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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 Microsoft SQL Server Driver for PHP
  *
  * @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_Sqlsrv extends Zend_Db_Statement
 {
 
     /**
      * The connection_stmt object original string.
      */
     protected $_originalSQL;
 
     /**
      * Column names.
      */
     protected $_keys;
 
     /**
      * Query executed
      */
     protected $_executed = false;
 
     /**
      * Prepares statement handle
      *
      * @param string $sql
      * @return void
      * @throws Zend_Db_Statement_Sqlsrv_Exception
      */
     protected function _prepare($sql)
     {
         $connection = $this->_adapter->getConnection();
 
         $this->_stmt = sqlsrv_prepare($connection, $sql);
 
         if (!$this->_stmt) {
             // require_once 'Zend/Db/Statement/Sqlsrv/Exception.php';
             throw new Zend_Db_Statement_Sqlsrv_Exception(sqlsrv_errors());
         }
 
         $this->_originalSQL = $sql;
     }
 
     /**
      * 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 $options   OPTIONAL Other options.
      * @return bool
      * @throws Zend_Db_Statement_Exception
      */
     protected function _bindParam($parameter, &$variable, $type = null, $length = null, $options = null)
     {
         //Sql server doesn't support bind by name
         return true;
     }
 
     /**
      * Closes the cursor, allowing the statement to be executed again.
      *
      * @return bool
      */
     public function closeCursor()
     {
         if (!$this->_stmt) {
             return false;
         }
 
         sqlsrv_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 && $this->_executed) {
             return sqlsrv_num_fields($this->_stmt);
         }
 
         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;
         }
 
         $error = sqlsrv_errors();
         if (!$error) {
             return false;
         }
 
         return $error[0]['code'];
     }
 
 
     /**
      * 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;
         }
 
         $error = sqlsrv_errors();
         if (!$error) {
             return false;
         }
 
         return array(
             $error[0]['code'],
             $error[0]['message'],
         );
     }
 
 
     /**
      * Executes a prepared statement.
      *
      * @param array $params OPTIONAL Values to bind to parameter placeholders.
      * @return bool
      * @throws Zend_Db_Statement_Exception
      */
     public function _execute(array $params = null)
     {
         $connection = $this->_adapter->getConnection();
         if (!$this->_stmt) {
             return false;
         }
 
         if ($params !== null) {
             if (!is_array($params)) {
                 $params = array($params);
             }
             $error = false;
 
             // make all params passed by reference
             $params_ = array();
             $temp    = array();
             $i       = 1;
             foreach ($params as $param) {
                 $temp[$i]  = $param;
                 $params_[] = &$temp[$i];
                 $i++;
             }
             $params = $params_;
         }
 
         $this->_stmt = sqlsrv_query($connection, $this->_originalSQL, $params);
 
         if (!$this->_stmt) {
             // require_once 'Zend/Db/Statement/Sqlsrv/Exception.php';
             throw new Zend_Db_Statement_Sqlsrv_Exception(sqlsrv_errors());
         }
 
         $this->_executed = true;
 
         return (!$this->_stmt);
     }
 
     /**
      * 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 $offset OPTIONAL Number for absolute or relative cursors.
      * @return mixed Array, object, or scalar depending on fetch mode.
      * @throws Zend_Db_Statement_Exception
      */
     public function fetch($style = null, $cursor = null, $offset = null)
     {
         if (!$this->_stmt) {
             return false;
         }
 
         if (null === $style) {
             $style = $this->_fetchMode;
         }
 
         $values = sqlsrv_fetch_array($this->_stmt, SQLSRV_FETCH_ASSOC);
 
         if (!$values && (null !== $error = sqlsrv_errors())) {
             // require_once 'Zend/Db/Statement/Sqlsrv/Exception.php';
             throw new Zend_Db_Statement_Sqlsrv_Exception($error);
         }
 
         if (null === $values) {
             return null;
         }
 
         if (!$this->_keys) {
             foreach ($values as $key => $value) {
                 $this->_keys[] = $this->_adapter->foldCase($key);
             }
         }
 
         $values = array_values($values);
 
         $row = false;
         switch ($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);
                 $row   = $this->_fetchBound($row);
                 break;
             default:
                 // require_once 'Zend/Db/Statement/Sqlsrv/Exception.php';
                 throw new Zend_Db_Statement_Sqlsrv_Exception("Invalid fetch mode '$style' specified");
                 break;
         }
 
         return $row;
     }
 
     /**
      * Returns a single column from the next row of a result set.
      *
      * @param int $col OPTIONAL Position of the column to fetch.
      * @return string
      * @throws Zend_Db_Statement_Exception
      */
     public function fetchColumn($col = 0)
     {
         if (!$this->_stmt) {
             return false;
         }
 
         if (!sqlsrv_fetch($this->_stmt)) {
             if (null !== $error = sqlsrv_errors()) {
                 // require_once 'Zend/Db/Statement/Sqlsrv/Exception.php';
                 throw new Zend_Db_Statement_Sqlsrv_Exception($error);
             }
 
             // If no error, there is simply no record
             return false;
         }
 
         $data = sqlsrv_get_field($this->_stmt, $col); //0-based
         if ($data === false) {
             // require_once 'Zend/Db/Statement/Sqlsrv/Exception.php';
             throw new Zend_Db_Statement_Sqlsrv_Exception(sqlsrv_errors());
         }
 
         return $data;
     }
 
     /**
      * Fetches the next row and returns it as an object.
      *
      * @param string $class  OPTIONAL Name of the class to create.
      * @param array  $config OPTIONAL Constructor arguments for the class.
      * @return mixed One object instance of the specified class.
      * @throws Zend_Db_Statement_Exception
      */
     public function fetchObject($class = 'stdClass', array $config = array())
     {
         if (!$this->_stmt) {
             return false;
         }
 
         $obj = sqlsrv_fetch_object($this->_stmt);
 
         if ($error = sqlsrv_errors()) {
             // require_once 'Zend/Db/Statement/Sqlsrv/Exception.php';
             throw new Zend_Db_Statement_Sqlsrv_Exception($error);
         }
 
         /* @todo XXX handle parameters */
 
         if (null === $obj) {
             return false;
         }
 
         return $obj;
     }
 
     /**
      * Returns metadata for a column in a result set.
      *
      * @param int $column
      * @return mixed
      * @throws Zend_Db_Statement_Sqlsrv_Exception
      */
     public function getColumnMeta($column)
     {
         $fields = sqlsrv_field_metadata($this->_stmt);
 
         if (!$fields) {
             throw new Zend_Db_Statement_Sqlsrv_Exception('Column metadata can not be fetched');
         }
 
         if (!isset($fields[$column])) {
             throw new Zend_Db_Statement_Sqlsrv_Exception('Column index does not exist in statement');
         }
 
         return $fields[$column];
     }
 
     /**
      * 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_Exception
      */
     public function nextRowset()
     {
         if (sqlsrv_next_result($this->_stmt) === false) {
             // require_once 'Zend/Db/Statement/Sqlsrv/Exception.php';
             throw new Zend_Db_Statement_Sqlsrv_Exception(sqlsrv_errors());
         }
         
         // reset column keys
         $this->_keys = null;
 
         return true;
     }
 
     /**
      * 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.
      * @throws Zend_Db_Statement_Exception
      */
     public function rowCount()
     {
         if (!$this->_stmt) {
             return false;
         }
 
         if (!$this->_executed) {
             return 0;
         }
 
         $num_rows = sqlsrv_rows_affected($this->_stmt);
 
         // Strict check is necessary; 0 is a valid return value
         if ($num_rows === false) {
             // require_once 'Zend/Db/Statement/Sqlsrv/Exception.php';
             throw new Zend_Db_Statement_Sqlsrv_Exception(sqlsrv_errors());
         }
 
         return $num_rows;
     }
     
     /**
      * 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;
     }
 }