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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_Pdo_Abstract */
 // require_once 'Zend/Db/Adapter/Pdo/Abstract.php';
 
 /** @see Zend_Db_Abstract_Pdo_Ibm_Db2 */
 // require_once 'Zend/Db/Adapter/Pdo/Ibm/Db2.php';
 
 /** @see Zend_Db_Abstract_Pdo_Ibm_Ids */
 // require_once 'Zend/Db/Adapter/Pdo/Ibm/Ids.php';
 
 /** @see Zend_Db_Statement_Pdo_Ibm */
 // require_once 'Zend/Db/Statement/Pdo/Ibm.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_Pdo_Ibm extends Zend_Db_Adapter_Pdo_Abstract
 {
     /**
      * PDO type.
      *
      * @var string
      */
     protected $_pdoType = 'ibm';
 
     /**
      * The IBM data server connected to
      *
      * @var string
      */
     protected $_serverType = null;
 
     /**
      * 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,
                         'INTEGER'            => Zend_Db::INT_TYPE,
                         'SMALLINT'           => Zend_Db::INT_TYPE,
                         'BIGINT'             => Zend_Db::BIGINT_TYPE,
                         'DECIMAL'            => Zend_Db::FLOAT_TYPE,
                         'DEC'                => Zend_Db::FLOAT_TYPE,
                         'REAL'               => Zend_Db::FLOAT_TYPE,
                         'NUMERIC'            => Zend_Db::FLOAT_TYPE,
                         'DOUBLE PRECISION'   => Zend_Db::FLOAT_TYPE,
                         'FLOAT'              => Zend_Db::FLOAT_TYPE
                         );
 
     /**
      * Creates a PDO object and connects to the database.
      *
      * The IBM data server is set.
      * Current options are DB2 or IDS
      * @todo also differentiate between z/OS and i/5
      *
      * @return void
      * @throws Zend_Db_Adapter_Exception
      */
     public function _connect()
     {
         if ($this->_connection) {
             return;
         }
         parent::_connect();
 
         $this->getConnection()->setAttribute(Zend_Db::ATTR_STRINGIFY_FETCHES, true);
 
         try {
             if ($this->_serverType === null) {
                 $server = substr($this->getConnection()->getAttribute(PDO::ATTR_SERVER_INFO), 0, 3);
 
                 switch ($server) {
                     case 'DB2':
                         $this->_serverType = new Zend_Db_Adapter_Pdo_Ibm_Db2($this);
 
                         // Add DB2-specific numeric types
                         $this->_numericDataTypes['DECFLOAT'] = Zend_Db::FLOAT_TYPE;
                         $this->_numericDataTypes['DOUBLE']   = Zend_Db::FLOAT_TYPE;
                         $this->_numericDataTypes['NUM']      = Zend_Db::FLOAT_TYPE;
 
                         break;
                     case 'IDS':
                         $this->_serverType = new Zend_Db_Adapter_Pdo_Ibm_Ids($this);
 
                         // Add IDS-specific numeric types
                         $this->_numericDataTypes['SERIAL']       = Zend_Db::INT_TYPE;
                         $this->_numericDataTypes['SERIAL8']      = Zend_Db::BIGINT_TYPE;
                         $this->_numericDataTypes['INT8']         = Zend_Db::BIGINT_TYPE;
                         $this->_numericDataTypes['SMALLFLOAT']   = Zend_Db::FLOAT_TYPE;
                         $this->_numericDataTypes['MONEY']        = Zend_Db::FLOAT_TYPE;
 
                         break;
                     }
             }
         } catch (PDOException $e) {
             /** @see Zend_Db_Adapter_Exception */
             // require_once 'Zend/Db/Adapter/Exception.php';
             $error = strpos($e->getMessage(), 'driver does not support that attribute');
             if ($error) {
                 throw new Zend_Db_Adapter_Exception("PDO_IBM driver extension is downlevel.  Please use driver release version 1.2.1 or later", 0, $e);
             } else {
                 throw new Zend_Db_Adapter_Exception($e->getMessage(), $e->getCode(), $e);
             }
         }
     }
 
     /**
      * Creates a PDO DSN for the adapter from $this->_config settings.
      *
      * @return string
      */
     protected function _dsn()
     {
         $this->_checkRequiredOptions($this->_config);
 
         // check if using full connection string
         if (array_key_exists('host', $this->_config)) {
             $dsn = ';DATABASE=' . $this->_config['dbname']
             . ';HOSTNAME=' . $this->_config['host']
             . ';PORT='     . $this->_config['port']
             // PDO_IBM supports only DB2 TCPIP protocol
             . ';PROTOCOL=' . 'TCPIP;';
         } else {
             // catalogued connection
             $dsn = $this->_config['dbname'];
         }
         return $this->_pdoType . ': ' . $dsn;
     }
 
     /**
      * Checks required options
      *
      * @param  array $config
      * @throws Zend_Db_Adapter_Exception
      * @return void
      */
     protected function _checkRequiredOptions(array $config)
     {
         parent::_checkRequiredOptions($config);
 
         if (array_key_exists('host', $this->_config) &&
         !array_key_exists('port', $config)) {
             /** @see Zend_Db_Adapter_Exception */
             // require_once 'Zend/Db/Adapter/Exception.php';
             throw new Zend_Db_Adapter_Exception("Configuration must have a key for 'port' when 'host' is specified");
         }
     }
 
     /**
      * Prepares an SQL statement.
      *
      * @param string $sql The SQL statement with placeholders.
      * @param array $bind An array of data to bind to the placeholders.
      * @return PDOStatement
      */
     public function prepare($sql)
     {
         $this->_connect();
         $stmtClass = $this->_defaultStmtClass;
         $stmt = new $stmtClass($this, $sql);
         $stmt->setFetchMode($this->_fetchMode);
         return $stmt;
     }
 
     /**
      * Returns a list of the tables in the database.
      *
      * @return array
      */
     public function listTables()
     {
         $this->_connect();
         return $this->_serverType->listTables();
     }
 
     /**
      * 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 database or 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
      *
      * @todo Discover integer unsigned property.
      *
      * @param string $tableName
      * @param string $schemaName OPTIONAL
      * @return array
      */
     public function describeTable($tableName, $schemaName = null)
     {
         $this->_connect();
         return $this->_serverType->describeTable($tableName, $schemaName);
     }
 
     /**
      * Inserts a table row with specified data.
      * Special handling for PDO_IBM
      * remove empty slots
      *
      * @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)
     {
         $this->_connect();
         $newbind = array();
         if (is_array($bind)) {
             foreach ($bind as $name => $value) {
                 if($value !== null) {
                     $newbind[$name] = $value;
                 }
             }
         }
 
         return parent::insert($table, $newbind);
     }
 
     /**
      * Adds an adapter-specific LIMIT clause to the SELECT statement.
      *
      * @param string $sql
      * @param integer $count
      * @param integer $offset OPTIONAL
      * @return string
      */
     public function limit($sql, $count, $offset = 0)
     {
        $this->_connect();
        return $this->_serverType->limit($sql, $count, $offset);
     }
 
     /**
      * Gets the last ID generated automatically by an IDENTITY/AUTOINCREMENT
      * column.
      *
      * @param string $tableName OPTIONAL
      * @param string $primaryKey OPTIONAL
      * @return integer
      */
     public function lastInsertId($tableName = null, $primaryKey = null)
     {
         $this->_connect();
 
          if ($tableName !== null) {
             $sequenceName = $tableName;
             if ($primaryKey) {
                 $sequenceName .= "_$primaryKey";
             }
             $sequenceName .= '_seq';
             return $this->lastSequenceId($sequenceName);
         }
 
         $id = $this->getConnection()->lastInsertId();
 
         return $id;
     }
 
     /**
      * Return the most recent value from the specified sequence in the database.
      *
      * @param string $sequenceName
      * @return integer
      */
     public function lastSequenceId($sequenceName)
     {
         $this->_connect();
         return $this->_serverType->lastSequenceId($sequenceName);
     }
 
     /**
      * Generate a new value from the specified sequence in the database,
      * and return it.
      *
      * @param string $sequenceName
      * @return integer
      */
     public function nextSequenceId($sequenceName)
     {
         $this->_connect();
         return $this->_serverType->nextSequenceId($sequenceName);
     }
 
     /**
      * Retrieve server version in PHP style
      * Pdo_Idm doesn't support getAttribute(PDO::ATTR_SERVER_VERSION)
      * @return string
      */
     public function getServerVersion()
     {
         try {
             $stmt = $this->query('SELECT service_level, fixpack_num FROM TABLE (sysproc.env_get_inst_info()) as INSTANCEINFO');
             $result = $stmt->fetchAll(Zend_Db::FETCH_NUM);
             if (count($result)) {
                 $matches = null;
                 if (preg_match('/((?:[0-9]{1,2}\.){1,3}[0-9]{1,2})/', $result[0][0], $matches)) {
                     return $matches[1];
                 } else {
                     return null;
                 }
             }
             return null;
         } catch (PDOException $e) {
             return null;
         }
     }
 }