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多媒体组件 · App Inventor 2 中文网
...帧。
开始()
播放 源文件 指定的媒体。
停止()
重置为视频开始位置，如果视频正在播放则暂停。
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clang error: unknown argument: '-mno-fused-madd' (python package installation failure)
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If you install as root you need to set the flags for the root user.
– ErikAndren
Mar 18 '14 at 6:29
48
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How to remove leading and trailing whitespace in a MySQL field?
...really curious as to why this answer's got so many upvotes. Are you using mysql? What version?
– billynoah
May 16 '16 at 4:30
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iOS开发调试技巧总结 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...复杂。这样就给我们新接手项目的开发者带来很多困扰。如何快速查看一个复杂UI的界面层次和布局，最快的方法就是用到视图调试。
当项目运行到某一个界面（可以是模拟器或真机）时，开启视图调试，点击按钮如图：
这样...
Detect if value is number in MySQL
Is there a way to detect if a value is a number in a MySQL query? Such as
15 Answers
1...
Why is a “GRANT USAGE” created the first time I grant a user privileges?
...to the admin side of DBMS and was setting up a new database tonight (using MySQL) when I noticed this. After granting a user a privilege for the first time, another grant is created that looks like
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mysql实现split分割字符串（length, SUBSTRING_INDEX, substring） - 爬虫/...
由于MySql没有直接的split函数，只提供了length, SUBSTRING_INDEX, substring三个函数，这里介绍如何用这三个函数实现split功能。
# SUBSTRING_INDEX(str, delim, count)：返回字符串 str 中在第 count 个出现的分隔符 delim 之前的子串。如果 count 是...
How to log PostgreSQL queries?
... that mean PostgreSQL can't enable logging unless I restart the server? In MySQL, it is as simple as "SET GLOBAL general_log = 'ON';"
– Antony
Dec 7 '11 at 22:41
7
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Where is the Java SDK folder in my computer? Ubuntu 12.04
...in /usr/bin/java.
Dig again:
Step 2:
$ ls -l /usr/bin/java
lrwxrwxrwx 1 root root 22 2009-01-15 18:34 /usr/bin/java -> /etc/alternatives/java
So, now we know that /usr/bin/java is actually a symbolic link to /etc/alternatives/java.
Dig deeper using the same method above:
Step 3:
$ ls -l /...
What is the difference between 127.0.0.1 and localhost
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@DonViegues That's MySQL specific and IMO bad design. It will see localhost and tries to use unix-socket instead of connecting using IP but for 127.0.0.1 it just uses IP.
– Arman Ordookhani
Jul 18 '19 at 8...