cursor

How do I can rewind a cursor of a DataReader to the beginning? With one DataReader result I need to run two while loop, but those have to be from beginning. They are two iterations in one result set running a query once. Example: dr = command.ExecuteReader(cmd); while (dr.Read()) { // do some... } // rewind cursor here while (dr.Read()) { // do another things... } I've looked into the DataReader docs and I've found nothing, so if it can't be possible with DataReader, I may change the class for one that fits this purpose. You cannot (unless you execute the command again): it is a one-way stream

ArcPy 类列表（按字母顺序） 01 Raster 创建一个可在 Python 脚本或地图代数表达式中使用的栅格对象。 02 Cursor Cursor 是一种数据访问对象，可用于在表中迭代一组行或者向表中插入新行。 03 Row 行对象表示表中的某一行。行对象会从 InsertCursor、SearchCursor 和 UpdateCursor 中返回。 04 Array 数组对象中可包含点和数组，它用于构造几何对象。 05 Point 点对象经常与光标配合使用。点要素将返回单个点对象而不是点对象数组。 06 Polyline 折线对象是由一个或多个路径定义的形状，其中路径是指一系列相连线段。 07 Polygon 面对象是指由一系列相连的 x,y 坐标对定义的闭合形状。 08 Extent 范围是在地图单位下提供左下角和右上角坐标指定的一个矩形。 序号 类名称 功能说明 语法 & 举例 01 Raster ==== <<<< Description >>>> ==== 创建一个可在 Python 脚本或地图代数表达式中使用的栅格对象。 ---------------------------------------------------------------------------------- ==== <<<< Syntax >>>> ==== Raster

01 da.SearchCursor 只读查看表或要素类数据。 02 da.InsertCursor 向表或要素类插入行。 03 da.UpdateCursor 编辑或删除表和要素类行。 04 SearchCursor 用于在要素类或表上建立只读游标。 05 InsertCursor 向要素类、shapefile 或表中插入行。 06 UpdateCursor 创建一个用于更新或删除指定要素类、shapefile 和表中的行的游标。 序号 函数名称 功能说明 语法 & 举例 以下是 arcpy.da.SearchCursor、arcpy.da.InsertCursor、arcpy.da.UpdateCursor 01 da.SearchCursor ==== <<<< Description >>>> ==== SearchCursor 用于建立从要素类或表中返回的记录的只读访问权限。 返回一组迭代的元组。元组中值的顺序与 field_names 参数指定的字段顺序相符。使用 For 循环可迭代搜索游标。 ---------------------------------------------------------------------------------- ==== <<<< Syntax >>>> ==== da.SearchCursor (in_table,

I am having trouble with cursors not being pulled through in WebKit browsers. Surprsingly IE and Opera work as I expect them to. Here's the CSS .olControlDrawFeatureActive { cursor: url(<DOMAIN>/common/images/cursors/draw.png), crosshair, default; } It quite simply changes the cursor to either the Draw png or, if it doesn't accept custom cursors or PNGs (like IE or Opera) then it should default to the crosshair. Works fine in IE and Opera, it goes to the crosshair as I want it to, FireFox, Safari and Chrome on the other hand refuse to return any css for this at all. Looking at the returned CSS

When finding a lot of documents and iterating over them using cursor.nextObject , one by one, the callback eventually returns undefined result and error MongoError: cursor killed or timed out . Whole error message is: [MongoError: cursor killed or timed out] name: 'MongoError', message: 'cursor killed or timed out' How to avoid the cursor to be killed? According to Mongodb's official doc , the optional param timeout can be set to false . db.collection('mycollection').find({}, {timeout:false}, function(err, cursor) { if (!err) { // Iterate safely on your cursor here } else { console.log(err); }

I have an application which I'm interested in eventually porting to mono so I'm trying to avoid using p/invoke's to accomplish this task. I would like to load a cursor dynamically, as in I have a Bitmap that is generated on the fly in the application. From what I can tell the safest way to do it without using p/invoke's is to create a .cur file which I can then load to a memory stream and use the Cursor(Stream) constructor. However I have no idea how to create a .cur file. I found this article on the Microsoft Knowledge Base which sort of explains the format, but I'm not sure how it can be