[Sommaire] [Imprimer]

   1  <?php
   2  /*
   3   *  $Id: Unique.php 105 2005-06-04 23:21:07Z david $
   4   *
   5   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   6   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   7   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   8   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   9   * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  10   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  11   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  12   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  13   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  14   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  15   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  16   *
  17   * This software consists of voluntary contributions made by many individuals
  18   * and is licensed under the LGPL. For more information please see
  19   * <http://propel.phpdb.org>.
  20   */
  21  
  22  include_once 'propel/engine/database/model/Index.php';
  23  
  24  /**
  25   * Information about unique columns of a table.  This class assumes
  26   * that in the underlying RDBMS, unique constraints and unique indices
  27   * are roughly equivalent.  For example, adding a unique constraint to
  28   * a column also creates an index on that column (this is known to be
  29   * true for MySQL and Oracle).
  30   *
  31   * @author Hans Lellelid <hans@xmpl.org> (Propel)
  32   * @author Jason van Zyl <jvanzyl@apache.org> (Torque)
  33   * @author Daniel Rall <dlr@collab.net> (Torque)
  34   * @version $Revision: 105 $
  35   * @package propel.engine.database.model
  36   */
  37  class Unique extends Index {
  38  
  39      /**
  40       * Default constructor.
  41       */
  42      public function __construct(Table $table, $indexColumns = array())
  43      {
  44      }
  45  
  46      /**
  47       * Returns <code>true</code>.
  48       */
  49      public function isUnique()
  50      {
  51          return true;
  52      }
  53  
  54      /**
  55       * String representation of the index. This is an xml representation.
  56       */
  57      public function toString()
  58      {
  59          $result = " <unique name=\"" . $this->getName() . "\">\n";        
  60          $columns = $this->getColumns();
  61          for ($i=0, $size=count($columns); $i < $size; $i++) {
  62              $result .= "  <unique-column name=\""
  63                  . $columns[$i]
  64                  . "\"/>\n";
  65          }
  66          $result .= " </unique>\n";
  67          return $result;
  68      }
  69  }