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串口通信器使用指导 · App Inventor 2 中文网
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视频介绍了 App Inventor 2 串口组件的使用方法，以及如何利用手机串口与 Arduino 硬件进行文本通信。串口通信波特率：9600。
方法与错误
入口
作用
InitializeSerial() / OpenSeria...
Easiest way to activate PHP and MySQL on Mac OS 10.6 (Snow Leopard), 10.7 (Lion), 10.8 (Mountain Lio
What is the easiest way to activate PHP and MySQL on Mac OS 10.6 (Snow Leopard), 10.7 (Lion), 10.8 (Mountain Lion)?
12 Answ...
MySql server startup error 'The server quit without updating PID file '
On Snow Leopard, starting MySQL gives the following error:
50 Answers
50
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App Inventor 2 文本加密教程 - 数据安全与加密方案 · App Inventor 2 中文网
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概述
方案一：Caesar密码（凯撒密码）
加密
解密
使用示例
方案二：XOR异或加密
方案三：Base64编码
使用WebView
方案四：SHA-256哈希（推荐用于密码存储...
LEGO EV3 机器人传感器面板 · App Inventor 2 中文网
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Button_Disconnect.Click 事件断开蓝牙连接、禁用定时器并重置屏幕标题。
代码逻辑：
当 Button_Disconnect.Click 时
调用 BluetoothClient1.Disconnect
设置 Clock1.TimerEnabled 为 false
设置 Screen1.Title 为 "Disconnected"
通信协议
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mysql error 1364 Field doesn't have a default values
...does not address the root cause either because the root cause was a bug in MySQL that was fixed in v5.7.1 - see the answer by B98: stackoverflow.com/a/29854279/5389997 Removing strict_trans_table sql mode makes MySQL more prone to data quality errors, so removing it is not a really good advice.
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MySQL DROP all tables, ignoring foreign keys
Is there a nice easy way to drop all tables from a MySQL database, ignoring any foreign key constraints that may be in there?
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生物识别使用指导 · App Inventor 2 中文网
...按钮验证，通过后显示隐私内容；本机不支持时提示改用密码：
各案例独立使用；组合到同一屏幕时，将同名事件的处理合并到一个事件积木中。
when 按钮1.Click() {
if (生物识别1.IsAvailable()) {
生物识别1.Authenticate("查看隐私...
Import SQL file into mysql
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From the mysql console:
mysql> use DATABASE_NAME;
mysql> source path/to/file.sql;
make sure there is no slash before path if you are referring to a relative path... it took me a while to realize that! lol
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Skip certain tables with mysqldump
Is there a way to restrict certain tables from the mysqldump command?
10 Answers
10
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