DataSet에 데이터 로드
업데이트: November 2007
DataSet 개체를 먼저 채워야 LINQ to DataSet을 사용하여 해당 개체를 쿼리할 수 있습니다. DataSet은 여러 방법으로 채울 수 있습니다. 예를 들어, LINQ to SQL를 사용하여 데이터베이스를 쿼리한 다음 그 결과를 DataSet에 로드할 수 있습니다. 자세한 내용은 LINQ to SQL을 참조하십시오.
DataSet에 데이터를 로드하는 일반적인 방법 중에는 DataAdapter 클래스를 사용하여 데이터베이스에서 데이터를 검색하는 방법도 있습니다. 다음 예제에서 이 방법을 보여 줍니다.
예제
이 예제에서는 DataAdapter를 사용하여 AdventureWorks 데이터베이스에서 2002년 판매 정보를 쿼리한 다음 그 결과를 DataSet에 로드합니다. DataSet이 채워지면 LINQ to DataSet을 사용하여 쿼리를 다시 작성할 수 있습니다. 이 예제의 FillDataSet 메서드는 LINQ to DataSet 예제의 예제 쿼리에 사용됩니다. 자세한 내용은 DataSet 쿼리(LINQ to DataSet)를 참조하십시오.
Try
Dim connectionString As String
connectionString = "Data Source=localhost;Initial Catalog=AdventureWorks;" & _
"Integrated Security=true;"
' Create a new adapter and give it a query to fetch sales order, contact,
' address, and product information for sales in the year 2002. Point connection
' information to the configuration setting "AdventureWorks".
Dim da = New SqlDataAdapter( _
"SELECT SalesOrderID, ContactID, OrderDate, OnlineOrderFlag, " & _
"TotalDue, SalesOrderNumber, Status, ShipToAddressID, BillToAddressID " & _
"FROM Sales.SalesOrderHeader " & _
"WHERE DATEPART(YEAR, OrderDate) = @year; " & _
"SELECT d.SalesOrderID, d.SalesOrderDetailID, d.OrderQty, " & _
"d.ProductID, d.UnitPrice " & _
"FROM Sales.SalesOrderDetail d " & _
"INNER JOIN Sales.SalesOrderHeader h " & _
"ON d.SalesOrderID = h.SalesOrderID " & _
"WHERE DATEPART(YEAR, OrderDate) = @year; " & _
"SELECT p.ProductID, p.Name, p.ProductNumber, p.MakeFlag, " & _
"p.Color, p.ListPrice, p.Size, p.Class, p.Style " & _
"FROM Production.Product p; " & _
"SELECT DISTINCT a.AddressID, a.AddressLine1, a.AddressLine2, " & _
"a.City, a.StateProvinceID, a.PostalCode " & _
"FROM Person.Address a " & _
"INNER JOIN Sales.SalesOrderHeader h " & _
"ON a.AddressID = h.ShipToAddressID OR a.AddressID = h.BillToAddressID " & _
"WHERE DATEPART(YEAR, OrderDate) = @year; " & _
"SELECT DISTINCT c.ContactID, c.Title, c.FirstName, " & _
"c.LastName, c.EmailAddress, c.Phone " & _
"FROM Person.Contact c " & _
"INNER JOIN Sales.SalesOrderHeader h " & _
"ON c.ContactID = h.ContactID " & _
"WHERE DATEPART(YEAR, OrderDate) = @year;", _
connectionString)
' Add table mappings.
da.SelectCommand.Parameters.AddWithValue("@year", 2002)
da.TableMappings.Add("Table", "SalesOrderHeader")
da.TableMappings.Add("Table1", "SalesOrderDetail")
da.TableMappings.Add("Table2", "Product")
da.TableMappings.Add("Table3", "Address")
da.TableMappings.Add("Table4", "Contact")
da.Fill(ds)
' Add data relations.
Dim orderHeader As DataTable = ds.Tables("SalesOrderHeader")
Dim orderDetail As DataTable = ds.Tables("SalesOrderDetail")
Dim co As DataRelation = New DataRelation("SalesOrderHeaderDetail", _
orderHeader.Columns("SalesOrderID"), _
orderDetail.Columns("SalesOrderID"), True)
ds.Relations.Add(co)
Dim contact As DataTable = ds.Tables("Contact")
Dim orderContact As DataRelation = New DataRelation("SalesOrderContact", _
contact.Columns("ContactID"), _
orderHeader.Columns("ContactID"), True)
ds.Relations.Add(orderContact)
Catch ex As SqlException
Console.WriteLine("SQL exception occurred: " & ex.Message)
End Try
try
{
// Create a new adapter and give it a query to fetch sales order, contact,
// address, and product information for sales in the year 2002. Point connection
// information to the configuration setting "AdventureWorks".
string connectionString = "Data Source=localhost;Initial Catalog=AdventureWorks;"
+ "Integrated Security=true;";
SqlDataAdapter da = new SqlDataAdapter(
"SELECT SalesOrderID, ContactID, OrderDate, OnlineOrderFlag, " +
"TotalDue, SalesOrderNumber, Status, ShipToAddressID, BillToAddressID " +
"FROM Sales.SalesOrderHeader " +
"WHERE DATEPART(YEAR, OrderDate) = @year; " +
"SELECT d.SalesOrderID, d.SalesOrderDetailID, d.OrderQty, " +
"d.ProductID, d.UnitPrice " +
"FROM Sales.SalesOrderDetail d " +
"INNER JOIN Sales.SalesOrderHeader h " +
"ON d.SalesOrderID = h.SalesOrderID " +
"WHERE DATEPART(YEAR, OrderDate) = @year; " +
"SELECT p.ProductID, p.Name, p.ProductNumber, p.MakeFlag, " +
"p.Color, p.ListPrice, p.Size, p.Class, p.Style, p.Weight " +
"FROM Production.Product p; " +
"SELECT DISTINCT a.AddressID, a.AddressLine1, a.AddressLine2, " +
"a.City, a.StateProvinceID, a.PostalCode " +
"FROM Person.Address a " +
"INNER JOIN Sales.SalesOrderHeader h " +
"ON a.AddressID = h.ShipToAddressID OR a.AddressID = h.BillToAddressID " +
"WHERE DATEPART(YEAR, OrderDate) = @year; " +
"SELECT DISTINCT c.ContactID, c.Title, c.FirstName, " +
"c.LastName, c.EmailAddress, c.Phone " +
"FROM Person.Contact c " +
"INNER JOIN Sales.SalesOrderHeader h " +
"ON c.ContactID = h.ContactID " +
"WHERE DATEPART(YEAR, OrderDate) = @year;",
connectionString);
// Add table mappings.
da.SelectCommand.Parameters.AddWithValue("@year", 2002);
da.TableMappings.Add("Table", "SalesOrderHeader");
da.TableMappings.Add("Table1", "SalesOrderDetail");
da.TableMappings.Add("Table2", "Product");
da.TableMappings.Add("Table3", "Address");
da.TableMappings.Add("Table4", "Contact");
// Fill the DataSet.
da.Fill(ds);
// Add data relations.
DataTable orderHeader = ds.Tables["SalesOrderHeader"];
DataTable orderDetail = ds.Tables["SalesOrderDetail"];
DataRelation order = new DataRelation("SalesOrderHeaderDetail",
orderHeader.Columns["SalesOrderID"],
orderDetail.Columns["SalesOrderID"], true);
ds.Relations.Add(order);
DataTable contact = ds.Tables["Contact"];
DataTable orderHeader2 = ds.Tables["SalesOrderHeader"];
DataRelation orderContact = new DataRelation("SalesOrderContact",
contact.Columns["ContactID"],
orderHeader2.Columns["ContactID"], true);
ds.Relations.Add(orderContact);
}
catch (SqlException ex)
{
Console.WriteLine("SQL exception occurred: " + ex.Message);
}