+/*
+ Converts encoding name to mysql standard.
+*/
+function get_mysql_encoding_name($encoding)
+{
+ $db_encoding = array(
+ 'UTF-8' => 'utf8',
+ 'ISO-8859-1' => 'latin1',
+ 'ISO-8859-2' => 'latin2',
+ 'ISO-8859-7' => 'greek',
+ 'ISO-8859-8' => 'hebrew',
+ 'ISO-8859-9' => 'latin5',
+ 'ISO-8859-13' => 'latin7',
+ 'KOI8-R' => 'koi8r',
+ 'KOI8-U' => 'koi8u',
+ 'CP850' => 'cp850',
+ 'CP866' => 'cp866',
+ 'CP932' => 'cp932',
+ 'CP1250' => 'cp1250',
+ 'CP1251' => 'cp1251',
+ 'CP1252' => 'latin1',
+ 'CP1256' => 'cp1256',
+ 'CP1257' => 'cp1257',
+ 'GB2312' => 'gb2312',
+ 'EUC-JP' => 'ujis',
+ 'EUC-KR' => 'euckr',
+ 'BIG5' => 'big5',
+ 'GBK' => 'gbk',
+ 'SHIFT_JIS' => 'sjis',
+ 'TIS-620' => 'tis620',
+ 'ASCII' => 'ascii',
+ );
+ $encoding = strtoupper($encoding);
+
+ return isset($db_encoding[$encoding]) ? $db_encoding[$encoding] : null;
+}
+
+/*
+ Returns 'best' collation for various locale language codes
+*/
+function get_mysql_collation($lang=null)
+{
+ if (!$lang)
+ $lang = substr($_SESSION['language']->code, 0, 2);
+
+ $db_collation = array(
+ 'is' => 'icelandic',
+ 'lv' => 'latvian',
+ 'ro' => 'romanian',
+ 'sl' => 'slovenian',
+ 'pl' => 'polish',
+ 'et' => 'estonian',
+ 'es' => 'spanish', // or 'spanish2',
+ 'sw' => 'swedish',
+ 'tr' => 'turkish',
+ 'cs' => 'czech',
+ 'da' => 'danish',
+ 'lt' => 'lithuanian',
+ 'sk' => 'slovak',
+ 'sp' => 'spanish2',
+ 'fa' => 'persian',
+ 'hu' => 'hungarian',
+ 'fr' => 'roman',
+ 'it' => 'roman',
+ );
+
+ return 'utf8_'.(isset($db_collation[$lang]) ? $db_collation[$lang] : 'general').'_ci';
+}
+/*
+ Later we assume that database with version less than 2.4 is old database,
+ which is subject to invalid encodings on text columns,
+ so no SET NAMES or equivalent should be used.
+*/
+function db_fixed()
+{
+ $result = db_query("SELECT value FROM ".TB_PREF."sys_prefs WHERE name='version_id'");
+ $data = db_fetch($result);
+ return !db_num_rows($result) // new database is fixed by default
+ || ($data[0] > "2.3rc");
+}
+/*
+ Check database default charset.
+*/
+function db_get_charset()
+{
+ $result = db_query("SELECT @@character_set_database");
+ $var = db_fetch($result);
+ return $var[0];
+}
+
+/*
+ Set mysql client encoding.
+ Default is is encoding used by default language.
+*/
+function db_set_encoding($ui_encoding=null)
+{
+ global $dflt_lang, $installed_languages;
+
+ if (!isset($ui_encoding))
+ {
+ $lang = array_search_value($dflt_lang, $installed_languages, 'code');
+ $ui_encoding = strtoupper($lang['encoding']);
+ }
+
+ if ($mysql_enc = get_mysql_encoding_name($ui_encoding))
+ mysql_set_charset($mysql_enc);
+}
+
+/*
+ Connects application to company database.
+*/