在 python 烧瓶中使用空格动态更新 postgresql 表数据

Posted 2023-03-31

【中文标题】在 python 烧瓶中使用空格动态更新 postgresql 表数据

【英文标题】：Dynamic update in postgresql table data with spaces in python flask

【发布时间】：2020-07-05 14:35:48

【问题描述】：

我的查询是，

  engine = create_engine("postgres://")
  conn = engine.connect()
  conn.autocommit = True

在 Flask Route 我使用这个查询，

  result = conn.execute("""UPDATE business_portal SET business_name ="""+str(business_name)+""", name_tag ="""+str(business_tag)+""",name_atr = """+str(business_attr)+""", address =""" +str(address)+""",address_tag =""" +str(address_tag)+""", address_atr = """+str(address_attr)+""", city = """+str(city)+""", city_tag ="""+str(city_tag)+""", city_atr =""" +str(city_attr)+""", state = """+str(state)+""", state_tag = """+str(state_tag)+""",state_atr = """+str(state_attr)+""",zip_code = """+str(zipcode)+""",zip_tag ="""+str(zip_tag)+""",zip_atr ="""+str(zip_attr)+""",contact_number ="""+str(contact_number)+""",num_tag = """+str(contact_tag)+""", num_atr ="""+str(contact_attr)+""",domain ="""+str(domain)+""", search_url = """+str(search_url)+""",category =""" +str(category)+""", logo_path =""" +str(logo_path)+""" WHERE id=%s """,(id))

上面的查询接受没有空格的数据（例如abcd）....但是当数据带有空格时（例如abcd efgh ijkl）它会显示语法错误。

谁能帮帮我？

【参考方案1】：

SET 子句中的值需要以与 WHERE 子句中的值相同的方式引用。

>>> cur = conn.cursor()
>>> stmt = "UPDATE tbl SET col = %s WHERE id = %s"
>>>
>>> # Observe that the SET value is three separate characters
>>> cur.mogrify(stmt % ('a b c', 37))
b'UPDATE tbl SET col = a b c WHERE id = 42'
>>>
>>> # Observe that the SET value is a single, quoted value
>>> cur.mogrify(stmt,  ('a b c', 37))
b"UPDATE tbl SET col = 'a b c' WHERE id = 42"

NB cursor.mogrify 是一种 psycopg2 方法，它打印将由 cursor.execute 发送到服务器的查询：它实际上并不执行查询。