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电脑上的文件如何拷贝到模拟器中？ - App应用开发 - 清泛IT社区，为创新赋能！
Q：电脑上的文件如何拷贝到模拟器中？ A：文件拷贝的具体步骤如下（这里以mumu模拟器为例展示，其他的模拟器也都是大同小异）：模拟器菜单，文件传输功能：打开模拟器与电脑的共享目录：将想要传输的文件拷贝到共享目...
AppInventor2 文本和数字如何转换？ - App应用开发 - 清泛IT社区，为创新赋能！
Q：AppInventor2 文本和数字如何转换？
A：先来一个文本转数字的情况：
定义一个变量赋初值 数字0，然后将文本设置给它，事实证明这时它自动变成了文本类型，而不再是数字。因此此方案行不通。
最彻底的方案：
[hide]
直...
如何实现循环振动、循环播放音效 - App Inventor 2 中文网 - 清泛IT社区，为创新赋能！
...，但是每次计时结束后播放时的音效只是一次性的，请问如何实现在没有点击停止按钮的情况下循环振动、循环播放音效，点击停止按钮后停止振动、停止音效播放。
StackOverflow程序员推荐：每个程序员都应读的30本书 - 杂谈 - 清泛网 - 专...
...：774
这本书简洁易读，会教给你三件事：C 编程语言；如何像程序员一样思考；底层计算模型。（这对理解“底层”非常重要）—— Nathan
5. 《算法导论》
推荐数：671
《代码大全》教你如何正确编程；《人月神话》教你如...
log messages appearing twice with Python Logging
...g is left set to True. A
common scenario is to attach handlers only to the root logger, and to
let propagation take care of the rest.
So, if you want a custom handler on "test", and you don't want its messages also going to the root handler, the answer is simple: turn off its propagate flag:
logger...
Saving timestamp in mysql table using php
I have a field in a MySQL table which has a timestamp data type. I am saving data into that table. But when I pass the timestamp ( 1299762201428 ) to the record, it automatically saves the value 0000-00-00 00:00:00 into that table.
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How do I escape reserved words used as column names? MySQL/Create Table
...and one problem is a class may have a field name key which is a reserved MySQL keyword. How do I escape it in a create table statement? (Note: The other problem below is text must be a fixed size to be indexed/unique)
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MySQL/Amazon RDS error: “you do not have SUPER privileges…”
I'm attempting to copy my mysql database from an Amazon EC2 to an RDS:
7 Answers
7
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Having both a Created and Last Updated timestamp columns in MySQL 4.0
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From the MySQL 5.5 documentation:
One TIMESTAMP column in a table can have the current timestamp as the default value for initializing the column, as the auto-update value, or both. It is not possible to have the current timestamp...
Invalid default value for 'create_date' timestamp field
...t ignore this option. This is server option. If you have access to my.ini (mysql configuration file), then remove NO_ZERO_DATE from sql-mode option and restart server.
– Devart
Feb 8 '12 at 11:44
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