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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...
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创建一个测试数据表，sql如下：
CREATE TABLE users (
id INTEGER PRIMARY KEY,
name TEXT,
age INTEGER);
数据表信息
这时，可以查看一下表信息：
插入数据
往 users 表中插入一条测试数据...
jQuery Tips and Tricks
...nt and keeping a reference
var newDiv = $("<div />");
newDiv.attr("id", "myNewDiv").appendTo("body");
/* Now whenever I want to append the new div I created,
I can just reference it from the "newDiv" variable */
Checking if an element exists
if ($("#someDiv").length)
{
// It exi...
Check if pull needed in Git
... pull", and the other two as "don't need to pull".
You can get the commit id of any ref using git rev-parse <ref>, so you can do this for master and origin/master and compare them. If they're equal, the branches are the same. If they're unequal, you want to know which is ahead of the other. U...
Overriding a Rails default_scope
...ly have to. You'll probably be better off with named scopes. With that said, you can use with_exclusive_scope to override the default scope if you need to.
Have a look at this question for more details.
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What does git rev-parse do?
...that I've used for:
--verify to verify that the specified object is a valid git object.
--git-dir for displaying the abs/relative path of the the .git directory.
Checking if you're currently within a repository using --is-inside-git-dir or within a work-tree using --is-inside-work-tree
Checking if...
Execution failed app:processDebugResources Android Studio
...buildTools to:
buildToolsVersion "21.0.1"
You will find this setting inside the file app/build.gradle.
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What are file descriptors, explained in simple terms?
...e maintained, where first one is per-process and the second one is system wide. FD in per-process table (i.e fdtable) is not unique system wide. However it maps to v-node table that contains the system wide unique entries. So when you call fopen() and fileno() function to check the descriptor then y...
Jump to matching XML tags in Vim
...t.vim . You can find it here: http://www.vim.org/scripts/script.php?script_id=39 . It was created pretty much the exact purpose you describe.
Install that, place your cursor on the body of the tag (not the <>, else it'll match those) and press % to jump to the other tag. See the script's page...
Adding IN clause List to a JPA Query
...e IN :inclList
If you're using an older version of Hibernate as your provider you have to write:
el.name IN (:inclList)
but that is a bug (HHH-5126) (EDIT: which has been resolved by now).
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Number of processors/cores in command line
...ut. I was hoping since it's a posix tool it'd work on Linux/Solaris so I didn't have to use branching.
– Brian Vandenberg
Sep 11 '15 at 16:59
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