OdbcDataAdapter.UpdateCommand 属性

定义

命名空间:

System.Data.Odbc

程序集:

System.Data.Odbc.dll

包:

System.Data.Odbc v9.0.0-rc.2.24473.5

Source:

OdbcDataAdapter.cs

获取或设置 SQL 语句或用于在数据源中更新记录的存储过程。

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

public System.Data.Odbc.OdbcCommand? UpdateCommand { get; set; }

member this.UpdateCommand : System.Data.Odbc.OdbcCommand with get, set

Public Property UpdateCommand As OdbcCommand

属性值

OdbcCommand

OdbcCommand，用于在更新操作期间在对应于 DataSet 中被修改行的数据源中更新记录。

示例

以下示例创建 并 OdbcDataAdapter 设置 SelectCommand 和 UpdateCommand 属性。 它假定已创建 OdbcConnection 对象。

public static OdbcDataAdapter CreateDataAdapter(
    OdbcConnection connection)
{
    string selectCommand =
        "SELECT CustomerID, CompanyName FROM Customers";

    OdbcDataAdapter adapter = new OdbcDataAdapter(
        selectCommand, connection);
    adapter.MissingSchemaAction = MissingSchemaAction.AddWithKey;

    // Create the Insert, Update and Delete commands.
    adapter.InsertCommand = new OdbcCommand(
        "INSERT INTO Customers (CustomerID, CompanyName) " +
        "VALUES (?, ?)");

    adapter.UpdateCommand = new OdbcCommand(
        "UPDATE Customers SET CustomerID = ?, CompanyName = ? " +
        "WHERE CustomerID = ?");

    adapter.DeleteCommand = new OdbcCommand(
        "DELETE FROM Customers WHERE CustomerID = ?");

    // Create the parameters.
    adapter.InsertCommand.Parameters.Add("@CustomerID",
        OdbcType.Char, 5, "CustomerID");
    adapter.InsertCommand.Parameters.Add("@CompanyName",
        OdbcType.VarChar, 40, "CompanyName");

    adapter.UpdateCommand.Parameters.Add("@CustomerID",
        OdbcType.Char, 5, "CustomerID");
    adapter.UpdateCommand.Parameters.Add("@CompanyName",
        OdbcType.VarChar, 40, "CompanyName");
    adapter.UpdateCommand.Parameters.Add("@oldCustomerID",
        OdbcType.Char, 5, "CustomerID").SourceVersion =
        DataRowVersion.Original;

    adapter.DeleteCommand.Parameters.Add("@CustomerID",
        OdbcType.Char, 5, "CustomerID").SourceVersion =
        DataRowVersion.Original;

    return adapter;
}

Public Function CreateDataAdapter( _
    ByVal connection As OdbcConnection) As OdbcDataAdapter

    Dim selectCommand As String = _
        "SELECT CustomerID, CompanyName FROM Customers"
    Dim adapter As OdbcDataAdapter = _
        New OdbcDataAdapter(selectCommand, connection)

    adapter.MissingSchemaAction = MissingSchemaAction.AddWithKey

    ' Create the Insert, Update and Delete commands.
    adapter.InsertCommand = New OdbcCommand( _
        "INSERT INTO Customers (CustomerID, CompanyName) " & _
         "VALUES (?, ?)")

    adapter.UpdateCommand = New OdbcCommand( _
        "UPDATE Customers SET CustomerID = ?, CompanyName = ? " & _
        "WHERE CustomerID = ?")

    adapter.DeleteCommand = New OdbcCommand( _
        "DELETE FROM Customers WHERE CustomerID = ?")

    ' Create the parameters.
    adapter.InsertCommand.Parameters.Add( _
        "@CustomerID", OdbcType.Char, 5, "CustomerID")
    adapter.InsertCommand.Parameters.Add( _
        "@CompanyName", OdbcType.VarChar, 40, "CompanyName")

    adapter.UpdateCommand.Parameters.Add( _
        "@CustomerID", OdbcType.Char, 5, "CustomerID")
    adapter.UpdateCommand.Parameters.Add( _
        "@CompanyName", OdbcType.VarChar, 40, "CompanyName")
    adapter.UpdateCommand.Parameters.Add( _
        "@oldCustomerID", OdbcType.Char, 5, "CustomerID").SourceVersion = _
        DataRowVersion.Original

    adapter.DeleteCommand.Parameters.Add( _
        "@CustomerID", OdbcType.Char, 5, "CustomerID").SourceVersion = _
        DataRowVersion.Original

    Return adapter
End Function

注解

当 UpdateCommand 分配给以前创建的 OdbcCommand时， OdbcCommand 不会克隆 。 相反， UpdateCommand 维护对以前创建的 OdbcCommand 对象的引用。

在更新操作期间，如果未 UpdateCommand 设置 并且 中 DataSet存在主键信息，则可以使用 OdbcCommandBuilder 类自动生成 UpdateCommand，以及将 协调 DataSet 到数据源所需的其他命令。 为此，请设置 SelectCommand 的 OdbcDataAdapter属性。 生成逻辑还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。

注意

如果执行此命令返回行，则这些行可能与 合并， DataSet 具体取决于如何设置 UpdatedRowSource 对象的 属性 OdbcCommand 。