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问题 I would like to get the data tags from mongodb whose data is not null "tags" : [ ] I tried doing $ne but no chance. BasicDBObject searchQuery = new BasicDBObject(); searchQuery.put("tags", new BasicDBObject("$ne", [])); Any help would be appreciated. 回答1: I solved this by using this query searchQuery.put("tags.1", new BasicDBObject("$exists", true)); 来源： https://stackoverflow.com/questions/42099824/how-to-search-the-array-with-no-empty-value-from-mongodb-in-java

问题 Please help, I'm very confused about my situation. I'm beginning to create a search function but I'm not sure the best way to go about it. On the front-end users will be able to enter words in a text-field, then these will search the MYSQL database, something like below: so they search for 'Adult' and every item_id (Primary Key) with 'Adult' in column 'name' is listed. Or they enter 'black' and every item_id with 'black' in 'colors' is listed. or they enter 'Adult Blue' and every item with

问题 I have problem with search digits in my string. I have two files. stver.php define('upd_ver', 256); tr_ver.php define('code_ver', 110); The problem is: how to find digits (256 and 110) make increment and save files. Exmpl, string define('upd_ver', 256); after saving becomes define('upd_ver', 257); #!/usr/bin/perl $sv="stver.php"; $tv="tr_ver.php"; open (SVIN, $sv) || die "Can't open $sv"; while (<SVIN>) { chomp; print;} print "\n"; close (SVIN); 回答1: One approach: s/(define\(.*?,\s*)(\d+)/"$1

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 5 years ago . How can I create a global search in my site? The site is internal and not available on the net and I can't use Google Search for this. I have information that is stored all in different MySQL tables. For example account are stored in the account table, account related addresses

问题 Elastic Search does not currently (as of 0.18.4) support field collapsing. Is there a good way to simulate this, as to avoid N search queries? 回答1: Probably not the answer you're looking for but: As far as I know, and according to this ticket, the only real workaround is to select a larger result set and group on the client side. 回答2: Depending on what your use case is you might find parent/child support or nested types useful instead. You can find more about parent/child support here: https:

问题 As a C# Novice, currently to find out the index of the first uppercase character in a string I have figured out a way var pos = spam.IndexOf(spam.ToCharArray().First(s => String.Equals(s, char.ToUpper(s)))); Functionally the code works fine except that I was having the discomfort of traversing the string twice, once to find the Character and then the Index. Is there any possibility to get the index of the first UpperCase character in one pass using LINQ? an equivalent way in C++ would be

问题 I have already implemented a location based search using geocoder and am having trouble integrating the meta_search gem. I'm trying to integrate meta_search into my object_controller index to allow users to filter and sort search results by an objects :attributes after they have already searched by location. My object_controller: def index if params[:search].present? @objects = Object.near(params[:search], 50, :order => :distance).paginate(:page => params[:page], :per_page => 9) else @objects

问题 I'm new to web design, especially backend design so I have a few questions about implementing a search function in PHP. I already set up a MySQL connection but I don't know how to access specific rows in the MySQL table. Also is the similar text function implemented correctly considering I want to return results that are nearly the same as the search term? Right now, I can only return results that are the exact same or it gives "no result." For example, if I search "tex" it would return

问题 The EXACT same thing if i do it in .html , xml files e.t.c it works as it should. That is it reutrns a filled find results tab. In this file it doesn't I have a simple .log text file When i search with ctrl+f everything is ok: when i use ctrl+shift+f i have 0 results. Why? 回答1: Scanning through the text of these log files, do you see any control characters? According to this answer to your question in the Sublime Text forum, when Sublime Text finds inline control characters, Find in Files

问题 Hi Guys, I want a similar searching functionality like Twitter,etc apps. User will enter text and as per the text entered, user should get the updated set of options to choose from. I am fetching data from external database for that. Currently I used a web-service and passed the data to be searched in it, which gives me relevant results. I am calling that web service on onTextChanged event of EditText . But this causes me to fire that web-service every time a letter has been added. Can