[System.ComponentModel.Browsable(false)] public string ToTraceString (); 返回 String 一个string,表示查询对数据源执行的命令。 属性 BrowsableAttribute 示例 C# 复制 int productID = 900; using (AdventureWorksEntities context = new AdventureWorksEntities()) { // Define the object query for the spec...
QN.uri.toQueryString(obj) 将数据对象转换成 query string。 varqueryStr = QN.uri.toQueryString({ x:1, y:2, });console.log(queryStr)//x=1&y=2 QN.uri.parseQueryString(str) 将query string 转换成 数据对象。 varqueryObj = QN.uri.parseQueryString('x=1&y=2');console.log(JSON.stringify(...
ObjectQuery<string> query = edm.CreateQuery<string>(esql); query = query.Distinct(); foreach (string c in query) { Console.WriteLine("City {0}", c); } } > Except:返回两个查询的差集。实例代码如下: using (var edm = new NorthwindEntities()) { string esql1 = "select value c from ...
();// Execute the query and display information for each item// in the orders that belong to the first contact.foreach(SalesOrderHeader orderincontact .SalesOrderHeaders) { Console.WriteLine(String.Format("PO Number: {0}", order.PurchaseOrderNumber)); Console.WriteLine(String.Format("Order ...
ObjectQuery<T>.Where(String, ObjectParameter[]) Method Reference Feedback Definition Namespace: System.Data.Objects Assembly: System.Data.Entity.dll Limits the query to results that match specified filtering criteria. C# publicSystem.Data.Objects.ObjectQuery<T>Where(stringpredicate,paramsSystem.Data.Ob...
to perform destructive modifications on the original object. Direct Object 'get' Accessor The query string object returned contains the keys of the query string through a method named 'get' (e.g. $.query.get(keypath)). Originally, they were also available through $.query[key] as well, but...
ObjectQuery<T> 經常是實體類型,但它也可以是 DbDataRecord 類型、匿名型別或基本類型的投影,例如整數或字串。 如需詳細資訊,請參閱 物件查詢。建構函式 展開資料表 ObjectQuery<T>(String, ObjectContext) 使用指定的 Entity SQL 命令作為初始查詢,建立新的 ObjectQuery<T> 實例。 ObjectQuery<T>(String, ...
asyncfunctionqueryDocumentsWithObjectId(db){constcollection=db.collection("mycollection");constdocuments=awaitcollection.find({_id:{$exists:true}}).toArray();console.log("Documents with ObjectId:",documents);// 在这里执行下一步骤}queryDocumentsWithObjectId(db); ...
ObjectQuery<T> Where (string predicate, params System.Data.Entity.Core.Objects.ObjectParameter[] parameters); 参数 predicate String 筛选谓词。 parameters ObjectParameter[] 此方法中使用的零个或多个参数。 返回 ObjectQuery<T> 一个新的 ObjectQuery<T> 实例,等效于应用了 WHERE 的原始实例。 例外 ...
OrderBy(String, ObjectParameter[]) Orders the query results by the specified criteria. Select(String, ObjectParameter[]) Limits the query results to only the properties that are defined in the specified projection. SelectValue<TResultType>(String, ObjectParameter[]) Limits the query results to...