SqlCeResultSet.GetSqlMetaData 方法

傳回與指定資料行關聯的中繼資料資訊。

命名空間：  System.Data.SqlServerCe
組件：  System.Data.SqlServerCe (在 System.Data.SqlServerCe.dll 中)

語法

'宣告
Public Function GetSqlMetaData ( _
    ordinal As Integer _
) As SqlMetaData
'用途
Dim instance As SqlCeResultSet
Dim ordinal As Integer
Dim returnValue As SqlMetaData

returnValue = instance.GetSqlMetaData(ordinal)

public SqlMetaData GetSqlMetaData(
    int ordinal
)

public:
SqlMetaData^ GetSqlMetaData(
    int ordinal
)

member GetSqlMetaData : 
        ordinal:int -> SqlMetaData 

public function GetSqlMetaData(
    ordinal : int
) : SqlMetaData

參數

• ordinal
  型別：System.Int32
  要從中擷取資料之資料行的序數位置。

傳回值

型別：System.Data.SqlServerCe.SqlMetaData
指定索引處的資料行中繼資料。

備註

如果指定的序數位置沒有任何欄位，就會擲回例外狀況。

範例

Dim conn As SqlCeConnection = Nothing

Try
    File.Delete("Test.sdf")

    Dim engine As New SqlCeEngine("Data Source = Test.sdf")
    engine.CreateDatabase()

    conn = New SqlCeConnection("Data Source = Test.sdf")
    conn.Open()

    Dim cmd As SqlCeCommand = conn.CreateCommand()
    cmd.CommandText = "CREATE TABLE myTable (col1 INT, col2 MONEY, col3 NVARCHAR(200))"
    cmd.ExecuteNonQuery()

    cmd.CommandText = "SELECT * FROM myTable"

    Dim rs As SqlCeResultSet = cmd.ExecuteResultSet(ResultSetOptions.Updatable Or ResultSetOptions.Scrollable)

    Dim columnMetaData As SqlMetaData = rs.GetSqlMetaData(2) 'ordinal

    MessageBox.Show("Column Name = " & columnMetaData.Name)
    MessageBox.Show("Max Length = " & columnMetaData.MaxLength)
    MessageBox.Show("Type = " & columnMetaData.SqlDbType)

Catch e As Exception
    MessageBox.Show(e.Message)
Finally
    conn.Close()
End Try

SqlCeConnection conn = null;

try
{
    File.Delete("Test.sdf");

    SqlCeEngine engine = new SqlCeEngine("Data Source = Test.sdf");
    engine.CreateDatabase();

    conn = new SqlCeConnection("Data Source = Test.sdf");
    conn.Open();

    SqlCeCommand cmd = conn.CreateCommand();
    cmd.CommandText = "CREATE TABLE myTable (col1 INT, col2 MONEY, col3 NVARCHAR(200))";
    cmd.ExecuteNonQuery();

    cmd.CommandText = "SELECT * FROM myTable";

    SqlCeResultSet rs = cmd.ExecuteResultSet(ResultSetOptions.Updatable | 
        ResultSetOptions.Scrollable);

    SqlMetaData columnMetaData = rs.GetSqlMetaData(2 /*ordinal*/);

    MessageBox.Show("Column Name = " + columnMetaData.Name);
    MessageBox.Show("Max Length = " + columnMetaData.MaxLength);
    MessageBox.Show("Type = " + columnMetaData.SqlDbType);

}
catch (Exception e)
{
    MessageBox.Show(e.Message);
}
finally
{
    conn.Close();
}

請參閱

參考

SqlCeResultSet 類別

System.Data.SqlServerCe 命名空間