如何从其他渠道获取查询结果

Question

当我想在我的fabric中获得查询结果时，我遇到了麻烦。我有2个渠道，渠道1存储帐户数据，渠道2存储一些内容和他们的成本。我在频道1，我想在channel2中查询一个内容的成本，然后在频道1中“购买”它。例如，channel1有一个帐户A，他有20美元，channel2有一个电影成本9美元，A想查询电影的成本，然后“购买”它，所以A现在只有11美元。但是现在我不知道如何从channel2那里得到"$9“。我该怎么做呢？

Answer 1

Fabric使用通道作为一种隔离形式。无论您如何使用'InvokeChaincode‘API调用另一个链码。

// InvokeChaincode locally calls the specified chaincode `Invoke` using the
    // same transaction context; that is, chaincode calling chaincode doesn't
    // create a new transaction message.
    // If the called chaincode is on the same channel, it simply adds the called
    // chaincode read set and write set to the calling transaction.
    // If the called chaincode is on a different channel,
    // only the Response is returned to the calling chaincode; any PutState calls
    // from the called chaincode will not have any effect on the ledger; that is,
    // the called chaincode on a different channel will not have its read set
    // and write set applied to the transaction. Only the calling chaincode's
    // read set and write set will be applied to the transaction. Effectively
    // the called chaincode on a different channel is a `Query`, which does not
    // participate in state validation checks in subsequent commit phase.
    // If `channel` is empty, the caller's channel is assumed.
    InvokeChaincode(chaincodeName string, args [][]byte, channel string) pb.Response

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