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但最后,還是根據(jù)具體的 情況去使用它。 ,功能是很強的。 這方法也能通過申明將一個 Web 的頁面類型很簡單的轉(zhuǎn)換成為另一種類型。 當意識到使用時必須知道數(shù)據(jù)類型并且要隨著應(yīng)用而發(fā)生改變時,就會覺得使用,不是很方便。此外, DataItem 的 ItemIndex 屬性用來顯示一數(shù)字。 你能在 Page頁上使用如下句法使用特殊的的數(shù)值 ( 屬性值,方法返回值,等等 ): %=數(shù)值 % 在列表 A 中的 C代碼是用 技術(shù)實現(xiàn)的數(shù)據(jù)捆綁。 asp: ListBox id=lstValues”datasource=39。 注意到基本的句法同樣,但是當數(shù)值被返回和返回 值被改變成為適當?shù)臄?shù)據(jù)類型時,它就發(fā)生變化了。 % % 數(shù)據(jù)源的具體的串值被返回。 因此,如果你處理一個整型數(shù)組, DataItem 的數(shù)據(jù)類型則是整型。 這主要包括在頁面上顯示數(shù)值或者是控件的屬 性值。 所有數(shù)據(jù)捆綁的表達式,不論是將它們放置在哪,都必須包含在 %和 % 標志之間。 這種表達方式允許你把控件很容易地綁定到數(shù)據(jù)源,連同屬性,語法,結(jié)果值同時在方法調(diào)用時在頁面中顯示。 it works hard to figure out the details of the field identified in the expression and displays it accordingly. It has the following syntax: (, field name, optional formatting) Using this syntax, you could rewrite the first example to use to look like the C code in Listing C. Listing D contains the equivalent code. The approach is great as it pushes work to the system. On the other hand, you should use it with caution, since time and resources are consumed as the system locates the element and determines its object/data type. Plenty of options Data binding makes it relatively simple to include data in pages. There are various data binding options available, which include: binding the data to a control and allowing it to decide how it is presented, or choosing declarative data binding to control presentation within the page. In the end, it es down to your preference, but it is great to have options. 中文一譯文: 數(shù)據(jù)捆綁技術(shù) 在我的項目中 , 我需要從數(shù)據(jù)庫顯示數(shù)據(jù) , 因此我使用數(shù)據(jù)捆綁的技術(shù) 它是由微軟公司支持的。% propertyName %39。s discuss it together. If you are familiar with classic ASP, the declarative data binding syntax introduced in will be familiar to you even though the functionality is vastly different. Data binding expressions are the code you see between % and % characters in an ASPX file. The expressions allow you to easily bind controls to data sources, as well as properties, expressions, and results from method calls exposed by the page. While this feature is easy to use, it often causes some confusion about what is allowed and whether it should be employed. Data binding basics Data binding expressions link page properties, server control properties, and data sources when the page39。 } } } 實踐證明 , 在數(shù)據(jù)庫要求不高、動態(tài)數(shù)據(jù)較少的校園地理信息展示方面 , 這是一種切實可行、開發(fā)容易、成本低廉的方法。 i。 for (j=0。 //裝載地圖 function initMap () { () 。 y = Geo_y。 layers = new Array () 。 二、數(shù)據(jù)庫連接訪問 訪問 SQL SERVER 數(shù)據(jù)庫的實例分析 [ 摘要 ] 隨著分布式數(shù)據(jù)庫應(yīng)用的深入 , 永久的數(shù)據(jù)庫聯(lián)接是相當耗費資源的。 DataAdapter 對象 : 通過 DataAdapter 對象建立、初始化數(shù)據(jù)表 , 從而和 DataSet 對象結(jié)合起來在內(nèi)存中存放數(shù)據(jù)。 DataView 對象 : DataView 對象代表一個 DataTable 的數(shù)據(jù)查看方式 , 數(shù)據(jù)默認的 查看方式是將數(shù)據(jù)以表格的形式排列 , 且數(shù)據(jù)排列的順序遵循從數(shù)據(jù)庫數(shù)據(jù)表中取出數(shù)據(jù)時行排列的順序 , 通常和設(shè)計數(shù)據(jù)庫時的 Sort Order 或在查詢字符串中指明排序的欄位、 升降冪有關(guān)。 DataReader 對象 : 當以瀏覽的方式查看大量數(shù)據(jù)的時候 ,會占用大量內(nèi)存 , 導(dǎo)致性能下降。在 DataSet 中可以包含任意數(shù)量的 DataTable, 且每個 DataTable 對應(yīng)一個數(shù)據(jù)庫的 Table 或 View。 一、 的主要對象 中有很多對象與 ADO 中的對象功能相似 , 但 中對象的功能更強大。 } } } III. The practice of concluding remarks proves , in database the campus geography information that doesn39。i。 for(j=0。 } //create object Map = new FlashMap( stagewidth, stagehight, Mapx, Mapy)。 x=Geo_x。s initial state and current state, with the concurrent that solves database visit problem. reduce the pressure of being away from line to join pattern decreasing for data server. DataReader object: When looking over mass data with the way that glanced over , it will occupy plenty of memories and cause performance to drop.