SqlCeParameterCollection 类

收集与 SqlCeCommand 有关的所有参数以及它们各自到 DataSet 列的映射。

命名空间：  System.Data.SqlServerCe
程序集：  System.Data.SqlServerCe（在 System.Data.SqlServerCe.dll 中）

语法

声明
Public NotInheritable Class SqlCeParameterCollection _
    Inherits DbParameterCollection
用法
Dim instance As SqlCeParameterCollection

public sealed class SqlCeParameterCollection : DbParameterCollection

public ref class SqlCeParameterCollection sealed : public DbParameterCollection

[<SealedAttribute>]
type SqlCeParameterCollection =  
    class
        inherit DbParameterCollection
    end

public final class SqlCeParameterCollection extends DbParameterCollection

注释

集合中参数的数量必须与命令文本中参数占位符的数量相等。否则，SQL Server Compact 3.5 的 .NET Compact Framework 数据访问接口可能会引发错误。

示例

下面的示例通过 SqlCeDataAdapter 中的 SqlCeParameterCollection 集合创建 SqlCeParameter 的多个实例。这些参数用于选择数据源中的数据。然后它们将数据放置在 DataSet 中。此示例假定已经用适当的架构、命令和连接创建了 DataSet 和 SqlCeDataAdapter。

Dim cmd As SqlCeCommand = Nothing
Dim adp As SqlCeDataAdapter = Nothing

Try
    adp = New SqlCeDataAdapter()
    Dim conn As New SqlCeConnection("Data Source = MyDatabase.sdf")

    ' Create the SelectCommand
    '
    cmd = conn.CreateCommand()
    cmd.CommandText = "SELECT * FROM Orders WHERE [Ship Country] = @country AND [Ship City] = @city"
    cmd.Parameters.Add("@country", SqlDbType.NVarChar, 15)
    cmd.Parameters.Add("@city", SqlDbType.NVarChar, 15)

    cmd.Parameters("@country").Value = "UK"
    cmd.Parameters("@city").Value = "London"

    adp.SelectCommand = cmd

    ' Create the DeleteCommand
    '
    cmd = conn.CreateCommand()
    cmd.CommandText = "DELETE FROM Orders WHERE [Order ID] = @orderID"

    Dim p As SqlCeParameter = cmd.Parameters.Add("@orderID", SqlDbType.NChar, 5, "Order ID")
    p.SourceVersion = DataRowVersion.Original

    adp.DeleteCommand = cmd

    ' Populate the dataset with the results from the SELECT statement
    '
    Dim ds As New DataSet()
    adp.Fill(ds)

    ' Modify the dataset
    '
    MessageBox.Show("Number of rows: " & ds.Tables(0).Rows.Count)

    ' Delete some rows
    '
    ds.Tables(0).Rows(3).Delete()
    ds.Tables(0).Rows(4).Delete()

    ' This will execute two DELETE statements 
    '
    adp.Update(ds.Tables(0))
Catch e As Exception
    MessageBox.Show(e.Message)
Finally
    If Not Nothing Is adp.SelectCommand Then
        adp.SelectCommand.Dispose()
    End If
    If Not Nothing Is adp.DeleteCommand Then
        adp.DeleteCommand.Dispose()
    End If
End Try

SqlCeCommand cmd = null;
SqlCeDataAdapter adp = null;

try
{
    adp = new SqlCeDataAdapter();
    SqlCeConnection conn = new SqlCeConnection("Data Source = MyDatabase.sdf");

    // Create the SelectCommand
    //
    cmd = conn.CreateCommand();
    cmd.CommandText = "SELECT * FROM Orders WHERE [Ship Country] = @country AND [Ship City] = @city";
    cmd.Parameters.Add("@country", SqlDbType.NVarChar, 15);
    cmd.Parameters.Add("@city", SqlDbType.NVarChar, 15);

    cmd.Parameters["@country"].Value = "UK";
    cmd.Parameters["@city"].Value = "London";

    adp.SelectCommand = cmd;

    // Create the DeleteCommand
    //
    cmd = conn.CreateCommand();
    cmd.CommandText = "DELETE FROM Orders WHERE [Order ID] = @orderID";

    SqlCeParameter p = cmd.Parameters.Add("@orderID", SqlDbType.NChar, 5, "Order ID");
    p.SourceVersion = DataRowVersion.Original;

    adp.DeleteCommand = cmd;

    // Populate the dataset with the results from the SELECT statement
    //
    DataSet ds = new DataSet();
    adp.Fill(ds);

    // Modify the dataset
    //
    MessageBox.Show("Number of rows: " + ds.Tables[0].Rows.Count);

    // Delete some rows
    //
    ds.Tables[0].Rows[3].Delete();
    ds.Tables[0].Rows[4].Delete();

    // This will execute two DELETE statements 
    //
    adp.Update(ds.Tables[0]);
}
catch (Exception e)
{
    MessageBox.Show(e.Message);
}
finally
{
    if (null != adp.SelectCommand) adp.SelectCommand.Dispose();
    if (null != adp.DeleteCommand) adp.DeleteCommand.Dispose();
}

继承层次结构

System. . :: . .Object
  System. . :: . .MarshalByRefObject
    System.Data.Common. . :: . .DbParameterCollection
      System.Data.SqlServerCe..::..SqlCeParameterCollection

线程安全

Any public static (Shared in Microsoft Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

请参阅

参考

SqlCeParameterCollection 成员

System.Data.SqlServerCe 命名空间