对两个数据库中的两个表进行联合查询 - 黑马程序员技术交流社区

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
using System.Linq;
namespace LinkTwoData
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
string strcon1 = @"Data Source=FENG-PC\SQLEXPRESS;Initial Catalog=test1;User ID=sa;PassWord=sa2008";
string strcon2 = @"Data Source=FENG-PC\SQLEXPRESS;Initial Catalog=test2;User ID=sa;PassWord=sa2008";
private void Form1_Load(object sender, EventArgs e)
{
SqlDataAdapter sda1 = new SqlDataAdapter("select * from stu1",strcon1);
SqlDataAdapter sda2 = new SqlDataAdapter("select * from stu1", strcon2);
DataSet ds = new DataSet();
sda1.Fill(ds,"stu1");
sda2.Fill(ds, "stu2");
var query = from stu in ds.Tables["stu1"].AsEnumerable()
from sc in ds.Tables["stu2"].AsEnumerable()
where stu.Field<int>("sc") == sc.Field<int>("sc")
select new
{
sno = stu.Field<int>("sno",DataRowVersion.Original),
sname=stu.Field<string>("sname",DataRowVersion.Original),
sage = stu.Field<int>("sage", DataRowVersion.Original),
scname = sc.Field<string>("scname", DataRowVersion.Original)
};
DataTable dt = new DataTable();
dt.Columns.Add("sno", typeof(int));
dt.Columns.Add("sname", typeof(string));
dt.Columns.Add("sage", typeof(string));
dt.Columns.Add("scname", typeof(string));
foreach (var item in query)
{
DataRow newRow = dt.NewRow();
newRow["sno"] = item.sno;
newRow["sname"] = item.sname;
newRow["sage"] = item.sage;
newRow["scname"] = item.scname;
dt.Rows.Add(newRow);
}
dataGridView1.DataSource = dt.DefaultView;
}
}
}

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