Question

我正在尝试获取上次创建具有各种状态代码的记录的日期。我发出此查询：

http://localhost/FTPOrdersoDataService/odata/FTP_ORDER_STATUS_LOG?$apply=groupby((STATUS), aggregate(FTP_ORDERS_ID with max as lastCreated))

返回以下错误“：

{
"error": {
"code": "",
"message": "An error has occurred.",
"innererror": {
"message": "Argument types do not match",
"type": "System.ArgumentException",
"stacktrace": "   at System.Linq.Expressions.Expression.Bind(MemberInfo member, Expression expression)\r\n   at System.Web.OData.Query.Expressions.AggregationBinder.BindSelect(IQueryable grouping)\r\n   at System.Web.OData.Query.ApplyQueryOption.ApplyTo(IQueryable query, ODataQuerySettings querySettings)\r\n   at System.Web.OData.Query.ODataQueryOptions.ApplyTo(IQueryable query, ODataQuerySettings querySettings)\r\n   at System.Web.OData.EnableQueryAttribute.ExecuteQuery(Object response, HttpRequestMessage request, HttpActionDescriptor actionDescriptor, ODataQueryContext queryContext)\r\n   at System.Web.OData.EnableQueryAttribute.OnActionExecuted(HttpActionExecutedContext actionExecutedContext)\r\n   at System.Web.Http.Filters.ActionFilterAttribute.OnActionExecutedAsync(HttpActionExecutedContext actionExecutedContext, CancellationToken cancellationToken)\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at System.Web.Http.Filters.ActionFilterAttribute.<CallOnActionExecutedAsync>d__5.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at System.Web.Http.Filters.ActionFilterAttribute.<ExecuteActionFilterAsyncCore>d__0.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at System.Web.Http.Controllers.ActionFilterResult.<ExecuteAsync>d__2.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at System.Web.Http.Dispatcher.HttpControllerDispatcher.<SendAsync>d__1.MoveNext()"
}
}
}

如果我将请求更改为：

http://localhost/FTPOrdersoDataService/odata/FTP_ORDER_STATUS_LOG?$apply=groupby((STATUS), aggregate(FTP_ORDERS_ID with max as lastCreated))

然后它正常运行，显然问题在于CREATEDDATE字段。 CREATEDDATE在Oracle中定义为TIMESTAMP（6），在我的EF模型中定义为DateTime。

是否有使max（和其他聚合函数）与日期一起工作的秘诀？

Answer 1

在Microsoft.AspNet.OData.7.4.1
中进行了测试

过去存在一些问题，但是OData实现已经发展，您现在可以使用以下查询语法将字段转换为标准EnableQueryAttribute支持的类型：

aggregate(cast(CREATEDDATE, Edm.DateTimeOffset) with max as lastCreated)

http://localhost/FTPOrdersoDataService/odata/FTP_ORDER_STATUS_LOG?$apply=groupby((STATUS), aggregate(cast(CREATEDDATE, Edm.DateTimeOffset) with max as lastCreated))

使用oData V4计算最大日期

1 个答案: