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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 Adapter
  * @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_Adapter_Abstract
  */
 // require_once 'Zend/Db/Adapter/Abstract.php';
 
 /**
  * @see Zend_Db_Statement_Sqlsrv
  */
 // require_once 'Zend/Db/Statement/Sqlsrv.php';
 
 /**
  * @category   Zend
  * @package    Zend_Db
  * @subpackage Adapter
  * @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_Adapter_Sqlsrv extends Zend_Db_Adapter_Abstract
 {
     /**
      * User-provided configuration.
      *
      * Basic keys are:
      *
      * username => (string) Connect to the database as this username.
      * password => (string) Password associated with the username.
      * dbname   => The name of the local SQL Server instance
      *
      * @var array
      */
     protected $_config = array(
         'dbname'       => null,
         'username'     => null,
         'password'     => null,
     );
 
     /**
      * Last insert id from INSERT query
      *
      * @var int
      */
     protected $_lastInsertId;
 
     /**
      * Query used to fetch last insert id
      *
      * @var string
      */
     protected $_lastInsertSQL = 'SELECT SCOPE_IDENTITY() as Current_Identity';
 
     /**
      * Keys are UPPERCASE SQL datatypes or the constants
      * Zend_Db::INT_TYPE, Zend_Db::BIGINT_TYPE, or Zend_Db::FLOAT_TYPE.
      *
      * Values are:
      * 0 = 32-bit integer
      * 1 = 64-bit integer
      * 2 = float or decimal
      *
      * @var array Associative array of datatypes to values 0, 1, or 2.
      */
     protected $_numericDataTypes = array(
         Zend_Db::INT_TYPE    => Zend_Db::INT_TYPE,
         Zend_Db::BIGINT_TYPE => Zend_Db::BIGINT_TYPE,
         Zend_Db::FLOAT_TYPE  => Zend_Db::FLOAT_TYPE,
         'INT'                => Zend_Db::INT_TYPE,
         'SMALLINT'           => Zend_Db::INT_TYPE,
         'TINYINT'            => Zend_Db::INT_TYPE,
         'BIGINT'             => Zend_Db::BIGINT_TYPE,
         'DECIMAL'            => Zend_Db::FLOAT_TYPE,
         'FLOAT'              => Zend_Db::FLOAT_TYPE,
         'MONEY'              => Zend_Db::FLOAT_TYPE,
         'NUMERIC'            => Zend_Db::FLOAT_TYPE,
         'REAL'               => Zend_Db::FLOAT_TYPE,
         'SMALLMONEY'         => Zend_Db::FLOAT_TYPE,
     );
 
     /**
      * Default class name for a DB statement.
      *
      * @var string
      */
     protected $_defaultStmtClass = 'Zend_Db_Statement_Sqlsrv';
 
     /**
      * Creates a connection resource.
      *
      * @return void
      * @throws Zend_Db_Adapter_Sqlsrv_Exception
      */
     protected function _connect()
     {
         if (is_resource($this->_connection)) {
             // connection already exists
             return;
         }
 
         if (!extension_loaded('sqlsrv')) {
             /**
              * @see Zend_Db_Adapter_Sqlsrv_Exception
              */
             // require_once 'Zend/Db/Adapter/Sqlsrv/Exception.php';
             throw new Zend_Db_Adapter_Sqlsrv_Exception('The Sqlsrv extension is required for this adapter but the extension is not loaded');
         }
 
         $serverName = $this->_config['host'];
         if (isset($this->_config['port'])) {
             $port        = (integer) $this->_config['port'];
             $serverName .= ', ' . $port;
         }
 
         $connectionInfo = array(
             'Database' => $this->_config['dbname'],
         );
 
         if (isset($this->_config['username']) && isset($this->_config['password']))
         {
             $connectionInfo += array(
                 'UID'      => $this->_config['username'],
                 'PWD'      => $this->_config['password'],
             );
         }
         // else - windows authentication
 
         if (!empty($this->_config['driver_options'])) {
             foreach ($this->_config['driver_options'] as $option => $value) {
                 // A value may be a constant.
                 if (is_string($value)) {
                     $constantName = strtoupper($value);
                     if (defined($constantName)) {
                         $connectionInfo[$option] = constant($constantName);
                     } else {
                         $connectionInfo[$option] = $value;
                     }
                 }
             }
         }
 
         $this->_connection = sqlsrv_connect($serverName, $connectionInfo);
 
         if (!$this->_connection) {
             /**
              * @see Zend_Db_Adapter_Sqlsrv_Exception
              */
             // require_once 'Zend/Db/Adapter/Sqlsrv/Exception.php';
             throw new Zend_Db_Adapter_Sqlsrv_Exception(sqlsrv_errors());
         }
     }
 
     /**
      * Check for config options that are mandatory.
      * Throw exceptions if any are missing.
      *
      * @param array $config
      * @throws Zend_Db_Adapter_Exception
      */
     protected function _checkRequiredOptions(array $config)
     {
         // we need at least a dbname
         if (! array_key_exists('dbname', $config)) {
             /** @see Zend_Db_Adapter_Exception */
             // require_once 'Zend/Db/Adapter/Exception.php';
             throw new Zend_Db_Adapter_Exception("Configuration array must have a key for 'dbname' that names the database instance");
         }
 
         if (! array_key_exists('password', $config) && array_key_exists('username', $config)) {
             /**
              * @see Zend_Db_Adapter_Exception
              */
             // require_once 'Zend/Db/Adapter/Exception.php';
             throw new Zend_Db_Adapter_Exception("Configuration array must have a key for 'password' for login credentials.
                                                 If Windows Authentication is desired, both keys 'username' and 'password' should be ommited from config.");
         }
 
         if (array_key_exists('password', $config) && !array_key_exists('username', $config)) {
             /**
              * @see Zend_Db_Adapter_Exception
              */
             // require_once 'Zend/Db/Adapter/Exception.php';
             throw new Zend_Db_Adapter_Exception("Configuration array must have a key for 'username' for login credentials.
                                                 If Windows Authentication is desired, both keys 'username' and 'password' should be ommited from config.");
         }
     }
 
     /**
      * Set the transaction isoltion level.
      *
      * @param integer|null $level A fetch mode from SQLSRV_TXN_*.
      * @return true
      * @throws Zend_Db_Adapter_Sqlsrv_Exception
      */
     public function setTransactionIsolationLevel($level = null)
     {
         $this->_connect();
         $sql = null;
 
         // Default transaction level in sql server
         if ($level === null)
         {
             $level = SQLSRV_TXN_READ_COMMITTED;
         }
 
         switch ($level) {
             case SQLSRV_TXN_READ_UNCOMMITTED:
                 $sql = "READ UNCOMMITTED";
                 break;
             case SQLSRV_TXN_READ_COMMITTED:
                 $sql = "READ COMMITTED";
                 break;
             case SQLSRV_TXN_REPEATABLE_READ:
                 $sql = "REPEATABLE READ";
                 break;
             case SQLSRV_TXN_SNAPSHOT:
                 $sql = "SNAPSHOT";
                 break;
             case SQLSRV_TXN_SERIALIZABLE:
                 $sql = "SERIALIZABLE";
                 break;
             default:
                 // require_once 'Zend/Db/Adapter/Sqlsrv/Exception.php';
                 throw new Zend_Db_Adapter_Sqlsrv_Exception("Invalid transaction isolation level mode '$level' specified");
         }
 
         if (!sqlsrv_query($this->_connection, "SET TRANSACTION ISOLATION LEVEL $sql;")) {
             // require_once 'Zend/Db/Adapter/Sqlsrv/Exception.php';
             throw new Zend_Db_Adapter_Sqlsrv_Exception("Transaction cannot be changed to '$level'");
         }
 
         return true;
     }
 
     /**
      * Test if a connection is active
      *
      * @return boolean
      */
     public function isConnected()
     {
         return (is_resource($this->_connection)
                 && (get_resource_type($this->_connection) == 'SQL Server Connection')
         );
     }
 
     /**
      * Force the connection to close.
      *
      * @return void
      */
     public function closeConnection()
     {
         if ($this->isConnected()) {
             sqlsrv_close($this->_connection);
         }
         $this->_connection = null;
     }
 
     /**
      * Returns an SQL statement for preparation.
      *
      * @param string $sql The SQL statement with placeholders.
      * @return Zend_Db_Statement_Sqlsrv
      */
     public function prepare($sql)
     {
         $this->_connect();
         $stmtClass = $this->_defaultStmtClass;
 
         if (!class_exists($stmtClass)) {
             /**
              * @see Zend_Loader
              */
             // require_once 'Zend/Loader.php';
             Zend_Loader::loadClass($stmtClass);
         }
 
         $stmt = new $stmtClass($this, $sql);
         $stmt->setFetchMode($this->_fetchMode);
         return $stmt;
     }
 
     /**
      * Quote a raw string.
      *
      * @param string $value     Raw string
      * @return string           Quoted string
      */
     protected function _quote($value)
     {
         if (is_int($value)) {
             return $value;
         } elseif (is_float($value)) {
             return sprintf('%F', $value);
         }
 
         $value = addcslashes($value, "\000\032");
         return "'" . str_replace("'", "''", $value) . "'";
     }
 
     /**
      * Gets the last ID generated automatically by an IDENTITY/AUTOINCREMENT column.
      *
      * As a convention, on RDBMS brands that support sequences
      * (e.g. Oracle, PostgreSQL, DB2), this method forms the name of a sequence
      * from the arguments and returns the last id generated by that sequence.
      * On RDBMS brands that support IDENTITY/AUTOINCREMENT columns, this method
      * returns the last value generated for such a column, and the table name
      * argument is disregarded.
      *
      * @param string $tableName   OPTIONAL Name of table.
      * @param string $primaryKey  OPTIONAL Name of primary key column.
      * @return string
      */
     public function lastInsertId($tableName = null, $primaryKey = null)
     {
         if ($tableName) {
             $tableName = $this->quote($tableName);
             $sql       = 'SELECT IDENT_CURRENT (' . $tableName . ') as Current_Identity';
             return (string) $this->fetchOne($sql);
         }
 
         if ($this->_lastInsertId > 0) {
             return (string) $this->_lastInsertId;
         }
 
         $sql = $this->_lastInsertSQL;
         return (string) $this->fetchOne($sql);
     }
 
     /**
      * Inserts a table row with specified data.
      *
      * @param mixed $table The table to insert data into.
      * @param array $bind Column-value pairs.
      * @return int The number of affected rows.
      */
     public function insert($table, array $bind)
     {
         // extract and quote col names from the array keys
         $cols = array();
         $vals = array();
         foreach ($bind as $col => $val) {
             $cols[] = $this->quoteIdentifier($col, true);
             if ($val instanceof Zend_Db_Expr) {
                 $vals[] = $val->__toString();
                 unset($bind[$col]);
             } else {
                 $vals[] = '?';
             }
         }
 
         // build the statement
         $sql = "INSERT INTO "
              . $this->quoteIdentifier($table, true)
              . ' (' . implode(', ', $cols) . ') '
              . 'VALUES (' . implode(', ', $vals) . ')'
              . ' ' . $this->_lastInsertSQL;
 
         // execute the statement and return the number of affected rows
         $stmt   = $this->query($sql, array_values($bind));
         $result = $stmt->rowCount();
 
         $stmt->nextRowset();
 
         $this->_lastInsertId = $stmt->fetchColumn();
 
         return $result;
     }
 
     /**
      * Returns a list of the tables in the database.
      *
      * @return array
      */
     public function listTables()
     {
         $this->_connect();
         $sql = "SELECT name FROM sysobjects WHERE type = 'U' ORDER BY name";
         return $this->fetchCol($sql);
     }
 
     /**
      * Returns the column descriptions for a table.
      *
      * The return value is an associative array keyed by the column name,
      * as returned by the RDBMS.
      *
      * The value of each array element is an associative array
      * with the following keys:
      *
      * SCHEMA_NAME      => string; name of schema
      * TABLE_NAME       => string;
      * COLUMN_NAME      => string; column name
      * COLUMN_POSITION  => number; ordinal position of column in table
      * DATA_TYPE        => string; SQL datatype name of column
      * DEFAULT          => string; default expression of column, null if none
      * NULLABLE         => boolean; true if column can have nulls
      * LENGTH           => number; length of CHAR/VARCHAR
      * SCALE            => number; scale of NUMERIC/DECIMAL
      * PRECISION        => number; precision of NUMERIC/DECIMAL
      * UNSIGNED         => boolean; unsigned property of an integer type
      * PRIMARY          => boolean; true if column is part of the primary key
      * PRIMARY_POSITION => integer; position of column in primary key
      * IDENTITY         => integer; true if column is auto-generated with unique values
      *
      * @todo Discover integer unsigned property.
      *
      * @param string $tableName
      * @param string $schemaName OPTIONAL
      * @return array
      */
     public function describeTable($tableName, $schemaName = null)
     {
         /**
          * Discover metadata information about this table.
          */
         $sql    = "exec sp_columns @table_name = " . $this->quoteIdentifier($tableName, true);
         $stmt   = $this->query($sql);
         $result = $stmt->fetchAll(Zend_Db::FETCH_NUM);
         
         // ZF-7698
         $stmt->closeCursor();
 
         if (count($result) == 0) {
             return array();
         }
 
         $owner           = 1;
         $table_name      = 2;
         $column_name     = 3;
         $type_name       = 5;
         $precision       = 6;
         $length          = 7;
         $scale           = 8;
         $nullable        = 10;
         $column_def      = 12;
         $column_position = 16;
 
         /**
          * Discover primary key column(s) for this table.
          */
         $tableOwner = $result[0][$owner];
         $sql        = "exec sp_pkeys @table_owner = " . $tableOwner
                     . ", @table_name = " . $this->quoteIdentifier($tableName, true);
         $stmt       = $this->query($sql);
 
         $primaryKeysResult = $stmt->fetchAll(Zend_Db::FETCH_NUM);
         $primaryKeyColumn  = array();
 
         // Per http://msdn.microsoft.com/en-us/library/ms189813.aspx,
         // results from sp_keys stored procedure are:
         // 0=TABLE_QUALIFIER 1=TABLE_OWNER 2=TABLE_NAME 3=COLUMN_NAME 4=KEY_SEQ 5=PK_NAME
 
         $pkey_column_name = 3;
         $pkey_key_seq     = 4;
         foreach ($primaryKeysResult as $pkeysRow) {
             $primaryKeyColumn[$pkeysRow[$pkey_column_name]] = $pkeysRow[$pkey_key_seq];
         }
 
         $desc = array();
         $p    = 1;
         foreach ($result as $key => $row) {
             $identity = false;
             $words    = explode(' ', $row[$type_name], 2);
             if (isset($words[0])) {
                 $type = $words[0];
                 if (isset($words[1])) {
                     $identity = (bool) preg_match('/identity/', $words[1]);
                 }
             }
 
             $isPrimary = array_key_exists($row[$column_name], $primaryKeyColumn);
             if ($isPrimary) {
                 $primaryPosition = $primaryKeyColumn[$row[$column_name]];
             } else {
                 $primaryPosition = null;
             }
 
             $desc[$this->foldCase($row[$column_name])] = array(
                 'SCHEMA_NAME'      => null, // @todo
                 'TABLE_NAME'       => $this->foldCase($row[$table_name]),
                 'COLUMN_NAME'      => $this->foldCase($row[$column_name]),
                 'COLUMN_POSITION'  => (int) $row[$column_position],
                 'DATA_TYPE'        => $type,
                 'DEFAULT'          => $row[$column_def],
                 'NULLABLE'         => (bool) $row[$nullable],
                 'LENGTH'           => $row[$length],
                 'SCALE'            => $row[$scale],
                 'PRECISION'        => $row[$precision],
                 'UNSIGNED'         => null, // @todo
                 'PRIMARY'          => $isPrimary,
                 'PRIMARY_POSITION' => $primaryPosition,
                 'IDENTITY'         => $identity,
             );
         }
 
         return $desc;
     }
 
     /**
      * Leave autocommit mode and begin a transaction.
      *
      * @return void
      * @throws Zend_Db_Adapter_Sqlsrv_Exception
      */
     protected function _beginTransaction()
     {
         if (!sqlsrv_begin_transaction($this->_connection)) {
             // require_once 'Zend/Db/Adapter/Sqlsrv/Exception.php';
             throw new Zend_Db_Adapter_Sqlsrv_Exception(sqlsrv_errors());
         }
     }
 
     /**
      * Commit a transaction and return to autocommit mode.
      *
      * @return void
      * @throws Zend_Db_Adapter_Sqlsrv_Exception
      */
     protected function _commit()
     {
         if (!sqlsrv_commit($this->_connection)) {
             // require_once 'Zend/Db/Adapter/Sqlsrv/Exception.php';
             throw new Zend_Db_Adapter_Sqlsrv_Exception(sqlsrv_errors());
         }
     }
 
     /**
      * Roll back a transaction and return to autocommit mode.
      *
      * @return void
      * @throws Zend_Db_Adapter_Sqlsrv_Exception
      */
     protected function _rollBack()
     {
         if (!sqlsrv_rollback($this->_connection)) {
             // require_once 'Zend/Db/Adapter/Sqlsrv/Exception.php';
             throw new Zend_Db_Adapter_Sqlsrv_Exception(sqlsrv_errors());
         }
     }
 
     /**
      * Set the fetch mode.
      *
      * @todo Support FETCH_CLASS and FETCH_INTO.
      *
      * @param integer $mode A fetch mode.
      * @return void
      * @throws Zend_Db_Adapter_Sqlsrv_Exception
      */
     public function setFetchMode($mode)
     {
         switch ($mode) {
             case Zend_Db::FETCH_NUM:   // seq array
             case Zend_Db::FETCH_ASSOC: // assoc array
             case Zend_Db::FETCH_BOTH:  // seq+assoc array
             case Zend_Db::FETCH_OBJ:   // object
                 $this->_fetchMode = $mode;
                 break;
             case Zend_Db::FETCH_BOUND: // bound to PHP variable
                 // require_once 'Zend/Db/Adapter/Sqlsrv/Exception.php';
                 throw new Zend_Db_Adapter_Sqlsrv_Exception('FETCH_BOUND is not supported yet');
                 break;
             default:
                 // require_once 'Zend/Db/Adapter/Sqlsrv/Exception.php';
                 throw new Zend_Db_Adapter_Sqlsrv_Exception("Invalid fetch mode '$mode' specified");
                 break;
         }
     }
 
     /**
      * Adds an adapter-specific LIMIT clause to the SELECT statement.
      *
      * @param string $sql
      * @param integer $count
      * @param integer $offset OPTIONAL
      * @return string
      * @throws Zend_Db_Adapter_Sqlsrv_Exception
      */
      public function limit($sql, $count, $offset = 0)
      {
         $count = intval($count);
         if ($count <= 0) {
             // require_once 'Zend/Db/Adapter/Exception.php';
             throw new Zend_Db_Adapter_Exception("LIMIT argument count=$count is not valid");
         }
 
         $offset = intval($offset);
         if ($offset < 0) {
             /** @see Zend_Db_Adapter_Exception */
             // require_once 'Zend/Db/Adapter/Exception.php';
             throw new Zend_Db_Adapter_Exception("LIMIT argument offset=$offset is not valid");
         }
 
         if ($offset == 0) {
             $sql = preg_replace('/^SELECT\s/i', 'SELECT TOP ' . $count . ' ', $sql);
         } else {
             $orderby = stristr($sql, 'ORDER BY');
 
             if (!$orderby) {
                 $over = 'ORDER BY (SELECT 0)';
             } else {
                 $over = preg_replace('/\"[^,]*\".\"([^,]*)\"/i', '"inner_tbl"."$1"', $orderby);
             }
 
             // Remove ORDER BY clause from $sql
             $sql = preg_replace('/\s+ORDER BY(.*)/', '', $sql);
 
             // Add ORDER BY clause as an argument for ROW_NUMBER()
             $sql = "SELECT ROW_NUMBER() OVER ($over) AS \"ZEND_DB_ROWNUM\", * FROM ($sql) AS inner_tbl";
 
             $start = $offset + 1;
 
             if ($count == PHP_INT_MAX) {
                 $sql = "WITH outer_tbl AS ($sql) SELECT * FROM outer_tbl WHERE \"ZEND_DB_ROWNUM\" >= $start";
             }
             else {
                 $end = $offset + $count;
                 $sql = "WITH outer_tbl AS ($sql) SELECT * FROM outer_tbl WHERE \"ZEND_DB_ROWNUM\" BETWEEN $start AND $end";
             }
         }
 
         return $sql;
     }
 
     /**
      * Check if the adapter supports real SQL parameters.
      *
      * @param string $type 'positional' or 'named'
      * @return bool
      */
     public function supportsParameters($type)
     {
         if ($type == 'positional') {
             return true;
         }
 
         // if its 'named' or anything else
         return false;
     }
 
     /**
      * Retrieve server version in PHP style
      *
      * @return string
      */
     public function getServerVersion()
     {
         $this->_connect();
         $serverInfo = sqlsrv_server_info($this->_connection);
 
         if ($serverInfo !== false) {
             return $serverInfo['SQLServerVersion'];
         }
 
         return null;
     }
 }