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 <?php
 /**
  * Zend Framework
  *
  * LICENSE
  *
  * This source file is subject to the new BSD license that is bundled
  * with this package in the file LICENSE.txt.
  * It is also available through the world-wide-web at this URL:
  * http://framework.zend.com/license/new-bsd
  * If you did not receive a copy of the license and are unable to
  * obtain it through the world-wide-web, please send an email
  * to license@zend.com so we can send you a copy immediately.
  *
  * @category   Zend
  * @package    Zend_Db
  * @subpackage Statement
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  * @version    $Id$
  */
 
 /**
  * @see Zend_Db_Statement
  */
 // require_once 'Zend/Db/Statement.php';
 
 /**
  * Extends for DB2 native adapter.
  *
  * @package    Zend_Db
  * @subpackage Statement
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 class Zend_Db_Statement_Db2 extends Zend_Db_Statement
 {
 
     /**
      * Column names.
      */
     protected $_keys;
 
     /**
      * Fetched result values.
      */
     protected $_values;
 
     /**
      * Prepare a statement handle.
      *
      * @param string $sql
      * @return void
      * @throws Zend_Db_Statement_Db2_Exception
      */
     public function _prepare($sql)
     {
         $connection = $this->_adapter->getConnection();
 
         // db2_prepare on i5 emits errors, these need to be
         // suppressed so that proper exceptions can be thrown
         $this->_stmt = @db2_prepare($connection, $sql);
 
         if (!$this->_stmt) {
             /**
              * @see Zend_Db_Statement_Db2_Exception
              */
             // require_once 'Zend/Db/Statement/Db2/Exception.php';
             throw new Zend_Db_Statement_Db2_Exception(
                 db2_stmt_errormsg(),
                 db2_stmt_error()
             );
         }
     }
 
     /**
      * Binds a parameter to the specified variable name.
      *
      * @param mixed $parameter Name the parameter, either integer or string.
      * @param mixed $variable  Reference to PHP variable containing the value.
      * @param mixed $type      OPTIONAL Datatype of SQL parameter.
      * @param mixed $length    OPTIONAL Length of SQL parameter.
      * @param mixed $options   OPTIONAL Other options.
      * @return bool
      * @throws Zend_Db_Statement_Db2_Exception
      */
     public function _bindParam($parameter, &$variable, $type = null, $length = null, $options = null)
     {
         if ($type === null) {
             $type = DB2_PARAM_IN;
         }
 
         if (isset($options['data-type'])) {
             $datatype = $options['data-type'];
         } else {
             $datatype = DB2_CHAR;
         }
 
         if (!db2_bind_param($this->_stmt, $parameter, "variable", $type, $datatype)) {
             /**
              * @see Zend_Db_Statement_Db2_Exception
              */
             // require_once 'Zend/Db/Statement/Db2/Exception.php';
             throw new Zend_Db_Statement_Db2_Exception(
                 db2_stmt_errormsg(),
                 db2_stmt_error()
             );
         }
 
         return true;
     }
 
     /**
      * Closes the cursor, allowing the statement to be executed again.
      *
      * @return bool
      */
     public function closeCursor()
     {
         if (!$this->_stmt) {
             return false;
         }
         db2_free_stmt($this->_stmt);
         $this->_stmt = false;
         return true;
     }
 
 
     /**
      * Returns the number of columns in the result set.
      * Returns null if the statement has no result set metadata.
      *
      * @return int The number of columns.
      */
     public function columnCount()
     {
         if (!$this->_stmt) {
             return false;
         }
         return db2_num_fields($this->_stmt);
     }
 
     /**
      * Retrieves the error code, if any, associated with the last operation on
      * the statement handle.
      *
      * @return string error code.
      */
     public function errorCode()
     {
         if (!$this->_stmt) {
             return false;
         }
 
         $error = db2_stmt_error();
         if ($error === '') {
             return false;
         }
 
         return $error;
     }
 
     /**
      * Retrieves an array of error information, if any, associated with the
      * last operation on the statement handle.
      *
      * @return array
      */
     public function errorInfo()
     {
         $error = $this->errorCode();
         if ($error === false){
             return false;
         }
 
         /*
          * Return three-valued array like PDO.  But DB2 does not distinguish
          * between SQLCODE and native RDBMS error code, so repeat the SQLCODE.
          */
         return array(
             $error,
             $error,
             db2_stmt_errormsg()
         );
     }
 
     /**
      * Executes a prepared statement.
      *
      * @param array $params OPTIONAL Values to bind to parameter placeholders.
      * @return bool
      * @throws Zend_Db_Statement_Db2_Exception
      */
     public function _execute(array $params = null)
     {
         if (!$this->_stmt) {
             return false;
         }
 
         $retval = true;
         if ($params !== null) {
             $retval = @db2_execute($this->_stmt, $params);
         } else {
             $retval = @db2_execute($this->_stmt);
         }
 
         if ($retval === false) {
             /**
              * @see Zend_Db_Statement_Db2_Exception
              */
             // require_once 'Zend/Db/Statement/Db2/Exception.php';
             throw new Zend_Db_Statement_Db2_Exception(
                 db2_stmt_errormsg(),
                 db2_stmt_error());
         }
 
         $this->_keys = array();
         if ($field_num = $this->columnCount()) {
             for ($i = 0; $i < $field_num; $i++) {
                 $name = db2_field_name($this->_stmt, $i);
                 $this->_keys[] = $name;
             }
         }
 
         $this->_values = array();
         if ($this->_keys) {
             $this->_values = array_fill(0, count($this->_keys), null);
         }
 
         return $retval;
     }
 
     /**
      * Fetches a row from the result set.
      *
      * @param int $style  OPTIONAL Fetch mode for this fetch operation.
      * @param int $cursor OPTIONAL Absolute, relative, or other.
      * @param int $offset OPTIONAL Number for absolute or relative cursors.
      * @return mixed Array, object, or scalar depending on fetch mode.
      * @throws Zend_Db_Statement_Db2_Exception
      */
     public function fetch($style = null, $cursor = null, $offset = null)
     {
         if (!$this->_stmt) {
             return false;
         }
 
         if ($style === null) {
             $style = $this->_fetchMode;
         }
 
         switch ($style) {
             case Zend_Db::FETCH_NUM :
                 $row = db2_fetch_array($this->_stmt);
                 break;
             case Zend_Db::FETCH_ASSOC :
                 $row = db2_fetch_assoc($this->_stmt);
                 break;
             case Zend_Db::FETCH_BOTH :
                 $row = db2_fetch_both($this->_stmt);
                 break;
             case Zend_Db::FETCH_OBJ :
                 $row = db2_fetch_object($this->_stmt);
                 break;
             case Zend_Db::FETCH_BOUND:
                 $row = db2_fetch_both($this->_stmt);
                 if ($row !== false) {
                     return $this->_fetchBound($row);
                 }
                 break;
             default:
                 /**
                  * @see Zend_Db_Statement_Db2_Exception
                  */
                 // require_once 'Zend/Db/Statement/Db2/Exception.php';
                 throw new Zend_Db_Statement_Db2_Exception("Invalid fetch mode '$style' specified");
                 break;
         }
 
         return $row;
     }
 
     /**
      * Fetches the next row and returns it as an object.
      *
      * @param string $class  OPTIONAL Name of the class to create.
      * @param array  $config OPTIONAL Constructor arguments for the class.
      * @return mixed One object instance of the specified class.
      */
     public function fetchObject($class = 'stdClass', array $config = array())
     {
         $obj = $this->fetch(Zend_Db::FETCH_OBJ);
         return $obj;
     }
 
     /**
      * Retrieves the next rowset (result set) for a SQL statement that has
      * multiple result sets.  An example is a stored procedure that returns
      * the results of multiple queries.
      *
      * @return bool
      * @throws Zend_Db_Statement_Db2_Exception
      */
     public function nextRowset()
     {
         /**
          * @see Zend_Db_Statement_Db2_Exception
          */
         // require_once 'Zend/Db/Statement/Db2/Exception.php';
         throw new Zend_Db_Statement_Db2_Exception(__FUNCTION__ . '() is not implemented');
     }
 
     /**
      * Returns the number of rows affected by the execution of the
      * last INSERT, DELETE, or UPDATE statement executed by this
      * statement object.
      *
      * @return int     The number of rows affected.
      */
     public function rowCount()
     {
         if (!$this->_stmt) {
             return false;
         }
 
         $num = @db2_num_rows($this->_stmt);
 
         if ($num === false) {
             return 0;
         }
 
         return $num;
     }
 
      /**
      * Returns an array containing all of the result set rows.
      *
      * @param int $style OPTIONAL Fetch mode.
      * @param int $col   OPTIONAL Column number, if fetch mode is by column.
      * @return array Collection of rows, each in a format by the fetch mode.
      *
      * Behaves like parent, but if limit()
      * is used, the final result removes the extra column
      * 'zend_db_rownum'
      */
     public function fetchAll($style = null, $col = null)
     {
         $data = parent::fetchAll($style, $col);
         $results = array();
         $remove = $this->_adapter->foldCase('ZEND_DB_ROWNUM');
 
         foreach ($data as $row) {
             if (is_array($row) && array_key_exists($remove, $row)) {
                 unset($row[$remove]);
             }
             $results[] = $row;
         }
         return $results;
     }
 }