使用 LinearStateQueryCriteria 时，如何获取按修改顺序排序的查询输出

Question

当使用 LinearStateQueryCriteria 时，

假设我有以下状态都具有相同的 linearId，

S4 (unconsumed) created at t4 
S3 (consumed)   created at t3
S2 (consumed)   created at t2
S1 (consumed)   created at t1

如何检索 StateStatus = CONSUMED 的最新状态？是否可以按某个时间戳对结果列表进行排序？

Answer 1

应该可以通过使用 status = Vault.StateStatus.CONSUMED 然后在 queryBy

中指定排序

val queryService = VaultQueryService<YourModelStateClass>
val criteria = QueryCriteria.LinearStateQueryCriteria(status = Vault.StateStatus.CONSUMED)
queryService.queryBy(
            criteria = criteria,
            sorting = Sort(
              setOf(
                Sort.SortColumn(
                  SortAttribute.Custom(
                    YourModelStateSchema::class.java,
                    YourModelStateSchema::updatedDatetime.name), 
                  Sort.Direction.DESC
                )
              )
            )
          )

Answer 2

您可以尝试为 vaultQueryBy 函数指定排序条件，例如：

 val sortAttribute = SortAttribute.Standard(Sort.VaultStateAttribute.RECORDED_TIME)
    val criteria = QueryCriteria.VaultQueryCriteria(stateRefs = listOf(stateRefs.first(), stateRefs.last()))
  val results = rpcOps.vaultQueryBy<IOUState>(criteria, sorting = Sort(setOf(Sort.SortColumn(sortAttribute, Sort.Direction.ASC))))

使用 LinearStateQueryCriteria 时，如何获取按修改顺序排序的查询输出

When using LinearStateQueryCriteria, How to get the output of the query sorted in order of modification

kotlin

corda