data-synchronization

问题 I'm facing the following challenge: I have a bunch of databases in different geographical locations where the network may fail a lot (I'm using cellular network). I need to keep all the databases synchronized but there is no need to be in real time. I'm using Java but I have the freedom to choose any free database. Any suggestions on how I can achieve this. Thanks. 回答1: I am not aware of any databases that will give you this functionality out of the box; there is a lot of complexity here due

问题 I know that UTF-16 is a self-synchronizing encoding scheme. I also read the below Wiki, but did not quite get it. Self Synchronizing Code Can you please explain me with an example of UTF-16? 回答1: In UTF-16 characters outside of the BMP are represented using a surrogate pair in with the first code unit (CU) lies between 0xD800—0xDBFF and the second one between 0xDC00—0xDFFF. Each of the CU represents 10 bits of the code point. Characters in the BMP is encoded as itself. Now the synchronization

问题 I want to synchronize data from a nosql database, have it emit json, and when there is a change and the app is online, have the app pull the changes and update them. My react-native app uses a few language-specific json files loading them dynamically into javascript objects and then using them as my "database". One file for rendering content, one for the app texts, and one for the styles. When the user changes the language a different directory is used with the same set of json filenames.

问题 I have this code which displays logos with a link to a video file. I frequently upload files and I want to keep thinks in order. At the moment it just attaches them in order of name. So for example if I upload a movie and haven't gotten around to uploading a photo with the exact same name then from that point on any photos will be displayed with mismatching links. What I'd like to do is display a temporary photo if the name doesn't match. I know you can do something like if(array[1] ===

问题 I have a very essential question about a basic concept regarding synchronization of multiple clients that share a common database: I plan to design a distributed application using Java and JPA for persistence. Assumed that I have a central database that hosts all enterprise data and multiple clients connect to this database for querying data, what would be the best approach to keep the particular clients synchronized (in means of the data in the database) ? E.g. Client A updates the surname

问题 How would you implement a data synchronization solution that ensures data on a mobile device and web server are in sync. 回答1: Take a look to this tutorial (part one and part two), basically what they do is add a timestamp attribute storing the last modifications. It is developed to synchronize with the parse.com backend service but it is extendable to any backend. 回答2: We use a Unix-Timestamp in our company for this. The Server is comunicating with us in json over tls and client is using

问题 We have a normalized SQL Server 2008 database designed using generic tables. So, instead of having a separate table for each entity (e.g. Products, Orders, OrderItems, etc), we have generic tables (Entities, Instances, Relationships, Attributes, etc). We have decided to have a separate denormalized database for quick retrieval of data. Could you please advise me of various technologies out there to synchronize these 2 databases, assuming they have different schemas? Cheers, Mosh 回答1: When two

问题 In my application I want to send data stored in the local sqlite database to server's sqlserver database. Is there any utility for android to directly send the .db file and read the content in the server. Writing multiple insert statements will make code very lengthy and will cause in the primary key violation. Please help. 回答1: When you create the database you are specifying the database name (for instance products.db ). If your application package name is com.example.yourapplicationpackage,

问题 In my application I want to send data stored in the local sqlite database to server's sqlserver database. Is there any utility for android to directly send the .db file and read the content in the server. Writing multiple insert statements will make code very lengthy and will cause in the primary key violation. Please help. 回答1: When you create the database you are specifying the database name (for instance products.db ). If your application package name is com.example.yourapplicationpackage,

问题 I'am new to the OpenCL. How can i make a delay in OpenCL Kernel script without making loops? I have a code that's in some circumstances needs to wait for some time and then resume execution like so __kernel void test(uint4 value,uint4 delay) { uint id = get_global_id(0); //some code for(uint i=0;i<delay;i++) { //... do nothing like this? } } But i suppose that the loop will make gpu busy as hell, is there something i can use like sleep maybe in the kernel CL? I looked up in the sdk