public Node getNodeByIdentity(String identity) {
        return new SelectSql(getSqlTemplate())
                .select()
                .all()
                .from()
                .table(getTableName())
                .where("identity = ?", identity)
                .single(RshHandler.NODE_RSH);
    }
@author Robert HG (254963746@qq.com) on 6/6/15.
lts-admin/src/main/java/com/github/ltsopensource/admin/access/memory/NodeMemCacheAccess.java