DbDataAdapter.UpdateCommand 属性

定义

命名空间:

System.Data.Common

程序集:

System.Data.Common.dll

Source:

DbDataAdapter.cs

获取或设置用于更新数据源中的记录的命令。

public:
 property System::Data::Common::DbCommand ^ UpdateCommand { System::Data::Common::DbCommand ^ get(); void set(System::Data::Common::DbCommand ^ value); };

[System.ComponentModel.Browsable(false)]
public System.Data.Common.DbCommand? UpdateCommand { get; set; }

[<System.ComponentModel.Browsable(false)>]
member this.UpdateCommand : System.Data.Common.DbCommand with get, set

Public Property UpdateCommand As DbCommand

属性值

DbCommand

在 IDbCommand 过程中使用的 Update(DataSet)，它针对数据集中已修改的行更新数据源中的记录。

属性

BrowsableAttribute

示例

以下示例创建派生类 OleDbDataAdapter 并设置其一些属性。

public static OleDbDataAdapter CreateCustomerAdapter(OleDbConnection conn)
{
  OleDbDataAdapter da = new OleDbDataAdapter();
  OleDbCommand cmd;
  OleDbParameter parm;

  // Create the SelectCommand.

  cmd = new OleDbCommand("SELECT * FROM Customers " +
                       "WHERE Country = @Country AND City = @City", conn);

  cmd.Parameters.Add("@Country", OleDbType.VarChar, 15);
  cmd.Parameters.Add("@City", OleDbType.VarChar, 15);

  da.SelectCommand = cmd;

  // Create the UpdateCommand.

  cmd = new OleDbCommand("UPDATE Customers SET CustomerID = @CustomerID, CompanyName = @CompanyName " +
                       "WHERE CustomerID = @oldCustomerID", conn);

  cmd.Parameters.Add("@CustomerID", OleDbType.Char, 5, "CustomerID");
  cmd.Parameters.Add("@CompanyName", OleDbType.VarChar, 40, "CompanyName");

  parm = cmd.Parameters.Add("@oldCustomerID", OleDbType.Char, 5, "CustomerID");
  parm.SourceVersion = DataRowVersion.Original;

  da.UpdateCommand = cmd;

  return da;
}

Public Shared Function CreateCustomerAdapter(conn As OleDbConnection) As OleDbDataAdapter 
  
  Dim da As New OleDbDataAdapter()
  Dim cmd As OleDbCommand
  Dim parm As OleDbParameter

  ' Create the SelectCommand.

  cmd = New OleDbCommand("SELECT * FROM Customers " & _
                       "WHERE Country = @Country AND City = @City", conn)

  cmd.Parameters.Add("@Country", OleDbType.VarChar, 15)
  cmd.Parameters.Add("@City", OleDbType.VarChar, 15)

  da.SelectCommand = cmd

  ' Create the UpdateCommand.

  cmd = New OleDbCommand("UPDATE Customers SET CustomerID = @CustomerID, CompanyName = @CompanyName " & _
                       "WHERE CustomerID = @oldCustomerID", conn)

  cmd.Parameters.Add("@CustomerID", OleDbType.Char, 5, "CustomerID")
  cmd.Parameters.Add("@CompanyName", OleDbType.VarChar, 40, "CompanyName")

  parm = cmd.Parameters.Add("@oldCustomerID", OleDbType.Char, 5, "CustomerID")
  parm.SourceVersion = DataRowVersion.Original

  da.UpdateCommand = cmd

  Return da
End Function

注解

在 期间 Update，如果未设置此属性，并且 中存在 DataSet主键信息， UpdateCommand 将自动生成 。

另请参阅

• 操作数据 (ADO.NET)
• DbProviderFactories (ADO.NET)
• ADO.NET 概述