SqlCeCommandBuilder.GetUpdateCommand Method
Gets the automatically generated SqlCeCommand object required to perform updates on the database when an application calls Update on the SqlCeDataAdapter.
Namespace: System.Data.SqlServerCe
Assembly: System.Data.SqlServerCe (in System.Data.SqlServerCe.dll)
Syntax
'Declaration
Public Function GetUpdateCommand As SqlCeCommand
'Usage
Dim instance As SqlCeCommandBuilder
Dim returnValue As SqlCeCommand
returnValue = instance.GetUpdateCommand()
public SqlCeCommand GetUpdateCommand()
public:
SqlCeCommand^ GetUpdateCommand()
member GetUpdateCommand : unit -> SqlCeCommand
public function GetUpdateCommand() : SqlCeCommand
Return Value
Type: System.Data.SqlServerCe.SqlCeCommand
The automatically generated SqlCeCommand object required to perform updates.
Remarks
An application can use the GetUpdateCommand method for informational or troubleshooting purposes because it returns the SqlCeCommand object to be executed.
You can also use GetUpdateCommand as the basis of a modified command. For example, you might call GetUpdateCommand, modify one of its properties, and then explicitly set that on the SqlCeDataAdapter.
After the SQL statement is first generated, the application must explicitly call RefreshSchema() if the application changes the SQL statement in any way. Otherwise, the GetUpdateCommand still uses information from the previous statement, and that information might not be correct. The SQL statements are first generated when the application calls either Update or GetUpdateCommand.
Examples
The following example shows calling the GetUpdateCommand method of the SqlCeCommandBuilder.
Try
Dim conn As New SqlCeConnection("Data Source = MyDatabase.sdf")
conn.Open()
Dim cmd As SqlCeCommand = conn.CreateCommand()
cmd.CommandText = "SELECT * FROM employees"
Dim adp As New SqlCeDataAdapter(cmd)
Dim cb As New SqlCeCommandBuilder()
cb.DataAdapter = adp
MessageBox.Show(cb.GetUpdateCommand().CommandText)
MessageBox.Show(cb.GetInsertCommand().CommandText)
MessageBox.Show(cb.GetDeleteCommand().CommandText)
Dim ds As New DataSet("test")
adp.Fill(ds)
' Modify the contents of the DataSet
'
ds.Tables(0).Rows(0)("First Name") = "Joe"
adp.Update(ds)
Catch e1 As Exception
Console.WriteLine(e1.ToString())
End Try
try
{
SqlCeConnection conn = new SqlCeConnection("Data Source = MyDatabase.sdf");
conn.Open();
SqlCeCommand cmd = conn.CreateCommand();
cmd.CommandText = "SELECT * FROM employees";
SqlCeDataAdapter adp = new SqlCeDataAdapter(cmd);
SqlCeCommandBuilder cb = new SqlCeCommandBuilder();
cb.DataAdapter = adp;
MessageBox.Show(cb.GetUpdateCommand().CommandText);
MessageBox.Show(cb.GetInsertCommand().CommandText);
MessageBox.Show(cb.GetDeleteCommand().CommandText);
DataSet ds = new DataSet("test");
adp.Fill(ds);
// Modify the contents of the DataSet
//
ds.Tables[0].Rows[0]["First Name"] = "Joe";
adp.Update(ds);
}
catch (Exception e1)
{
Console.WriteLine(e1.ToString());
}