uqm.setPreFix(tblName);
List<UuidModel> list = this.getByCondition(uqm,1,100);
if(list==null || list.size()==0){
//2：如果找不到，说明是第一次用，那么nextUuid=1,同时向tbl_uuid新增一条数据
UuidModel um = new UuidModel();
um.setNum(1);
um.setPreFix(tblName);
this.create(um);
return 1;
}else{
//3：如果找到了，就对num+1,这就是nextuuid，同时修改这条数据
UuidModel um = list.get(0);
int num = um.getNum()+1;
um.setNum(num);
this.update(um);
return num;
}