【正文】 QL Server or Oracle. In DataSet, it can contain arbitrary quantity of DataTable, and every DataTable is in correspondence with Table or View in darabase. Generally speaking,a corresponding DataTable is a set of a group of DataRow and DataColumn for the data sheet of can take the responsibility for defending each data trip to retain it39。s data architecture which doesn39。 stageWidth=width。 Map_mc=(Map_mc,0)。} The information inquiry of the map datas:The inquiry of datais was mainly carried out by the click of mouse and the choose of frame on the flash which is loaded with the line,the point and the side of layer .We can see whether the field of the mouse choosing contain the object data through querying the courrent layer of the picture ,if exiting,to return the inquiry result in the new Form simplyand show it to the user. The code of the script of mouse option: Function select ( ) { var selectedRegion: Array。 j++){var coverLayer:MapLayer= [j]。 if((,)){(coverLayer)。作為一種數(shù)據(jù)庫訪問框架 , 能處理當(dāng)今 N 層的 Web 應(yīng)用程序所要求的非連接數(shù)據(jù)體系結(jié)構(gòu) , 因而在訪問 SQL SERVER數(shù)據(jù)庫時(shí) , 性能優(yōu)越 , 得到了廣泛應(yīng)用。 DataSet 對象 : DataSet 是 的核心 , 是專門用來處理從數(shù)據(jù)存儲中讀出的數(shù)據(jù) , 并以離線方式存在于本地內(nèi)存中。 DataTable 會負(fù)責(zé)維護(hù)每一筆數(shù)據(jù)行保留它的初始狀態(tài)和當(dāng)前的狀態(tài) , 以解決數(shù)據(jù)庫的 并發(fā)訪問問題。如果有多個(gè)用戶在同一時(shí)間對同一計(jì)算機(jī)進(jìn)行同樣的操作 , 則機(jī)器內(nèi)存將被過度使用。例如 , 可以建立一個(gè) DataView 對象 ,然后指定和以缺省的查看 (DefaultView) 不同的排序方式 , 或者也 可以使用條件過濾 (Filter) 只查看數(shù)據(jù)表中的部分?jǐn)?shù)據(jù) 。 DataAdapter 對象允許將 DataSet 對象中的數(shù)據(jù)保存到數(shù)據(jù)來源 (DataSource) , 也可以從數(shù)據(jù)來源取出數(shù)據(jù)。本文討論了 的主要對象 , 并深入分析了其訪問 SQL SERVER 的過程。 stageHeight = height。 ( Map_mc , 200) 。鼠標(biāo)選擇的腳本代碼為 : function select () { var selectedRegion:Array。 j++) { var coverLayer:MapLayer = [j] 。 if ( ( , ) ) { (coverLayer) 。這種網(wǎng)絡(luò)電子地圖的展示效果是傳統(tǒng) GIS 軟件很難達(dá)到的 , 在校園地理位置展示和建筑小區(qū)展示等領(lǐng)域這種方法具有較大的發(fā)展?jié)摿Αe dealing with an array of integers, the DataItem will be an integer. The following list provides a quick review of the syntax for various scenarios: % %An array of string values is returned. % (expression) %The specific field from a DataView container is returned. % %The specific string property value of data source is returned. % CStr() %Returns a property value converted to its string representation. When you39。s window title is populated using a method call. In addition, the ItemIndex property of the DataItem is used to display a row number. The ItemIndex property begins with zero, so one is added before it is displayed. Listing B contains the equivalent code. The main difference is the use of parentheses as opposed to brackets in C. Also, the casting of the rows is not necessary with . Using the object can be tedious, since you must be aware of the data type and convert it accordingly for use. Microsoft does provide the DataBinder class to further simplify development. Microsoft documentation (on MSDN) states the DataBinder class uses reflection to parse and evaluate a data binding expression against an object at runtime. This method allows RAD designers, such as Visual Studio .NET, to easily generate and parse data binding syntax. This method can also be used declaratively on a Web form39。 如果你熟悉經(jīng)典 ASP，在 同。 數(shù)據(jù)捆綁的基本原則： 當(dāng) DataBind方法被調(diào)用時(shí)，數(shù)據(jù)就捆綁到 ，數(shù)據(jù)源。盡管如此，只要返回一個(gè)數(shù)值，這個(gè)數(shù)值表達(dá)式就被調(diào)用了。它指向數(shù)據(jù)源處的一個(gè)數(shù)據(jù)項(xiàng)目如表中的一個(gè)數(shù)據(jù)行或者是列表中的某個(gè)元素的值。 % % 串價(jià)值的一個(gè)陣列被返回。 當(dāng)你使用 C時(shí)，句法是有點(diǎn)不同的。當(dāng)串值被返回時(shí)，語法結(jié)構(gòu)仍然保持不變。 % ( ) % 頁實(shí)例屬性值被顯示。 查詢的數(shù)值是通過 轉(zhuǎn)發(fā)器來控制顯示的。 主要的區(qū)別在于在 C中應(yīng)用了括號。 在系統(tǒng)運(yùn)行時(shí)，微軟文件（在 MSDN 上）申明在 DataBinder 類中將數(shù)據(jù)綁定表達(dá)式的值的數(shù)據(jù)類型強(qiáng)制轉(zhuǎn)換成實(shí)例的數(shù)值類型。 Eval方法接受以前覆蓋的 ； 它根據(jù)情況改變，根據(jù)表達(dá)式推算出字段的具體細(xì)節(jié)并且將它顯示出來。 大量的選擇 數(shù)據(jù)捆綁使得調(diào)用 頁面相關(guān)數(shù)據(jù)是變得非常