function getReferrers($table)
{
$this->clean($table);
$status = $this->beginTransaction();
if ($status != 0) {
return -1;
}
$c_schema = $this->_schema;
$this->clean($c_schema);
$sql = "\n\t\t\tSELECT\n\t\t\t\tpn.nspname,\n\t\t\t\tpl.relname,\n\t\t\t\tpc.conname,\n\t\t\t\tpg_catalog.pg_get_constraintdef(pc.oid) AS consrc\n\t\t\tFROM\n\t\t\t\tpg_catalog.pg_constraint pc,\n\t\t\t\tpg_catalog.pg_namespace pn,\n\t\t\t\tpg_catalog.pg_class pl\n\t\t\tWHERE\n\t\t\t\tpc.connamespace = pn.oid\n\t\t\t\tAND pc.conrelid = pl.oid\n\t\t\t\tAND pc.contype = 'f'\n\t\t\t\tAND confrelid = (SELECT oid FROM pg_catalog.pg_class WHERE relname='{$table}'\n\t\t\t\t\tAND relnamespace = (SELECT oid FROM pg_catalog.pg_namespace\n\t\t\t\t\tWHERE nspname='{$c_schema}'))\n\t\t\tORDER BY 1,2,3\n\t\t";
return $this->selectSet($sql);
}