SqlDataAdapter.DeleteCommand 属性

定义

命名空间:

System.Data.SqlClient

程序集:

System.Data.SqlClient.dll

包:

System.Data.SqlClient v4.9.0

Source:

System.Data.SqlClient.notsupported.cs

获取或设置一个 Transact-SQL 语句或存储过程，以从数据集删除记录。

public:
 property System::Data::SqlClient::SqlCommand ^ DeleteCommand { System::Data::SqlClient::SqlCommand ^ get(); void set(System::Data::SqlClient::SqlCommand ^ value); };

public System.Data.SqlClient.SqlCommand DeleteCommand { get; set; }

member this.DeleteCommand : System.Data.SqlClient.SqlCommand with get, set

Public Property DeleteCommand As SqlCommand

属性值

SqlCommand

在 SqlCommand 过程中使用 Update(DataSet)，以在数据库中删除对应于 DataSet 中已删除行的记录。

示例

以下示例创建 并 SqlDataAdapter 设置 SelectCommand、 InsertCommand、 UpdateCommand和 DeleteCommand 属性。 它假定你已经创建了 一个 SqlConnection 对象。

public static SqlDataAdapter CreateCustomerAdapter(
    SqlConnection connection)
{
    SqlDataAdapter adapter = new SqlDataAdapter();

    // Create the SelectCommand.
    SqlCommand command = new SqlCommand("SELECT * FROM Customers " +
        "WHERE Country = @Country AND City = @City", connection);

    // Add the parameters for the SelectCommand.
    command.Parameters.Add("@Country", SqlDbType.NVarChar, 15);
    command.Parameters.Add("@City", SqlDbType.NVarChar, 15);

    adapter.SelectCommand = command;

    // Create the InsertCommand.
    command = new SqlCommand(
        "INSERT INTO Customers (CustomerID, CompanyName) " +
        "VALUES (@CustomerID, @CompanyName)", connection);

    // Add the parameters for the InsertCommand.
    command.Parameters.Add("@CustomerID", SqlDbType.NChar, 5, "CustomerID");
    command.Parameters.Add("@CompanyName", SqlDbType.NVarChar, 40, "CompanyName");

    adapter.InsertCommand = command;

    // Create the UpdateCommand.
    command = new SqlCommand(
        "UPDATE Customers SET CustomerID = @CustomerID, CompanyName = @CompanyName " +
        "WHERE CustomerID = @oldCustomerID", connection);

    // Add the parameters for the UpdateCommand.
    command.Parameters.Add("@CustomerID", SqlDbType.NChar, 5, "CustomerID");
    command.Parameters.Add("@CompanyName", SqlDbType.NVarChar, 40, "CompanyName");
    SqlParameter parameter = command.Parameters.Add(
        "@oldCustomerID", SqlDbType.NChar, 5, "CustomerID");
    parameter.SourceVersion = DataRowVersion.Original;

    adapter.UpdateCommand = command;

    // Create the DeleteCommand.
    command = new SqlCommand(
        "DELETE FROM Customers WHERE CustomerID = @CustomerID", connection);

    // Add the parameters for the DeleteCommand.
    parameter = command.Parameters.Add(
        "@CustomerID", SqlDbType.NChar, 5, "CustomerID");
    parameter.SourceVersion = DataRowVersion.Original;

    adapter.DeleteCommand = command;

    return adapter;
}

Public Function CreateCustomerAdapter( _
  ByVal connection As SqlConnection) As SqlDataAdapter

    Dim adapter As SqlDataAdapter = New SqlDataAdapter()

    ' Create the SelectCommand.
    Dim command As SqlCommand = New SqlCommand( _
        "SELECT * FROM Customers " & _
        "WHERE Country = @Country AND City = @City", connection)

    ' Add the parameters for the SelectCommand.
    command.Parameters.Add("@Country", SqlDbType.NVarChar, 15)
    command.Parameters.Add("@City", SqlDbType.NVarChar, 15)

    adapter.SelectCommand = command

    ' Create the InsertCommand.
    command = New SqlCommand( _
        "INSERT INTO Customers (CustomerID, CompanyName) " & _
        "VALUES (@CustomerID, @CompanyName)", connection)

    ' Add the parameters for the InsertCommand.
    command.Parameters.Add("@CustomerID", SqlDbType.NChar, 5, "CustomerID")
    command.Parameters.Add("@CompanyName", SqlDbType.NVarChar, 40, "CompanyName")

    adapter.InsertCommand = command

    ' Create the UpdateCommand.
    command = New SqlCommand( _
        "UPDATE Customers SET CustomerID = @CustomerID, CompanyName = @CompanyName " & _
        "WHERE CustomerID = @oldCustomerID", connection)

    ' Add the parameters for the UpdateCommand.
    command.Parameters.Add("@CustomerID", SqlDbType.NChar, 5, "CustomerID")
    command.Parameters.Add("@CompanyName", SqlDbType.NVarChar, 40, "CompanyName")
    Dim parameter As SqlParameter = command.Parameters.Add( _
        "@oldCustomerID", SqlDbType.NChar, 5, "CustomerID")
    parameter.SourceVersion = DataRowVersion.Original

    adapter.UpdateCommand = command

    ' Create the DeleteCommand.
    command = New SqlCommand( _
        "DELETE FROM Customers WHERE CustomerID = @CustomerID", connection)

    ' Add the parameters for the DeleteCommand.
    command.Parameters.Add( _
        "@CustomerID", SqlDbType.NChar, 5, "CustomerID")
    parameter.SourceVersion = DataRowVersion.Original

    adapter.DeleteCommand = command

    Return adapter
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， DeleteCommand 则可以在设置 SelectCommand 属性并使用 SqlCommandBuilder时自动生成 。 然后，未设置的任何其他命令都由 SqlCommandBuilder生成。 此生成逻辑要求键列信息存在于 中 DataSet。 有关详细信息，请参阅使用 CommandBuilders 生成命令。

当 DeleteCommand 分配给以前创建的 SqlCommand时， SqlCommand 不会克隆 。 维护 DeleteCommand 对以前创建的 SqlCommand 对象的引用。

对于在 上 Update传播到数据源的每个列，都应将参数添加到 InsertCommand、 UpdateCommand或 DeleteCommand。 参数 SourceColumn 的 属性应设置为列的名称。 这表示参数的值不是手动设置的，而是取自当前处理的行中的特定列。

另请参阅

• 操作数据 (ADO.NET)
• 使用适用于 SQL Server 的 .NET Framework 数据提供程序
• ADO.NET 概述