Python AWS Lambda DynamoDB查询错误
我正在用python编写AWS Lambda函数。我正在使用boto3连接到DynamoDB数据库,并尝试检索最后一个位置条目 DynamoDB表有一个主分区键“Serial”,它是一个字符串,还有一个主排序键“Time”,也是一个字符串 当我运行此代码时,试图获取序列号“0001”的最后一个条目时,我得到以下错误Python AWS Lambda DynamoDB查询错误,python,amazon-web-services,lambda,amazon-dynamodb,Python,Amazon Web Services,Lambda,Amazon Dynamodb,我正在用python编写AWS Lambda函数。我正在使用boto3连接到DynamoDB数据库,并尝试检索最后一个位置条目 DynamoDB表有一个主分区键“Serial”,它是一个字符串,还有一个主排序键“Time”,也是一个字符串 当我运行此代码时,试图获取序列号“0001”的最后一个条目时,我得到以下错误 def getPriorGeofence(device): client = boto3.client('dynamodb') response = client.query(
def getPriorGeofence(device):
client = boto3.client('dynamodb')
response = client.query(
TableName='Locations',
IndexName='Serial',
Select='ALL_ATTRIBUTES',
Limit=1,
ScanIndexForward=True,
KeyConditions={
"Serial":{
'ComparisonOperator': "EQ",
'AttributeValueList': [device]
}
}
)
return response
错误
{
“stackTrace”:[
[
“/var/task/lambda_function.py”,
154,
“lambda_handler”,
“priorGeofence=getPriorGeofence(串行)”
],
[
“/var/task/lambda_function.py”,
110,
“getPriorGeofence”,
“'AttributeValueList':[设备]”
],
[
“/var/runtime/botocore/client.py”,
253,
“_api_调用”,
返回self.\u make\u api\u调用(操作名称,kwargs)
],
[
“/var/runtime/botocore/client.py”,
517,
“_make_api_call”,
api参数,操作模型,上下文=请求上下文
],
[
“/var/runtime/botocore/client.py”,
572,
“\u将\u转换为\u请求\u命令”,
api参数,操作模型
],
[
“/var/runtime/botocore/validate.py”,
270,
“将\u序列化为\u请求”,
“raise ParamValidationError(report=report.generate_report())”
]
],
“errorType”:“ParamValidationError”,
errorMessage:“参数验证失败:\n参数KeyConditions.Serial.AttributeValueList[0]的类型无效,值:0001,类型:,有效类型:
}
如下所述更改AttributeValueList值(即明确将数据类型称为字符串S):-
更改AttributeValueList值,如下所述(即明确地将数据类型称为字符串“S”):-
{
"stackTrace": [
[
"/var/task/lambda_function.py",
154,
"lambda_handler",
"priorGeofence = getPriorGeofence(serial)"
],
[
"/var/task/lambda_function.py",
110,
"getPriorGeofence",
"'AttributeValueList': [device]"
],
[
"/var/runtime/botocore/client.py",
253,
"_api_call",
"return self._make_api_call(operation_name, kwargs)"
],
[
"/var/runtime/botocore/client.py",
517,
"_make_api_call",
"api_params, operation_model, context=request_context)"
],
[
"/var/runtime/botocore/client.py",
572,
"_convert_to_request_dict",
"api_params, operation_model)"
],
[
"/var/runtime/botocore/validate.py",
270,
"serialize_to_request",
"raise ParamValidationError(report=report.generate_report())"
]
],
"errorType": "ParamValidationError",
"errorMessage": "Parameter validation failed:\nInvalid type for parameter KeyConditions.Serial.AttributeValueList[0], value: 0001, type: <type 'unicode'>, valid types: <type 'dict'>"
}
KeyConditions={
"Serial":{
'ComparisonOperator': "EQ",
'AttributeValueList': [{'S' : device}]
}
}