// Rich queries pass a query string to the state database. Let’s start with a simple query to find all Car objects. function sends the query to our Hyperledger Fabric network and returns a result array. The CouchDB support also allows you to deploy indexes with your chaincode to make queries more efficient and enable you to … The username and password properties should be populated with an admin username and password if CouchDB is configured with a username and … This means that only permitted users can query (access to information) or invoke (create a new transaction) a transaction on a granted channel. , if you are new to this tutorial, make sure to check out the ‘Boilerplate setup’ section in the first article to get up and running. A community of blockchain experts to help. Next, open the ‘Run a Query with Mango’ link in order to execute our first query. But as a JSON document store, CouchDB additionally enables rich query against the chaincode data, when chaincode values (e.g. The query string is in the native syntax // of the underlying state database. The responses to rich queries are useful for understanding the data on the ledger. and execute the docker exec command that runs the. GetQueryResult(query string) (StateQueryIteratorInterface, error) // GetQueryResultWithPagination performs a "rich" query against a state database. Nice blog. This has been found when running benchmarks on a RHEL7 server, using Caliper clients, driving a benchmark that is query heavy. It’s even possible to query for subdocuments. Make sure you have a copy of the code which can be found on, Github michielmulders/hyperledger-fabric-blockgeeks, to create a local clone of the repository on your machine and checkout the second part of the tutorial with. More specifically, Hyperledger Fabric is a permissioned blockchain network. A ledger contains many transactions in it. All Hyperledger Fabric service plans use a CouchDB as state database. (channel name combined with chaincode name) database and explore the car objects inside it. Hyperledger Explorer setup that may be launched by students to get a graphical view of the network Provides easy to use tools/scripts so that developers can focus on learning Chaincode development Sections start by going over the concepts. // The query string is in the syntax of the underlying state database. Blockchain module that can listen, and query a Hyperledger Fabric network. LevelDB is the default key/value state database which stores values as binary data. In a performance test using CouchDB, GetState by primary key can get 200 TPS, but rich query on an indexed field gets only 7 TPS. assets) are modeled as JSON data. Once your Hyperledger Fabric network has started. Using SQL for rich queries in Smart Contracts; Data Backup/Recovery ... while also achieving more than 2000 TPS. Ok, let’s say for example we want to skip the first result and limit the result to two cars so we only have the two violet cars of the previous example. The query will return three car objects, one of color ‘purple’ and two of color ‘violet’. This object store holds binary data which can be queried using its key. This data is stored as a series of key-value pairs, and you can query for the value of a single key, multiple keys, or – if the ledger is written in a rich data storage format like JSON – perform complex searches against it (looking for all assets that contain certain keywords, for example). As a result, you should not use a rich query and update the channel ledger in a single transaction. See: CouchDB.org documentation Again, let’s query for all car objects in our database using a rich query. It enables you to pass an array of possible values you want to match. 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