DbDataAdapter.UpdateCommand 属性
定义
重要
一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。 对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。
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)]
public System.Data.Common.DbCommand UpdateCommand { get; set; }[<System.ComponentModel.Browsable(false)>]
member this.UpdateCommand : System.Data.Common.DbCommand with get, setPublic Property UpdateCommand As DbCommand属性值
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
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 。
