updates

问题 I want to execute a complex upsert, made by the following elements: query on a field f by regex update of the same field f (that is specified in the query object too) Like this: db.coll.update({ prop: /valueprop/i } , { $addToSet:{ prop:'a value' } } , true, false) My expectation would be that if the document does not exist in the collection it is inserted with prop field equals to 'a value'; in other words it should insert a document with value of prop field that is the one specified in the

问题 A few weeks ago I started working with Postgres and I've been trying to solve this problem for the last few days with mixed results: I have a table (10 million rows) that needs to be updated once every month with information stored in a few other tables. During this update no-one has access to the database, so no-one is reading / writing data. I will be the only DB user during that time. Table A has 10 million rows. One column (rebuilding costs) needs to be updated. Table B, table C and table

问题 I have a string that carry the path of a nested json, where I need to update a value var path = 'p_Data[0]["BusinessUnit"][0]["BusinessUnit"]' if i evaluate this path I get value as 'Unit1'. I need to update the value 'Unit1' with 'Closed' and retrieve the original data ie, p_Data I tried eval(path = 'Closed') , but didn't work. How to do this? 回答1: eval(path + "='Closed'"); But have a look at this thread: Why is using the JavaScript eval function a bad idea?. 来源： https://stackoverflow.com

问题 I have a shopping app on playstore. There are many new updates which the user must have. The new Apk needs to be update by all users. How can I force all my users to update their app? 回答1: Hmm you can do this by below approach. Add an updated code version of your app to the server Make a web service that return that version code you placed on server If you have BaseActivity do the third on that else do the third step on that activity that is first Activity or launcher Activity In onResume

问题 I have 3 tables: customer(idCustomer,...) is_managed(idCustomer,idPerson) sales_person(idPerson,...) There is a @ManyToMany relation between customer and sales_person . When I perform a delete, then it works fine: the customer , is_managed and sales_person are deleted. But when I perform an update, then the customer and is_managed are updated, but the sales_person not. For example, if I update a customer by deleting the sales_person , it's deleted in is_managed table, but not in sales_person

问题 $db->akis->update( array("h" => (string) $_SESSION["_id"], "m" => array('$exists' => false)), array('$set' => array("k" => $name)), array("multiple" => true) ); what i did in here is, if there is an m field, do not update k. What I want to add is, "if m field exists" update i instead of k field, how can I manage this ? thank you 回答1: I think you will need to do two separate queries here. That is just too conditional for MongoDB query parser to handle. So you will need to put your logic into

问题 If I would be lucky enough to have my app preloaded into certain Android devices, can I serve both preloaded customers & new ones from the same app instance in any given Android store? The app would be free for existing users and paid for new customers. Related question would be about different Stores. Can I update my preloaded app using any Store available or do I have to stick to Google Play? 回答1: It's not directly possible because the Google Play store doesn't let you change an app from

问题 I am using Google API in my app. Everything works perfectly. I just want to know how to update directions while moving. For now I have button "Actualize direction", but I want to do it dynamically. For example I want to update it (maybe offline if it is possible?) after changing my actual location. I think that this app will be used by drivers so it would be good to have dynamical updating of those directions. Is it possible to do something like this? Thx for help 回答1: Implementing such kind

问题 Say you have an app that uses an external system, like azure, and a major update makes breaking changes to the external system. The old version of the app would fail, so... Can you force the app to update? If so, any help/links/tutorials would be helpful. 回答1: It is possible to programatically check from you app, if there is an update. See https://social.technet.microsoft.com/wiki/contents/articles/21672.now-check-for-updates-of-your-app-inside-your-windows-phone-application.aspx. If there is

问题 I have a vector which contains objects. The objects have a property called first name. I want to update the first name in a property, in order to do that i have to pass the vector which the objects are saved, staff number which uniquely identifies each object and finally the new name taken from the user input. My problem is it displays the update name in the loop which i use to set the new name but if i use a second loop or a new loop and iterate through the vector again, the new name isn't