SqlCeCommand.Parameters-Eigenschaft

Ruft die SqlCeParameterCollection-Klasse ab.

Namespace:  System.Data.SqlServerCe
Assembly:  System.Data.SqlServerCe (in System.Data.SqlServerCe.dll)

Syntax

'Declaration
Public ReadOnly Property Parameters As SqlCeParameterCollection
    Get
'Usage
Dim instance As SqlCeCommand
Dim value As SqlCeParameterCollection

value = instance.Parameters

public SqlCeParameterCollection Parameters { get; }

public:
property SqlCeParameterCollection^ Parameters {
    SqlCeParameterCollection^ get ();
}

member Parameters : SqlCeParameterCollection

function get Parameters () : SqlCeParameterCollection

Eigenschaftswert

Typ: System.Data.SqlServerCe.SqlCeParameterCollection
Die Parameter der SQL-Anweisung. Der Standardwert ist eine leere Auflistung.

Hinweise

Wenn CommandType auf Text festgelegt ist, unterstützt der .NET Compact Framework-Datenanbieter für SQL Server Compact benannte Parameter, mit denen Parameter an eine SQL-Anweisung übergeben werden, die von einem SqlCeCommand aufgerufen wird. Beispiel:

SELECT * FROM Customers WHERE CustomerID = @customerID 

Beispiele

Im folgenden Beispiel wird eine SqlCeCommand-Klasse erstellt, und es wird ein Array von SqlCeParameter-Objekten festgelegt.

Dim conn As New SqlCeConnection("Data Source = MyDatabase.sdf;")
conn.Open()

Dim command As SqlCeCommand = conn.CreateCommand()

' Create and prepare a SQL statement
'
command.CommandText = "INSERT INTO Region (RegionID, RegionDescription) VALUES (@id, @desc)"

Dim param As SqlCeParameter = Nothing

' NOTE:
' For optimal performance, make sure you always set the parameter
' type and the maximum size - this is especially important for non-fixed
' types such as NVARCHAR or NTEXT; In case of named parameters, 
' SqlCeParameter instances do not need to be added to the collection
' in the order specified in the query; If however you use ? as parameter
' specifiers, then you do need to add the parameters in the correct order
'
param = New SqlCeParameter("@id", SqlDbType.Int)
command.Parameters.Add(param)

param = New SqlCeParameter("@desc", SqlDbType.NVarChar, 100)
command.Parameters.Add(param)

command.Parameters("@desc").Size = 100

' Calling Prepare after having set the CommandText and parameters
'
command.Prepare()

' Execute the SQL statement
'
command.ExecuteNonQuery()

' Change parameter values and call ExecuteNonQuery again
'
command.Parameters(0).Value = 21
command.Parameters(1).Value = "mySecondRegion"
command.ExecuteNonQuery()

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

SqlCeCommand command = conn.CreateCommand();

// Create and prepare a SQL statement
//
command.CommandText = "INSERT INTO Region (RegionID, RegionDescription) VALUES (@id, @desc)";

SqlCeParameter param = null;

// NOTE:
// For optimal performance, make sure you always set the parameter
// type and the maximum size - this is especially important for non-fixed
// types such as NVARCHAR or NTEXT; In case of named parameters, 
// SqlCeParameter instances do not need to be added to the collection
// in the order specified in the query; If however you use ? as parameter
// specifiers, then you do need to add the parameters in the correct order
//
param = new SqlCeParameter("@id", SqlDbType.Int);
command.Parameters.Add(param);

param = new SqlCeParameter("@desc", SqlDbType.NVarChar, 100);
command.Parameters.Add(param);

command.Parameters["@desc"].Size = 100;

// Calling Prepare after having set the CommandText and parameters
//
command.Prepare();

// Execute the SQL statement
//
command.ExecuteNonQuery();

// Change parameter values and call ExecuteNonQuery again
//
command.Parameters[0].Value = 21;
command.Parameters[1].Value = "mySecondRegion";
command.ExecuteNonQuery();

Siehe auch

Verweis

SqlCeCommand Klasse

System.Data.SqlServerCe-Namespace

SqlCeParameter