Question

如何使用SqlDataReader连接到asp.net中的多个数据库？

假设我有两个数据库，例如“Product”和“people”。产品数据库有两个表，比如table1和表2，而人们有两个表，让我们再说一次table1和table2。我想从Product.table1获取一些信息，并从people.table2获取一些信息。

我尝试使用以下代码，但不幸的是它不起作用：

    SqlConnection con1 = new SqlConnection("Data Source=(LocalDB)\\v11.0;AttachDbFilename=|DataDirectory|\\Product.mdf;Integrated Security=True");
    SqlConnection con2 = new SqlConnection("Data Source=(LocalDB)\\v11.0;AttachDbFilename=|DataDirectory|\\People.mdf;Integrated Security=True");

    SqlCommand cmd1 = new SqlCommand("select prod_name, prod_price from product_tbl", con1);
    SqlCommand cmd2 = new SqlCommand("select std_name from student_tbl", con2);

    con1.Open();
    con2.Open();

    SqlDataReader dr1 = cmd1.ExecuteReader();
    SqlDataReader dr2 = cmd2.ExecuteReader();

   // GridView1.DataSource =  How to do it??
    GridView1.DataBind();

Answer 1

您可以按照以下方式执行此操作：

从dataset1
从dataset2中的人员DB中检索结果
使用DataSet.Merge方法合并单个数据集中的两个数据集，例如dsProductPeople
将dsProductPeople绑定到网格

OR 您可以使用以下示例：

// Assumes that customerConnection is a valid SqlConnection object.
// Assumes that orderConnection is a valid OleDbConnection object.
SqlDataAdapter custAdapter = new SqlDataAdapter(
  "SELECT * FROM dbo.Customers", customerConnection);
OleDbDataAdapter ordAdapter = new OleDbDataAdapter(
  "SELECT * FROM Orders", orderConnection);

DataSet customerOrders = new DataSet();

custAdapter.Fill(customerOrders, "Customers");
ordAdapter.Fill(customerOrders, "Orders");

DataRelation relation = customerOrders.Relations.Add("CustOrders",
  customerOrders.Tables["Customers"].Columns["CustomerID"],
  customerOrders.Tables["Orders"].Columns["CustomerID"]);

foreach (DataRow pRow in customerOrders.Tables["Customers"].Rows)
{
  Console.WriteLine(pRow["CustomerID"]);
   foreach (DataRow cRow in pRow.GetChildRows(relation))
    Console.WriteLine("\t" + cRow["OrderID"]);
}

如何使用SqlDataReader连接到asp.net中的多个数据库？

1 个答案: