sql = $sql;
$this->variables = $variables;
}
public function append($querylet) {
assert(!is_null($querylet));
$this->sql .= $querylet->sql;
$this->variables = array_merge($this->variables, $querylet->variables);
}
public function append_sql($sql) {
$this->sql .= $sql;
}
public function add_variable($var) {
$this->variables[] = $var;
}
}
class TagQuerylet {
var $tag;
var $positive;
public function TagQuerylet($tag, $positive) {
$this->tag = $tag;
$this->positive = $positive;
}
}
class ImgQuerylet {
var $qlet;
var $positive;
public function ImgQuerylet($qlet, $positive) {
$this->qlet = $qlet;
$this->positive = $positive;
}
}
// }}}
// {{{ db engines
class DBEngine {
var $name = null;
var $auto_increment = null;
var $create_table_extras = "";
}
class MySQL extends DBEngine {
var $name = "mysql";
var $auto_increment = "INTEGER PRIMARY KEY auto_increment";
var $create_table_extras = "TYPE=INNODB DEFAULT CHARSET='utf8'";
function init($db) {
$db->Execute("SET NAMES utf8;");
}
}
class PostgreSQL extends DBEngine {
var $name = "pgsql";
var $auto_increment = "SERIAL PRIMARY KEY";
function init($db) {
}
}
// }}}
// {{{ cache engines
interface CacheEngine {
var $db;
public function cache_get($key);
public function cache_set($key, $val, $time);
public function cache_delete($key);
}
class MemCache implements CacheEngine {
public function __construct(Database $db) {
$this->db = $db;
}
public function cache_get($key) {
assert(!is_null($key));
$val = $this->db->memcache->get($key);
if($val) {
$this->cache_hits++;
return $val;
}
else {
$this->cache_misses++;
return false;
}
}
public function cache_set($key, $val, $time=0) {
assert(!is_null($key));
$this->db->memcache->set($key, $val, false, $time);
}
public function cache_delete($key) {
assert(!is_null($key));
$this->db->memcache->delete($key);
}
}
// }}}
/*
* A class for controlled database access
*/
class Database {
var $db;
var $extensions;
var $cache_hits = 0, $cache_misses = 0;
var $engine = null;
var $cache = null;
/*
* Create a new database object using connection info
* stored in config.php in the root shimmie folder
*/
public function Database() {
if(is_readable("config.php")) {
require_once "config.php";
$this->engine = new MySQL();
$this->db = @NewADOConnection($database_dsn);
$this->use_memcache = isset($memcache);
if(isset($memcache)) {
$this->cache = new MemCache($this);
}
if(isset($cache)) {
//$matches = array();
//preg_match("#(memcache)://#", $cache, $matches);
}
if($this->db) {
$this->db->SetFetchMode(ADODB_FETCH_ASSOC);
$this->engine->init($this->db);
}
else {
$version = VERSION;
print "
Internal error - Shimmie-$version
Internal error: Could not connect to database
";
exit;
}
if($this->use_memcache) {
$this->memcache = new Memcache;
$this->memcache->pconnect('localhost', 11211) or ($this->use_memcache = false);
}
}
else {
header("Location: install.php");
exit;
}
}
// memcache {{{
public function cache_get($key) {
assert(!is_null($key));
if($this->use_memcache) {
$val = $this->memcache->get($key);
if($val) {
$this->cache_hits++;
return $val;
}
else {
$this->cache_misses++;
}
}
return false;
}
public function cache_set($key, $val, $time=0) {
assert(!is_null($key));
if($this->use_memcache) {
$this->memcache->set($key, $val, false, $time);
}
}
public function cache_delete($key) {
assert(!is_null($key));
if($this->use_memcache) {
$this->memcache->delete($key);
}
}
// }}}
// safety wrapping {{{
public function execute($query, $args=array()) {
$result = $this->db->Execute($query, $args);
if($result === False) {
print "SQL Error: " . $this->db->ErrorMsg();
print "
Query: $query";
print "
Args: "; print_r($args);
exit;
}
return $result;
}
public function get_all($query, $args=array()) {
$result = $this->db->GetAll($query, $args);
if($result === False) {
print "SQL Error: " . $this->db->ErrorMsg();
print "
Query: $query";
print "
Args: "; print_r($args);
exit;
}
return $result;
}
public function get_row($query, $args=array()) {
$result = $this->db->GetRow($query, $args);
if($result === False) {
print "SQL Error: " . $this->db->ErrorMsg();
print "
Query: $query";
print "
Args: "; print_r($args);
exit;
}
if(count($result) == 0) {
return null;
}
else {
return $result;
}
}
public function upgrade_schema($filename) {
$this->install_schema($filename);
}
public function install_schema($filename) {
//print "
upgrading $filename";
global $config;
if($config->get_bool("in_upgrade")) return;
$config->set_bool("in_upgrade", true);
require_once "lib/adodb/adodb-xmlschema03.inc.php";
$schema = new adoSchema($this->db);
$sql = $schema->ParseSchema($filename);
//echo ""; var_dump($sql); echo "
";
$result = $schema->ExecuteSchema();
if(!$result) {
die("Error creating tables from XML schema ($filename)");
}
$config->set_bool("in_upgrade", false);
}
// }}}
}
?>