Parameters Property

In This Topic

Gets or sets the UniParameterCollection.

Syntax

Visual Basic
C#

'Declaration
 
Public Shadows ReadOnly Property Parameters As UniParameterCollection

public new UniParameterCollection Parameters {get;}

Property Value

The parameters of a SQL statement or a stored procedure. The default value is an empty collection.

Remarks

By default, you have to construct this collection and provide values for it manually. However, if you choose to use autosynchronization mode by setting ParameterCheck property to true you can have the collecton adjusted automatically. Please refer to article Using Parameters in Universal .NET for detailed information on using this mode.

Example

The following example creates a UniConnection, UniCommand, fills its parameters and displays them. An UPDATE statement with the parameters involved is executed then.

csharp

static void CreateCommand(UniConnection myConnection, string mySelectQuery, UniParameter[] myParamArray)
{
  UniCommand myCommand = new UniCommand(mySelectQuery, myConnection);
  string myMessage = "";
  for (int i = 0; i < myParamArray.Length; i++)
  {
    myCommand.Parameters.Add(myParamArray[i]);
    myMessage += myCommand.Parameters[i].ToString() + "\n";
  }
  Console.Write(myMessage);
  try
  {
    myConnection.Open();
    myCommand.ExecuteNonQuery();
  }
  finally
  {
    myConnection.Close();
  }
}

static void Main(string[] args)
{
  UniParameter[] myParams = new UniParameter[] 
    {
      new UniParameter("DeptNo", 10),
      new UniParameter("DName", "COUNTING")
    };
  UniConnection myConnection1 = new UniConnection("Provider=SQL Server;Data Source=SERVER;Initial Catalog=Northwind;User ID=sa");
  CreateCommand(myConnection1,"UPDATE Test.Dept SET DName = :DName WHERE DeptNo = :DeptNo",myParams);
}

Visual Basic

Public Sub CreateCommand(ByVal myConnection As Devart.Data.Universal.UniConnection, _
 ByVal mySelectQuery As String, ByVal myParamArray() As Devart.Data.Universal.UniParameter)
  Dim myCommand As New Devart.Data.Universal.UniCommand(mySelectQuery, myConnection)
  Dim myMessage As String = ""
  Dim i As Integer
  For i = 0 To (myParamArray.Length - 1)
    myCommand.Parameters.Add(myParamArray(i))
    myMessage = String.Concat(myMessage, " ", myCommand.Parameters(i).ToString())
  Next
  Console.WriteLine(myMessage)
  Try
    myConnection.Open()
    myCommand.ExecuteNonQuery()
  Finally
    myConnection.Close()
  End Try
End Sub

Sub Main()
  Dim myP1 As New Devart.Data.Universal.UniParameter
  myP1.ParameterName = "DeptNo"
  myP1.Value = 10
  Dim myP2 As New Devart.Data.Universal.UniParameter
  myP2.ParameterName = "DName"
  myP2.Value = "ACCOUNTING"
  Dim myParams(1) As Devart.Data.Universal.UniParameter
  myParams(0) = myP1
  myParams(1) = myP2
  Dim myConnection1 As New Devart.Data.Universal.UniConnection("Provider=SQL Server;Data Source=SERVER;Initial Catalog=Northwind;User ID=sa")
  CreateCommand(myConnection1, "UPDATE Test.Dept SET DName = :DName WHERE DeptNo = :DeptNo", myParams)
End Sub

Reference

UniCommand Class
UniCommand Members
UniParameter Class

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