What Is Hyperledger Composer Query File (*.qry)?

A Hyperledger Composer Query file is a source code file that define queries to retrieve business objects from the Business Network.

A access control file uses the Query language and the .qry file extension. Here is an example of an query file from the Fund Clearing Network, queries.qry:

/**
 * Queries for Fund Clearing
 */
query TransferRequestsByBankInState {
    description: "Select all TransferRequests for a participating bank in a given state"
    statement:
        SELECT org.clearing.TransferRequest
            WHERE (fromBank == _$bank)
}

query TransferRequestsByBanksInState {
    description: "Select all TransferRequests for a participating bank in a given state"
    statement:
        SELECT org.clearing.TransferRequest
            WHERE ((fromBank == _$bank1 AND toBank == _$bank2 AND state == _$state) OR (fromBank == _$bank2 AND toBank == _$bank1 AND state == _$state))
}

query BatchTransferRequestById {
    description: "Select a BatchTransferRequest by the UUID"
    statement:
        SELECT org.clearing.BatchTransferRequest
            WHERE (_$batchId == batchId)
}

query BatchTransferRequestsByBankInState {
    description: "Select all BatchTransferRequests in a given state for a participating bank"
    statement:
        SELECT org.clearing.BatchTransferRequest
            WHERE ((parties CONTAINS _$party) AND (state == _$state))
}

query BatchTransferRequestForBanksInState {
    description: "Select all BatchTransferRequests in a given state for two participating banks"
    statement:
        SELECT org.clearing.BatchTransferRequest
            WHERE ((parties CONTAINS [_$bank1, _$bank2]) AND (state == _$state))
}

 

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