...m_todo_index ON alarms(todo); Note also that SQLite saves the schema and all information about tables in the database itself, in a magic table named sqlite_master, and it's also possible to execute normal SQL queries against that table. For example, the documentation link above shows how to derive...

... Had a similar issue and this fixed my problem – Callat Sep 4 '17 at 15:44 1 wow, so simple. w...

...Except for one thing. You'll get the error "child is not a function". The call to exec() executes the command - no need to call child(). Unfortunately, the callback isn't called whenever the child process has something to output - it is called only when the child process exits. Sometimes that's OK a...

... and version control that instead. This way it is a flat text file. Personally I suggest that you keep both a data dump, and a schema dump. This way using diff it becomes fairly easy to see what changed in the schema from revision to revision. If you are making big changes, you should have a secon...

... shell> ldd /path/to/nginx libluajit-<VERSION>.so => not found 此类问题通常使用ldconfig命令就能解决： shell> echo "/usr/local/lib" > /etc/ld.so.conf.d/usr_local_lib.conf shell> ldconfig 再试着启动Nginx看看，应该就OK了。 应用 我们先用一个简单的程序...

...章（我的hello world）、环境搭建成功后的第一个测试… 问题的提出 相传古时候有个退休的程序员，在家闲来无事，决定修习书法之道。第一日，备好笔墨纸砚，便挥毫写下一行大字：“hello, world”。 学过编程语言的人都笑了...

...automatic variables) 3) 多线程应用中被几个任务共享的变量 问题： 1)一个参数既可以是const还可以是volatile吗？解释为什么。 2); 一个指针可以是volatile 吗？解释为什么。 3); 下面的函数有什么错误： int square(volatile int *ptr) { ...

...免费”，而“增值服务”收费，但是这种商业模式带来的问题是，一个越来越庞大臃肿的应用，一个越来越脱离其核心功能的应用。 总结 可见，WhatsApp成功的一大因素就是“专注”，坚持其工具属性，因为是付费应用，因此就...

...不是很熟悉命令行，可以使用之前的方法安装。如果没有问题，开始吧。 下载并解压 Git 源代码： $ curl -O http://kernel.org/pub/software/scm/git/git-1.7.5.tar.bz2 $ tar xzvf git-1.7.5 打开目录，编译 Git： $ cd git-1.7.5 $ ./configure --...

... jemalloc，接替系统的内存分配函数，可极大消除内存碎片问题。 valgrind 内存泄漏 jemalloc