nosql

问题 Are there any PHP ORM projects which supports MySQL and NoSQL databases such as MongoDB? I am currently using RedBean to do MySQL ORM, however I woud like to introduce MongoDB to the applicatoin and perhaps even replace some of the MySQL with MongoDB in the future. An ORM that can allow me to easily transition between both would be nice. However, I tend to not like ORM that requires too much configuration (i.e. YAML, XML etc). RedBean is very nice in that it allows one to easily get things

问题 I implementing a Comments section for my current application. The Comments section can be thought of as a series of user posts on a given page. I am wondering which design would be most effective in a non-relational database (Google App Engine). Design 1: Group the comments by a groupId and filter on those results Comment Entity >> [id, groupId, otherData...] Queries for all comments pertaining to a page would look like: Select from Comments filter by groupId Design 2: Store a single key for

问题 Forgive my ignorance on this question, as I don't have much experience in this area. I have a page that uses a mysql COUNT(*) query to return a user's stats. For example, something like: SELECT COUNT(*) FROM worker WHERE worker_id = '1234'; It uses the index for worker_id and checking out the EXPLAIN seems that the query looks good. However, this performs absolutely brutally, and can take 5+ seconds for a single query on a table with a million+ rows. Additionally, this is quite a common query

问题 Supposedly I have a database structure like this Person ('name', 'age') Belonging ('person', 'type') with its relationship like this Person -> Belongings (one to many) and I want to query all person with their number of belongings included like this Array[0] -> name, age, numberOfBelongings, Array[1] -> name, age, numberOfBelongings, etc How do I do this? I tried to use CloudCode but, it turned out the fetching method is asynchronous, so I can't fetch the number of belongings to each person.

问题 For the following JSON how do I remove the dog whose height is the least { _id:0 "name":"Andy", "pets":[ { "type":"dog","name":"max","height":120 }, { "type":"dog","name":"rover","height":44 }, { "type":"dog","name":"katie","height":100 }, { "type":"cat","name":"minni" } ] } 回答1: The problem is the array of subdocuments is not a collection, you can't sort or do something else on it. But if you have an access to any language interface like JavaScript or else it's possible. You just need to

问题 I need some help in update using couchbase. I have a task in my page. If the user clicks the like then the likes count should be updated in my couchbase bucket. I have tried my own update handler code but that has some time latency. I have included my update code too below. This is my code for liking a task... public ResponseVO LikeTask(LikeVO likeVO) { ResponseVO response = new ResponseVO(); try { if (!isLiked(likeVO.TaskID, likeVO.UserID)) { UpdateTaskDB likeUpdate = new UpdateTaskDB();

问题 I don't know why doesn't run this project. @Data @DynamoDBTable(tableName = "tableName") public class entityName implements Serializable { private static final long serialVersionUID = 1L; @Id @DynamoDBHashKey @DynamoDBAutoGeneratedKey private String id; @DynamoDBRangeKey private String rk; private String sy; } Caused by: java.lang.IllegalArgumentException: No method or field annotated by @DynamoDBHashKey within type java.lang.String! at org.socialsignin.spring.data.dynamodb.repository.support

问题 I am trying to create a simple application for myself that uses DynamoDB. I never used NoSQL on an advanced level, only to store a value here and there. The application is a logger. I will log something and Dynamo will log the date and count for the day. For example a user logs multiple things today it will just say todays date and logged_times: 5 I can then have a query to grab a total sum of all the logged_times within the past week / day / month etc. My question is how do you structure a

问题 I want to find the similar location names using couchbase server. i created an index as follows function (doc, meta) { emit(doc.loc_name, doc); } this is how i query data http://IP Address:8092/dev-locations/_design/dev_test_view/_view/searchByLocationName?full_set=true&inclusive_end=true&stale=false&connection_timeout=60000&key=%22Joh%22 But this will return only if the exact match found. What i am looking for is when i send the key joh , it should return johenaskirchen and johenasberg (same