我是ArcGIS的新手.
我想直接在地图上画一些点和一些文字.
类似下面的东西.但它只是显示地图而没有画任何东西.
有人可以帮我解决这个问题吗？
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>Draw point and text</title>
<link rel="stylesheet" type="text/css" href="http://serverapi.arcgisonline.com/jsapi/arcgis/3.1/js/dojo/dijit/themes/tundra/tundra.css">
<script type="text/javascript" src="http://serverapi.arcgisonline.com/jsapi/arcgis?v=3.1"></script>
<script type="text/javascript">
dojo.require("esri.map");
dojo.require("esri.layers.agsdynamic");
var map;
var layer;
var mapUrl;
var defaultSymbol;
function Init()
{
map = new esri.Map("mapDiv");
mapUrl = "http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Demographics/ESRI_Population_World/MapServer";
//mapUrl = "http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Specialty/ESRI_StatesCitiesRivers_USA/MapServer";
layer = new esri.layers.ArcGISDynamicMapServiceLayer(mapUrl);
map.addLayer(layer);
defaultSymbol = new esri.symbol.SimpleMarkerSymbol(); // point
defaultSymbol.setColor(new dojo.Color([255, 0, 0]));
addPoint(10, 10);
addText(10, 20, "Text");
}
function addPoint(x, y)
{
var pt = new esri.geometry.Point(x, y, map.spatialReference); …我有一个oracle数据库表:
CREATE TABLE "DogInfo" (
"Id" NUMBER NOT NULL ENABLE,
"DogName" VARCHAR2 (50 CHAR) NOT NULL ENABLE,
"DogAge" NUMBER NOT NULL ENABLE,
CONSTRAINT "DogInfo_PK" PRIMARY KEY ("Id") ENABLE
);
CREATE SEQUENCE "DOGINFO_SEQ" MINVALUE 1 MAXVALUE 999999999999999999999999999 INCREMENT BY 1 START WITH 1 CACHE 20 NOORDER NOCYCLE;
CREATE OR REPLACE TRIGGER "BI_DogInfo"
BEFORE INSERT ON "DogInfo" FOR EACH ROW
WHEN (NEW."Id" IS NULL OR NEW."Id" = 0) BEGIN
SELECT "USERINFO_SEQ".nextval INTO :NEW."Id" FROM dual;
END;
ALTER TRIGGER "BI_DogInfo" ENABLE;
如果我使用数据库工具将20条记录插入表中,然后使用我的C#Web应用程序插入记录,则dog id将以1开头,而不是21. …
这是一个非常简单的代码,但它无法捕获错误.
或者如何捕获错误？
谢谢.
BEGIN TRY
ALTER TABLE [dbo].[my_table_name]
ADD PRIMARY KEY ([id]);
END TRY
BEGIN CATCH
PRINT 'Primary Key already exists. '
END CATCH