Question

如何为数组概念中的属性编写查询。示例：根据城市属性获取地址。

namespace org.sample.basic

participant User identified by userId{
    o String userId
    o Address[] address optional

}

concept Address {
    o String address1
    o String address2
    o String city
    o String state
    o Integer zipcode
    o String country 
    o Boolean isAddressValidated default = false 
}

Answer 1

给出的数据：

{ "$class": "org.sample.basic.User", "userId": "id1", "address": [ { $class": "org.sample.basic.Address", "address1": "the-vines", "city": "newyork" }, { $class": "org.sample.basic.Address", "address1": "the-gables", "city": "dallas" } ] }  // and so on

您的querydef（并非在所有字段中都列出）：

query myquery { 
  description: "Select all x" statement: 
   SELECT org.sample.basic.User 
  WHERE (address CONTAINS (city == "dallas") OR (city == "newyork") ) 
}

Answer 2

希望您使用的是Hyperledger查询语言。你可以尝试这样的事情吗？

SELECT org.sample.basic.User  
      WHERE ( address CONTAINS (city== _$city) )

在Composer中查询数组概念

2 个答案: