Parameters Property

In This Topic

Gets or sets the MySqlParameterCollection.

Syntax

Visual Basic
C#

'Declaration
 
Public Shadows ReadOnly Property Parameters As MySqlParameterCollection

public new MySqlParameterCollection 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 dotConnect for MySQL for detailed information on using this mode.

dotConnect for MySQL supports named and unnamed parameters.

Example

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

csharp

static void CreateCommand(MySqlConnection myConnection, string mySelectQuery, MySqlParameter[] myParamArray)
{
  MySqlCommand myCommand = new MySqlCommand(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)
{
  MySqlParameter[] myParams = new MySqlParameter[] 
    {
      new MySqlParameter("DeptNo", 10),
      new MySqlParameter("DName", "COUNTING")
    };
  MySqlConnection myConnection1 = new MySqlConnection(
      "User Id=root;Host=localhost;Database=Test;");
  CreateCommand(myConnection1,"UPDATE Test.Dept SET DName = :DName WHERE DeptNo = :DeptNo",myParams);
}

Visual Basic

Public Sub CreateCommand(ByVal myConnection As Devart.Data.MySql.MySqlConnection, _
 ByVal mySelectQuery As String, ByVal myParamArray() As Devart.Data.MySql.MySqlParameter)
  Dim myCommand As New Devart.Data.MySql.MySqlCommand(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.MySql.MySqlParameter
  myP1.ParameterName = "DeptNo"
  myP1.Value = 10
  Dim myP2 As New Devart.Data.MySql.MySqlParameter
  myP2.ParameterName = "DName"
  myP2.Value = "ACCOUNTING"
  Dim myParams(1) As Devart.Data.MySql.MySqlParameter
  myParams(0) = myP1
  myParams(1) = myP2
  Dim myConnection1 As New Devart.Data.MySql.MySqlConnection( _
      "User Id=root;Host=localhost;Database=Test;")
  CreateCommand(myConnection1, "UPDATE Test.Dept SET DName = :DName WHERE DeptNo = :DeptNo", myParams)
End Sub

Reference

MySqlCommand Class
MySqlCommand Members
MySqlParameter Class
CommandText Property

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