AWSDynamoDBObjectMapper *dynamoDBObjectMapper = [AWSDynamoDBObjectMapper defaultDynamoDBObjectMapper];
AWSDynamoDBScanExpression *scanExpression = [AWSDynamoDBScanExpression new];
scanExpression.exclusiveStartKey = nil;
scanExpression.limit = @20;
[[[dynamoDBObjectMapper scan:[DDBTableRow class]
expression:scanExpression]
continueWithExecutor:[BFExecutor mainThreadExecutor] withSuccessBlock:^id(BFTask *task) { ................
我能够扫描并返回 DynamoDB 中特定表记录的前 20 个记录,如上面的一段代码所示。
现在的问题是我想添加一个scanExpression.scanFilter =
财产,但我还没有找到关于如何建造它的任何好的方向。我在用AWSiOSSDKv2
适用于 iOS 的 aws sdkxcode6
这是我到目前为止所拥有的。它还没有完成:
AWSDynamoDBCondition *condition = [AWSDynamoDBCondition new];
AWSDynamoDBAttributeValue *attribute = [AWSDynamoDBAttributeValue new];
attribute.N = @"400";
condition.comparisonOperator = AWSDynamoDBComparisonOperatorEQ;
NSDictionary *scanFilter = @{@"lat":
@{@"AttributeValueList":attribute,
@"ComparisonOperator":@1}
};
scanExpression.scanFilter = scanFilter;
您可以按如下方式使用它:
AWSDynamoDBCondition *condition = [AWSDynamoDBCondition new];
AWSDynamoDBAttributeValue *attribute = [AWSDynamoDBAttributeValue new];
attribute.N = @"400";
condition.attributeValueList = @[attribute];
condition.comparisonOperator = AWSDynamoDBComparisonOperatorEQ;
scanExpression.scanFilter = @{@"lat": condition};
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