key-value

问题 I am looking for a better pattern for working with a list of elements which each need processed and then depending on the outcome are removed from the list. You can't use .Remove(element) inside a foreach (var element in X) (because it results in Collection was modified; enumeration operation may not execute. exception)... you also can't use for (int i = 0; i < elements.Count(); i++) and .RemoveAt(i) because it disrupts your current position in the collection relative to i . Is there an

问题 cache.set(key, Biglist, 3600) print cache.get(key) When my "Biglist" is a huge list of lots of content, it doesn't seem to store. But when I change it to small text like "abc", it stores. What do I have to configure so that I can set my memcache to accept unlimited size of key/value? 回答1: See What is the maximum data size you can store section in the FAQ. What is the maximum data size you can store? (1 megabyte) The maximum size of a value you can store in memcached is 1 megabyte. If your

问题 I have an array of UIButtons and want to set all their titles to a specific value at once, without looping through the array. The only solution I've found is by means of Key-Value Coding, i.e. something like this: [self.board setValue:@"X" forKeyPath:@"titleLabel.text"]; However, the button's titleLabel property is readonly and cannot be changed. I also tried using the button's title property as the keypath, but it doesn't work either. I've done this before by changing the "enabled" property

问题 I have a dictionary < string,object > which has a mapping of a string and a dictionary < string,int >. How do I add a key value pair in the inside dictionary < string ,int > ? Dictionary <string,object> dict = new Dictionary <string,object>(); Dictionary <string,int> insideDict = new Dictionary <string,int>(); // ad some values in insideDict dict.Add("blah",insideDict); So now the dict has a dictionary mapped with a string.Now I want to separately add values to the insideDict. I tried dict[

问题 I want to take a dictionary with this form a={'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}} d={} p={} a={'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}} for key in a: for product in a[key]: price=a[key][product] d[key]=price p[product]=d print(p) and transform it into

问题 I have been learning Spark for several weeks, currently I am trying to group several items or people based on their connection using Spark and Hadoop in Scala. For example, I want to see how football players are connected based on their club history. My "players" rdd would be: (John, FC Sion) (Mike, FC Sion) (Bobby, PSV Eindhoven) (Hans, FC Sion) I want to have rdd like this: (John, <Mike, Hans>) (Mike, <John, Hans>) (Bobby, <>) (Hans, <Mike, John>) I plan to use map to accomplish this. val

问题 In Hbase 1.2.4 What is the difference between checkAndPut and checkAndMutate? 回答1: checkAndPut - compares the value with the current value from the hbase according to the passed CompareOp. CompareOp=EQUALS Adds the value to the put object if expected value is equal. checkAndMutate - compares the value with the current value from the hbase according to the passed CompareOp.CompareOp=EQUALS Adds the value to the rowmutation object if expected value is equal. you can add multiple put and delete

问题 I want to expire a particular key/value pair set in a hashKey in redis. But redis expires the whole hashKey with all keyValue pairs inside lost. For example i just want to remove Key:666 from seqNu. Using jedis.setex is other option but u cant set a hashKey in it. jedis.hset("seqNu","666",System.currentTimeMillis()+""); jedis.hset("seqNu","777",System.currentTimeMillis()+""); jedis.expire("seqNu", 20); // This expires the whole HashKey: seqNu after 20 seconds 回答1: Redis only expires "whole"

问题 Is it possible to have an Associate Array / Key Pair Array arranged in with random order of keys. Whenever, I am adding a new element, javascript is automatically sorting the keys. For example, When I'm creating an array as a[T1001] ="B" a[T1005] = "A" a[T1003] ="C" and later the array list is verified, I'm seeing that the array is automatically ordered as : a[T1001] a[T1003] a[T1005] Is it possible to retain the same order in which I am assigning the values to the array ?. I cannot use the

问题 I'm trying to do something that seems relatively straightforward but am running into some difficulty. I have a bunch of text, and each line is a value. I analyze each line of text, create the appropriate key, then emit KV pairs. I then use the GroupByKey transform. Finally, I want to output all the text now grouped by key (bonus points if I can get one text file for each key, but I'm not sure that's possible). Here's what the pipeline's apply looks like: public PCollection<String> apply