@Table("BA_KV")
public class KV {
	@Name
	@Column("k")
	private String k;
	@Column("v")
	private int v;
	@Column("c")
	private String c;

	public String getK() {
		return k;
	}

	public void setK(String k) {
		this.k = k;
	}

	public String getC() {
		return c;
	}

	public void setC(String c) {
		this.c = c;
	}

	public int getV() {
		return v;
	}

	public void setV(int v) {
		this.v = v;
	}

}

@IocBean
public class OrderService {
	@Inject
	private Dao dao;

	/**
	 * 生成订单流水号，格式：20160721001，
	 * @return
	 */
	public synchronized String generaterNextNumber() {
		Cnd cnd = Cnd.NEW();
		cnd.and("c", "=", "订单");
		String k = Times.format("yyyyMMdd", Times.now());
		cnd.and("k", "=", k);
		KV kv = dao.fetch(KV.class, cnd);
		if (kv == null) {
			kv = new KV();
			kv.setK(k);
			kv.setV(1);
			kv.setC("订单");
			dao.insert(kv);
		} else {
			kv.setV(kv.getV() + 1);
			dao.update(kv);
		}
		int v = kv.getV();
		return String.format("%s%03d", k, v);
	}
	
	

}