key-value

问题 I want to create a key-value pairs in an array within a foreach. Here is what I have so far: function createOfferUrlArray($Offer) { $offerArray = array(); foreach ($Offer as $key => $value) { $keyval = array($key => $value[4] ); array_push($offerArray,$keyval); } return $offerArray; } If I declare the array within the foreach, it will overwrites it on each iteration, but defining it outside the foreach doesn't work either and causes triplets: array[0] => key => value array[1] => key => value

问题 When would one choose a key-value data store over a relational DB? What considerations go into deciding one or the other? When is mix of both the best route? Please provide examples if you can. 回答1: In my experience, if you're even asking the question whether to use traditional vs esoteric practices, then go traditional. While esoteric practices are sexy, challenging, and fun, 99.999% of applications call for a traditional approach. With regards to relational vs KV, the question you should be

问题 I am using a properties file to store my application's configuration values. In one of the instances, I have to store a value as xxx:yyy:zzz . When I do that, the colon is escaped with a back slash \ resulting in the value showing as xxx\:yyy\:zzz in the properties file. I am aware that the colon : is a standard delimiter of the Properties Java class. However I still need to save the value without the back slash \ . Any suggestions on how to handle this? 回答1: Put the properties into the

问题 I am using a properties file to store my application's configuration values. In one of the instances, I have to store a value as xxx:yyy:zzz . When I do that, the colon is escaped with a back slash \ resulting in the value showing as xxx\:yyy\:zzz in the properties file. I am aware that the colon : is a standard delimiter of the Properties Java class. However I still need to save the value without the back slash \ . Any suggestions on how to handle this? 回答1: Put the properties into the

问题 I have several strings stored under specific reference: mReference.child(rID).child(userID2) which I want to retrieve using childEventListener as I am doing some task also when these string gets removed and that is only possible with onChildRemoved of ChildEventListener . Here's what I have tried: mReference.child(rID).child(userID2).addChildEventListener(new ChildEventListener() { @Override public void onChildAdded(DataSnapshot dataSnapshot, String s) { Log.d("dataHEre", dataSnapshot

问题 I am new to Javascript and I would like to use the document.getElementById to show the value of items, in my example I would like to list the names printed in the var= btsFrontEnd ,but I am doing something wrong. Any help will be much appreciated. Thank you. Link to my Fiddle var btsFrontEnd = { "employee-1": { "name": "Name One", "phone": "1234567890", "email": "blah@blah.com" }, "employee-2": { "name": "Name Two", "phone": "1234567890", "email": "blah@blah." } }; var btsemployees = {

问题 I am trying to read form a very big databse which consists of geo-referenced time series data. SO I have the file in the following format: latitude,longitude,value@time1,value@time2,....value@timeN. So this is the data for the entire earth. Now for my work I need to get the latitude,longitude as the key and the time series values as the value. As far as I know hadoop has KeyValueInputFormat but it considers first tab as the delimiter. Is there a way to customize it. Really need a solution for

问题 Here is my precode... $keys = array('a', 'b', 'c', 'd'); $number = 10; And here is my code... eval('$array[\''.implode('\'][\'',$keys).'\'] = $number;'); Using this, I get the following result... Array ( [a] => Array ( [b] => Array ( [c] => Array ( [d] => 10 ) ) ) ) Now, the problem is that this is the exact result I want, but I don't want to use eval() . As input to my code, I have a list of keys and a number . The number should be set to the value of the keys array being used to generate

问题 I open a file that contains this: TransactionNo Date CustomerId PurchasePairs ------------- ---- ---------- ------------- 1 09-04-2014 barakobama potatoes:2.67,sugar:1.98,cereal:5.99,crisps:1.09 2 11-04-2014 barakobama parsley:0.76,cereal:3.22 3 11-04-2014 vladimirputin bread:0.66,milk:2.87,parsley:1.33 and I want a dictionary like: {'vladimirputin': {'milk': 2.87, 'parsley': 1.33, 'bread': 0.66}, 'barakobama': {'parsley': 0.76, 'sugar': 1.98, 'crisps': 1.09, 'potatoes': 2.67, 'cereal': 9.21}

问题 Say there is a string in the loose "format", string str = "V1,B=V1,C=V1,V2,V3,D=V1,V2,A=V1,=V2,V3"; and a known set of Keys List<string> lst = new List<string>() { "A", "B", "C", "D" }; How can the Key-Value pairs shown below be extracted? (Any text before the first Key should be treated as the Value for the null Key. Also the Values shown below have any trailing comma removed.) Key Value (null) V1 A V1,=V2,V3 (The = here is, unfortunately, part of the value) B V1 C V1,V2,V3 D V1,V2 This