How to ignore "IndexError: list index out of range" on SQL Execute Insert statement

Question

我正在使用 Python 2.7 从 JSON API 中提取数据并将其推送到 SQL-服务器 table。我在将数据插入数据库时遇到问题，其中从 JSON 响应返回的某些条目缺少字典的一部分。 IE，"CustomFields"：90% 的条目有信息，但是 10% 没有，因此我得到一个索引错误例如

"CustomFields":[
],

对

"CustomFields":[
{
"Type":"foo",
"Name":"foo",
"Value":"foo"
},
{
"Type":"foo",
"Name":"foo",
"Value":"foo"
},
{
"Type":"foo",
"Name":"foo",
"Value":"foo"
},

我要更改什么以便在缺少索引时用 'NULL' 条目替换到数据库中。

response = '*API URL*'
json_response = json.loads(urllib2.urlopen(response).read())

conn = pypyodbc.connect(r'Driver={SQL Server};Server=*Address*;Database=*DataBase*;Trusted_Connection=yes;')
conn.autocommit = False
c = conn.cursor()

c.executemany("INSERT INTO phil_targetproccess (ResourceType, Id, Name, StartDate, EndDate, TimeSpent, CreateDate, ModifyDate, LastStateChangeDate, ProjectName, EntityStateName, RequestTypeName, AssignedTeamMember#1, Area, SubArea, BusinessTeam) VALUES (?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)" ,
             [(x['ResourceType'],
               x['Id'],
               x['Name'],
               (parse_date(x['StartDate'])),
               (parse_date(x['EndDate'])),
               x['TimeSpent'],
               (parse_date(x['CreateDate'])),
               (parse_date(x['ModifyDate'])),
               (parse_date(x['LastStateChangeDate'])),
               x['Project']['Name'],
               x['EntityState']['Name'],
               x['RequestType']['Name'],
               y['GeneralUser']['FirstName']+' '+y['GeneralUser']['LastName'],
               x['CustomFields'][0]['Value'],
               x['CustomFields'][1]['Value'],
               x['CustomFields'][2]['Value'])
               for x in json_response['Items']
                  for y in x['Assignments']['Items']])

非常感谢。

Answer 1

我想你的问题就在这里

 x['CustomFields'][0]['Value'],
 x['CustomFields'][1]['Value'],
 x['CustomFields'][2]['Value']

当 CustomFields 没有元素时

尝试

 x['CustomFields'][0]['Value'] if len(x['CustomFields']) > 0 else '',
 x['CustomFields'][1]['Value'] if len(x['CustomFields']) > 1 else '',
 x['CustomFields'][2]['Value'] if len(x['CustomFields']) > 2 else '',

Answer 2

您可以使用get方法来检查是否value in CustomFields

可用，如果可以检查列表的长度，然后使用相同的 get 方法获取该列表中字典的值。

例如：

customfield_value = (x['CustomFields'][0]).get("Value",None) if len(x['CustomFields'])>0 else None

如果索引 0 中不存在该值，这将 return None。您可以按照相同的方法从其他 2 个索引获取值。不明白的请评论，我会进一步解释。

Answer 3

最终脚本。感谢您的帮助！

   c.executemany("INSERT INTO phil_targetproccess (ResourceType, Id, Name, StartDate, EndDate, TimeSpent, CreateDate, "
          "ModifyDate, LastStateChangeDate, ProjectName, EntityStateName, RequestTypeName, AssignedTeamMember1, "
          "AssignedTeamMember2, AssignedTeamMember3, AssignedTeamMember4, Area, SubArea, BusinessTeam) VALUES (?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)",
          [(x['ResourceType'],
            x['Id'],
            x['Name'],
            (parse_date(x['StartDate'])),
            (parse_date(x['EndDate'])),
            x['TimeSpent'],
            (parse_date(x['CreateDate'])),
            (parse_date(x['ModifyDate'])),
            (parse_date(x['LastStateChangeDate'])),
            x['Project']['Name'],
            x['EntityState']['Name'],
            x['RequestType']['Name'],
            x['Assignments']['Items'][0]['GeneralUser']['FirstName'] + ' ' + x['Assignments']['Items'][0]['GeneralUser']['LastName'] if len(x['Assignments']['Items']) > 0 else None,
            x['Assignments']['Items'][1]['GeneralUser']['FirstName'] + ' ' + x['Assignments']['Items'][1]['GeneralUser']['LastName'] if len(x['Assignments']['Items']) > 1 else None,
            x['Assignments']['Items'][2]['GeneralUser']['FirstName'] + ' ' + x['Assignments']['Items'][2]['GeneralUser']['LastName'] if len(x['Assignments']['Items']) > 2 else None,
            x['Assignments']['Items'][3]['GeneralUser']['FirstName'] + ' ' + x['Assignments']['Items'][3]['GeneralUser']['LastName'] if len(x['Assignments']['Items']) > 3 else None,
            x['CustomFields'][0]['Value'] if len(x['CustomFields']) > 0 else '',
            x['CustomFields'][1]['Value'] if len(x['CustomFields']) > 1 else '',
            x['CustomFields'][2]['Value'] if len(x['CustomFields']) > 2 else '')
           for x in json_response['Items']])

How to ignore "IndexError: list index out of range" on SQL Execute Insert statement

How to ignore "IndexError: list index out of range" on SQL Execute Insert statement

python

pyodbc

python-2.7

pypyodbc