"name1","last_refreshtime":last_time},{"elb":"name2","last_refreshtime":last_time}]}'))
connection.commit()

except Exception as e:
   print str(e)

print "inserted"

finally:
   connection.close()

如果有人指出我的代码中的错误，我们将不胜感激...谢谢

Answer 1

你错过了last_time周围的报价

将cursore.execute的行改正为

cursor.execute(sql, ('2','elb','{"vot":
      [{"elb":"name1","last_refreshtime":' + last_time + '},
      {"elb":"name2","last_refreshtime":' + last_time+ '}]}'))

为避免以后出现此类问题，您可以考虑定义一个对象并使用json.dumps

class Elb:

    def toJSON(self):
        return json.dumps(self, default=lambda o: o.__dict__, 
        sort_keys=True, indent=4)

    # you can use array or dict | I just copied from one of my code
    # which reqd it to be an array
    def mapper(self, detailArray = []): # you can use array or dict
        self.elb = detailArray[0];
        self.last_refreshtime = detailArray[1];

所以在你为一个实例设置数据之后，

el_instance = Elb()
el_instance.mapper(<array-with-data>)

您可以在任何地方拨打el_instance.toJSON()获取序列化数据。