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Simplest way to profile a PHP script
... all the data
$select_query = "SELECT * FROM data_table";
$result = mysql_query($select_query);
prof_flag("Retrieve data");
$rows = array();
$found_data=false;
while($r = mysql_fetch_assoc($result))
{
$found_data=true;
$rows[] = $r;
}
prof_flag("Close DB");
...
Deploying my application at the root in Tomcat
I have the war file of my application. I need to deploy this at the root level. The current URL is http://localhost:8080/war_name/application_name .
...
App Inventor 2 图片处理教程 - 缩放、裁剪、存储与转换 · App Inventor 2 中文网
...？
Q3: 图片保存到相册后手机相册看不到？
Q4: 如何获取图片的宽高？
总结
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概述
本文介绍App Inventor 2中常见的图片处理需求：
图片缩放（等比/固定尺寸）
图片存储到本地/相...
How to get root access on Android emulator?
...roid SDK versions(from 1.5 to 2.3.3), and I tried many methods for getting root in Android emulator. I don't use any Android device and test everything on emulator(AVD).
...
SQL: How to perform string does not equal
... Just noticed that the <=> operator only exists in the MySQL world, for more info see what is <=>
– Top-Master
Apr 27 '19 at 6:18
...
Extract a dplyr tbl column as a vector
...masked from 'package:base':
#>
#> intersect, setdiff, setequal, union
db <- src_sqlite(tempfile(), create = TRUE)
iris2 <- copy_to(db, iris)
vec <- pull(iris2, Species)
head(vec)
#> [1] "setosa" "setosa" "setosa" "setosa" "setosa" "setosa"
...
INSERT … ON DUPLICATE KEY (do nothing)
... uses resources for the second action.
Use INSERT IGNORE ...,
Negative : MySQL will not show any errors if something goes wrong, so you cannot handle the errors. Use it only if you don’t care about the query.
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Is there a way to filter network requests using Google Chrome developer tools?
... png files smaller than 100kb in network panel
see DevTools: State Of The Union 2015 by Addy Osmani
Since Chrome 42.
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剖析程序的内存布局 - C/C++ - 清泛网 - 专注C/C++及内核技术
...拟地址空间的布局就讲这些吧。下一篇文章将讨论内核是如何跟踪这些内存区域的。我们会分析内存映射，看看文件的读写操作是如何与之关联的，以及内存使用概况的含义。
布局 内存 程序
SQL SELECT WHERE field contains words
...start, stop) AS (
SELECT 1, 1, CHARINDEX(@sep, @str)
UNION ALL
SELECT pn + 1, stop + 1, CHARINDEX(@sep, @str, stop + 1)
FROM Pieces
WHERE stop > 0
)
SELECT
pn AS Id,
SUBSTRING(@str, start, CASE WHEN stop >...