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php - What are the differences between backtick and single quote? Can I use IF statement in a query as above?

In the codeigniter manual writes the following. $this->db->select() accepts an optional second parameter. If you set it ... `value`) as `value` See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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uiimage - Uploading Image via POST in Objective C

I'm currently working on uploading an image to a server via HTTP Post and can't seem to figure out a way to ... network"); } return false; } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - OpenCV unable to set up SVM Parameters

I have just started my learning on SVM using C++ OpenCV and was referring to the SVM documentation here. I ... are working well except this. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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php - org.json.JSONException: Value <br of type java.lang.String cannot be converted to JSONObject

I m trying to do a registration page from an android activity connectiong the datas to my sqldatabase, I m getting this ... " => $msg))); ?> See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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iphone - How to reverse an audio file?

I'd like to reverse an existing audio file (e.g. WAV, CAF, ...) on iOS. Any suggestions on how to achieve this? Open-source libraries? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - MySQL concatenation operator

I don't know concatenation operator for MySQL. I have tried this code for concatenation: SELECT vend_name || ' ... I use to concatenate strings? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Difference in minutes from two time fields in MySQL

I set up my MySQL database with the field 'time' It is not HH:MM in the traditional sense, it is the ... Is this possible? Thanks in advance. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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html - How remove border around image in css?

I try to display a span when the cursor of the mouse is on a help icon. It works, but nevertheless, I don't ... ; width:150px; padding:4px; } cd See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mysql - Remove duplicate rows leaving oldest row Only?

I have a table of data and there are many duplicate entries from user submissions. I want to delete all duplicates ... unique IDs for each row. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - what is none scope bean and when to use it?

could some explain what a none scope is and purpose of it? Suppose if i have a bean in request scope as r1 ... such bean our self? many thanks See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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vscode settings - Is there a way to flatten or merge single-folder folders in vs code explorer?

I don't know if there's a name for this kind of behavior. I've seen it in IntelliJ, where single- ... explorer to show subfolders this way? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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uiviewcontroller - iOS 9 Segue Causes App To Freeze (no crash or error thrown)

I have been working on this app for months now and from as far back as I can remember I have never had an ... completely re add new text views. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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jsf - Change the default message "Validation Error: Value is required" to just "Value is required"

Can I modify this default required="true" validation message to show only "Value is required"? formId:inputId: ... Error: Value is required. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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php - Mysql No connection could be made because the target machine actively refused it

I know there are many people already asked this , but this people mostly forgot password of blocked by ... $user,$password,$db_name,3306); See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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What are possible suffixes after variable name in VBA?

As I've already figured out, there is at least six of them: !@#$%&. Here is snip: Dim A!, B@, C#, D$, ... are there? Is there one for Date? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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TensorFlow: slow performance when getting gradients at inputs

I'm building a simple multilayer perceptron with TensorFlow, and I also need to obtain the gradients (or error signal) ... w.r.t. the inputs? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - Appending form input value to action url as path

I have a form like this: <form action="http://localhost/test"> <input type="text" name="keywords"> <input ... like: http://localhost/test/hello See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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.net - Why is modulus operator not working for double in c#?

Consider this: double x,y; x =120.0; y = 0.05; double z= x % y; I tried this and expected the ... most appropriate way to find remainder in C#? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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find elements that are stacked under (visually) an element in jquery

if i have 2 divs (z index is not assigned), one layered over the over, can i use the reference to the ... box1 is beneath box2, using jquery. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Capture Output of Spawned Process to string

Background: I'm working on a program that needs to be able to capture the stdout, stderr and return values of ... available to me at that time. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - full-screen browser window on load document

How can I full-screen browser window after loading the page? I have used code like below in jQuery but its ... (); } } }); See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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lubridate - Check if a date is within an interval in R

I have these three intervals defined: YEAR_1 <- interval(ymd('2002-09-01'), ymd('2003-08-31')) YEAR_2 <- interval ... "POSIXt"), tzone = "UTC") See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python 3 print generator

There is a problem when i deal with print() function(Python 3). When I'm looking for sum of a series I ... print out each value line by line. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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r - Using different scales as fill based on factor

cnt = 100 df <- data.frame(x = c(rnorm(cnt, mean = 3), rnorm(cnt, mean = 0)), y = rnorm(2 * cnt) ... blue fill. Is this possible and if so, how? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Adding char and int

To my understanding a char is a single character, that is a letter, a digit, a punctuation mark, a tab, a space ... I end up with the output 50? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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r - calculating mean for every n values from a vector

So lets say I have a vector a <- rnorm(6000) I want to calculate the mean of the 1st value to the 60th, ... there is a better way to do this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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regex - Does MySQL Regexp support Unicode matching

Does anyone know if Mysql's regexp supports unicode? I've been doing some research and the majority of blogs etc. ... if my text is unicode. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Change values in dict of nested dicts using items in a list?

How would you modify/create keys/values in a dict of nested dicts based on the values of a list, in ... dictionaries, they should be created. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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