Question

说我只是想得到一个涉及特定资产的所有交易的清单（假设我需要查询这个？）。我应该使用TransactionRegistry还是Historian？有什么区别？

Answer 1

我们有一个当前问题可供Historian用于显示特定资产的更改/增量的历史记录 - https://github.com/hyperledger/composer/issues/991作为一种解决方法，您可以执行以下操作 - 因此对于sample network具有资产的贸易网络商品（以及交易类＆＃39; Trade＆＃39;）您可以创建查询，例如：

query selectTransaction {description: "choose specific commodity asset"
     statement: SELECT org.acme.biznet.Trade 
       WHERE (commodity == _$commodity ) }

关于区别：

Historian记录所有交易活动（例如创建资产，创建参与者，创建身份等等 - 以及商业网络特定的自定义交易，例如＆＃39; TransferAsset＆＃39; PlaceOrder＆＃39;），包括（包括）有关资产/参与者的情况）改变了什么。

对于TransactionRegistry本身（即一个特定的类 - 比如说＆＃39; TransferAsset＆＃39;或者＆＃39; PlaceOrder＆＃39;），它存储在该类的Transaction注册表中 - 您可能有许多Transaction类您的业务网络。但是这里的任何内容都与其他活动无关，例如系统活动，也记录在Historian记录中。

进行查询 - 你会做这样的事情（例如在查询文件中）：

query myTransactions{
description: "return all transactions made (ie system transactions)"
  statement: SELECT org.acme.sample.PlaceOrder
}

即SELECT org.acme.sample.NAME_OF_TRANSACTION_CLASS

对于Historian查询 - 例如

SELECT org.hyperledger.composer.system.HistorianRecord WHERE (transactionType == 'myTranType'

在此处查看更多示例 - ＆gt; https://www.ibm.com/developerworks/cloud/library/cl-create-powerful-blockchain-queries-with-hyperledger-composer/index.html

Answer 2

此外，要查看您正在分区的资产ID的事务数据（增量） - 即可通过事务类的transactionInvoked字段（例如org.acme.trading.Trade事务类）获得。你可以使用带有环回过滤器的REST API -eg（两者都返回下面的承诺）：

return this.httpClient.get('http://localhost:3000/api/Trade?filter=%7B%22include%22%3A%22resolve%22%7D', {withCredentials: true}).toPromise();`

或 return this.httpClient.get('http://localhost:3000/api/Trade?filter=%7B%22include%22%3A%22resolve%22%7D').toPromise();

具有{"include":"resolve"}过滤器来解析事务类中的关系 - 每个已解析的事务都具有事务增量。然后，您可以查找有问题的资产ID。

示例未解析的事务类（下面，后面是已解析的txn类）：

未解决：

[ { "$class": "org.acme.mynetwork.Trade", "commodity": "resource:org.acme.mynetwork.Commodity#1", "newOwner": "resource:org.acme.mynetwork.Trader#2", "transactionId": "354dca97fc6ac00aabbd923883e3ec2a3d09b8c75a54a8f536a88b6df31e8a0f", "timestamp": "2018-03-23T12:02:11.228Z" }, { "$class": "org.acme.mynetwork.Trade", "commodity": "resource:org.acme.mynetwork.Commodity#2", "newOwner": "resource:org.acme.mynetwork.Trader#1", "transactionId": "9da43acca718633ac8870e6ea34c3c9f481194e48bcdba42673570177091809f", "timestamp": "2018-03-23T12:02:31.294Z" } ] 已解决{"include":"resolve"}作为过滤器： [ { "$class": "org.acme.mynetwork.Trade", "commodity": { "$class": "org.acme.mynetwork.Commodity", "tradingSymbol": "1", "description": "werwer", "mainExchange": "wrrewer", "quantity": 10, "owner": { "$class": "org.acme.mynetwork.Trader", "tradeId": "2", "firstName": "tes2t", "lastName": "test" } }, "newOwner": { "$class": "org.acme.mynetwork.Trader", "tradeId": "2", "firstName": "tes2t", "lastName": "test" }, "transactionId": "354dca97fc6ac00aabbd923883e3ec2a3d09b8c75a54a8f536a88b6df31e8a0f", "timestamp": "2018-03-23T12:02:11.228Z" }, { "$class": "org.acme.mynetwork.Trade", "commodity": { "$class": "org.acme.mynetwork.Commodity", "tradingSymbol": "2", "description": "Ut fugiat.", "mainExchange": "ACE2", "quantity": 10, "owner": { "$class": "org.acme.mynetwork.Trader", "tradeId": "1", "firstName": "test", "lastName": "test" } }, "newOwner": { "$class": "org.acme.mynetwork.Trader", "tradeId": "1", "firstName": "test", "lastName": "test" }, "transactionId": "9da43acca718633ac8870e6ea34c3c9f481194e48bcdba42673570177091809f", "timestamp": "2018-03-23T12:02:31.294Z" } ]

TransactionRegistry和Historian之间有什么区别？

2 个答案: