working example with Page

Author: Nikita Konev

src/main/kotlin/com/example/web/jdbc/web/jdbc/Application.kt

@@ -5,6 +5,8 @@ import org.springframework.boot.ApplicationArguments
 import org.springframework.boot.ApplicationRunner
 import org.springframework.boot.autoconfigure.SpringBootApplication
 import org.springframework.boot.runApplication
+import org.springframework.data.domain.PageRequest
+import org.springframework.data.domain.Pageable
 import org.springframework.stereotype.Component
 
 @SpringBootApplication
@@ -15,8 +17,11 @@ fun main(args: Array<String>) {
 }
 
 @Component
-class AppRunner(private val subjectRepository: SubjectRepository,
-           private val branchRepository: BranchRepository) : ApplicationRunner {
+class AppRunner(
+        private val subjectRepository: SubjectRepository,
+        private val branchRepository: BranchRepository,
+        private val personRepository: PersonRepository
+) : ApplicationRunner {
 
     private val logger = LoggerFactory.getLogger(this::class.java)
 
@@ -59,5 +64,9 @@ class AppRunner(private val subjectRepository: SubjectRepository,
         logger.info("Checking if subjects still presents")
         val allSubjects = subjectRepository.findAll()
         allSubjects.forEach { logger.info("Found subject {}", it) }
+
+        // https://docs.spring.io/spring-data/jdbc/docs/current/reference/html/#jdbc.query-methods
+        val foundPersons = personRepository.findByLastName("Doe", PageRequest.of(1, 10))
+        foundPersons.forEach { logger.info("Found Person {}", it) }
     }
 }

src/main/kotlin/com/example/web/jdbc/web/jdbc/Entities.kt

@@ -27,3 +27,5 @@ data class Branch(
 }
 
 data class BranchData(val buildingType: String?, var rating: Int, var comment: String?)
+
+data class Person (val id: Long, var firstName: String, var lastName: String)

src/main/kotlin/com/example/web/jdbc/web/jdbc/Repositories.kt

@@ -1,5 +1,7 @@
 package com.example.web.jdbc.web.jdbc
 
+import org.springframework.data.domain.Page
+import org.springframework.data.domain.Pageable
 import org.springframework.data.repository.CrudRepository
 import org.springframework.stereotype.Repository
 
@@ -8,4 +10,9 @@ import org.springframework.stereotype.Repository
 interface SubjectRepository : CrudRepository<Subject, Long>
 
 @Repository
-interface BranchRepository : CrudRepository<Branch, Long>
+interface BranchRepository : CrudRepository<Branch, Long>
+
+@Repository
+interface PersonRepository : CrudRepository<Person, Long> {
+    fun findByLastName(lastname: String, pageable: Pageable) : Page<Person>
+}

src/main/resources/db/changelog.yml

@@ -10,4 +10,16 @@ databaseChangeLog:
       author: nkonev
       changes:
         - sqlFile:
-            path: /db/changelog/1648459518__branch_data_jsonb.sql
+            path: /db/changelog/1648459518__branch_data_jsonb.sql
+  - changeSet:
+      id: 3
+      author: nkonev
+      changes:
+        - sqlFile:
+            path: /db/changelog/1648633719__person.sql
+  - changeSet:
+      id: 4
+      author: nkonev
+      changes:
+        - sqlFile:
+            path: /db/changelog/1648633720__person_doe.sql

src/main/resources/db/changelog/1648633719__person.sql

@@ -0,0 +1,4 @@
+CREATE TABLE person(id BIGSERIAL PRIMARY KEY, first_name text not null , last_name text not null);
+
+INSERT INTO person (first_name, last_name)
+SELECT 'John' || i, 'Doe' || i FROM generate_series(0, 200) AS i;

src/main/resources/db/changelog/1648633720__person_doe.sql

@@ -0,0 +1,2 @@
+INSERT INTO person (first_name, last_name)
+SELECT 'John' || i, 'Doe' FROM generate_series(0, 50) AS i;