queryResponse.Value不显示queryAllProducts方法的结果..仅显示queryResponse.Key

I'm working on hyperledger fabric ... I want to develop a app like fabcar but want to compile through go..invoke methods are working perfectly but query commands not displaying results.

func (t *SimpleChaincode) queryAllProducts(stub shim.ChaincodeStubInterface) pb.Response {
fmt.Println("Inside queryAllProducts method of barcode Application ")

startKey := "PRODUCT0"
endKey := "PRODUCT999"

resultsIterator, err := stub.GetStateByRange(startKey, endKey)
if err != nil {
    return shim.Error(err.Error())
}
defer resultsIterator.Close()

// buffer is a JSON array containing QueryResults
var buffer bytes.Buffer
buffer.WriteString("[")

bArrayMemberAlreadyWritten := false
for resultsIterator.HasNext() {
    queryResponse, err := resultsIterator.Next()
    if err != nil {
        return shim.Error(err.Error())
    }
    // Add a comma before array members, suppress it for the first array member
    if bArrayMemberAlreadyWritten == true {
        buffer.WriteString(",")
    }
    buffer.WriteString("{\"Key\":")
    buffer.WriteString("\"")
    buffer.WriteString(queryResponse.Key)
    buffer.WriteString("\"")

    buffer.WriteString(", \"Record\":")
    // Record is a JSON object, so we write as-is
    buffer.WriteString(string(queryResponse.Value))
    buffer.WriteString("}")
    bArrayMemberAlreadyWritten = true
}
buffer.WriteString("]")

fmt.Printf("- queryAllProducts:
%s
", buffer.String())

return shim.Success(buffer.Bytes())
}

getting output like this ..unable to get records

[{"Key":"PRODUCT0", "Record":{}},{"Key":"PRODUCT1", "Record":{}}, 
 {"Key":"PRODUCT2", "Record":{}},{"Key":"PRODUCT3", "Record":{}}]

expected output is like in this format

[{"Key":"CAR0", "Record": 
{"colour":"blue","make":"Toyota","model":"Prius","owner":"Tomoko"}},
{"Key":"CAR1", "Record": 
{"colour":"red","make":"Ford","model":"Mustang","owner":"Brad"}}]