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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 Mysqli
  *
  * @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
  */
 class Zend_Db_Statement_Mysqli extends Zend_Db_Statement
 {
 
     /**
      * Column names.
      *
      * @var array
      */
     protected $_keys;
 
     /**
      * Fetched result values.
      *
      * @var array
      */
     protected $_values;
 
     /**
      * @var array
      */
     protected $_meta = null;
 
     /**
      * @param  string $sql
      * @return void
      * @throws Zend_Db_Statement_Mysqli_Exception
      */
     public function _prepare($sql)
     {
         $mysqli = $this->_adapter->getConnection();
 
         $this->_stmt = $mysqli->prepare($sql);
 
         if ($this->_stmt === false || $mysqli->errno) {
             /**
              * @see Zend_Db_Statement_Mysqli_Exception
              */
             // require_once 'Zend/Db/Statement/Mysqli/Exception.php';
             throw new Zend_Db_Statement_Mysqli_Exception("Mysqli prepare error: " . $mysqli->error, $mysqli->errno);
         }
     }
 
     /**
      * 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 $options   OPTIONAL Other options.
      * @return bool
      * @throws Zend_Db_Statement_Mysqli_Exception
      */
     protected function _bindParam($parameter, &$variable, $type = null, $length = null, $options = null)
     {
         return true;
     }
 
     /**
      * Closes the cursor and the statement.
      *
      * @return bool
      */
     public function close()
     {
         if ($this->_stmt) {
             $r = $this->_stmt->close();
             $this->_stmt = null;
             return $r;
         }
         return false;
     }
 
     /**
      * Closes the cursor, allowing the statement to be executed again.
      *
      * @return bool
      */
     public function closeCursor()
     {
         if ($stmt = $this->_stmt) {
             $mysqli = $this->_adapter->getConnection();
             while ($mysqli->more_results()) {
                 $mysqli->next_result();
             }
             $this->_stmt->free_result();
             return $this->_stmt->reset();
         }
         return false;
     }
 
     /**
      * 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 (isset($this->_meta) && $this->_meta) {
             return $this->_meta->field_count;
         }
         return 0;
     }
 
     /**
      * Retrieves the error code, if any, associated with the last operation on
      * the statement handle.
      *
      * @return string error code.
      */
     public function errorCode()
     {
         if (!$this->_stmt) {
             return false;
         }
         return substr($this->_stmt->sqlstate, 0, 5);
     }
 
     /**
      * Retrieves an array of error information, if any, associated with the
      * last operation on the statement handle.
      *
      * @return array
      */
     public function errorInfo()
     {
         if (!$this->_stmt) {
             return false;
         }
         return array(
             substr($this->_stmt->sqlstate, 0, 5),
             $this->_stmt->errno,
             $this->_stmt->error,
         );
     }
 
     /**
      * Executes a prepared statement.
      *
      * @param array $params OPTIONAL Values to bind to parameter placeholders.
      * @return bool
      * @throws Zend_Db_Statement_Mysqli_Exception
      */
     public function _execute(array $params = null)
     {
         if (!$this->_stmt) {
             return false;
         }
 
         // if no params were given as an argument to execute(),
         // then default to the _bindParam array
         if ($params === null) {
             $params = $this->_bindParam;
         }
         // send $params as input parameters to the statement
         if ($params) {
             array_unshift($params, str_repeat('s', count($params)));
             $stmtParams = array();
             foreach ($params as $k => &$value) {
                 $stmtParams[$k] = &$value;
             }
             call_user_func_array(
                 array($this->_stmt, 'bind_param'),
                 $stmtParams
                 );
         }
 
         // execute the statement
         $retval = $this->_stmt->execute();
         if ($retval === false) {
             /**
              * @see Zend_Db_Statement_Mysqli_Exception
              */
             // require_once 'Zend/Db/Statement/Mysqli/Exception.php';
             throw new Zend_Db_Statement_Mysqli_Exception("Mysqli statement execute error : " . $this->_stmt->error, $this->_stmt->errno);
         }
 
 
         // retain metadata
         if ($this->_meta === null) {
             $this->_meta = $this->_stmt->result_metadata();
             if ($this->_stmt->errno) {
                 /**
                  * @see Zend_Db_Statement_Mysqli_Exception
                  */
                 // require_once 'Zend/Db/Statement/Mysqli/Exception.php';
                 throw new Zend_Db_Statement_Mysqli_Exception("Mysqli statement metadata error: " . $this->_stmt->error, $this->_stmt->errno);
             }
         }
 
         // statements that have no result set do not return metadata
         if ($this->_meta !== false) {
 
             // get the column names that will result
             $this->_keys = array();
             foreach ($this->_meta->fetch_fields() as $col) {
                 $this->_keys[] = $this->_adapter->foldCase($col->name);
             }
 
             // set up a binding space for result variables
             $this->_values = array_fill(0, count($this->_keys), null);
 
             // set up references to the result binding space.
             // just passing $this->_values in the call_user_func_array()
             // below won't work, you need references.
             $refs = array();
             foreach ($this->_values as $i => &$f) {
                 $refs[$i] = &$f;
             }
 
             $this->_stmt->store_result();
             // bind to the result variables
             call_user_func_array(
                 array($this->_stmt, 'bind_result'),
                 $this->_values
             );
         }
         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 $offset OPTIONAL Number for absolute or relative cursors.
      * @return mixed Array, object, or scalar depending on fetch mode.
      * @throws Zend_Db_Statement_Mysqli_Exception
      */
     public function fetch($style = null, $cursor = null, $offset = null)
     {
         if (!$this->_stmt) {
             return false;
         }
         // fetch the next result
         $retval = $this->_stmt->fetch();
         switch ($retval) {
             case null: // end of data
             case false: // error occurred
                 $this->_stmt->reset();
                 return false;
             default:
                 // fallthrough
         }
 
         // make sure we have a fetch mode
         if ($style === null) {
             $style = $this->_fetchMode;
         }
 
         // dereference the result values, otherwise things like fetchAll()
         // return the same values for every entry (because of the reference).
         $values = array();
         foreach ($this->_values as $key => $val) {
             $values[] = $val;
         }
 
         $row = false;
         switch ($style) {
             case Zend_Db::FETCH_NUM:
                 $row = $values;
                 break;
             case Zend_Db::FETCH_ASSOC:
                 $row = array_combine($this->_keys, $values);
                 break;
             case Zend_Db::FETCH_BOTH:
                 $assoc = array_combine($this->_keys, $values);
                 $row = array_merge($values, $assoc);
                 break;
             case Zend_Db::FETCH_OBJ:
                 $row = (object) array_combine($this->_keys, $values);
                 break;
             case Zend_Db::FETCH_BOUND:
                 $assoc = array_combine($this->_keys, $values);
                 $row = array_merge($values, $assoc);
                 return $this->_fetchBound($row);
                 break;
             default:
                 /**
                  * @see Zend_Db_Statement_Mysqli_Exception
                  */
                 // require_once 'Zend/Db/Statement/Mysqli/Exception.php';
                 throw new Zend_Db_Statement_Mysqli_Exception("Invalid fetch mode '$style' specified");
                 break;
         }
         return $row;
     }
 
     /**
      * 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_Mysqli_Exception
      */
     public function nextRowset()
     {
         /**
          * @see Zend_Db_Statement_Mysqli_Exception
          */
         // require_once 'Zend/Db/Statement/Mysqli/Exception.php';
         throw new Zend_Db_Statement_Mysqli_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->_adapter) {
             return false;
         }
         $mysqli = $this->_adapter->getConnection();
         return $mysqli->affected_rows;
     }
 
 }