2022-11 spring-10-orm added

2026-05-30 10:50:42 +00:00 · 2022-12-27 11:46:14 +04:00
parent deb3b4394a
commit e1e60bb416
127 changed files with 3303 additions and 0 deletions
@@ -0,0 +1,4 @@
+.idea/
+*.iml
+
+target/
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+HELP.md
+/target/
+!.mvn/wrapper/maven-wrapper.jar
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+/build/
+
+### VS Code ###
+.vscode/
@@ -0,0 +1,2 @@
+# mybatis-demo
+Пример работы с БД через MyBatis
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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>2.7.6</version>
+        <relativePath/>
+    </parent>
+    <groupId>ru.otus.example</groupId>
+    <artifactId>mybatis-demo</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <name>mybatis-demo</name>
+    <description>MyBatis demo</description>
+
+    <properties>
+        <java.version>11</java.version>
+        <maven.compiler.source>11</maven.compiler.source>
+        <maven.compiler.target>11</maven.compiler.target>
+        <mybatis.version>2.2.2</mybatis.version>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.mybatis.spring.boot</groupId>
+            <artifactId>mybatis-spring-boot-starter</artifactId>
+            <version>${mybatis.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>com.h2database</groupId>
+            <artifactId>h2</artifactId>
+            <scope>runtime</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <optional>true</optional>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+
+
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>
@@ -0,0 +1,14 @@
+package ru.otus.example.mybatisdemo;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.ConfigurableApplicationContext;
+
+@SpringBootApplication
+public class MyBatisDemoApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(MyBatisDemoApplication.class, args);
+	}
+
+}
@@ -0,0 +1,13 @@
+package ru.otus.example.mybatisdemo.models;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class Avatar {
+    private long id;
+    private String photoUrl;
+}
@@ -0,0 +1,13 @@
+package ru.otus.example.mybatisdemo.models;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class Course {
+    private long id;
+    private String name;
+}
@@ -0,0 +1,13 @@
+package ru.otus.example.mybatisdemo.models;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class EMail {
+    private long id;
+    private String email;
+}
@@ -0,0 +1,18 @@
+package ru.otus.example.mybatisdemo.models;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import java.util.List;
+
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class OtusStudent {
+    private long id;
+    private String name;
+    private Avatar avatar;
+    private List<EMail> emails;
+    private List<Course> courses;
+}
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+package ru.otus.example.mybatisdemo.repositories;
+
+import org.apache.ibatis.annotations.Mapper;
+import org.apache.ibatis.annotations.Result;
+import org.apache.ibatis.annotations.Results;
+import org.apache.ibatis.annotations.Select;
+import ru.otus.example.mybatisdemo.models.Avatar;
+
+@Mapper
+public interface AvatarRepository {
+    @Select("select * from avatars where id = #{id}")
+    @Results(value = {
+            @Result(property = "id", column = "id"),
+            @Result(property = "photoUrl", column = "photo_url")
+    })
+    Avatar getAvatarById(long id);
+
+}
@@ -0,0 +1,17 @@
+package ru.otus.example.mybatisdemo.repositories;
+
+import org.apache.ibatis.annotations.Mapper;
+import org.apache.ibatis.annotations.Select;
+import ru.otus.example.mybatisdemo.models.Course;
+
+import java.util.List;
+
+@Mapper
+public interface CourseRepository {
+
+    @Select("select * " +
+            "from student_courses sc left join courses c on sc.course_id = c.id " +
+            "where sc.student_id = #{studentId}")
+    List<Course> getCoursesByStudentId(long studentId);
+
+}
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+package ru.otus.example.mybatisdemo.repositories;
+
+import org.apache.ibatis.annotations.Mapper;
+import org.apache.ibatis.annotations.Select;
+import ru.otus.example.mybatisdemo.models.EMail;
+
+import java.util.List;
+
+@Mapper
+public interface EmailRepository {
+
+    @Select("select * from emails where student_id = #{studentId}")
+    List<EMail> getEmailsByStudentId(long studentId);
+}
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+package ru.otus.example.mybatisdemo.repositories;
+
+import org.apache.ibatis.annotations.*;
+import org.apache.ibatis.mapping.FetchType;
+import ru.otus.example.mybatisdemo.models.Avatar;
+import ru.otus.example.mybatisdemo.models.OtusStudent;
+
+import java.util.List;
+
+@Mapper
+public interface OtusStudentRepository {
+
+    @Select("select * from otus_students")
+    @Results(id = "studentAllMap", value = {
+            @Result(property = "id", column = "id"),
+            @Result(property = "name", column = "name"),
+            @Result(property = "avatar", column = "avatar_id", javaType = Avatar.class,
+                    one = @One(select = "ru.otus.example.mybatisdemo.repositories.AvatarRepository.getAvatarById", fetchType = FetchType.EAGER)),
+            @Result(property = "emails", column = "id", javaType = List.class,
+                    many = @Many(select = "ru.otus.example.mybatisdemo.repositories.EmailRepository.getEmailsByStudentId", fetchType = FetchType.EAGER)),
+            @Result(property = "courses", column = "id", javaType = List.class,
+                    many = @Many(select = "ru.otus.example.mybatisdemo.repositories.CourseRepository.getCoursesByStudentId", fetchType = FetchType.EAGER))
+    })
+    List<OtusStudent> findAllWithAllInfo();
+
+    @Select("select * from otus_students where id = #{id}")
+    @ResultMap("studentAllMap")
+    OtusStudent findById(long id);
+
+    @Select("select count(*) as students_count from otus_students")
+    long getStudentsCount();
+
+    @Insert("insert into otus_students(name, avatar_id) values (#{name}, #{avatar.id})")
+    void insert(OtusStudent student);
+
+    @Update("update otus_students set name = #{name} where id = #{id}")
+    void updateName(OtusStudent student);
+
+    @Delete("delete from otus_students where id = #{id}")
+    void deleteById(long id);
+
+}
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+create table avatars(
+    id bigserial,
+    photo_url varchar(8000),
+    primary key (id)
+);
+
+create table courses(
+    id bigserial,
+    name varchar(255),
+    primary key (id)
+);
+
+create table otus_students(
+    id bigserial,
+    name varchar(255),
+    avatar_id bigint references avatars (id),
+    primary key (id)
+);
+
+create table emails(
+    id bigserial,
+    student_id bigint references otus_students(id) on delete cascade,
+    email varchar(255),
+    primary key (id)
+);
+
+create table student_courses(
+    student_id bigint references otus_students(id) on delete cascade,
+    course_id bigint references courses(id),
+    primary key (student_id, course_id)
+);
@@ -0,0 +1,110 @@
+package ru.otus.example.mybatisdemo.repositories;
+
+import lombok.val;
+import org.assertj.core.api.recursive.comparison.RecursiveComparisonConfiguration;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.transaction.annotation.Transactional;
+import ru.otus.example.mybatisdemo.models.Avatar;
+import ru.otus.example.mybatisdemo.models.OtusStudent;
+
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@DisplayName("Репозиторий на основе MyBatis для работы со студентами ")
+@SpringBootTest
+@Transactional
+public class OtusStudentRepositoryTest {
+
+    private static final String FIELD_ID = "id";
+    private static final String FIELD_PHOTO_URL = "photoUrl";
+    private static final String FIELD_NAME = "name";
+
+    private static final long FIRST_STUDENT_ID = 1L;
+    private static final long FIRST_AVATAR_ID = 1L;
+    private static final String FIRST_STUDENT_NAME = "student_01";
+    private static final String FIRST_AVATAR_URL = "photoUrl_01";
+    private static final String STUDENT_NEW_NAME = "Висусуалий";
+
+    private static final int EXPECTED_NUMBER_OF_STUDENTS = 10;
+    private static final long INSERTED_STUDENT_ID = 11L;
+    private static final int EXPECTED_EMAILS_COUNT = 2;
+    private static final int EXPECTED_COURSES_COUNT = 3;
+
+    @Autowired
+    private OtusStudentRepository studentRepositoryMyBatis;
+
+    @DisplayName("должен загружать список всех студентов с полной информацией о них")
+    @Test
+    void shouldReturnCorrectStudentsListWithAllInfo() {
+        val students = studentRepositoryMyBatis.findAllWithAllInfo();
+        assertThat(students).isNotNull().hasSize(EXPECTED_NUMBER_OF_STUDENTS)
+                .allMatch(s -> !s.getName().equals(""))
+                .allMatch(s -> s.getCourses() != null && s.getCourses().size() > 0)
+                .allMatch(s -> s.getAvatar() != null)
+                .allMatch(s -> s.getEmails() != null && s.getEmails().size() > 0);
+    }
+
+    @DisplayName("должен загружать число студентов в БД")
+    @Test
+    void shouldReturnCorrectStudentsCount() {
+        long studentsCount = studentRepositoryMyBatis.getStudentsCount();
+        assertThat(studentsCount).isEqualTo(EXPECTED_NUMBER_OF_STUDENTS);
+    }
+
+    @DisplayName(" должен загружать информацию о нужном студенте")
+    @Test
+    void shouldFindExpectedStudentById(){
+        val actualStudent = studentRepositoryMyBatis.findById(FIRST_STUDENT_ID);
+
+        assertThat(actualStudent).isNotNull();
+        assertThat(actualStudent.getName()).isEqualTo(FIRST_STUDENT_NAME);
+        assertThat(actualStudent.getAvatar()).isNotNull()
+                .hasFieldOrPropertyWithValue(FIELD_ID, FIRST_STUDENT_ID)
+                .hasFieldOrPropertyWithValue(FIELD_PHOTO_URL, FIRST_AVATAR_URL);
+        assertThat(actualStudent.getEmails()).isNotNull().hasSize(EXPECTED_EMAILS_COUNT);
+        assertThat(actualStudent.getCourses()).isNotNull().hasSize(EXPECTED_COURSES_COUNT);
+    }
+
+    @DisplayName(" должен сохранить, а потом загрузить информацию о нужном студенте")
+    @Test
+    void shouldSaveAndLoadCorrectStudent() {
+        val expectedStudent = new OtusStudent(0, STUDENT_NEW_NAME,
+                new Avatar(FIRST_AVATAR_ID, FIRST_AVATAR_URL), List.of(), List.of());
+        studentRepositoryMyBatis.insert(expectedStudent);
+        val actualStudent = studentRepositoryMyBatis.findById(INSERTED_STUDENT_ID);
+
+        assertThat(actualStudent)
+                .isNotNull()
+                .usingRecursiveComparison(
+                        RecursiveComparisonConfiguration.builder()
+                                .withIgnoredFields(FIELD_ID).build())
+                .isEqualTo(expectedStudent);
+    }
+
+
+    @DisplayName(" должен обновлять имя студента в БД")
+    @Test
+    void shouldUpdateStudentName() {
+        val student = studentRepositoryMyBatis.findById(FIRST_STUDENT_ID);
+        student.setName(STUDENT_NEW_NAME);
+        studentRepositoryMyBatis.updateName(student);
+        val actualStudent = studentRepositoryMyBatis.findById(FIRST_STUDENT_ID);
+
+        assertThat(actualStudent).isNotNull().hasFieldOrPropertyWithValue(FIELD_NAME, student.getName());
+    }
+
+    @DisplayName("должен удалять студента из БД по id")
+    @Test
+    void shouldDeleteStudentFromDbById() {
+        val studentsCountBefore = studentRepositoryMyBatis.getStudentsCount();
+        studentRepositoryMyBatis.deleteById(FIRST_STUDENT_ID);
+        val studentsCountAfter = studentRepositoryMyBatis.getStudentsCount();
+
+        assertThat(studentsCountBefore - studentsCountAfter).isEqualTo(1);
+    }
+
+}
@@ -0,0 +1,8 @@
+spring:
+  datasource:
+    url: jdbc:h2:mem:testdb
+    initialization-mode: always
+
+logging:
+  level:
+    ru.otus.example.mybatisdemo.repositories: TRACE
@@ -0,0 +1,29 @@
+insert into avatars(photo_url)
+values ('photoUrl_01'), ('photoUrl_02'), ('photoUrl_03'), ('photoUrl_04'), ('photoUrl_05'),
+       ('photoUrl_06'), ('photoUrl_07'), ('photoUrl_08'), ('photoUrl_09'), ('photoUrl_10');
+
+insert into courses(name)
+values ('course_name_01'), ('course_name_02'), ('course_name_03'), ('course_name_04'), ('course_name_05'),
+       ('course_name_06'), ('course_name_07'), ('course_name_08'), ('course_name_09'), ('course_name_10'), ('not_used_11');
+
+insert into otus_students(name, avatar_id)
+values ('student_01', 1), ('student_02', 2), ('student_03', 3), ('student_04', 4), ('student_05', 5),
+       ('student_06', 6), ('student_07', 7), ('student_08', 8), ('student_09', 9), ('student_10', 10);
+
+
+insert into emails(email, student_id)
+values ('email_01', 1), ('email_02', 1), ('email_03', 2), ('email_04', 2), ('email_05', 3), ('email_06', 4),
+       ('email_07', 5), ('email_08', 6), ('email_09', 7), ('email_10', 8), ('email_11', 9), ('email_12', 10);
+
+
+insert into student_courses(student_id, course_id)
+values (1, 1),   (1, 2),   (1, 3),
+       (2, 2),   (2, 4),   (2, 5),
+       (3, 3),   (3, 6),   (3, 7),
+       (4, 4),   (4, 8),   (4, 9),
+       (5, 5),   (5, 10),  (5, 1),
+       (6, 6),   (6, 2),   (6, 3),
+       (7, 7),   (7, 4),   (7, 5),
+       (8, 8),   (8, 6),   (8, 7),
+       (9, 9),   (9, 8),   (9, 10),
+       (10, 10), (10, 1),  (10, 2);
@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>ru.otus</groupId>
+    <artifactId>demo-projects</artifactId>
+    <version>1.0</version>
+
+    <packaging>pom</packaging>
+
+    <modules>
+        <module>spring-jdbc-demo</module>
+        <module>spring-jpa-ineritance-demo</module>
+        <module>mybatis-demo</module>
+    </modules>
+</project>
@@ -0,0 +1,29 @@
+HELP.md
+/target/
+!.mvn/wrapper/maven-wrapper.jar
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+/build/
+
+### VS Code ###
+.vscode/
@@ -0,0 +1,2 @@
+# spring-jdbc-demo
+Пример работы с БД через jdbc
@@ -0,0 +1,57 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>2.7.6</version>
+        <relativePath/>
+    </parent>
+    <groupId>ru.otus.example</groupId>
+    <artifactId>spring-jdbc-demo</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <name>spring-jdbc-demo</name>
+    <description>Spring jdbc demo</description>
+
+    <properties>
+        <java.version>11</java.version>
+        <maven.compiler.source>11</maven.compiler.source>
+        <maven.compiler.target>11</maven.compiler.target>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-data-jdbc</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>com.h2database</groupId>
+            <artifactId>h2</artifactId>
+            <scope>runtime</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <optional>true</optional>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>
@@ -0,0 +1,13 @@
+package ru.otus.example.springjdbcdemo;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class SpringJdbcDemoApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(SpringJdbcDemoApplication.class, args);
+	}
+
+}
@@ -0,0 +1,13 @@
+package ru.otus.example.springjdbcdemo.models;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class Avatar {
+    private long id;
+    private String photoUrl;
+}
@@ -0,0 +1,13 @@
+package ru.otus.example.springjdbcdemo.models;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class Course {
+    private long id;
+    private String name;
+}
@@ -0,0 +1,13 @@
+package ru.otus.example.springjdbcdemo.models;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class EMail {
+    private long id;
+    private String email;
+}
@@ -0,0 +1,18 @@
+package ru.otus.example.springjdbcdemo.models;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import java.util.List;
+
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class OtusStudent {
+    private long id;
+    private String name;
+    private Avatar avatar;
+    private List<EMail> emails;
+    private List<Course> courses;
+}
@@ -0,0 +1,9 @@
+package ru.otus.example.springjdbcdemo.repositories;
+
+import ru.otus.example.springjdbcdemo.models.Course;
+
+import java.util.List;
+
+public interface CourseRepository {
+    List<Course> findAllUsed();
+}
@@ -0,0 +1,35 @@
+package ru.otus.example.springjdbcdemo.repositories;
+
+import lombok.RequiredArgsConstructor;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.jdbc.core.JdbcOperations;
+import org.springframework.jdbc.core.RowMapper;
+import org.springframework.stereotype.Repository;
+import ru.otus.example.springjdbcdemo.models.Course;
+
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.List;
+
+@Repository
+@RequiredArgsConstructor
+public class CourseRepositoryJdbc implements CourseRepository {
+
+    private final JdbcOperations op;
+
+    @Override
+    public List<Course> findAllUsed() {
+        return op.query("select c.id, c.name " +
+                          "from courses c inner join student_courses sc on c.id = sc.course_id " +
+                          "group by c.id, c.name " +
+                          "order by c.name", new CourseRowMapper());
+    }
+
+    private static class CourseRowMapper implements RowMapper<Course> {
+        @Override
+        public Course mapRow(ResultSet rs, int i) throws SQLException {
+            return new Course(rs.getLong(1), rs.getString(2));
+        }
+    }
+
+}
@@ -0,0 +1,9 @@
+package ru.otus.example.springjdbcdemo.repositories;
+
+import ru.otus.example.springjdbcdemo.models.OtusStudent;
+
+import java.util.List;
+
+public interface OtusStudentRepository {
+    List<OtusStudent> findAllWithAllInfo();
+}
@@ -0,0 +1,52 @@
+package ru.otus.example.springjdbcdemo.repositories;
+
+import lombok.RequiredArgsConstructor;
+import org.springframework.jdbc.core.JdbcOperations;
+import org.springframework.stereotype.Repository;
+import ru.otus.example.springjdbcdemo.models.Course;
+import ru.otus.example.springjdbcdemo.models.OtusStudent;
+import ru.otus.example.springjdbcdemo.repositories.ext.OtusStudentResultSetExtractor;
+import ru.otus.example.springjdbcdemo.repositories.ext.StudentCourseRelation;
+
+import java.util.*;
+import java.util.function.Function;
+import java.util.stream.Collectors;
+
+@Repository
+@RequiredArgsConstructor
+public class OtusStudentRepositoryJdbc implements OtusStudentRepository {
+
+    private final CourseRepository courseRepository;
+    private final JdbcOperations op;
+
+    @Override
+    public List<OtusStudent> findAllWithAllInfo() {
+        List<Course> courses = courseRepository.findAllUsed();
+        List<StudentCourseRelation> relations = getAllRelations();
+        Map<Long, OtusStudent> students =
+                op.query("select os.id, os.name, a.id avatar_id, a.photo_url, e.id email_id, e.email " +
+                        "from (otus_students os left join avatars a on " +
+                        "os.avatar_id = a.id) left join emails e on os.id = e.student_id",
+                new OtusStudentResultSetExtractor());
+
+        mergeStudentsInfo(students, courses, relations);
+        return new ArrayList<>(Objects.requireNonNull(students).values());
+    }
+
+    private List<StudentCourseRelation> getAllRelations() {
+        return op.query("select student_id, course_id from student_courses sc order by student_id, course_id",
+                (rs, i) -> new StudentCourseRelation(rs.getLong(1), rs.getLong(2)));
+    }
+
+    private void mergeStudentsInfo(Map<Long, OtusStudent> students, List<Course> courses,
+                                   List<StudentCourseRelation> relations) {
+        Map<Long, Course> coursesMap = courses.stream().collect(Collectors.toMap(Course::getId, Function.identity()));
+        relations.forEach(r -> {
+            if (students.containsKey(r.getStudentId()) && coursesMap.containsKey(r.getCourseId())) {
+                students.get(r.getStudentId()).getCourses().add(coursesMap.get(r.getCourseId()));
+            }
+        });
+    }
+
+
+}
@@ -0,0 +1,37 @@
+package ru.otus.example.springjdbcdemo.repositories.ext;
+
+import org.springframework.dao.DataAccessException;
+import org.springframework.jdbc.core.ResultSetExtractor;
+import ru.otus.example.springjdbcdemo.models.Avatar;
+import ru.otus.example.springjdbcdemo.models.EMail;
+import ru.otus.example.springjdbcdemo.models.OtusStudent;
+
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.Map;
+
+public class OtusStudentResultSetExtractor implements
+        ResultSetExtractor<Map<Long, OtusStudent>> {
+    @Override
+    public Map<Long, OtusStudent> extractData(ResultSet rs) throws SQLException,
+            DataAccessException {
+
+        Map<Long, OtusStudent> students = new HashMap<>();
+        while (rs.next()) {
+            long id = rs.getLong("id");
+            OtusStudent student = students.get(id);
+            if (student == null) {
+                student = new OtusStudent(id, rs.getString("name"),
+                        new Avatar(rs.getLong("avatar_id"), rs.getString("photo_url")),
+                        new ArrayList<>(), new ArrayList<>());
+                students.put(student.getId(), student);
+            }
+
+            student.getEmails().add(new EMail(rs.getLong("email_id"),
+                    rs.getString("email")));
+        }
+        return students;
+    }
+}
@@ -0,0 +1,11 @@
+package ru.otus.example.springjdbcdemo.repositories.ext;
+
+import lombok.Data;
+import lombok.RequiredArgsConstructor;
+
+@Data
+@RequiredArgsConstructor
+public class StudentCourseRelation {
+    private final long studentId;
+    private final long courseId;
+}
@@ -0,0 +1,31 @@
+create table avatars(
+    id bigserial,
+    photo_url varchar(8000),
+    primary key (id)
+);
+
+create table courses(
+    id bigserial,
+    name varchar(255),
+    primary key (id)
+);
+
+create table otus_students(
+    id bigserial,
+    name varchar(255),
+    avatar_id bigint references avatars (id),
+    primary key (id)
+);
+
+create table emails(
+    id bigserial,
+    student_id bigint references otus_students(id) on delete cascade,
+    email varchar(255),
+    primary key (id)
+);
+
+create table student_courses(
+    student_id bigint references otus_students(id) on delete cascade,
+    course_id bigint references courses(id),
+    primary key (student_id, course_id)
+);
@@ -0,0 +1,35 @@
+package ru.otus.example.springjdbcdemo.repositories;
+
+import lombok.val;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.jdbc.JdbcTest;
+import org.springframework.context.annotation.Import;
+
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@DisplayName("Репозиторий на основе Jdbc для работы со студентами ")
+@JdbcTest
+@Import({OtusStudentRepositoryJdbc.class, CourseRepositoryJdbc.class})
+class OtusStudentRepositoryJdbcTest {
+
+    private static final int EXPECTED_NUMBER_OF_STUDENTS = 10;
+
+    @Autowired
+    private OtusStudentRepositoryJdbc repositoryJdbc;
+
+    @DisplayName("должен загружать список всех студентов с полной информацией о них")
+    @Test
+    void shouldReturnCorrectStudentsListWithAllInfo() {
+        val students = repositoryJdbc.findAllWithAllInfo();
+        assertThat(students).isNotNull().hasSize(EXPECTED_NUMBER_OF_STUDENTS)
+                .allMatch(s -> !s.getName().equals(""))
+                .allMatch(s -> s.getCourses() != null && s.getCourses().size() > 0)
+                .allMatch(s -> s.getAvatar() != null)
+                .allMatch(s -> s.getEmails() != null && s.getEmails().size() > 0);
+        students.forEach(System.out::println);
+
+    }
+}
@@ -0,0 +1,4 @@
+spring:
+  datasource:
+    url: jdbc:h2:mem:testdb
+    initialization-mode: always
@@ -0,0 +1,29 @@
+insert into avatars(photo_url)
+values ('photoUrl_01'), ('photoUrl_02'), ('photoUrl_03'), ('photoUrl_04'), ('photoUrl_05'),
+       ('photoUrl_06'), ('photoUrl_07'), ('photoUrl_08'), ('photoUrl_09'), ('photoUrl_10');
+
+insert into courses(name)
+values ('course_name_01'), ('course_name_02'), ('course_name_03'), ('course_name_04'), ('course_name_05'),
+       ('course_name_06'), ('course_name_07'), ('course_name_08'), ('course_name_09'), ('course_name_10'), ('not_used_11');
+
+insert into otus_students(name, avatar_id)
+values ('student_01', 1), ('student_02', 2), ('student_03', 3), ('student_04', 4), ('student_05', 5),
+       ('student_06', 6), ('student_07', 7), ('student_08', 8), ('student_09', 9), ('student_10', 10);
+
+
+insert into emails(email, student_id)
+values ('email_01', 1), ('email_02', 1), ('email_03', 2), ('email_04', 2), ('email_05', 3), ('email_06', 4),
+       ('email_07', 5), ('email_08', 6), ('email_09', 7), ('email_10', 8), ('email_11', 9), ('email_12', 10);
+
+
+insert into student_courses(student_id, course_id)
+values (1, 1),   (1, 2),   (1, 3),
+       (2, 2),   (2, 4),   (2, 5),
+       (3, 3),   (3, 6),   (3, 7),
+       (4, 4),   (4, 8),   (4, 9),
+       (5, 5),   (5, 10),  (5, 1),
+       (6, 6),   (6, 2),   (6, 3),
+       (7, 7),   (7, 4),   (7, 5),
+       (8, 8),   (8, 6),   (8, 7),
+       (9, 9),   (9, 8),   (9, 10),
+       (10, 10), (10, 1),  (10, 2);
@@ -0,0 +1,29 @@
+HELP.md
+/target/
+!.mvn/wrapper/maven-wrapper.jar
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+/build/
+
+### VS Code ###
+.vscode/
@@ -0,0 +1,2 @@
+# spring-jdbc-demo
+Пример работы с БД через jdbc
@@ -0,0 +1,57 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>2.7.6</version>
+        <relativePath/>
+    </parent>
+    <groupId>ru.otus.example</groupId>
+    <artifactId>spring-jpa-ineritance-demo</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <name>spring-jpa-demo</name>
+    <description>Spring jpa demo</description>
+
+    <properties>
+        <java.version>11</java.version>
+        <maven.compiler.source>11</maven.compiler.source>
+        <maven.compiler.target>11</maven.compiler.target>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-data-jpa</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>com.h2database</groupId>
+            <artifactId>h2</artifactId>
+            <version>2.0.202</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <optional>true</optional>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>
@@ -0,0 +1,43 @@
+package ru.otus.example.ineritancedemo;
+
+import org.h2.tools.Console;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.ConfigurableApplicationContext;
+import ru.otus.example.ineritancedemo.model.A;
+import ru.otus.example.ineritancedemo.model.C;
+import ru.otus.example.ineritancedemo.model.B;
+import ru.otus.example.ineritancedemo.repository.ARepository;
+
+import java.sql.SQLException;
+import java.util.List;
+
+@SpringBootApplication
+public class InheritanceDemo {
+
+    public static void main(String[] args) throws SQLException {
+        ConfigurableApplicationContext ctx = SpringApplication.run(InheritanceDemo.class, args);
+        ARepository aRepository = ctx.getBean(ARepository.class);
+
+        System.out.println("\n\n-------------------------------------------\n\n");
+        System.out.println("Начинаем вставку сущностей A/B/C: ");
+
+        var a = new A(0, "aaaaaa1");
+        var b = new B(0, "aaaaaa2", "bbbbbbb");
+        var c = new C(0, "aaaaaa3", "ccccccc");
+        aRepository.save(a);
+        aRepository.save(b);
+        aRepository.save(c);
+
+        System.out.println("\n\n-------------------------------------------\n\n");
+        System.out.println("Загружаем все сущности A (в т.ч. наследников):");
+
+        List<A> resultList = aRepository.findAll();
+
+        System.out.println("\n\nРезультат:");
+        System.out.println(resultList);
+
+
+        Console.main();
+    }
+}
@@ -0,0 +1,37 @@
+package ru.otus.example.ineritancedemo.model;
+
+import javax.persistence.*;
+
+@Entity
+@DiscriminatorColumn(name = "discriminator")
+@DiscriminatorValue("RootA")
+@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
+//@Inheritance(strategy = InheritanceType.JOINED)
+//@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
+@Table(name = "A")
+public class A {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.SEQUENCE)
+    // Не получится использовать при InheritanceType.TABLE_PER_CLASS
+    //@GeneratedValue(strategy = GenerationType.IDENTITY)
+    protected long id;
+
+    protected String a;
+
+    public A() {
+    }
+
+    public A(long id, String a) {
+        this.id = id;
+        this.a = a;
+    }
+
+    @Override
+    public String toString() {
+        return "A{" +
+                "id=" + id +
+                ", a='" + a + '\'' +
+                '}';
+    }
+}
@@ -0,0 +1,30 @@
+package ru.otus.example.ineritancedemo.model;
+
+import javax.persistence.DiscriminatorValue;
+import javax.persistence.Entity;
+import javax.persistence.Table;
+
+@Entity
+@Table(name = "B")
+@DiscriminatorValue("LeafB")
+public class B extends A {
+    private String b;
+
+    public B() {
+        super();
+    }
+
+    public B(long id, String a, String b) {
+        super(id, a);
+        this.b = b;
+    }
+
+    @Override
+    public String toString() {
+        return "B{" +
+                "id=" + id +
+                ", a='" + a + '\'' +
+                ", b='" + b + '\'' +
+                '}';
+    }
+}
@@ -0,0 +1,33 @@
+package ru.otus.example.ineritancedemo.model;
+
+
+import javax.persistence.DiscriminatorValue;
+import javax.persistence.Entity;
+import javax.persistence.Table;
+
+
+@Entity
+@Table(name = "C")
+@DiscriminatorValue("LeafC")
+public class C extends A{
+    private String c;
+
+    public C() {
+        super();
+    }
+
+
+    public C(long id, String a, String c) {
+        super(id, a);
+        this.c = c;
+    }
+
+    @Override
+    public String toString() {
+        return "C{" +
+                "id=" + id +
+                ", a='" + a + '\'' +
+                ", c='" + c + '\'' +
+                '}';
+    }
+}
@@ -0,0 +1,10 @@
+package ru.otus.example.ineritancedemo.repository;
+
+import ru.otus.example.ineritancedemo.model.A;
+
+import java.util.List;
+
+public interface ARepository {
+    List<A> findAll();
+    void save(A a);
+}
@@ -0,0 +1,32 @@
+package ru.otus.example.ineritancedemo.repository;
+
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Repository;
+import org.springframework.transaction.annotation.Transactional;
+import ru.otus.example.ineritancedemo.model.A;
+
+import javax.persistence.EntityManager;
+import javax.persistence.PersistenceContext;
+import javax.persistence.TypedQuery;
+import java.util.List;
+
+@Repository
+@RequiredArgsConstructor
+public class ARepositoryJpa implements ARepository {
+
+    @PersistenceContext
+    private final EntityManager em;
+
+    @Transactional(readOnly = true) // Только для примера. Лучше вешать на методы сервисов
+    @Override
+    public List<A> findAll() {
+        TypedQuery<A> query = em.createQuery("select a from A a", A.class);
+        return query.getResultList();
+    }
+
+    @Transactional // Только для примера. Лучше вешать на методы сервисов
+    @Override
+    public void save(A a) {
+        em.persist(a);
+    }
+}
@@ -0,0 +1,20 @@
+spring:
+  datasource:
+    url: jdbc:h2:mem:testdb
+    initialization-mode: never
+
+  jpa:
+    generate-ddl: true
+    hibernate:
+      ddl-auto: create
+
+    properties:
+      hibernate:
+        format_sql: true
+
+    show-sql: true
+
+
+logging:
+  level:
+    ROOT: ERROR
@@ -0,0 +1,29 @@
+HELP.md
+/target/
+!.mvn/wrapper/maven-wrapper.jar
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+/build/
+
+### VS Code ###
+.vscode/
@@ -0,0 +1,57 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>2.7.6</version>
+        <relativePath/>
+    </parent>
+    <groupId>ru.otus.example</groupId>
+    <artifactId>orm-exercise</artifactId>
+    <name>orm-exercise</name>
+    <version>0.0.1-SNAPSHOT</version>
+
+    <properties>
+        <java.version>11</java.version>
+        <maven.compiler.source>11</maven.compiler.source>
+        <maven.compiler.target>11</maven.compiler.target>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-data-jpa</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>com.h2database</groupId>
+            <artifactId>h2</artifactId>
+            <version>2.1.214</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <optional>true</optional>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>
@@ -0,0 +1,17 @@
+package ru.otus.example.ormdemo;
+
+import org.h2.tools.Console;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+import java.sql.SQLException;
+
+@SpringBootApplication
+public class OrmDemoApplication {
+
+	public static void main(String[] args) throws SQLException {
+		SpringApplication.run(OrmDemoApplication.class, args);
+		Console.main(args);
+	}
+
+}
@@ -0,0 +1,15 @@
+package ru.otus.example.ormdemo.models;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.*;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class Avatar {
+    private long id;
+    private String photoUrl;
+}
@@ -0,0 +1,15 @@
+package ru.otus.example.ormdemo.models;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.*;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class Course {
+    private long id;
+    private String name;
+}
@@ -0,0 +1,15 @@
+package ru.otus.example.ormdemo.models;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.*;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class EMail {
+    private long id;
+    private String email;
+}
@@ -0,0 +1,18 @@
+package ru.otus.example.ormdemo.models;
+
+import lombok.*;
+
+import javax.persistence.*;
+import java.util.List;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class OtusStudent {
+    private long id;
+    private String name;
+
+    //private Avatar avatar;
+    //private List<EMail> emails;
+    //private List<Course> courses;
+}
@@ -0,0 +1,20 @@
+spring:
+  datasource:
+    url: jdbc:h2:mem:testdb
+    initialization-mode: never
+
+  jpa:
+    generate-ddl: true
+    hibernate:
+      ddl-auto: create
+
+    properties:
+      hibernate:
+        format_sql: true
+
+    show-sql: true
+
+
+logging:
+  level:
+    ROOT: ERROR
@@ -0,0 +1,29 @@
+HELP.md
+/target/
+!.mvn/wrapper/maven-wrapper.jar
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+/build/
+
+### VS Code ###
+.vscode/
@@ -0,0 +1,57 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>2.7.6</version>
+        <relativePath/>
+    </parent>
+    <groupId>ru.otus.example</groupId>
+    <artifactId>orm-solution-01</artifactId>
+    <name>orm-solution-01</name>
+    <version>0.0.1-SNAPSHOT</version>
+
+    <properties>
+        <java.version>11</java.version>
+        <maven.compiler.source>11</maven.compiler.source>
+        <maven.compiler.target>11</maven.compiler.target>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-data-jpa</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>com.h2database</groupId>
+            <artifactId>h2</artifactId>
+            <version>2.1.214</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <optional>true</optional>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>
@@ -0,0 +1,17 @@
+package ru.otus.example.ormdemo;
+
+import org.h2.tools.Console;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+import java.sql.SQLException;
+
+@SpringBootApplication
+public class OrmDemoApplication {
+
+	public static void main(String[] args) throws SQLException {
+		SpringApplication.run(OrmDemoApplication.class, args);
+		//Console.main(args);
+	}
+
+}
@@ -0,0 +1,17 @@
+package ru.otus.example.ormdemo.models;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.*;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Entity
+public class Avatar {
+    @Id
+    private long id;
+    private String photoUrl;
+}
@@ -0,0 +1,17 @@
+package ru.otus.example.ormdemo.models;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.*;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Entity
+public class Course {
+    @Id
+    private long id;
+    private String name;
+}
@@ -0,0 +1,17 @@
+package ru.otus.example.ormdemo.models;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.*;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Entity
+public class EMail {
+    @Id
+    private long id;
+    private String email;
+}
@@ -0,0 +1,20 @@
+package ru.otus.example.ormdemo.models;
+
+import lombok.*;
+
+import javax.persistence.*;
+import java.util.List;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Entity // Указывает, что данный класс является сущностью
+public class OtusStudent {
+    @Id // Позволяет указать какое поле является идентификатором
+    private long id;
+    private String name;
+
+    //private Avatar avatar;
+    //private List<EMail> emails;
+    //private List<Course> courses;
+}
@@ -0,0 +1,20 @@
+spring:
+  datasource:
+    url: jdbc:h2:mem:testdb
+    initialization-mode: never
+
+  jpa:
+    generate-ddl: true
+    hibernate:
+      ddl-auto: create
+
+    properties:
+      hibernate:
+        format_sql: true
+
+    show-sql: true
+
+
+logging:
+  level:
+    ROOT: ERROR
@@ -0,0 +1,29 @@
+HELP.md
+/target/
+!.mvn/wrapper/maven-wrapper.jar
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+/build/
+
+### VS Code ###
+.vscode/
@@ -0,0 +1,56 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>2.7.6</version>
+        <relativePath/>
+    </parent>
+    <groupId>ru.otus.example</groupId>
+    <artifactId>orm-solution-02</artifactId>
+    <name>orm-solution-02</name>
+    <version>0.0.1-SNAPSHOT</version>
+
+    <properties>
+        <java.version>11</java.version>
+        <maven.compiler.source>11</maven.compiler.source>
+        <maven.compiler.target>11</maven.compiler.target>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-data-jpa</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>com.h2database</groupId>
+            <artifactId>h2</artifactId>
+            <version>2.1.214</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <optional>true</optional>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>
@@ -0,0 +1,17 @@
+package ru.otus.example.ormdemo;
+
+import org.h2.tools.Console;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+import java.sql.SQLException;
+
+@SpringBootApplication
+public class OrmDemoApplication {
+
+	public static void main(String[] args) throws SQLException {
+		SpringApplication.run(OrmDemoApplication.class, args);
+		//Console.main(args);
+	}
+
+}
@@ -0,0 +1,20 @@
+package ru.otus.example.ormdemo.models;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.*;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Entity
+@Table(name = "avatars")
+public class Avatar {
+    @Id
+    private long id;
+
+    @Column(name = "photo_url")
+    private String photoUrl;
+}
@@ -0,0 +1,20 @@
+package ru.otus.example.ormdemo.models;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.*;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Entity
+@Table(name = "courses")
+public class Course {
+    @Id
+    private long id;
+
+    @Column(name = "name")
+    private String name;
+}
@@ -0,0 +1,21 @@
+package ru.otus.example.ormdemo.models;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.*;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Entity
+@Table(name = "emails")
+public class EMail {
+
+    @Id
+    private long id;
+
+    @Column(name = "email")
+    private String email;
+}
@@ -0,0 +1,24 @@
+package ru.otus.example.ormdemo.models;
+
+import lombok.*;
+
+import javax.persistence.*;
+import java.util.List;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Entity // Указывает, что данный класс является сущностью
+@Table(name = "otus_students") // Задает имя таблицы, на которую будет отображаться сущность
+public class OtusStudent {
+    @Id // Позволяет указать какое поле является идентификатором
+    private long id;
+
+    // Задает имя и некоторые свойства поля таблицы, на которое будет отображаться поле сущности
+    @Column(name = "name")
+    private String name;
+
+    //private Avatar avatar;
+    //private List<EMail> emails;
+    //private List<Course> courses;
+}
@@ -0,0 +1,20 @@
+spring:
+  datasource:
+    url: jdbc:h2:mem:testdb
+    initialization-mode: never
+
+  jpa:
+    generate-ddl: true
+    hibernate:
+      ddl-auto: create
+
+    properties:
+      hibernate:
+        format_sql: true
+
+    show-sql: true
+
+
+logging:
+  level:
+    ROOT: ERROR
@@ -0,0 +1,29 @@
+HELP.md
+/target/
+!.mvn/wrapper/maven-wrapper.jar
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+/build/
+
+### VS Code ###
+.vscode/
@@ -0,0 +1,57 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>2.7.6</version>
+        <relativePath/>
+    </parent>
+    <groupId>ru.otus.example</groupId>
+    <artifactId>orm-solution-03</artifactId>
+    <name>orm-solution-03</name>
+    <version>0.0.1-SNAPSHOT</version>
+
+    <properties>
+        <java.version>11</java.version>
+        <maven.compiler.source>11</maven.compiler.source>
+        <maven.compiler.target>11</maven.compiler.target>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-data-jpa</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>com.h2database</groupId>
+            <artifactId>h2</artifactId>
+            <version>2.1.214</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <optional>true</optional>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>
@@ -0,0 +1,17 @@
+package ru.otus.example.ormdemo;
+
+import org.h2.tools.Console;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+import java.sql.SQLException;
+
+@SpringBootApplication
+public class OrmDemoApplication {
+
+	public static void main(String[] args) throws SQLException {
+		SpringApplication.run(OrmDemoApplication.class, args);
+		//Console.main(args);
+	}
+
+}
@@ -0,0 +1,21 @@
+package ru.otus.example.ormdemo.models;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.*;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Entity
+@Table(name = "avatars")
+public class Avatar {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private long id;
+
+    @Column(name = "photo_url")
+    private String photoUrl;
+}
@@ -0,0 +1,21 @@
+package ru.otus.example.ormdemo.models;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.*;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Entity
+@Table(name = "courses")
+public class Course {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private long id;
+
+    @Column(name = "name")
+    private String name;
+}
@@ -0,0 +1,22 @@
+package ru.otus.example.ormdemo.models;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.*;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Entity
+@Table(name = "emails")
+public class EMail {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private long id;
+
+    @Column(name = "email")
+    private String email;
+}
@@ -0,0 +1,25 @@
+package ru.otus.example.ormdemo.models;
+
+import lombok.*;
+
+import javax.persistence.*;
+import java.util.List;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Entity // Указывает, что данный класс является сущностью
+@Table(name = "otus_students") // Задает имя таблицы, на которую будет отображаться сущность
+public class OtusStudent {
+    @Id // Позволяет указать какое поле является идентификатором
+    @GeneratedValue(strategy = GenerationType.IDENTITY) // Позволяет указать стратегию генерации id
+    private long id;
+
+    // Задает имя и некоторые свойства поля таблицы, на которое будет отображаться поле сущности
+    @Column(name = "name")
+    private String name;
+
+    //private Avatar avatar;
+    //private List<EMail> emails;
+    //private List<Course> courses;
+}
@@ -0,0 +1,20 @@
+spring:
+  datasource:
+    url: jdbc:h2:mem:testdb
+    initialization-mode: never
+
+  jpa:
+    generate-ddl: true
+    hibernate:
+      ddl-auto: create
+
+    properties:
+      hibernate:
+        format_sql: true
+
+    show-sql: true
+
+
+logging:
+  level:
+    ROOT: ERROR
@@ -0,0 +1,29 @@
+HELP.md
+/target/
+!.mvn/wrapper/maven-wrapper.jar
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+/build/
+
+### VS Code ###
+.vscode/
@@ -0,0 +1,58 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>2.7.6</version>
+        <relativePath/>
+    </parent>
+    <groupId>ru.otus.example</groupId>
+    <artifactId>orm-solution-04</artifactId>
+    <name>orm-solution-04</name>
+    <version>0.0.1-SNAPSHOT</version>
+
+    <properties>
+        <java.version>11</java.version>
+        <maven.compiler.source>11</maven.compiler.source>
+        <maven.compiler.target>11</maven.compiler.target>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-data-jpa</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>com.h2database</groupId>
+            <artifactId>h2</artifactId>
+            <version>2.1.214</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <optional>true</optional>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+
+
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>
@@ -0,0 +1,17 @@
+package ru.otus.example.ormdemo;
+
+import org.h2.tools.Console;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+import java.sql.SQLException;
+
+@SpringBootApplication
+public class OrmDemoApplication {
+
+	public static void main(String[] args) throws SQLException {
+		SpringApplication.run(OrmDemoApplication.class, args);
+		//Console.main(args);
+	}
+
+}
@@ -0,0 +1,21 @@
+package ru.otus.example.ormdemo.models;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.*;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Entity
+@Table(name = "avatars")
+public class Avatar {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private long id;
+
+    @Column(name = "photo_url")
+    private String photoUrl;
+}
@@ -0,0 +1,21 @@
+package ru.otus.example.ormdemo.models;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.*;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Entity
+@Table(name = "courses")
+public class Course {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private long id;
+
+    @Column(name = "name")
+    private String name;
+}
@@ -0,0 +1,22 @@
+package ru.otus.example.ormdemo.models;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.*;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Entity
+@Table(name = "emails")
+public class EMail {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private long id;
+
+    @Column(name = "email")
+    private String email;
+}
@@ -0,0 +1,30 @@
+package ru.otus.example.ormdemo.models;
+
+import lombok.*;
+
+import javax.persistence.*;
+import java.util.List;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Entity // Указывает, что данный класс является сущностью
+@Table(name = "otus_students") // Задает имя таблицы, на которую будет отображаться сущность
+public class OtusStudent {
+    @Id // Позволяет указать какое поле является идентификатором
+    @GeneratedValue(strategy = GenerationType.IDENTITY) // Стратегия генерации идентификаторов
+    private long id;
+
+    // Задает имя и некоторые свойства поля таблицы, на которое будет отображаться поле сущности
+    @Column(name = "name", nullable = false, unique = true)
+    private String name;
+
+    // Указывает на связь между таблицами "один к одному"
+    @OneToOne(cascade = CascadeType.ALL, fetch = FetchType.LAZY, orphanRemoval = true)
+    // Задает поле, по которому происходит объединение с таблицей для хранения связанной сущности
+    @JoinColumn(name = "avatar_id")
+    private Avatar avatar;
+
+    //private List<EMail> emails;
+    //private List<Course> courses;
+}
@@ -0,0 +1,20 @@
+spring:
+  datasource:
+    url: jdbc:h2:mem:testdb
+    initialization-mode: never
+
+  jpa:
+    generate-ddl: true
+    hibernate:
+      ddl-auto: create
+
+    properties:
+      hibernate:
+        format_sql: true
+
+    show-sql: true
+
+
+logging:
+  level:
+    ROOT: ERROR
@@ -0,0 +1,29 @@
+HELP.md
+/target/
+!.mvn/wrapper/maven-wrapper.jar
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+/build/
+
+### VS Code ###
+.vscode/
@@ -0,0 +1,58 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>2.7.6</version>
+        <relativePath/>
+    </parent>
+    <groupId>ru.otus.example</groupId>
+    <artifactId>orm-solution-05</artifactId>
+    <name>orm-solution-04</name>
+    <version>0.0.1-SNAPSHOT</version>
+
+    <properties>
+        <java.version>11</java.version>
+        <maven.compiler.source>11</maven.compiler.source>
+        <maven.compiler.target>11</maven.compiler.target>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-data-jpa</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>com.h2database</groupId>
+            <artifactId>h2</artifactId>
+            <version>2.1.214</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <optional>true</optional>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+
+
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>
@@ -0,0 +1,17 @@
+package ru.otus.example.ormdemo;
+
+import org.h2.tools.Console;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+import java.sql.SQLException;
+
+@SpringBootApplication
+public class OrmDemoApplication {
+
+	public static void main(String[] args) throws SQLException {
+		SpringApplication.run(OrmDemoApplication.class, args);
+		//Console.main(args);
+	}
+
+}
@@ -0,0 +1,24 @@
+package ru.otus.example.ormdemo.models;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.*;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Entity
+@Table(name = "avatars")
+public class Avatar {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private long id;
+
+    @Column(name = "photo_url")
+    private String photoUrl;
+
+    @OneToOne(fetch = FetchType.LAZY)
+    private OtusStudent student;
+}
@@ -0,0 +1,21 @@
+package ru.otus.example.ormdemo.models;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.*;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Entity
+@Table(name = "courses")
+public class Course {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private long id;
+
+    @Column(name = "name")
+    private String name;
+}
@@ -0,0 +1,22 @@
+package ru.otus.example.ormdemo.models;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.*;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Entity
+@Table(name = "emails")
+public class EMail {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private long id;
+
+    @Column(name = "email")
+    private String email;
+}
@@ -0,0 +1,28 @@
+package ru.otus.example.ormdemo.models;
+
+import lombok.*;
+
+import javax.persistence.*;
+import java.util.List;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Entity // Указывает, что данный класс является сущностью
+@Table(name = "otus_students") // Задает имя таблицы, на которую будет отображаться сущность
+public class OtusStudent {
+    @Id // Позволяет указать какое поле является идентификатором
+    @GeneratedValue(strategy = GenerationType.IDENTITY) // Стратегия генерации идентификаторов
+    private long id;
+
+    // Задает имя и некоторые свойства поля таблицы, на которое будет отображаться поле сущности
+    @Column(name = "name", nullable = false, unique = true)
+    private String name;
+
+    // Указывает на связь между таблицами "один к одному"
+    @OneToOne(cascade = CascadeType.ALL, fetch = FetchType.LAZY, orphanRemoval = true)
+    private Avatar avatar;
+
+    //private List<EMail> emails;
+    //private List<Course> courses;
+}
@@ -0,0 +1,20 @@
+spring:
+  datasource:
+    url: jdbc:h2:mem:testdb
+    initialization-mode: never
+
+  jpa:
+    generate-ddl: true
+    hibernate:
+      ddl-auto: create
+
+    properties:
+      hibernate:
+        format_sql: true
+
+    show-sql: true
+
+
+logging:
+  level:
+    ROOT: ERROR
@@ -0,0 +1,29 @@
+HELP.md
+/target/
+!.mvn/wrapper/maven-wrapper.jar
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+/build/
+
+### VS Code ###
+.vscode/
@@ -0,0 +1,58 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>2.7.6</version>
+        <relativePath/>
+    </parent>
+    <groupId>ru.otus.example</groupId>
+    <artifactId>orm-solution-06</artifactId>
+    <name>orm-solution-04</name>
+    <version>0.0.1-SNAPSHOT</version>
+
+    <properties>
+        <java.version>11</java.version>
+        <maven.compiler.source>11</maven.compiler.source>
+        <maven.compiler.target>11</maven.compiler.target>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-data-jpa</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>com.h2database</groupId>
+            <artifactId>h2</artifactId>
+            <version>2.1.214</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <optional>true</optional>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+
+
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>
@@ -0,0 +1,17 @@
+package ru.otus.example.ormdemo;
+
+import org.h2.tools.Console;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+import java.sql.SQLException;
+
+@SpringBootApplication
+public class OrmDemoApplication {
+
+	public static void main(String[] args) throws SQLException {
+		SpringApplication.run(OrmDemoApplication.class, args);
+		//Console.main(args);
+	}
+
+}
@@ -0,0 +1,24 @@
+package ru.otus.example.ormdemo.models;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.*;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Entity
+@Table(name = "avatars")
+public class Avatar {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private long id;
+
+    @Column(name = "photo_url")
+    private String photoUrl;
+
+    @OneToOne(fetch = FetchType.LAZY)
+    private OtusStudent student;
+}
@@ -0,0 +1,21 @@
+package ru.otus.example.ormdemo.models;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.*;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Entity
+@Table(name = "courses")
+public class Course {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private long id;
+
+    @Column(name = "name")
+    private String name;
+}
@@ -0,0 +1,22 @@
+package ru.otus.example.ormdemo.models;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.*;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Entity
+@Table(name = "emails")
+public class EMail {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private long id;
+
+    @Column(name = "email")
+    private String email;
+}
--- a/Show More
+++ b/Show More