UpdateExpression 使用 boto3 在 DynamoDB table 中为更新函数获取动态值

Question

这是第一部分的两部分问题

现在我想要实现的是具有要更新的动态值

def lambda_handler(event, context):
    param = event['queryStringParameters']['employeID']
    name = event['queryStringParameters']['employeName']
    dynamodb = boto3.resource('dynamodb', region_name="us-east-1")
    table = dynamodb.Table('api_demo_employe')
    column = [cloumn1,cloumn2......]
    for i in range(0,len(column):

       query = 'SET {} = :f'.format(column[i])

       response = table.update_item(
           Key = {
               'employeID' : param
           },
           ExpressionAttributeValues = {
    
              ':f': name
          },
           UpdateExpression = query
    
          )

我收到一个错误

 "errorMessage": "An error occurred (ValidationException) when calling the UpdateItem operation: One or more parameter values were invalid: Cannot update attribute employeID. This attribute is part of the key",

我知道问题在于我如何处理 UpdateExpression

谁能帮我把这个放好？

Answer 1

您正在尝试更新项目的密钥，但没有成功。您将必须删除并重新创建项目。

详情请参考Amazon DynamoDB documentation:

You cannot use UpdateItem to update any primary key attributes. Instead, you will need to delete the item, and then use PutItem to create a new item with new attributes.