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App Inventor 2 试验组件 · App Inventor 2 中文网
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使用已更新的标签和值启动事件。
Firebase错误时(消息)
表示与 Firebase 的通信发出错误信号。
第一项已删除时(值)
由 删除第一项 函数触发的事件。参数“值”是列表中第一个对象,现在已被删除。
以获得值时(标...
select、poll、epoll之间的区别总结[整理] - C/C++ - 清泛网 - 专注C/C++及内核技术
...等待队列中并不代表进程已经睡眠了)。在设备收到一条消息(网络设备)或填写完文件数据(磁盘设备)后,会唤醒设备等待队列上睡眠的进程,这时current便被唤醒了。
(6)poll方法返回时会返回一个描述读写操作是否就绪...
得合伙人者得天下:腾讯五虎、新东方三驾马车、携程四君子、复旦五虎 - 资...
...们魏一搏打了个电话,当时只是想告诉他自己要创业了的消息,没想到几分钟之后魏一博回电说决定一起创业。两人分别卖掉自己的一套房子,凑到了150万元的创业启动资金。
上下铺兄弟的十年试错之旅
学校:清华大学
创...
What is the proper REST response code for a valid request but an empty data?
...hat it was a client error and thus the whole class of client error codes (4xx) is not fitting.
More importantly, 404 can happen for a number of technical reasons. E.g. the application being temporarily deactivated or uninstalled on the server, proxy connection issues and whatnot. Therefore the clie...
Using getopts to process long and short command line options
...FILE="$2"; shift 2 ;;
--minheap )
JAVA_MISC_OPT="$JAVA_MISC_OPT -XX:MinHeapFreeRatio=$2"; shift 2 ;;
--maxheap )
JAVA_MISC_OPT="$JAVA_MISC_OPT -XX:MaxHeapFreeRatio=$2"; shift 2 ;;
-- ) shift; break ;;
* ) break ;;
esac
done
This lets you specify options like --verbose...
Spring @Transactional - isolation, propagation
...t is either using xml Or annotation
manager.setPropagationBehavior(XX);
manager.setIsolationLevelName(XX);
status = manager.getTransaction(Def);
}
public void commitTransaction()
{
if(status.isCompleted()){
...
What is an undefined reference/unresolved external symbol error and how do I fix it?
...rror LNK2001: unresolved external symbol "void __cdecl foo(void)" (?foo@@YAXXZ)
1>test2.obj : error LNK2001: unresolved external symbol "int x" (?x@@3HA)
1>test2.obj : error LNK2001: unresolved external symbol "public: virtual __thiscall A::~A(void)" (??1A@@UAE@XZ)
1>test2.obj : error LNK20...
What is the difference between partitioning and bucketing a table in Hive ?
... While creating table you can specify like CLUSTERED BY (employee_id) INTO XX BUCKETS; where XX is the number of buckets . Bucketing has several advantages. The number of buckets is fixed so it does not fluctuate with data. If two tables are bucketed by employee_id, Hive can create a logically corr...
廉价共享存储解决方案2-drbd+cman+gfs2 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...配置文件的 net 选项中
allow-two-primaries yes;
安装 cman 底层消息通讯 + 全局锁功能
ccs_tool create gfscluster
ccs_tool addnode -n 1 -v 1 gfs_1
ccs_tool addnode -n 2 -v 1 gfs_2
查看节点
ccs_tool lsnode
3.5再次启动 drbd 服务
service drbd stop
如果之...
程序员之网络安全系列(二):如何安全保存用户密码及哈希算法 - 更多技术 ...
.... 典型的哈希算法包括 MD2、MD4、MD5 和 SHA-1
Hash算法是给消息生成摘要,那么什么是摘要呢?
举个例子: > 比如你给你女朋友写了一封邮件,确保没被人改过,你可以生成这样一份摘要 “第50个字是我,第100个字是爱, 第998个...