DB2Command Class

In This Topic

Represents a SQL statement or stored procedure to execute against DB2.

Syntax

Visual Basic
C#

'Declaration
 
Public Class DB2Command 
   Inherits Devart.Common.DbCommandBase
   Implements System.ComponentModel.IComponent, System.Data.IDbCommand, System.ICloneable, System.IDisposable

public class DB2Command : Devart.Common.DbCommandBase, System.ComponentModel.IComponent, System.Data.IDbCommand, System.ICloneable, System.IDisposable

Remarks

The DB2Command class provides the following methods for executing commands against the DB2 database:

Item	Description
ExecuteReader	Executes commands that return rows.
ExecutePageReader	Returns a specific subset of rows when paging through the results of a query.
ExecuteNonQuery	Executes SQL commands such as INSERT, DELETE, UPDATE.
ExecuteScalar	Retrieves a single value (for example, an aggregate value) from a data source.

If execution of the command results in a fatal DB2Exception, the DB2Connection may close. However, the user can reopen the connection and continue.

This class supports cross-form data binding with the InterForm Technology.

Example

The following example uses the ExecuteReader method of DB2Command, along with DB2DataReader and DB2Connection, to select rows from a table.

csharp

public void ReadMyData(string myConnString)
{
  string mySelectQuery = "SELECT DeptNo, DName FROM Dept";
  DB2Connection db2Connection = new DB2Connection(myConnString);
  DB2Command db2Command = new DB2Command(mySelectQuery,db2Connection);
  db2Connection.Open();
  DB2DataReader db2Reader = db2Command.ExecuteReader();
  try
  {
    while (db2Reader.Read())
    {
      Console.WriteLine(db2Reader.GetInt32(0).ToString() + ", " + db2Reader.GetString(1));
    }
  }
  finally
  {
  // always call Close when done reading.
  db2Reader.Close();
  // always call Close when done reading.
  db2Connection.Close();
  }
}

Visual Basic

Public Sub ReadMyData(myConnString As String)
  Dim mySelectQuery As String = "SELECT DeptNo, DName FROM Dept"
  Dim db2Connection As New DB2Connection(myConnString)
  Dim db2Command As New DB2Command(mySelectQuery, db2Connection)
  db2Connection.Open()
  Dim db2Reader As DB2DataReader = db2Command.ExecuteReader()
  Try
    While db2Reader.Read()
      Console.WriteLine(db2Reader.GetInt32(0).ToString() + ", " _
        + db2Reader.GetString(1))
    End While
  Finally
      ' always call Close when done reading.
      db2Reader.Close()
      ' always call Close when done with connection.
      db2Connection.Close()
  End Try
End Sub

Inheritance Hierarchy

System.Object
   System.MarshalByRefObject
      System.ComponentModel.Component
         System.Data.Common.DbCommand
            Devart.Common.DbCommandBase
               Devart.Data.DB2.DB2Command

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

Reference

DB2Command Members
Devart.Data.DB2 Namespace
DB2DataReader Class
DB2Connection Class

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