QueryLookupStrategy CREATE

QueryLookupStrategy#CREATE tries to construct the underlying database-specific query from the method name. Usually, it's done by removing the well-known prefix from the method name and parse the method resolve parameters. it will ignore any query defined for the method.

in below example a Query has already been defined which will query for appleName Fuji, but spring data jpa will not consider it and construct a new query for underlying database by parsing and resolving the method.

drop database if exists AppleDb;
create database AppleDb;
use AppleDb;
CREATE TABLE apple ( apple_id BIGINT NOT NULL, apple_name VARCHAR(255) DEFAULT NULL, PRIMARY KEY (apple_id)) ENGINE=INNODB;
CREATE TABLE hibernate_sequence ( next_val BIGINT) ENGINE=INNODB;

insert into hibernate_sequence values ( 6 );
insert into apple (apple_id, apple_name ) values (1, "Macintosh");
insert into apple (apple_id, apple_name ) values (2, "Fuji");
insert into apple (apple_id, apple_name ) values (3, "Gala");
insert into apple (apple_id, apple_name ) values (4, "Jonagold");
insert into apple (apple_id, apple_name ) values (5, "GrannySmith");

package com.sujan.example.jpa.controller;

import com.sujan.example.jpa.entity.Apple;
import com.sujan.example.jpa.repository.AppleRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
public class AppleController {
    @Autowired
    private AppleRepository appleRepository;

    @GetMapping
    List<Apple> findByAppleName() {
        List<Apple> findByAppleName = appleRepository.findByAppleName("Macintosh");
        System.out.println("findByAppleName = " + findByAppleName);
        return findByAppleName;
    }
}

package com.sujan.example.jpa.entity;

import lombok.Data;
import lombok.NoArgsConstructor;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

@Data
@Entity
@NoArgsConstructor
public class Apple {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long appleId;
    private String appleName;
}

package com.sujan.example.jpa.repository;

import com.sujan.example.jpa.entity.Apple;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Query;

import java.util.List;

public interface AppleRepository extends JpaRepository<Apple, Long> {
    @Query("SELECT a FROM Apple a WHERE a.appleName = 'Fuji'")
    List<Apple> findByAppleName(String appleName);
}

package com.sujan.example.jpa;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.data.repository.query.QueryLookupStrategy;

@SpringBootApplication
@EnableJpaRepositories(queryLookupStrategy = QueryLookupStrategy.Key.CREATE)
public class JpaApplication {
    public static void main(String[] args) {
        SpringApplication.run(JpaApplication.class, args);
    }
}

spring.datasource.url=jdbc:mysql://localhost:3306/AppleDb
spring.datasource.username=root
spring.datasource.password=root

plugins {
    id 'org.springframework.boot' version '2.3.3.RELEASE'
    id 'io.spring.dependency-management' version '1.0.10.RELEASE'
    id 'java'
}
group = 'com.sujan'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '11'
configurations {
    compileOnly {
        extendsFrom annotationProcessor
    }
}
repositories {
    mavenCentral()
}
dependencies {
    implementation 'org.springframework.boot:spring-boot-starter-web'
    annotationProcessor 'org.projectlombok:lombok'
    compileOnly 'org.projectlombok:lombok'
    implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
    runtimeOnly 'mysql:mysql-connector-java'
    testImplementation('org.springframework.boot:spring-boot-starter-test') {
        exclude group: 'org.junit.vintage', module: 'junit-vintage-engine'
    }
}
test {
    useJUnitPlatform()
}

curl --location --request GET 'http://localhost:8080/'

select apple0_.apple_id as apple_id1_0_, apple0_.apple_name as apple_na2_0_ from apple apple0_ where apple0_.apple_name=?
findByAppleName = [Apple(appleId=1, appleName=Macintosh)]