菜鸟学习ado.net(三)

这次是dataset从多个表中获得数据和dataset数据写入xml还有dataset获取xml数据。下面是一个省市查询，省名和市名放在两个表中。

using System.Collections.Generic;


using System.Linq;


using System.Text;


using System.Data.SqlClient;


using System.Configuration;


using System.Data;


namespace 省市查询


{


class Program


{


static void Main(string[] args)


{


string connString = ConfigurationManager.ConnectionStrings["ConString"].ConnectionString;//获取配置文件App.config的连接字符串


using (SqlConnection conn = new SqlConnection(connString))


{


SqlDataAdapter thisDataAdapter = new SqlDataAdapter("select proID,proName from promary",conn);//建立Adapter对象


SqlCommandBuilder thisBuild = new SqlCommandBuilder(thisDataAdapter);//建立commandBuild对象


DataSet thisDataSet = new DataSet();//创建DataSet


//创建sqlDataAdapter来填充thisDataSet


SqlDataAdapter proAdapter = new SqlDataAdapter("select * from promary",conn);


SqlDataAdapter cityAdapter = new SqlDataAdapter("select * from city",conn);


proAdapter.Fill(thisDataSet,"promary");


cityAdapter.Fill(thisDataSet,"city");


DataRelation promcity = thisDataSet.Relations.Add("promcity", thisDataSet.Tables["promary"].Columns["proID"],thisDataSet.Tables["city"].Columns["proID"]);


foreach (DataRow proRow in thisDataSet.Tables["promary"].Rows)


{


Console.WriteLine("省/地区："+proRow["proName"]);


foreach (DataRow city in proRow.GetChildRows(promcity))


{


Console.WriteLine(" 市级："+city["cityName"]);


}




}




Console.ReadLine();








}




}


}


}

执行结果：

下面是dataset数据写入xml中

using System;


using System.Collections.Generic;


using System.Linq;


using System.Text;


using System.Data.SqlClient;


using System.Configuration;


using System.Data;




namespace 省市查询


{


class Program


{


static void Main(string[] args)


{


string connString = ConfigurationManager.ConnectionStrings["ConString"].ConnectionString;//获取配置文件App.config的连接字符串


using (SqlConnection conn = new SqlConnection(connString))


{


SqlDataAdapter thisDataAdapter = new SqlDataAdapter("select proID,proName from promary", conn);//建立Adapter对象


SqlCommandBuilder thisBuild = new SqlCommandBuilder(thisDataAdapter);//建立commandBuild对象


DataSet thisDataSet = new DataSet();//创建DataSet


//创建sqlDataAdapter来填充thisDataSet


SqlDataAdapter proAdapter = new SqlDataAdapter("select * from promary", conn);


SqlDataAdapter cityAdapter = new SqlDataAdapter("select * from city", conn);


proAdapter.Fill(thisDataSet, "promary");


cityAdapter.Fill(thisDataSet, "city");


DataRelation promcity = thisDataSet.Relations.Add("promcity", thisDataSet.Tables["promary"].Columns["proID"], thisDataSet.Tables["city"].Columns["proID"]);


promcity.Nested = true;


thisDataSet.WriteXml(@"E:\net学习资料\我的程序\省市查询\写入xml\XMLFile.xml");


Console.WriteLine("数据写入完成！");


Console.ReadLine();








}




}


}


}执行结果：

下面是dataset获取xml数据

using System;


using System.Collections.Generic;


using System.Linq;


using System.Text;


using System.Data;




namespace 读入xml到DataSet


{


class Program


{


static void Main(string[] args)


{


DataSet thisDataSet = new DataSet();


thisDataSet.ReadXml(@"E:\net学习资料\我的程序\省市查询\写入xml\XMLFile.xml");


foreach (DataRow cutRow in thisDataSet.Tables["promary"].Rows)


{


Console.WriteLine("省/市:"+cutRow["proName"]+" 省/市ID:"+cutRow["proID"]);




}


Console.ReadLine();


}


}


}