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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';
 
 
 /**
  * Class for connecting to SQLite2 and SQLite3 databases and performing common operations.
  *
  * @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_Sqlite extends Zend_Db_Adapter_Pdo_Abstract
 {
 
     /**
      * PDO type
      *
      * @var string
      */
      protected $_pdoType = 'sqlite';
 
     /**
      * 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::BIGINT_TYPE,
         'REAL'               => Zend_Db::FLOAT_TYPE
     );
 
     /**
      * Constructor.
      *
      * $config is an array of key/value pairs containing configuration
      * options.  Note that the SQLite options are different than most of
      * the other PDO adapters in that no username or password are needed.
      * Also, an extra config key "sqlite2" specifies compatibility mode.
      *
      * dbname    => (string) The name of the database to user (required,
      *                       use :memory: for memory-based database)
      *
      * sqlite2   => (boolean) PDO_SQLITE defaults to SQLite 3.  For compatibility
      *                        with an older SQLite 2 database, set this to TRUE.
      *
      * @param array $config An array of configuration keys.
      */
     public function __construct(array $config = array())
     {
         if (isset($config['sqlite2']) && $config['sqlite2']) {
             $this->_pdoType = 'sqlite2';
         }
 
         // SQLite uses no username/password.  Stub to satisfy parent::_connect()
         $this->_config['username'] = null;
         $this->_config['password'] = null;
 
         return parent::__construct($config);
     }
 
     /**
      * 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");
         }
     }
 
     /**
      * DSN builder
      */
     protected function _dsn()
     {
         return $this->_pdoType .':'. $this->_config['dbname'];
     }
 
     /**
      * Special configuration for SQLite behavior: make sure that result sets
      * contain keys like 'column' instead of 'table.column'.
      *
      * @throws Zend_Db_Adapter_Exception
      */
     protected function _connect()
     {
         /**
          * if we already have a PDO object, no need to re-connect.
          */
         if ($this->_connection) {
             return;
         }
 
         parent::_connect();
 
         $retval = $this->_connection->exec('PRAGMA full_column_names=0');
         if ($retval === false) {
             $error = $this->_connection->errorInfo();
             /** @see Zend_Db_Adapter_Exception */
             // require_once 'Zend/Db/Adapter/Exception.php';
             throw new Zend_Db_Adapter_Exception($error[2]);
         }
 
         $retval = $this->_connection->exec('PRAGMA short_column_names=1');
         if ($retval === false) {
             $error = $this->_connection->errorInfo();
             /** @see Zend_Db_Adapter_Exception */
             // require_once 'Zend/Db/Adapter/Exception.php';
             throw new Zend_Db_Adapter_Exception($error[2]);
         }
     }
 
     /**
      * Returns a list of the tables in the database.
      *
      * @return array
      */
     public function listTables()
     {
         $sql = "SELECT name FROM sqlite_master WHERE type='table' "
              . "UNION ALL SELECT name FROM sqlite_temp_master "
              . "WHERE type='table' 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 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
      * IDENTITY         => integer; true if column is auto-generated with unique values
      *
      * @param string $tableName
      * @param string $schemaName OPTIONAL
      * @return array
      */
     public function describeTable($tableName, $schemaName = null)
     {
         $sql = 'PRAGMA ';
 
         if ($schemaName) {
             $sql .= $this->quoteIdentifier($schemaName) . '.';
         }
 
         $sql .= 'table_info('.$this->quoteIdentifier($tableName).')';
 
         $stmt = $this->query($sql);
 
         /**
          * Use FETCH_NUM so we are not dependent on the CASE attribute of the PDO connection
          */
         $result = $stmt->fetchAll(Zend_Db::FETCH_NUM);
 
         $cid        = 0;
         $name       = 1;
         $type       = 2;
         $notnull    = 3;
         $dflt_value = 4;
         $pk         = 5;
 
         $desc = array();
 
         $p = 1;
         foreach ($result as $key => $row) {
             list($length, $scale, $precision, $primary, $primaryPosition, $identity) =
                 array(null, null, null, false, null, false);
             if (preg_match('/^((?:var)?char)\((\d+)\)/i', $row[$type], $matches)) {
                 $row[$type] = $matches[1];
                 $length = $matches[2];
             } else if (preg_match('/^decimal\((\d+),(\d+)\)/i', $row[$type], $matches)) {
                 $row[$type] = 'DECIMAL';
                 $precision = $matches[1];
                 $scale = $matches[2];
             }
             if ((bool) $row[$pk]) {
                 $primary = true;
                 $primaryPosition = $p;
                 /**
                  * SQLite INTEGER primary key is always auto-increment.
                  */
                 $identity = (bool) ($row[$type] == 'INTEGER');
                 ++$p;
             }
             $desc[$this->foldCase($row[$name])] = array(
                 'SCHEMA_NAME'      => $this->foldCase($schemaName),
                 'TABLE_NAME'       => $this->foldCase($tableName),
                 'COLUMN_NAME'      => $this->foldCase($row[$name]),
                 'COLUMN_POSITION'  => $row[$cid]+1,
                 'DATA_TYPE'        => $row[$type],
                 'DEFAULT'          => $row[$dflt_value],
                 'NULLABLE'         => ! (bool) $row[$notnull],
                 'LENGTH'           => $length,
                 'SCALE'            => $scale,
                 'PRECISION'        => $precision,
                 'UNSIGNED'         => null, // Sqlite3 does not support unsigned data
                 'PRIMARY'          => $primary,
                 'PRIMARY_POSITION' => $primaryPosition,
                 'IDENTITY'         => $identity
             );
         }
         return $desc;
     }
 
     /**
      * 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)
     {
         $count = intval($count);
         if ($count <= 0) {
             /** @see Zend_Db_Adapter_Exception */
             // require_once 'Zend/Db/Adapter/Exception.php';
             throw new Zend_Db_Adapter_Exception("LIMIT argument count=$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");
         }
 
         $sql .= " LIMIT $count";
         if ($offset > 0) {
             $sql .= " OFFSET $offset";
         }
 
         return $sql;
     }
 
     /**
      * Quote a raw string.
      *
      * @param string $value     Raw string
      * @return string           Quoted string
      */
     protected function _quote($value)
     {
         if (!is_int($value) && !is_float($value)) {
             // Fix for null-byte injection
             $value = addcslashes($value, "\000\032");
         }
         return parent::_quote($value);
     }
 }