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KIO4_Gradient 拓展：布局中的颜色渐变 - App Inventor 2 中文网 - 清泛IT...
http://kio4.com/appinventor/287_extension_gradiente_color.htm
- 让我们看一下在布局中制作颜色渐变的扩展。- 我们放置一个布局，然后在该扩展的块中插入该布局的名称，放置一个包含所需颜色的列表，以及一个从 1 到 8 的数字，用于表示...
Set value to NULL in MySQL
I want a value to be set to NULL if nothing is put into the text box in the form I'm submitting. How can I make this happen?
I've tried inserting 'NULL' but this just adds the word NULL into the field.
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Removing first x characters from string?
How might one remove the first x characters from a string? For example, if one had a string lipsum , how would they remove the first 3 characters and get a result of sum ?
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How to read a large file - line by line?
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The correct, fully Pythonic way to read a file is the following:
with open(...) as f:
for line in f:
# Do something with 'line'
The with statement handles opening and closing the file, including if an exception is raised in the i...
Mysql ibdata 丢失或损坏如何通过frm&ibd 恢复数据 - 更多技术 - 清泛网 - ...
...，这个方法不能恢复你的数据。my.ini的设置为 innodb_file_per_table = 1。
参考 http://blog.chinaunix.net/uid-24111901-id-2627876.html
1、找回表结构，如果表结构没有丢失直接到下一步
a、先创建一个数据库，这个数据库必须是没有表和任何...
Undo scaffolding in Rails
... already run the migrations generated by the scaffold command, you have to perform a rollback first.
rake db:rollback
You can create scaffolding using:
rails generate scaffold MyFoo
(or similar), and you can destroy/undo it using
rails destroy scaffold MyFoo
That will delete all the files...
Remove plot axis values
...f there is a way to get rid of axis values, either the x-axis or y-axis respectively, in an r-plot graph.
5 Answers
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How to copy files across computers using SSH and MAC OS X Terminal [closed]
I'm trying to copy my .profile, .rvm and .ssh folders/files to a new computer and keep getting a "not a regular file" response. I know how to use the cp and ssh commands but I'm not sure how to use them in order to transfer files from one computer to another.
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Check if all checkboxes are selected
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edited Jun 4 '15 at 21:04
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How do I remove a big file wrongly committed in git [duplicate]
I did a stupid thing. Imagine that I committed a 100MB file. Then I see this and delete this file and commit again. This is a normal procedure to delete a file.
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