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常用Git命令汇总 - 开源 & Github - 清泛网 - 专注C/C++及内核技术
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#改变暂存区的修改（其实是重置HEAD，将指定版本库的内容状态去覆盖暂存区，从而达到暂存区的改变）
git reset <file> #从暂存区恢复到工作区（不指定版本id，则默认为最后一次提交的版本id）
git r...
MySQL “incorrect string value” error when save unicode string in Django
...blem for me. The root cause being:
You cannot store 4-byte characters in MySQL with the utf-8 character set.
MySQL has a 3 byte limit on utf-8 characters (yes, it's wack, nicely summed up by a Django developer here)
To solve this you need to:
Change your MySQL database, table and columns to u...
PHP/MySQL insert row then get 'id'
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$link = mysqli_connect('127.0.0.1', 'my_user', 'my_pass', 'my_db');
mysqli_query($link, "INSERT INTO mytable (1, 2, 3, 'blah')");
$id = mysqli_insert_id($link);
See mysqli_insert_id().
Whatever you do, don't insert and then do a "...
ERROR 1396 (HY000): Operation CREATE USER failed for 'jack'@'localhost'
...seem to be unable to re-create a simple user I've deleted, even as root in MySQL.
24 Answers
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App Inventor 2 人脸识别App开发 - 第三方API接入的通用方法 · App Inventor 2 中文网
...建一个应用以获得API调用时必要的api_key及api_secret。
如何理解api_key及api_secret：可以类比为 API Key是用户ID（用于标识用户），Secret Key是密码（用于鉴权）。“你需要两个不同的密钥，一个告诉他们你是谁，另一个证明你就是...
Repair all tables in one go
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from command line you can use:
mysqlcheck -A --auto-repair
http://dev.mysql.com/doc/refman/5.0/en/mysqlcheck.html
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PHPMyAdmin Default login password [closed]
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If you are using AMPPS, the pass is mysql
– Cheborra
Aug 2 '14 at 2:43
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mysql blob大小配置介绍 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
...理器（如数据库管理器）不去理会文件是什么，而是关心如何去处理它。但也有专家强调，这种处理大数据对象的方法是把双刃剑，它有可能引发一些问题，如存储的二进制文件过大，会使数据库的性能下降。在数据库中存放体...
django test app error - Got an error creating the test database: permission denied to create databas
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Though the OP used postgresql, if you are using mysql you will have the same error. You can fix it for mysql with: => GRANT ALL ON *.* TO django@localhost; I originally tried to only GRANT CREATE... but then could not SELECT or DROP the created database. This essentia...
App Inventor 2 低功耗蓝牙(BLE) 硬件接入、数据通信及IO控制 - App Invent...
...本文主要介绍一款较为通用、价格低廉的BLE设备从零开始如何利用App Inventor 2开发一款自己专属的手机蓝牙App应用。BLE与经典蓝牙的区别可参考：《低功耗蓝牙(BLE) 和 经典蓝牙(SPP) 的区别》。本文主要通过一款常见的BLE硬件接入...