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Show only VIEWS in SQLite

由 自闭症网瘾萝莉.ら 提交于 2019-12-04 03:37:19
问题 How can i see only VIEWS in SQLite. .tables command list both views as well as tables. I want to see only VIEWS and not tables. Thanks. 回答1: You can do: SELECT sql FROM sqlite_master WHERE type = 'view'; In order to fine-tune it: .headers on select * from sqlite_master; you will know what columns are available there. 来源： https://stackoverflow.com/questions/9479540/show-only-views-in-sqlite

Matplotlib does not update plot when used in an IDE (PyCharm)

由 筅森魡賤 提交于 2019-12-03 21:30:55
问题 I am new to python and just installed pyCharm and tried to run a test example given to the following question: How to update a plot in matplotlib? This example updates the plot to animate a moving sine signal. Instead of replotting, it updates the data of the plot object. It works in command line but the figure does not show up when run in PyCharm. Adding plt.show(block=True) at the end of the script brings up the figure but this time it wont update. Any ideas? 回答1: The updating in the linked

Haskell: Deriving Show for custom type

由 那年仲夏 提交于 2019-12-03 14:33:39
问题 I have this type definition: data Operace = Op (Int->Int->Int) String (Int->Int->Int) deriving Show I want to print this type into the interactive shell (GHCi). All that should be printed is the String field. I tried this: instance Show Operace where show (Op op str inv) = show str But I still keep getting No instance for (Show (Int -> Int -> Int)) arising from the 'deriving' clause of a data type declaration Possible fix: add an instance declaration for (Show (Int -> Int -> Int)) or use a

jQuery Show a Textbox When an Option is Selected

由 限于喜欢 提交于 2019-12-03 14:25:11
I have the following code: <select> <option value="Type 1">Type 1</option> <option value="Type 2">Type 2</option> <option value="Type 3">Type 3</option> <option value="Other">Other</option> </select> <input type="text" id="other" /> What I want to do is using jQuery make the textbox below hidden by default, and then show it if a user selects the other option from the dropdown. No need for any css here. $('#sel').change(function() { var selected = $(this).val(); if(selected == 'Other'){ $('#other').show(); } else{ $('#other').hide(); } }); <select id="sel"> <option value="Type 1">Type 1</option

How to show/hide input value on focus?

由 血红的双手。 提交于 2019-12-03 13:40:59
问题 I see this all over the web, but was wondering if anyone has the JavaScript code for the EASIEST way to show input value on blur, but hide in on focus. 回答1: This always worked for me: <input type="text" value="Name:" name="visitors_name" onblur="if(value=='') value = 'Name:'" onfocus="if(value=='Name:') value = ''" /> 回答2: Since this still comes up on google, I'd like to point out that with HTML 5 you can use the placeholder attribute with an input to achieve this in one piece of html. <input

Nicely printing/showing a binary tree in Haskell

由 限于喜欢 提交于 2019-12-03 11:31:17
问题 I have a tree data type: data Tree a b = Branch b (Tree a b) (Tree a b) | Leaf a ...and I need to make it an instance of Show , without using deriving . I have found that nicely displaying a little branch with two leaves is easy: instance (Show a, Show b) => Show (Tree a b) where show (Leaf x) = show x show (Branch val l r) = " " ++ show val ++ "\n" ++ show l ++ " " ++ show r But how can I extend a nice structure to a tree of arbitrary size? It seems like determining the spacing would require

how to show up the google voice recognition settings in my app?

由 情到浓时终转凉″ 提交于 2019-12-03 10:14:54
问题 I am working on an android application in which i have implemented voice recognition and TTS. So i was thinking to launch settings screen for both google voice recognition and TTS to allow user to change settings from within the application. I have implemented TTS settings successfully by using following code: intent = new Intent(); intent.setAction("com.android.settings.TTS_SETTINGS"); intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); this.startActivity(intent); Now I want to show system's

Haskell: Deriving Show for custom type

由 对着背影说爱祢 提交于 2019-12-03 09:28:42
I have this type definition: data Operace = Op (Int->Int->Int) String (Int->Int->Int) deriving Show I want to print this type into the interactive shell (GHCi). All that should be printed is the String field. I tried this: instance Show Operace where show (Op op str inv) = show str But I still keep getting No instance for (Show (Int -> Int -> Int)) arising from the 'deriving' clause of a data type declaration Possible fix: add an instance declaration for (Show (Int -> Int -> Int)) or use a standalone 'deriving instance' declaration, so you can specify the instance context yourself When

jQuery: move window viewport to show freshly toggled element

由 回眸只為那壹抹淺笑 提交于 2019-12-03 07:20:42
问题 I have a snippet of jQuery in doc ready which toggles a div containing a textarea : $('div#addnote-area').hide(); // hide the div $('a#addnote-link').click(function() { // click event listener on link $('div#addnote-area').toggle(); // toggle the hidden div }); The toggle works fine when clicking the link. The problem I'm having is that if div#addnote-area is below the browser's current viewport, it remains there when it's shown. I'd like the user's cursor to go to the textarea and for the

JQuery Difference between hide() and fadeOut() , show() and fadeIn()

由 …衆ロ難τιáo~ 提交于 2019-12-03 06:43:04
I am new to jQuery. Currently, I am working with jQuery in my one of Cross Platform Mobile Applications. I need to hide and show some of my Page Contents on respective conditions. I have found following two methods that are working fine for me. $( "#myControlId" ).fadeOut(); $( "#myControlId" ).hide(); both lines are working fine for me to hide my views, also when I need to show my views following both lines are working well for me $( "#myControlId" ).fadeIn(); $( "#myControlId" ).show(); Just want to know technical Difference between them that when I need to use which function for specific
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