OracleCommand Class

In This Topic

Syntax
Remarks
Example
Inheritance Hierarchy
Requirements
See Also

Represents a SQL statement, PL/SQL statement, or stored procedure to execute against Oracle.

Syntax

Visual Basic
C#

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

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

Remarks

The OracleCommand class provides the following methods for executing commands against the Oracle database:

Item	Description
ExecuteReader	Executes commands that return rows.
Devart.Common.DbCommandBase.ExecutePageReader	Returns a specific subset of rows when paging through the results of a query.
ExecuteNonQuery	Executes SQL commands such as INSERT, DELETE, UPDATE or PL/SQL block.
ExecuteScalar	Retrieves a single value (for example, an aggregate value) from a data source.
ExecuteArray	Executes SQL statement specified number of times.

If execution of the command results in a fatal OracleException, the OracleConnection 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 OracleCommand, along with OracleDataReader and OracleConnection, to select rows from a table.

csharp

public void ReadMyData(string myConnString)
{
  string mySelectQuery = "SELECT DeptNo, DName FROM Test.Dept";
  OracleConnection myConnection = new OracleConnection(myConnString);
  OracleCommand myCommand = new OracleCommand(mySelectQuery,myConnection);
  myConnection.Open();
  OracleDataReader myReader = myCommand.ExecuteReader();
  try
  {
    while (myReader.Read())
    {
      Console.WriteLine(myReader.GetInt32(0).ToString() + ", " + myReader.GetString(1));
    }
  }
  finally
  {
  // always call Close when done reading.
  myReader.Close();
  // always call Close when done reading.
  myConnection.Close();
  }
}

Visual Basic

Public Sub ReadMyData(myConnString As String)
  Dim mySelectQuery As String = "SELECT DeptNo, DName FROM Test.Dept"
  Dim myConnection As New OracleConnection(myConnString)
  Dim myCommand As New OracleCommand(mySelectQuery, myConnection)
  myConnection.Open()
  Dim myReader As OracleDataReader = myCommand.ExecuteReader()
  Try
    While myReader.Read()
      Console.WriteLine(myReader.GetInt32(0).ToString() + ", " _
        + myReader.GetString(1))
    End While
  Finally
      ' always call Close when done reading.
      myReader.Close()
      ' always call Close when done with connection.
      myConnection.Close()
  End Try
End Sub

Inheritance Hierarchy

System.Object
   System.MarshalByRefObject
      System.ComponentModel.Component
         System.Data.Common.DbCommand
            Devart.Common.DbCommandBase
               Devart.Data.Oracle.OracleCommand

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

OracleCommand Members
Devart.Data.Oracle Namespace
OracleDataReader Class
OracleConnection Class

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