how to use dataset in asp net

In ASP. NET, Json data is converted to ADO. NET DataSet object, jsonado.net There are many methods to convert Json data to ADO. NET DataSet. Newtonsoft. Json also provides DataSet Conve

How is ASP. NET dataset (. xsd) used? Then, let's start our demonstration: Datasets (. xsd) can be visualized to complete the compilation of all database operation functions, that is, complete all the contents of the DAL layer, which is very convenient. Next let's see how to use it:

The dataset class is the main component of the ADO. Net object model. The ADO. Net container class has nothing to do with the data source used and does not store any information related to the specific data source. DataSet object The DataSet object implements three important

We have already discussed how to operate databases, but almost all of them are done through oledbcommand and oledbdatareader. This time we will talk about how to operate databases through oledbdataadapter! We have already discussed the use of oledbdataadapter before. Because oledbdataadapter is a bridge between dataset and the data source, dataset is used to stor

(); } PrivateDataTable Createdatatable () {DataTable dt=NewDataTable (); Dt. Columns.Add ("ProductCode",typeof(string)); Dt. Columns.Add ("saledate",typeof(DateTime)); Dt. Columns.Add ("SaleAmount",typeof(Double)); DataRow Dr=dt. NewRow (); dr["ProductCode"] ="0001"; dr["saledate"] = Convert.todatetime ("2009-2-1"); dr["SaleAmount"] = +; Dt. Rows.Add (DR); Dr=dt. NewRow (); dr["ProductCode"] ="0001"; dr["saledate"] = Convert.todatetime ("2009-1-1"); dr["SaleAmount"] = -;

public class Jsonutil{public string ToJson (DataSet dataset){String jsonstring = "{";foreach (DataTable table in Dataset.tables){Jsonstring + = "" "+ table. TableName + "" ":" + ToJson (table) + ",";}jsonstring = Jsonstring.trimend (', ');return jsonstring + "}";}public string ToJson (DataTable dt){StringBuilder jsonstring = new StringBuilder ();Jsonstring.append ("[");DataRowCollection DRC = dt. Rows;for (

OleDbParameter("@GG",OleDbType.VarChar));//遍历DataSet将数据插入新建的Excel文件中foreach (DataRow row in dsBZDM.Tables[0].Rows){ for (int i=0; i{objCmd.Parameters[i].Value = row[i];}objCmd.ExecuteNonQuery();}objCmd.Connection.Close();//提供下载//清除临时文件HttpResponse response = HttpContext.Current.Response;response.Clear();//为输出作准备response.WriteFile(urlPath + fileName);string httpHeader="attachment;filename=KCMX.Xls";response.AppendHeader("Content-Disposition", httpHead

1. routes in ASP. NET mvc3 This article does not introduce too much theoretical knowledge, as we can see in the global. asax. CS file:Code: Routes. maproute ("default", // route name "{controller}/{action}/{ID}", // URL with parameters new {controller = "home ", action = "Index", id = urlparameter. optional} // parameter defaults ); Below we mimic the above to complete a route we will

Method:public static string Getjsonbydataset (DataSet ds){if (ds = = null | | ds. Tables.count {return null;}StringBuilder sb = new StringBuilder ();foreach (DataTable dt in DS. Tables){Sb. Append (String. Format ("["));foreach (DataRow dr in Dt. Rows){Sb. Append ("{");for (int i = 0; i {Sb. AppendFormat ("\" {0}\ ": \" {1}\ ",", Dr. Table.columns[i]. ColumnName, Dr[i]. ToString ());}Sb. Remove (sb.) ToString (). LastIndexOf (', '), 1);Sb. Append ("},

stringCreatejsonparameters (DataTable DT,intCount =0) { if(dt = =NULL|| Dt. Rows.Count = =0) { returnNulldata; } if(Count = =0) {Count=dt. Rows.Count; } BOOLresult =true; StringBuilder jsonstring=NewStringBuilder (); //Exception Handling if(dt! =NULL dt. Rows.Count >0) {jsonstring.append ("{ "); Jsonstring.append ("\ "Result\":"+ result +","+"rows:"+ Count +","+"msg:["); for(inti =0; i ) {jsonstring.append

Use oledb in. Net to export dataset data to an Excel file Function Description: // DT is the data source (data table) // Excelfilename is the excle file to be exported. // Modelfile is a template file, which is consistent with the table in the data source. Otherwise, the Data fails to be exported. // In the modelfile file, you must have a table consistent with DT

) defined by the architecture, this WSDL will be useless. The problem persists: Can I use. Net remoting to create a web service? Yes, strictly speaking, yes. But can users who do not use the. NET remoting pipeline use them? The answer is: Maybe you can, if you are careful to

AbstractMany people say that C ++ cannot develop ASP. net, ansi c ++ is true, but C ++/CLI is acceptable. In fact, any. net can be used to develop ASP. net, although Visual Studio 2005 is not supported, you can still use what you

How to correctly use sessions in ASP. NET, asp. netsession The Session object is used to store the information required by a user to access a specific aspx page from the moment the user leaves. When you switch the page of an application, the variables of the Session object are not cleared.For a Web Application, the con

for our contriller, Model) and view to generate the initial code and content. If you are familiar with ASP or ASP. net, you will be very easy to access ASP. net MVC, Asp. the view part of the

Install Asp. Net in Mac OS and use Yeoman to create an Asp. Net project, yeomanasp.net This article is a summary of the problems encountered during installation of Installing ASP. NET 5

ASP. NET Core Chinese Document Chapter 2 Guide (2) Use Visual Studio, ASP. NET, corestudio Reference page: Http://www.yuanjiaocheng.net/ASPNET-CORE/project-layout.html Http://www.yuanjiaocheng.net/ASPNET-CORE/projectjson.html Http://www.yuanjiaocheng.net/ASPNET-CORE/core-con

Install ASP. Net in Mac OS and use Yeoman to create an ASP. Net Project This article is a summary of the problems encountered during installation of Installing ASP. NET 5 On Mac OS. The

I am currently involved in a multilingual, multi-culture web-based project.To meet the needs of English, German, French, and other different languages and cultures.The database must meet both Oracle and MSSQL requirements.Although we use ASP. NET, I don't think it is an authentic ASP. NETWe only

The dataset stores data in the disconnected cache. The structure of a dataset is similar to that of a relational database. It exposes hierarchical object models of tables, rows, and columns. In addition, it contains the constraints and relationships defined for the dataset.Source: http://msdn.microsoft.com/library/chs/default.asp? Url =/library/CHS/vbcon/html/vbcondatasets.