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Spring Data: Bridging Multiple Databases

Redis Object Mapping and Repositories

Explore how to map Java objects to Redis hashes using Spring Data Redis and develop repositories for CRUD operations. Learn to create entity classes, leverage Spring Data's repository interfaces, and manage data seamlessly within a Redis datastore.

We'll cover the following...

Object mapping and repositories in Spring Data Redis provide a smooth integration between Java objects and Redis data structures, leveraging serialization and deserialization capabilities. Spring Data Redis repositories simplify data access by providing high-level abstractions for common Redis operations, such as CRUD operations and querying.

POJOs

We’ll cover the same example of the Book and Author POJOs referencing the Redis hashes book and author and convert them into entity classes.

Create a Book entity

We’ll create the Book POJO class in the com.smartdiscover.model package to map it to the book Redis hash.

Java
package com.smartdiscover.model;
import lombok.Data;
import org.springframework.data.redis.core.RedisHash;
import java.io.Serializable;
import java.util.List;
import java.util.stream.Collectors;
@Data
@RedisHash("book")
public class Book implements Serializable {
    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 for the code:

  • Line 10: We use Lombok’s @Data annotation to automatically create the getters and setters of the ...