keyword

问题 For some reason, the developers at a new company I'm working for decided to name their columns "ignore" and "exists". Now when I run MySQL queries with those words in the where clause, I get a syntax error; however, I can't seem to figure out how to reference those columns without running into an error. I tried setting them as strings, but that doesn't make any sense. Help? Also, is there a term for this kind of mismatch? 回答1: put the names in backticks: `ignore`, `exists` If you're working

问题 This question already has answers here : With block equivalent in C#? (15 answers) Closed 6 years ago . I was looking at the online help for the Infragistics control library today and saw some VB code that used the With keyword to set multiple properties on a tab control. It's been nearly 10 years since I've done any VB programming, and I had all but forgotten that this keyword even existed. Since I'm still relatively new to C#, I quickly went to see if it had a similar construct. Sadly, I

问题 Use Case When a user goes to my website, they will be confronted with a search box much like SO. They can search for results using plan text. ".net questions", "closed questions", ".net and java", etc.. The search will function a bit different that SO, in that it will try to as much as possible of the schema of the database rather than a straight fulltext search. So ".net questions" will only search for .net questions as opposed to .net answers (probably not applicable to SO case, just an

问题 This code does not compile for me on gcc version 4.3.2 (Debian 4.3.2-1.1) main(){ int unix; } I've checked the C keywords list and "unix" is not one of them. Why am I getting the following error? unix.c:2: error: expected identifier or ‘(’ before numeric constant Anybody? 回答1: unix is not a identifier reserved by the Standard. If you compile with -std=c89 or -std=c99 the gcc compiler will accept the program as you expected. From gcc manual ( https://gcc.gnu.org/onlinedocs/cpp/System-specific

问题 (inspired by this comment) Is there ever a situation in which you need to use the private keyword? (In other words, a situation in which omitting the keyword would result in different behavior) 回答1: public class Foo { public int Bar { get; private set; } } Omitting the word 'private' would change the accessibility. 回答2: a situation in which omitting the keyword [ private ] would result in different behavior David Yaw's answer gave the most usual situation. Here is another one: In Account

问题 For instance, I know that it is possible to do something in Javascript that allows users to update text based on user text input: <script type="text/javascript"> function changeText2(){ var userInput = document.getElementById('userInput').value; document.getElementById('boldStuff2').innerHTML = userInput; } </script> <p>Welcome to the site <b id='boldStuff2'>dude</b> </p> <input type='text' id='userInput' value='Enter Text Here' /> <input type='button' onclick='changeText2()' value='Change

问题 This question already has answers here : Closed 10 years ago . Duplicate : What does the 'static' keyword do in a class? I've read this post already. What does the "static" keyword in a method do? I remember being told that static != clingy...but that is pretty much all I know about this keyword. 回答1: Static class variables can be thought of as a global class. No matter how many instances of the class you have, there is just one instance of each static variable. Static methods don't use any

问题 We can do: NaN = 'foo' as well as undefined = 'foo' Why they are not reserved keywords? Edit 1 (DownVoters): I think it should be implemented in order to be sure that when we are looking for a number , it is a number :) If we should use IsNaN() or typeof so why NaN or undefined are needed? 回答1: https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/NaN NaN is a property of the global object. The initial value of NaN is Not-A-Number — the same as the value of Number.NaN. In

问题 Hope this question wasn't asked before. Does anyone know the character limit for domain names? For example if I write this: CREATE DOMAIN d_complement_activite_etablissement AS character varying it will create a domain with the name: d_complement_activite_etabliss (Yeah, I know how to count, but I want some more info on the subject). Is there a command that can change this maximum length? Is this length the same for other names (columns, tables etc)? 回答1: You ask: Is there a command that can

问题 I am working on a project where I have to find out the keyword density of thepage on the basis of URL of that page. I googled a lot but no help and scripts were found, I found a paid tool http://www.selfseo.com/store/_catalog/php_scripts/_keyword_density_checker_php_script But I am not aware actually what "keyword Density of a page" actually means? and also please tell me how can we create a PHP script which will fetch the keyword density of a web page. Thanks 回答1: "Keyword density" is simply