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freenetis-github/system/libraries/drivers/Database/Pdosqlite.php @ 8de2120d

8baed187 Michal Kliment
<?php defined('SYSPATH') OR die('No direct access allowed.');
/*
* Class: Database_PdoSqlite_Driver
* Provides specific database items for Sqlite.
*
* Connection string should be, eg: "pdosqlite://path/to/database.db"
*
* Version 1.0 alpha
* author - Doutu, updated by gregmac
* copyright - (c) BSD
* license - <no>
*/

class Database_Pdosqlite_Driver extends Database_Driver {

// Database connection link
protected $link;
protected $db_config;

/*
* Constructor: __construct
* Sets up the config for the class.
*
* Parameters:
* config - database configuration
*
*/
public function __construct($config)
{
$this->db_config = $config;

Log::add('debug', 'PDO:Sqlite Database Driver Initialized');
}

public function connect()
{
// Import the connect variables
extract($this->db_config['connection']);

try
{
$this->link = new PDO('sqlite:'.$socket.$database, $user, $pass,
array(PDO::ATTR_PERSISTENT => $this->db_config['persistent']));

$this->link->setAttribute(PDO::ATTR_CASE, PDO::CASE_NATURAL);
//$this->link->query('PRAGMA count_changes=1;');

if ($charset = $this->db_config['character_set'])
{
$this->set_charset($charset);
}
}
catch (PDOException $e)
{
throw new Kohana_Database_Exception('database.error', $e->getMessage());
}

// Clear password after successful connect
$this->db_config['connection']['pass'] = NULL;

return $this->link;
}

public function query($sql)
{
try
{
$sth = $this->link->prepare($sql);
}
catch (PDOException $e)
{
throw new Kohana_Database_Exception('database.error', $e->getMessage());
}
return new Pdosqlite_Result($sth, $this->link, $this->db_config['object'], $sql);
}

public function set_charset($charset)
{
$this->link->query('PRAGMA encoding = '.$this->escape_str($charset));
}

public function escape_table($table)
{
if ( ! $this->db_config['escape'])
return $table;

return '`'.str_replace('.', '`.`', $table).'`';
}

public function escape_column($column)
{
if ( ! $this->db_config['escape'])
return $column;

if ($column == '*')
return $column;

// This matches any functions we support to SELECT.
if ( preg_match('/(avg|count|sum|max|min)\(\s*(.*)\s*\)(\s*as\s*(.+)?)?/i', $column, $matches))
{
if ( count($matches) == 3)
{
return $matches[1].'('.$this->escape_column($matches[2]).')';
}
else if ( count($matches) == 5)
{
return $matches[1].'('.$this->escape_column($matches[2]).') AS '.$this->escape_column($matches[2]);
}
}

// This matches any modifiers we support to SELECT.
if ( ! preg_match('/\b(?:rand|all|distinct(?:row)?|high_priority|sql_(?:small_result|b(?:ig_result|uffer_result)|no_cache|ca(?:che|lc_found_rows)))\s/i', $column))
{
if (stripos($column, ' AS ') !== FALSE)
{
// Force 'AS' to uppercase
$column = str_ireplace(' AS ', ' AS ', $column);

// Runs escape_column on both sides of an AS statement
$column = array_map(array($this, __FUNCTION__), explode(' AS ', $column));

// Re-create the AS statement
return implode(' AS ', $column);
}

return preg_replace('/[^.*]+/', '`$0`', $column);
}

$parts = explode(' ', $column);
$column = '';

for ($i = 0, $c = count($parts); $i < $c; $i++)
{
// The column is always last
if ($i == ($c - 1))
{
$column .= preg_replace('/[^.*]+/', '`$0`', $parts[$i]);
}
else // otherwise, it's a modifier
{
$column .= $parts[$i].' ';
}
}
return $column;
}

public function limit($limit, $offset = 0)
{
return 'LIMIT '.$offset.', '.$limit;
}

public function compile_select($database)
{
$sql = ($database['distinct'] == TRUE) ? 'SELECT DISTINCT ' : 'SELECT ';
$sql .= (count($database['select']) > 0) ? implode(', ', $database['select']) : '*';

if (count($database['from']) > 0)
{
$sql .= "\nFROM ";
$sql .= implode(', ', $database['from']);
}

if (count($database['join']) > 0)
{
foreach($database['join'] AS $join)
{
$sql .= "\n".$join['type'].'JOIN '.implode(', ', $join['tables']).' ON '.$join['conditions'];
}
}

if (count($database['where']) > 0)
{
$sql .= "\nWHERE ";
}

$sql .= implode("\n", $database['where']);

if (count($database['groupby']) > 0)
{
$sql .= "\nGROUP BY ";
$sql .= implode(', ', $database['groupby']);
}

if (count($database['having']) > 0)
{
$sql .= "\nHAVING ";
$sql .= implode("\n", $database['having']);
}

if (count($database['orderby']) > 0)
{
$sql .= "\nORDER BY ";
$sql .= implode(', ', $database['orderby']);
}

if (is_numeric($database['limit']))
{
$sql .= "\n";
$sql .= $this->limit($database['limit'], $database['offset']);
}

return $sql;
}

public function escape_str($str)
{
if ( ! $this->db_config['escape'])
return $str;

if (function_exists('sqlite_escape_string'))
{
$res = sqlite_escape_string($str);
}
else
{
$res = str_replace("'", "''", $str);
}
return $res;
}

public function list_tables()
{
$sql = "SELECT `name` FROM `sqlite_master` WHERE `type`='table' ORDER BY `name`;";
try
{
$result = $this->query($sql)->result(FALSE, PDO::FETCH_ASSOC);
$tables = array();
foreach ($result as $row)
{
$tables[] = current($row);
}
}
catch (PDOException $e)
{
throw new Kohana_Database_Exception('database.error', $e->getMessage());
}
return $tables;
}

public function show_error()
{
$err = $this->link->errorInfo();
return isset($err[2]) ? $err[2] : 'Unknown error!';
}

public function list_fields($table, $query = FALSE)
{
static $tables;
if (is_object($query))
{
if (empty($tables[$table]))
{
$tables[$table] = array();

foreach ($query->result() as $row)
{
$tables[$table][] = $row->name;
}
}

return $tables[$table];
}
else
{
$result = $this->link->query( 'PRAGMA table_info('.$this->escape_table($table).')' );

foreach ($result as $row)
{
$tables[$table][$row['name']] = $this->sql_type($row['type']);
}

return $tables[$table];
}
}

public function field_data($table)
{
Log::add('error', 'This method is under developing');
}
/**
* Version number query string
*
* @access public
* @return string
*/
function version()
{
return $this->link->getAttribute(constant("PDO::ATTR_SERVER_VERSION"));
}

} // End Database_PdoSqlite_Driver Class

/*
* PDO-sqlite Result
*/
class Pdosqlite_Result extends Database_Result {

// Data fetching types
protected $fetch_type = PDO::FETCH_OBJ;
protected $return_type = PDO::FETCH_ASSOC;

/**
* Sets up the result variables.
*
* @param resource query result
* @param resource database link
* @param boolean return objects or arrays
* @param string SQL query that was run
*/
public function __construct($result, $link, $object = TRUE, $sql)
{
if (is_object($result) OR $result = $link->prepare($sql))
{
// run the query. Return true if success, false otherwise
if( ! $result->execute())
{
// Throw Kohana Exception with error message. See PDOStatement errorInfo() method
$arr_infos = $result->errorInfo();
throw new Kohana_Database_Exception('database.error', $arr_infos[2]);
}

if (preg_match('/^SELECT|PRAGMA|EXPLAIN/i', $sql))
{
$this->result = $result;
$this->current_row = 0;

$this->total_rows = $this->sqlite_row_count();

$this->fetch_type = ($object === TRUE) ? PDO::FETCH_OBJ : PDO::FETCH_ASSOC;
}
elseif (preg_match('/^DELETE|INSERT|UPDATE/i', $sql))
{
$this->insert_id = $link->lastInsertId();

$this->total_rows = $result->rowCount();
}
}
else
{
// SQL error
throw new Kohana_Database_Exception('database.error', $link->errorInfo().' - '.$sql);
}

// Set result type
$this->result($object);

// Store the SQL
$this->sql = $sql;
}

private function sqlite_row_count()
{
$count = 0;
while ($this->result->fetch())
{
$count++;
}

// The query must be re-fetched now.
$this->result->execute();

return $count;
}

/*
* Destructor: __destruct
* Magic __destruct function, frees the result.
*/
public function __destruct()
{
if (is_object($this->result))
{
$this->result->closeCursor();
$this->result = NULL;
}
}

public function result($object = TRUE, $type = PDO::FETCH_BOTH)
{
$this->fetch_type = (bool) $object ? PDO::FETCH_OBJ : PDO::FETCH_BOTH;

if ($this->fetch_type == PDO::FETCH_OBJ)
{
$this->return_type = (is_string($type) AND Kohana::auto_load($type)) ? $type : 'stdClass';
}
else
{
$this->return_type = $type;
}

return $this;
}

public function as_array($object = NULL, $type = PDO::FETCH_ASSOC)
{
return $this->result_array($object, $type);
}

public function result_array($object = NULL, $type = PDO::FETCH_ASSOC)
{
$rows = array();

if (is_string($object))
{
$fetch = $object;
}
elseif (is_bool($object))
{
if ($object === TRUE)
{
$fetch = PDO::FETCH_OBJ;

// NOTE - The class set by $type must be defined before fetching the result,
// autoloading is disabled to save a lot of stupid overhead.
$type = (is_string($type) AND Kohana::auto_load($type)) ? $type : 'stdClass';
}
else
{
$fetch = PDO::FETCH_OBJ;
}
}
else
{
// Use the default config values
$fetch = $this->fetch_type;

if ($fetch == PDO::FETCH_OBJ)
{
$type = (is_string($type) AND Kohana::auto_load($type)) ? $type : 'stdClass';
}
}
try
{
while ($row = $this->result->fetch($fetch))
{
$rows[] = $row;
}
}
catch(PDOException $e)
{
throw new Kohana_Database_Exception('database.error', $e->getMessage());
return FALSE;
}
return $rows;
}

public function list_fields()
{
$field_names = array();
for ($i = 0, $max = $this->result->columnCount(); $i < $max; $i++)
{
$info = $this->result->getColumnMeta($i);
$field_names[] = $info['name'];
}
return $field_names;
}

public function seek($offset)
{
// To request a scrollable cursor for your PDOStatement object, you must
// set the PDO::ATTR_CURSOR attribute to PDO::CURSOR_SCROLL when you
// prepare the statement.
Log::add('error', get_class($this).' does not support scrollable cursors, '.__FUNCTION__.' call ignored');

return FALSE;
}

public function offsetGet($offset)
{
try
{
return $this->result->fetch($this->fetch_type, PDO::FETCH_ORI_ABS, $offset);
}
catch(PDOException $e)
{
throw new Kohana_Database_Exception('database.error', $e->getMessage());
}
}

public function rewind()
{
// Same problem that seek() has, see above.
return $this->seek(0);
}

} // End PdoSqlite_Result Class