IDbDataAdapter.SelectCommand 屬性

定義

命名空間:

System.Data

組件:

System.Data.dll

取得或設定一個用於選擇資料來源記錄的 SQL 陳述式。

public:
 property System::Data::IDbCommand ^ SelectCommand { System::Data::IDbCommand ^ get(); void set(System::Data::IDbCommand ^ value); };

public System.Data.IDbCommand SelectCommand { get; set; }

member this.SelectCommand : System.Data.IDbCommand with get, set

Public Property SelectCommand As IDbCommand

屬性值

IDbCommand

在 IDbCommand 期間 Update(DataSet) ，會用來從資料來源中選取記錄，以便放入資料集中。

範例

以下範例建立繼承 OleDbDataAdapter 類別的實例，並設定 SelectCommand 和 InsertCommand 屬性。 它假設你已經建立了 OleDbConnection 一個物件。

public static OleDbDataAdapter CreateCustomerAdapter(
    OleDbConnection connection)
{
    OleDbDataAdapter adapter = new OleDbDataAdapter();
    OleDbCommand command;

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

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

    adapter.SelectCommand = command;

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

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

    adapter.InsertCommand = command;
    return adapter;
}

Public Shared Function CreateCustomerAdapter( _
    connection As OleDbConnection) As OleDbDataAdapter 

    Dim adapter As New OleDbDataAdapter()
    Dim command As OleDbCommand

    ' Create the SelectCommand.
    command = New OleDbCommand("SELECT * FROM Customers " & _
        "WHERE Country = ? AND City = ?", connection)

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

    adapter.SelectCommand = command

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

    command.Parameters.Add( _
        "CustomerID", OleDbType.Char, 5, "CustomerID")
    command.Parameters.Add( _
        "CompanyName", OleDbType.VarChar, 40, "CompanyName")

    adapter.InsertCommand = command
    Return adapter
End Function

備註

當 SelectCommand 被指派給先前建立 IDbCommand的 時，則 IDbCommand 不會被複製。 它 SelectCommand 會維持對先前建立 IDbCommand 物件的參考。

若 未 SelectCommand 回傳任何列，則不會新增資料表到 DataSet，且不會提出例外。