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App Inventor 2 手机蓝牙及语音控制 - App Inventor 2 中文网 - 清泛IT论坛，有思想、有深度
...rduino的学习，我们对两个平台已经初步有了认识和了解，如何打通两个平台，实现利用手机对Arduino设备进行控制呢？
蓝牙是一个非常成熟的无限近程控制技术，通过蓝牙，我们可以将两者有机结合，再加上讯飞语音，甚至...
App Inventor 2 颜色代码块 · App Inventor 2 中文网
...块
App Inventor 中的颜色如何发挥作用？
基本颜色
合成颜色
分解颜色
颜色代码块主要分为三种类型：
基本颜色
合成颜色
分解颜色
App Inventor 中的颜色如何发挥作用？
在内部，App...
任何组件块 · App Inventor 2 中文网
... 参数为 true 组件。
考虑以下事件处理伪代码，看看它是如何工作的：
发生一个事件，例如用户单击名为 Button1 的按钮。
组件被初始化为Button1。
notAlreadyHandled 初始化为true。
App Inventor 检查 when Button1.Click 是否存在。
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Multiple Updates in MySQL
...e, is there a way to update multiple rows at once (as in, in one query) in MySQL?
17 Answers
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Creation timestamp and last update timestamp with Hibernate and MySQL
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I would do this using a MySQL trigger so that even if the full entity is not saved or is modified by any external application or manual query, it'll still update these fields.
– Webnet
Jul 25 '13 at 12:09
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mysql create user if not exists
I have a query to check mysql users list for create new user.
2 Answers
2
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How to move columns in a MySQL table?
Currently I am having the following MySQL table: Employees (empID, empName, department);
4 Answers
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Unique constraint that allows empty values in MySQL
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Yes, you can do this. See the MySQL reference (version 5.5).
A UNIQUE index creates a constraint such that all values in the index must be distinct. An error occurs if you try to add a new row with a key value that matches an existing row. For all eng...
How to select the last record of a table in SQL?
...s something like
Sql Server
SELECT TOP 1 * FROM Table ORDER BY ID DESC
MySql
SELECT * FROM Table ORDER BY ID DESC LIMIT 1
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MySQL/SQL: Group by date only on a Datetime column
...son. I would expect it to fail anywhere else as well. Can you confirm that MySQL actually handles this query?
– Tomalak
Dec 14 '08 at 15:56
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