key-value

问题 I have a string like this: key=value, key2=value2 and I would like to parse it into something like this: array( \"key\" => \"value\", \"key2\" => \"value2\" ) I could do something like $parts = explode(\",\", $string) $parts = array_map(\"trim\", $parts); foreach($parts as $currentPart) { list($key, $value) = explode(\"=\", $currentPart); $keyValues[$key] = $value; } But this seems ridiciulous. There must be some way to do this smarter with PHP right? 回答1: If you don't mind using regex ...

问题 The ConfigParser module raises an exception if one parses a simple Java-style .properties file, whose content is key-value pairs (i..e without INI-style section headers). Is there some workaround? 回答1: Say you have, e.g.: $ cat my.props first: primo second: secondo third: terzo i.e. would be a .config format except that it's missing a leading section name. Then, it easy to fake the section header: import ConfigParser class FakeSecHead(object): def __init__(self, fp): self.fp = fp self.sechead

问题 Intro I have been reading about EAV database and most of the short comings seem to be related to really, really, bad EAV designs or difficulty generating reports from the data. Usually when you see people complaining about EAV they are using less than three tables to try to replicate the functionally of separate tables + columns in a RDBMS. Sometimes that means storing everything from decimals to strings in a single TEXT value column. EAV also messes with the safe-guards over data integrity

问题 This question already has answers here : list to dictionary conversion with multiple values per key? (4 answers) Closed last year . I am new to python and I have a list of years and values for each year. What I want to do is check if the year already exists in a dictionary and if it does, append the value to that list of values for the specific key. So for instance, I have a list of years and have one value for each year: 2010 2 2009 4 1989 8 2009 7 What I want to do is populate a dictionary

问题 I\'m looking for a class in java that has key-value association, but without using hashes. Here is what I\'m currently doing: Add values to a Hashtable . Get an iterator for the Hashtable.entrySet() . Iterate through all values and: Get a Map.Entry for the iterator. Create an object of type Module (a custom class) based on the value. Add the class to a JPanel. Show the panel. The problem with this is that I do not have control over the order that I get the values back, so I cannot display the

问题 I need to write some kind of loop that can count the frequency of each letter in a string. For example: \"aasjjikkk\" would count 2 \'a\', 1 \'s\', 2 \'j\', 1 \'i\', 3 \'k\'. Ultimately id like these to end up in a map with the character as the key and the count as the value. Any good idea how to do this? 回答1: You can use a java Map and map a char to an int . You can then iterate over the characters in the string and check if they have been added to the map, if they have, you can then

问题 It is safe to say that the EAV/CR database model is bad. That said, Question: What database model, technique, or pattern should be used to deal with \"classes\" of attributes describing e-commerce products which can be changed at run time? In a good E-commerce database, you will store classes of options (like TV resolution then have a resolution for each TV, but the next product may not be a TV and not have \"TV resolution\"). How do you store them, search efficiently, and allow your users to

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