mongotemplate

问题 I am new to Spring Boot and MongoDb. Trying some examples with Mongo Repositories and Spring Boot. But after going through some of the documents found that Mongo Template is will be a better option. Unable to get a proper Spring Boot with Mongo Template example. Can someone please help me out with an example for the same. Do we need to create a User defined Repositories interface and extend Repositories or CRUD Repository, while trying for Mongo Template ? 回答1: For further explanation, you

问题 I am new to Spring Boot and MongoDb. Trying some examples with Mongo Repositories and Spring Boot. But after going through some of the documents found that Mongo Template is will be a better option. Unable to get a proper Spring Boot with Mongo Template example. Can someone please help me out with an example for the same. Do we need to create a User defined Repositories interface and extend Repositories or CRUD Repository, while trying for Mongo Template ? 回答1: For further explanation, you

问题 I am new to Spring Boot and MongoDb. Trying some examples with Mongo Repositories and Spring Boot. But after going through some of the documents found that Mongo Template is will be a better option. Unable to get a proper Spring Boot with Mongo Template example. Can someone please help me out with an example for the same. Do we need to create a User defined Repositories interface and extend Repositories or CRUD Repository, while trying for Mongo Template ? 回答1: For further explanation, you

来源： https://stackoverflow.com/questions/64741485/how-to-update-field-in-mongo-db-if-not-exist-if-exists-then-update-other-fields

来源： https://stackoverflow.com/questions/64741485/how-to-update-field-in-mongo-db-if-not-exist-if-exists-then-update-other-fields

来源： https://stackoverflow.com/questions/41417655/spring-data-mongodb-remove-a-property-from-a-document-using-mongotemplate

问题 I am trying to get list of sorted distinct fields: public List<Object> getDistinctValues(String collection, String fieldName) { Query query = new Query(); query.with(new Sort(Sort.Direction.ASC, fieldName)); return mongoTemplate.findDistinct(query, fieldName, collection, Object.class); } but sorting isn't applied. Is there any way to do it with mongoTemplate? spring-boot-starter-data-mongodb: 2.1.2.RELEASE 回答1: Based on previous answer I solved my problem with Mongo Aggregation: @Override

问题 I am trying to get list of sorted distinct fields: public List<Object> getDistinctValues(String collection, String fieldName) { Query query = new Query(); query.with(new Sort(Sort.Direction.ASC, fieldName)); return mongoTemplate.findDistinct(query, fieldName, collection, Object.class); } but sorting isn't applied. Is there any way to do it with mongoTemplate? spring-boot-starter-data-mongodb: 2.1.2.RELEASE 回答1: Based on previous answer I solved my problem with Mongo Aggregation: @Override

问题 I Have a list of updated objects/documents i need save all the objects in the list at once. I saw save() in MongoTemplate but it can take single document at a time. Is there any way to save multiple documents at once or i need to call save in loop ? 回答1: Thanks for all the help. I was able to do it using Spring data MongoDB. Spring data MongoDB's MongoRepository has many inbuilt methods. org.springframework.data.mongodb.repository.MongoRepository.saveAll(Iterable entites) is the one which i

问题 I use mongodb and spring-boot in a project. I used manual reference to point out a collection, My structure is like follwing. Reel collection { _id : "reel_id_1", name: "reel 1", category :[ { _id : "category_id_1", name: "category 1", videos: ["video_id_1","video_id_2"] } ] } Video collection { _id: "video_id_1", // first document name: "mongo" } { _id: "video_id_2", // seconddocument name: "java" } Java classes are @Document @Data public class Reel { @Id private ObjectId _id; private String