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Devart.Common Namespace / DbCommandBase Class
Members Example

In This Topic
    DbCommandBase Class
    In This Topic
    Represents a SQL statement or stored procedure to execute against a data source.
    Syntax
    'Declaration
     
    Public MustInherit Class DbCommandBase 
       Inherits System.Data.Common.DbCommand
       Implements System.ComponentModel.IComponentSystem.Data.IDbCommandSystem.IDisposable 
    Remarks
    Abstract DbCommandBase class implements some of DbCommandBase functionality that is data source-independent.
    Example
    The following sample demonstrates how using base classes helps to create data source-independent code.
    public void PrintDept(DbConnectionBase myConnection) {
            DbCommandBase myCommand = (DbCommandBase)myConnection.CreateCommand();
            myCommand.CommandText = "SELECT DeptNo, DName, Loc FROM Test.Dept";
            myConnection.Open();
            DbDataReader myReader = myCommand.ExecuteReader();
            try {
                    while (myReader.Read()) {
                            Console.WriteLine(myReader.GetInt32(0).ToString() + " " + 
                                    myReader.GetString(1) + " " + myReader.GetString(2));
                    }
            }
            finally {
                    myReader.Close();
                    myConnection.Close();
            }
    }
    Public Sub PrintDept(ByVal myConnection As DbConnectionBase)
            Dim myCommand As DbCommandBase = myConnection.CreateCommand()
            myCommand.CommandText = "SELECT DeptNo, DName, Loc FROM Test.Dept"
            myConnection.Open()
            Dim myReader As DbDataReader = myCommand.ExecuteReader()
            Try
                    While myReader.Read()
                            Console.WriteLine(String.Concat(myReader.GetInt32(0).ToString(), " ", _
                                    myReader.GetString(1), " ", myReader.GetString(2)))
                    End While
            Finally
                    myReader.Close()
                    myConnection.Close()
            End Try
    End Sub
    Inheritance Hierarchy

    System.Object
       System.MarshalByRefObject
          System.ComponentModel.Component
             System.Data.Common.DbCommand
                Devart.Common.DbCommandBase
                   Devart.Data.SqlShimCommand

    Requirements

    Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

    See Also