function sync_table($src, $dst, $cond = array(), $transl = "", $modes = array("INSERT", "UPDATE", "DELETE"))
{
global $SYNC_STATUS;
global $SCHEMA;
global $ERROR;
global $debug;
$tdef = $SCHEMA[$src];
$version = _db_extfield($src, "version");
$limit = @$SYNC_STATUS[$src][$dst];
if ($limit) {
$cond["{$version} >"] = $limit;
}
$qstruct = array("TABLE" => $src, "FIELD" => array(), "COND" => $cond, "ORDER" => "", "START" => 0, "COUNT" => 0);
$databases = array();
$q2 = _db_mangle_query($databases, $qstruct);
// currently only 1 database supported
$database = key($databases);
$query = _db_make_query($database, $subqs, $q2);
$env = array("DB" => $database, "ARG" => $subqs, "CB_PROCESS" => "_sync_cb_table", "SRC" => $src, "DST" => $dst, "TRANSL" => $transl, "MODES" => $modes, "version" => $version, "MAXTIME" => $limit);
$ok = _db_multiquery($env, false, $query, array("_db_cb_process_data"));
if (!$ok) {
if (!$ERROR) {
$ERROR = "unknown sync error";
}
if ($debug) {
echo "sync oops............................ {$ERROR} <br>\n";
}
return false;
}
$SYNC_STATUS[$src][$dst] = $env["MAXTIME"];
return true;
}
function _db_create_view($NEW, $alias, $qstruct)
{
global $SCHEMA;
$oldschema = $SCHEMA;
$SCHEMA = $NEW;
$databases = array();
$q2 = _db_mangle_query($databases, $qstruct);
if (count($databases) == 1) {
$database = key($databases);
$query = _db_make_query($database, $subqs, $q2);
} else {
$SCHEMA = $oldschema;
return "/* cannot create distributed view '{$alias}' */\n";
}
$SCHEMA = $oldschema;
return "drop view if exists {$alias};\ncreate view {$alias} as {$query};\n\n";
}
function _db_read($qstruct)
{
global $ERROR;
global $debug;
if ($debug) {
echo "_db_read raw data: ";
print_r($qstruct);
echo "<br>\n";
}
$databases = array();
$q2 = _db_mangle_query($databases, $qstruct);
// currently only 1 database supported
$database = key($databases);
$mainquery = _db_make_query($database, $subqs, $q2);
$query = $mainquery;
if ($subqs) {
foreach ($subqs as $name => $tuple) {
$joinfields = $tuple[0];
$subquery = $tuple[1];
if ($joinfields) {
if (is_array($joinfields)) {
$joinfields = implode(",", $joinfields);
}
$subquery = "select * from ({$mainquery}) mainquery join ({$subquery}) subquery using({$joinfields})";
}
if ($debug) {
$subquery = "/* alias='{$name}' joinfields='{$joinfields}' */ {$subquery}";
}
$query .= "; {$subquery}";
}
}
$env = array("DB" => $database, "ARG" => $subqs, "CB_PROCESS" => "_db_cb_make_keys");
$ok = _db_multiquery($env, false, $query, array("_db_cb_process_data", "_db_cb_process_subdata"));
if (!$ok) {
if (!$ERROR) {
$ERROR = "unknown retrieval error";
}
if ($debug) {
echo "oops............................ {$ERROR} <br>\n";
}
return array();
}
$res = array_shift($env["RES"]);
if ($res) {
$res = _db_do_datasplit($res, $env);
if ($debug) {
echo "got data.<br>\n";
}
}
return $res;
}