data-storage

问题 We are facing the following dilemma: Our mobile client application will be user-authenticating through a BaaS (Backend-as-a-Service) and will then need to send a file to the cloud - specifically an Amazon EC2 server where the main processing will take place. Since the time of processing of the file might take place later, there is a need to store the files (and there is also a prospect of keeping an archive of them for future use by the users). The question is what would you suggest as the

问题 I am a newbie in Android and I'm just trying to permanently store a string. I want to get this string from a PreferenceActivity and then update the text of a TextView . I was reading about the available options for persistent storage: http://developer.android.com/guide/topics/data/data-storage.html#pref I've tried to use SharedPreferences but it's very unclear for me on how it should work. I have created a very simple test app. MainActivity.java public class MainActivity extends Activity { /*

问题 I have an idea for how to solve this problem, but I wanted to know if there's something easier and more extensible to my problem. The program I'm working on has two basic forms of data: images, and the information associated with those images. The information associated with the images has been previously stored in a JET database of extreme simplicity (four tables) which turned out to be both slow and incomplete in the stored fields. We're moving to a new implementation of data storage. Given

问题 I have created an sql database using Java, I am a noob when it comes to sql but have it configured and set up, i have a table created which has two columns, the first being a big integer which increments, the second I have tried defining it as a char, varchar and binary but im still not getting the desired function, say i try and store 0a a hex number into the char column i get an error, i appended 0x to the beginning a it seems to store, but when i print out the contents it is blank or in

问题 i have developed an app that can download mp3 files (nearly 6 to 8 mb of size) from online and stored in NSDocumentDirectory. my app get rejected today and says that "Apps must follow the iOS Data Storage Guidelines or they will be rejected" We found that your app does not follow the iOS Data Storage Guidelines, which is required per the App Store Review Guidelines. The iOS Data Storage Guidelines indicate that only content that the user creates using your app, e.g., documents, new files,

问题 I'm writing an application that communicates with a web API, which responds with JSON. Currently, I'm translating the JSON objects to Java objects using gson (which is awesome, by the way). Now, I want to store some of these objects in an SQLite database. However, they have lots of properties that would never be used in queries (i.e. I won't be ORDER ing, WHERE ing, or anything like that with those properties), so I feel it's unnecessary to create columns for all of them. What I'm thinking of

问题 This question already has answers here : Binary Data in MySQL [closed] (9 answers) Closed 6 years ago . How do I store binary data in a MySQL database? 回答1: This question is not so straight forward to answer, as it sounds: There are lots of different binary data usage patterns out there, each with their own caveats and pros and cons. Let me try to summarize: Short pieces of binary data, such as password hashes, work very well by simply base64-encoding them and storing the resulting string as

问题 Can any one tell me where jquery data() stores the data and when it is get erased and how? Is there any performance issue if I use this to store ajax call result? For example: $("body").data("test", { myData: 'abcd'}); 回答1: see the content from jquery The jQuery.data() method allows us to attach data of any type to DOM elements in a way that is safe from circular references and therefore free from memory leaks. jQuery ensures that the data is removed when DOM elements are removed via jQuery

问题 What is the easiest way to handle huge numbers in C? I need to store values in the Area 1000^900... Does anybody know of an easy way to do that? Any help would really be appreciated! 回答1: Use libgmp: GMP is a free library for arbitrary precision arithmetic, operating on signed integers, rational numbers, and floating-point numbers. There is no practical limit to the precision except the ones implied by the available memory in the machine GMP runs on... Since version 6, GMP is distributed

问题 What is the easiest way to handle huge numbers in C? I need to store values in the Area 1000^900... Does anybody know of an easy way to do that? Any help would really be appreciated! 回答1: Use libgmp: GMP is a free library for arbitrary precision arithmetic, operating on signed integers, rational numbers, and floating-point numbers. There is no practical limit to the precision except the ones implied by the available memory in the machine GMP runs on... Since version 6, GMP is distributed