/**
* get instance of singleton
*
* @access public
* @static
* @param array $options
* @throws Exception
* @return zerobin_db
*/
public static function getInstance($options = null)
{
// if needed initialize the singleton
if (!self::$_instance instanceof zerobin_db) {
self::$_instance = new self();
}
if (is_array($options)) {
// set table prefix if given
if (array_key_exists('tbl', $options)) {
self::$_prefix = $options['tbl'];
}
// initialize the db connection with new options
if (array_key_exists('dsn', $options) && array_key_exists('usr', $options) && array_key_exists('pwd', $options) && array_key_exists('opt', $options)) {
self::$_db = new PDO($options['dsn'], $options['usr'], $options['pwd'], $options['opt']);
// check if the database contains the required tables
self::$_type = strtolower(substr($options['dsn'], 0, strpos($options['dsn'], ':')));
switch (self::$_type) {
case 'ibm':
$sql = 'SELECT tabname FROM SYSCAT.TABLES ';
break;
case 'informix':
$sql = 'SELECT tabname FROM systables ';
break;
case 'mssql':
$sql = "SELECT name FROM sysobjects " . "WHERE type = 'U' ORDER BY name";
break;
case 'mysql':
$sql = 'SHOW TABLES';
break;
case 'oci':
$sql = 'SELECT table_name FROM all_tables';
break;
case 'pgsql':
$sql = "SELECT c.relname AS table_name " . "FROM pg_class c, pg_user u " . "WHERE c.relowner = u.usesysid AND c.relkind = 'r' " . "AND NOT EXISTS (SELECT 1 FROM pg_views WHERE viewname = c.relname) " . "AND c.relname !~ '^(pg_|sql_)' " . "UNION " . "SELECT c.relname AS table_name " . "FROM pg_class c " . "WHERE c.relkind = 'r' " . "AND NOT EXISTS (SELECT 1 FROM pg_views WHERE viewname = c.relname) " . "AND NOT EXISTS (SELECT 1 FROM pg_user WHERE usesysid = c.relowner) " . "AND c.relname !~ '^pg_'";
break;
case 'sqlite':
$sql = "SELECT name FROM sqlite_master WHERE type='table' " . "UNION ALL SELECT name FROM sqlite_temp_master " . "WHERE type='table' ORDER BY name";
break;
default:
throw new Exception('PDO type ' . self::$_type . ' is currently not supported.');
}
$statement = self::$_db->query($sql);
$tables = $statement->fetchAll(PDO::FETCH_COLUMN, 0);
// create paste table if needed
if (!array_key_exists(self::$_prefix . 'paste', $tables)) {
self::$_db->exec('CREATE TABLE ' . self::$_prefix . 'paste ( ' . 'dataid CHAR(16), ' . 'data TEXT, ' . 'postdate INT, ' . 'expiredate INT, ' . 'opendiscussion INT, ' . 'burnafterreading INT );');
}
// create comment table if needed
if (!array_key_exists(self::$_prefix . 'comment', $tables)) {
self::$_db->exec('CREATE TABLE ' . self::$_prefix . 'comment ( ' . 'dataid CHAR(16), ' . 'pasteid CHAR(16), ' . 'parentid CHAR(16), ' . 'data TEXT, ' . 'nickname VARCHAR(255), ' . 'vizhash TEXT, ' . 'postdate INT );');
}
}
}
return parent::$_instance;
}
/**
* get instance of singleton
*
* @access public
* @static
* @param array $options
* @throws Exception
* @return zerobin_db
*/
public static function getInstance($options = null)
{
// if needed initialize the singleton
if (!self::$_instance instanceof zerobin_db) {
self::$_instance = new self();
}
if (is_array($options)) {
// set table prefix if given
if (array_key_exists('tbl', $options)) {
self::$_prefix = $options['tbl'];
}
// initialize the db connection with new options
if (array_key_exists('dsn', $options) && array_key_exists('usr', $options) && array_key_exists('pwd', $options) && array_key_exists('opt', $options)) {
// set default options
$options['opt'][PDO::ATTR_ERRMODE] = PDO::ERRMODE_EXCEPTION;
$options['opt'][PDO::ATTR_EMULATE_PREPARES] = false;
$options['opt'][PDO::ATTR_PERSISTENT] = true;
$db_tables_exist = true;
// setup type and dabase connection
self::$_type = strtolower(substr($options['dsn'], 0, strpos($options['dsn'], ':')));
$tableQuery = self::_getTableQuery(self::$_type);
self::$_db = new PDO($options['dsn'], $options['usr'], $options['pwd'], $options['opt']);
// check if the database contains the required tables
$tables = self::$_db->query($tableQuery)->fetchAll(PDO::FETCH_COLUMN, 0);
// create paste table if necessary
if (!in_array(self::$_prefix . 'paste', $tables)) {
self::_createPasteTable();
$db_tables_exist = false;
}
// create comment table if necessary
if (!in_array(self::$_prefix . 'comment', $tables)) {
self::_createCommentTable();
$db_tables_exist = false;
}
// create config table if necessary
$db_version = zerobin::VERSION;
if (!in_array(self::$_prefix . 'config', $tables)) {
self::_createConfigTable();
// if we only needed to create the config table, the DB is older then 0.22
if ($db_tables_exist) {
$db_version = '0.21';
}
} else {
$db_version = self::_getConfig('VERSION');
}
// update database structure if necessary
if (version_compare($db_version, zerobin::VERSION, '<')) {
self::_upgradeDatabase($db_version);
}
}
}
return self::$_instance;
}
