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adb not finding my device / phone (MacOS X)
...w on port 5037 *
* daemon started successfully *
List of devices attached
123ABC456DEF001 device
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内存优化总结:ptmalloc、tcmalloc和jemalloc - 操作系统(内核) - 清泛网 - ...
...内存到CentralCache里。 解决了ptmalloc2中arena之间不能迁移的问题。
Tcmalloc占用更少的额外空间。例如,分配N个8字节对象可能要使用大约8N * 1.01字节的空间。即,多用百分之一的空间。Ptmalloc2使用最少8字节描述一个chunk。
更快。...
Database development mistakes made by application developers [closed]
...e NOT NULL and FOREIGN KEY if I’ll always control my database input with php?
Are foreign keys really necessary in a database design?
Are foreign keys really necessary in a database design?
3. Using natural rather than surrogate (technical) primary keys
Natural keys are keys based on externally...
getMinutes() 0-9 - How to display two digit numbers?
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(condition?true:false) in PHP you can omit the true statement (condition?:false) in JS you would then use (condition||false) Ternary operator en.wikipedia.org/wiki/Ternary_operation
– llange
Mar 16 '19 at 9:53
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Difference between git stash pop and git stash apply
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as @briankip's answer notes below, if there are conflicts when a stash is popped, pop will not remove the stash (and will behave exactly l...
String formatting in Python 3
...nce at 0x00BF7260>'
"games: {:>3}".format(player1.games) # 'games: 123'
"games: {:>3}".format(player2.games) # 'games: 4'
"games: {:0>3}".format(player2.games) # 'games: 004'
Note: As others pointed out, the new format does not supersede the former, both are available both in Py...
App Inventor 2 SQLite 拓展:超流行兼容主流SQL语法的迷你本地数据库引擎 ...
...但TaifunSQLite是收费的,美刀。
.aix 拓展下载:
cn.fun123.SQLite.aix
SQLite
SQLite 是 Android 内置的小型、快速、独立的 SQL(结构化查询语言)数据库引擎。
SQL 语句用于创建、选择、更新和删除一个或多个表中的...
Effect of a Bitwise Operator on a Boolean in Java
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The operators &, ^, and | are bitwise operators when the operands are primitive integral t...
Python os.path.join on Windows
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To be even more pedantic, the most python doc consistent answer would be:
mypath = os.path.jo...
vim, switching between files rapidly using vanilla Vim (no plugins)
....html normal! mH
autocmd BufLeave *.js normal! mJ
autocmd BufLeave *.php normal! mP
augroup END
I recently found this gem in someone else's ~/.vimrc. It creates a file mark at the exact position of the cursor whenever you leave a buffer so that, wherever you are, 'J jumps to the latest Java...
