Current File : /www/old2/_music/diplomka/diplomka/src/API/libs/dibi/drivers/sqlite.php
<?php
/**
* This file is part of the "dibi" - smart database abstraction layer.
*
* Copyright (c) 2005 David Grudl (http://davidgrudl.com)
*
* For the full copyright and license information, please view
* the file license.txt that was distributed with this source code.
*/
require_once dirname(__FILE__) . '/sqlite.reflector.php';
/**
* The dibi driver for SQLite database.
*
* Driver options:
* - database (or file) => the filename of the SQLite database
* - persistent (bool) => try to find a persistent link?
* - unbuffered (bool) => sends query without fetching and buffering the result rows automatically?
* - formatDate => how to format date in SQL (@see date)
* - formatDateTime => how to format datetime in SQL (@see date)
* - dbcharset => database character encoding (will be converted to 'charset')
* - charset => character encoding to set (default is UTF-8)
* - resource (resource) => existing connection resource
* - lazy, profiler, result, substitutes, ... => see DibiConnection options
*
* @author David Grudl
* @package dibi\drivers
*/
class DibiSqliteDriver extends DibiObject implements IDibiDriver, IDibiResultDriver
{
/** @var resource Connection resource */
private $connection;
/** @var resource Resultset resource */
private $resultSet;
/** @var bool Is buffered (seekable and countable)? */
private $buffered;
/** @var string Date and datetime format */
private $fmtDate, $fmtDateTime;
/** @var string character encoding */
private $dbcharset, $charset;
/**
* @throws DibiNotSupportedException
*/
public function __construct()
{
if (!extension_loaded('sqlite')) {
throw new DibiNotSupportedException("PHP extension 'sqlite' is not loaded.");
}
}
/**
* Connects to a database.
* @return void
* @throws DibiException
*/
public function connect(array &$config)
{
DibiConnection::alias($config, 'database', 'file');
$this->fmtDate = isset($config['formatDate']) ? $config['formatDate'] : 'U';
$this->fmtDateTime = isset($config['formatDateTime']) ? $config['formatDateTime'] : 'U';
$errorMsg = '';
if (isset($config['resource'])) {
$this->connection = $config['resource'];
} elseif (empty($config['persistent'])) {
$this->connection = @sqlite_open($config['database'], 0666, $errorMsg); // intentionally @
} else {
$this->connection = @sqlite_popen($config['database'], 0666, $errorMsg); // intentionally @
}
if (!$this->connection) {
throw new DibiDriverException($errorMsg);
}
$this->buffered = empty($config['unbuffered']);
$this->dbcharset = empty($config['dbcharset']) ? 'UTF-8' : $config['dbcharset'];
$this->charset = empty($config['charset']) ? 'UTF-8' : $config['charset'];
if (strcasecmp($this->dbcharset, $this->charset) === 0) {
$this->dbcharset = $this->charset = NULL;
}
}
/**
* Disconnects from a database.
* @return void
*/
public function disconnect()
{
sqlite_close($this->connection);
}
/**
* Executes the SQL query.
* @param string SQL statement.
* @return IDibiResultDriver|NULL
* @throws DibiDriverException
*/
public function query($sql)
{
if ($this->dbcharset !== NULL) {
$sql = iconv($this->charset, $this->dbcharset . '//IGNORE', $sql);
}
DibiDriverException::tryError();
if ($this->buffered) {
$res = sqlite_query($this->connection, $sql);
} else {
$res = sqlite_unbuffered_query($this->connection, $sql);
}
if (DibiDriverException::catchError($msg)) {
throw new DibiDriverException($msg, sqlite_last_error($this->connection), $sql);
} elseif (is_resource($res)) {
return $this->createResultDriver($res);
}
}
/**
* Gets the number of affected rows by the last INSERT, UPDATE or DELETE query.
* @return int|FALSE number of rows or FALSE on error
*/
public function getAffectedRows()
{
return sqlite_changes($this->connection);
}
/**
* Retrieves the ID generated for an AUTO_INCREMENT column by the previous INSERT query.
* @return int|FALSE int on success or FALSE on failure
*/
public function getInsertId($sequence)
{
return sqlite_last_insert_rowid($this->connection);
}
/**
* Begins a transaction (if supported).
* @param string optional savepoint name
* @return void
* @throws DibiDriverException
*/
public function begin($savepoint = NULL)
{
$this->query('BEGIN');
}
/**
* Commits statements in a transaction.
* @param string optional savepoint name
* @return void
* @throws DibiDriverException
*/
public function commit($savepoint = NULL)
{
$this->query('COMMIT');
}
/**
* Rollback changes in a transaction.
* @param string optional savepoint name
* @return void
* @throws DibiDriverException
*/
public function rollback($savepoint = NULL)
{
$this->query('ROLLBACK');
}
/**
* Returns the connection resource.
* @return mixed
*/
public function getResource()
{
return is_resource($this->connection) ? $this->connection : NULL;
}
/**
* Returns the connection reflector.
* @return IDibiReflector
*/
public function getReflector()
{
return new DibiSqliteReflector($this);
}
/**
* Result set driver factory.
* @param resource
* @return IDibiResultDriver
*/
public function createResultDriver($resource)
{
$res = clone $this;
$res->resultSet = $resource;
return $res;
}
/********************* SQL ****************d*g**/
/**
* Encodes data for use in a SQL statement.
* @param mixed value
* @param string type (dibi::TEXT, dibi::BOOL, ...)
* @return string encoded value
* @throws InvalidArgumentException
*/
public function escape($value, $type)
{
switch ($type) {
case dibi::TEXT:
case dibi::BINARY:
return "'" . sqlite_escape_string($value) . "'";
case dibi::IDENTIFIER:
return '[' . strtr($value, '[]', ' ') . ']';
case dibi::BOOL:
return $value ? 1 : 0;
case dibi::DATE:
return $value instanceof DateTime ? $value->format($this->fmtDate) : date($this->fmtDate, $value);
case dibi::DATETIME:
return $value instanceof DateTime ? $value->format($this->fmtDateTime) : date($this->fmtDateTime, $value);
default:
throw new InvalidArgumentException('Unsupported type.');
}
}
/**
* Encodes string for use in a LIKE statement.
* @param string
* @param int
* @return string
*/
public function escapeLike($value, $pos)
{
throw new DibiNotSupportedException;
}
/**
* Decodes data from result set.
* @param string value
* @param string type (dibi::BINARY)
* @return string decoded value
* @throws InvalidArgumentException
*/
public function unescape($value, $type)
{
if ($type === dibi::BINARY) {
return $value;
}
throw new InvalidArgumentException('Unsupported type.');
}
/**
* Injects LIMIT/OFFSET to the SQL query.
* @param string &$sql The SQL query that will be modified.
* @param int $limit
* @param int $offset
* @return void
*/
public function applyLimit(&$sql, $limit, $offset)
{
if ($limit < 0 && $offset < 1) return;
$sql .= ' LIMIT ' . $limit . ($offset > 0 ? ' OFFSET ' . (int) $offset : '');
}
/********************* result set ****************d*g**/
/**
* Returns the number of rows in a result set.
* @return int
*/
public function getRowCount()
{
if (!$this->buffered) {
throw new DibiNotSupportedException('Row count is not available for unbuffered queries.');
}
return sqlite_num_rows($this->resultSet);
}
/**
* Fetches the row at current position and moves the internal cursor to the next position.
* @param bool TRUE for associative array, FALSE for numeric
* @return array array on success, nonarray if no next record
*/
public function fetch($assoc)
{
$row = sqlite_fetch_array($this->resultSet, $assoc ? SQLITE_ASSOC : SQLITE_NUM);
$charset = $this->charset === NULL ? NULL : $this->charset . '//TRANSLIT';
if ($row && ($assoc || $charset)) {
$tmp = array();
foreach ($row as $k => $v) {
if ($charset !== NULL && is_string($v)) {
$v = iconv($this->dbcharset, $charset, $v);
}
$tmp[str_replace(array('[', ']'), '', $k)] = $v;
}
return $tmp;
}
return $row;
}
/**
* Moves cursor position without fetching row.
* @param int the 0-based cursor pos to seek to
* @return boolean TRUE on success, FALSE if unable to seek to specified record
* @throws DibiException
*/
public function seek($row)
{
if (!$this->buffered) {
throw new DibiNotSupportedException('Cannot seek an unbuffered result set.');
}
return sqlite_seek($this->resultSet, $row);
}
/**
* Frees the resources allocated for this result set.
* @return void
*/
public function free()
{
$this->resultSet = NULL;
}
/**
* Returns metadata for all columns in a result set.
* @return array
*/
public function getResultColumns()
{
$count = sqlite_num_fields($this->resultSet);
$columns = array();
for ($i = 0; $i < $count; $i++) {
$name = str_replace(array('[', ']'), '', sqlite_field_name($this->resultSet, $i));
$pair = explode('.', $name);
$columns[] = array(
'name' => isset($pair[1]) ? $pair[1] : $pair[0],
'table' => isset($pair[1]) ? $pair[0] : NULL,
'fullname' => $name,
'nativetype' => NULL,
);
}
return $columns;
}
/**
* Returns the result set resource.
* @return mixed
*/
public function getResultResource()
{
return is_resource($this->resultSet) ? $this->resultSet : NULL;
}
/********************* user defined functions ****************d*g**/
/**
* Registers an user defined function for use in SQL statements.
* @param string function name
* @param mixed callback
* @param int num of arguments
* @return void
*/
public function registerFunction($name, $callback, $numArgs = -1)
{
sqlite_create_function($this->connection, $name, $callback, $numArgs);
}
/**
* Registers an aggregating user defined function for use in SQL statements.
* @param string function name
* @param mixed callback called for each row of the result set
* @param mixed callback called to aggregate the "stepped" data from each row
* @param int num of arguments
* @return void
*/
public function registerAggregateFunction($name, $rowCallback, $agrCallback, $numArgs = -1)
{
sqlite_create_aggregate($this->connection, $name, $rowCallback, $agrCallback, $numArgs);
}
}
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