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Flask-SQLAlchemy how to delete all rows in a single table
...elete()
From the docs: Returns the number of rows deleted, excluding any cascades.
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What is string_view?
... The string_view in question is one such proposal; there were earlier ones called string_ref and array_ref, too.
The idea is always to store a pair of pointer-to-first-element and size of some existing data array or string.
Such a view-handle class could be passed around cheaply by value and would...
网站伪静态Rewrite重写中文路径时乱码 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...utf-8编码。这就是我们的结论4。
六、Javascript函数：escape()。
好了，到此为止，四种情况都说完了。
假定前面你都看懂了，那么此时你应该会感到很头痛。因为，实在太混乱了。不同的操作系统、不同的浏览器、不同的网...
What is the Objective-C equivalent for “toString()”, for use with NSLog?
Is there a method that I can override in my custom classes so that when
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UILabel - Wordwrap text
...to add line breaks to make it wrap properly? I just want it to wrap if it can't fit it in horizontally.
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jQuery: checking if the value of a field is null (empty)
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The value of a field can not be null, it's always a string value.
The code will check if the string value is the string "NULL". You want to check if it's an empty string instead:
if ($('#person_data[document_type]').val() != ''){}
or:
if ($(...
grepping using the “|” alternative operator
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You need to escape the |. The following should do the job.
grep "gene\|exon" AT5G60410.gff
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Use of ~ (tilde) in R programming Language
...e right of <- is a formula object. It is often used to denote a statistical model, where the thing on the left of the ~ is the response and the things on the right of the ~ are the explanatory variables. So in English you'd say something like "Species depends on Sepal Length, Sepal Width, Petal L...
What is a provisioning profile used for when developing iPhone applications?
...a provisioning profile and why is it needed when developing an iPhone application? If I don't have a provisioning profile, what happens?
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SQL Add foreign key to existing column
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Error indicates that there is no UserID column in your Employees table. Try adding the column first and then re-run the statement.
ALTER TABLE Employees
ADD CONSTRAINT FK_ActiveDirectories_UserID FOREIGN KEY (UserID)
REFERENCES Ac...