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Prepare Work ​

Summary ​

Ngbatis provides two ways for developers to access nebula.

  • Close to Mybatis-plus, providing a basic DAO to be extends, unnecessary to write any nGQL to operate single table, include vertex and edge. (See By Basic DAO for more details)
  • Close to Mybatis, supporting developers to write complex nGQL or Cypher to finish read or write data. (See By Custom nGQL for more details)

Take Person 与 Like as examples.

Create Schema in Nebula (refer CREATE TAG、CREATE EDGE、CREATE INDEX) ​

sql
CREATE tag `person` (
  `name` string NULL  , 
  `gender` string NULL  , 
  `height` double NULL ,
  `age` int NULL  , 
  `birthday` date NULL  
);
sql
CREATE edge `like` (`likeness` double NULL  );
sql
-- create index for query
CREATE TAG INDEX `i_person_name_age` on `person`(`name`(50), `age`);
CREATE TAG INDEX `i_person_name` on `person`(`name`(50));

Necessary POJO for two ways' ​

Person.java ​

java
package your.domain;

import javax.persistence.Id;
import javax.persistence.Table;
import java.util.Date;
import lombok.Data;

@Data
@Table(name = "person")
public class Person {
    @Id
    private String name;
    private String gender;
    @ValueType(Double.class)
    private BigDecimal height;
    private Integer age;
    private Date birthday;
}

Like.java ​

java
package your.domain;

import lombok.Data;
import javax.persistence.Table;
import lombok.Data;

@Data
@Table(name = "like")
public class Like {
    private Double likeness;
}

LikeWithRank.java ​

java
package your.domain;

import javax.persistence.Id;
import javax.persistence.Table;
import lombok.Data;

@Table(name = "like")
public class LikeWithRank {
    @Id
    private Long rank;
    private Double likeness;
}

By now, the 'POJO' used in the two usage examples has been created. Let's start our coding journey.