Spring Data: Bridging Multiple Databases/

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Couchbase Documents and Repositories

Couchbase Documents and Repositories

Explore documents and repositories through the Spring Data Couchbase framework.

We'll cover the following...

Couchbase documents are JSON-based data structures that represent database records and repositories and provide an abstraction layer to interact with documents using high-level APIs and query methods for CRUD operations.

Documents

Let’s cover the same example of the Book and Author POJOs referencing the book and author database documents and convert them into Couchbase document classes.

The Book document

Let’s learn a few handy annotations to transform a POJO into a Couchbase document.

The most common annotations are @Document and @Id.

  • The @Document annotation allows mapping a POJO to a database document by the underlying data access layer.

  • The @Id annotation allows mapping a property to an identifier in the database document.

We can use these annotations to convert the Book POJO from the com.smartdiscover.model package to a Couchbase document and map it to the book document:

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package com.smartdiscover.model;
import lombok.Data;
import org.springframework.data.annotation.*;
import org.springframework.data.couchbase.core.mapping.Document;
import org.springframework.data.couchbase.core.mapping.Field;
import org.springframework.data.couchbase.core.mapping.id.GeneratedValue;
import org.springframework.data.couchbase.core.mapping.id.GenerationStrategy;
import java.util.Date;
import java.util.List;
import java.util.stream.Collectors;
import java.util.List;
@Data
@Document
public class Book {
    @Id
    @GeneratedValue(strategy = GenerationStrategy.UNIQUE)
    private String id;
    private String name;
    private String summary;
    private List<Author> authors;
    @Override
    public String toString() {
        return "Book{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", summary='" + summary + '\'' +
                ((null != authors) ? ", authors=" + authors.stream().map(i -> i.getFullName()).collect(Collectors.toList()) + '\'' : "") +
                '}';
    }
}

Here’s an explanation of the code:

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