Inheritance: extends AbstractDoctrineQuery, implements eZ\Publish\Core\Persistence\Database\SelectQuery
 /**
  * Returns the SQL string for the subselect.
  *
  * Example:
  * <code>
  * <?php
  * $subSelect = $q->subSelect();
  * $subSelect->select( name )->from( 'table2' );
  * $q->select( '*' )
  *   ->from( 'table1' )
  *   ->where ( $q->expr->eq( 'name', $subSelect ) );
  * $stmt = $q->prepare();
  * $stmt->execute();
  * ?>
  * </code>
  *
  * @return string
  */
 public function getQuery()
 {
     return '( ' . parent::getQuery() . ' )';
 }
 /**
  * Binds the value $value to the specified variable name $placeHolder.
  *
  * This method uses ezcQuery::bindParam() from the ezcQuery class in which
  * the subSelect was called. Info about bound parameters are stored in
  * the parent ezcQuery object that is stored in the $outer property.
  *
  * The parameter $value specifies the value that you want to bind. If
  * $placeholder is not provided bindValue() will automatically create a
  * placeholder for you. An automatic placeholder will be of the name
  * 'placeholder1', 'placeholder2' etc.
  *
  * Example:
  * <code>
  * <?php
  * $value = 2;
  * $subSelect = $q->subSelect();
  * $subSelect->select( name )
  *          ->from( 'table2' )
  *          ->where(  $subSelect->expr->in(
  *                'id', $subSelect->bindValue( $value )
  *                 )
  *            );
  *
  * $q->select( '*' )
  *   ->from( 'table1' )
  *   ->where ( $q->expr->eq( 'name', $subSelect ) );
  *
  * $stmt = $q->prepare(); // the $value is bound to the query.
  * $value = 4;
  * $stmt->execute(); // subselect executed with 'id = 2'
  * ?>
  * </code>
  *
  * @see ezcQuery::bindValue()
  *
  * @param mixed $value
  * @param string $placeHolder the name to bind with. The string must start with a colon ':'.
  * @return string the placeholder name used.
  */
 public function bindValue($value, $placeHolder = null, $type = PDO::PARAM_STR)
 {
     return $this->outerQuery->bindValue($value, $placeHolder, $type);
 }