♥ fields attribute is used for projections, where 1 indicates include field, and 0 indicates to exclude the field. Further, if there were more parameters, they could be referred to ?1, ?2, and so forth. ♥ ‘?0’ indicates that the mentioned property should be equal to the zeroth parameter to the query method. import .Id import. import lombok.AllArgsConstructor import lombok.Data import lombok.NoArgsConstructor = "Books" ) public class Book Moreover, we are using ‘ Lombok‘ in order to reduce the boilerplate code. It is just to illustrate the use of element ‘collection’ in annotation. However, we will consider the collection name as ‘Books’ in MongoDB. Hence, create a Book.java class as below. ![]() Here we will use Book as an entity to illustrate the examples. If you are using MongoDB in authentication mode, include the username and password of it accordingly. Furthermore, if you are new to ‘Lombok’, kindly visit ‘ How to configure Lombok‘ and to know all about it in detail. While creating a project in STS, add starters ‘Spring Data MongoDB’, and ‘Lombok’ in order to get the features of MongoDB. If you are new to Spring Boot, visit Internal Link to create a sample project in spring boot using STS. Here, we will use STS(Spring Tool Suite) to create our Spring Boot Project. Step#1 : Create a Spring Boot Project using STS (Spring Tool Suite) In order to get hold on Spring Boot with MongoDB, kindly visit ‘ How to work with MongoDB in Spring Boot?‘. Here, you will also get some handy commands to work with MongoDB. If not, kindly visit ‘ How to install MongoDB in your system ?‘. Make sure you already have installed MongoDB in your system. Thereafter, we will start testing Query Examples step by step. In order to develop and test Query examples, we will first write codes and insert some records into DB. We can even take advantage of MongoDB native operators and operations using this annotation. It is also sometimes very handy in executing native MongoDB queries. Moreover, with this annotation, we can execute almost all the complex queries. We can check all Optional Element’s of from the official website. For example, :?0}”) clearly indicates that the annotation is accepting JSON query string. However, the only difference is that in case of MongoDB, takes a JSON query string instead of a JPA query. It works equally well with MongoDB as it does with JPA. We can use the annotation to specify a custom query to declare a method of custom Repository. 14 Links to Other tutorials on MongoDB with Spring Boot Why to use Annotation with Spring Boot & MongoDB?. ![]()
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