exists

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How to check if a chrome:// file exists via javascript, without actually loading the file?

I\'m using the following function in a Firefox extension to check if a file exists in another extension:[详细]

2023-03-03 21:51 分类：问答
Validating the existence of a remote directory in C#

I am using Directory.Exists to see if an entered directory is a valid directory. This works well for all local directories, and for valid remote directories that I have access to, but for remote direc[详细]

2023-02-28 16:52 分类：问答
Ensure URL points to a real location?

I\'ve got this little CMS thing going, and the user has the ability to preview the post before submitting. I\'d like to have a feature that checks whether a URL entered is valid (I.E. points to a reso[详细]

2023-02-28 03:29 分类：问答
Mongo: find items that don't have a certain field

H开发者_JS百科ow to search for documents in a collection that are missing a certain field in MongoDB?Yeah, it\'s possible using $exists:[详细]

2023-02-27 06:21 分类：问答
Test if a variable exists

I want to test if a variable exists and if it doesn\'t, create i开发者_C百科t.The open()&varnum() functions can be used. Non-zero output from varnum() indicates the variable exists.[详细]

2023-02-25 15:01 分类：问答
insert and update if a record exists else not , race condition

if exists (select itemcode from item where itemcode=1120) update item set itemname = \'laptop\' where开发者_开发技巧 itemcode = 1120[详细]

2023-02-24 09:25 分类：问答
How can I check if an element exists in the visible DOM?

How do you test an element for existence without the use of the getElementById method? I have set up a live demo for reference. I will also print the code on here as well:[详细]

2023-02-24 03:42 分类：问答
LINQ Where Exists GROUP BY

How can i convert this in LINQ? SELECT B.SENDER, B.SENDNUMBER, B.SMSTIME, B.SMSTEXT FROM MESSAGES B WHERE EXISTS ( SELECT A.SENDER[详细]

2023-02-21 23:13 分类：问答
How can I chain together SELECT EXISTS() queries?

I have this simple query SELECT EXISTS(SELECT a FROM A WHERE a = \'lorem ipsum\'); That will return a 0 or 1 if there exists a row in A that contains \'lorem ipsum\'[详细]

2023-02-20 13:22 分类：问答
How to Remove line if word exists? (PHP)

Hey, I want to remove the whole line if a word exists in it?开发者_StackOverflow中文版 through PHP?[详细]

2023-02-18 13:47 分类：问答