Question

我必须从数据库值创建JSON字符串并再次将其推送回数据库。我的Python代码是：

json = "{"
for row in cursor_mysql:
    #mainkey = row[0]
    #name = row[1]
    #value = row[2]
    mainkey = """"  " \n \ /  """    #for testing only
    name = """    {} " \r \t  """    #for testing only
    value = """  ' " \ &      """    #for testing only
    json += """"%s":{"name":"%s","value":"%s"},""" % (re.escape(mainkey), re.escape(name), re.escape(value))

json = json[:-1]
json += "}"
#print json
query = """UPDATE table SET json = '%s' WHERE id = '%d' RETURNING id""" %  (json, rowId)
cursor_postgres.execute(query)
conn_postgres.commit()
insertId = cursor_postgres.fetchone()[0]

当没有恶意字符时，此代码非常有用。但是，在使用非字母数字值时，它不起作用，如上面的测试用例。

进入我的数据库的坏JSON是：

{
    """ 
 \ /   ": {
        "name": " {} "","value":"'"  "
    },
    """ 
 \ /   ": {
        "name": " {} "","value":"'"  "
    }
}

如何清理字符串，以便在反序列化时json输出与输入相同？

Answer 1

import json

data = json.dumps(BIG_STRUCTURE_GOES_HERE)
query = """UPDATE table SET json = %s WHERE id = %s RETURNING id"""
cursor_postgres.execute(query, (data, rowId))
conn_postgres.commit()

Answer 2

http://docs.python.org/library/json.html

http://pypi.python.org/pypi/simplejson/

django.utils.simplejson

Answer 3

只需使用json库：

import json
mainkey = """"  " \n \ /  """    #for testing only
name = """    {} " \r \t  """    #for testing only
value = """  ' " \ &      """    #for testing only
d = {mainkey: {"name": name, "value": value}}
jsonValue = json.dumps(d)

在将字符串用作json对象之前，转义字符串的正确方法是什么

3 个答案: