From 8595331a1dbdb3afcc37211b6a6157f7621f8031 Mon Sep 17 00:00:00 2001
From: ArtemEmelyanov <artem_emelyanov_2003@list.ru>
Date: Fri, 14 Apr 2023 22:00:27 +0400
Subject: [PATCH] =?UTF-8?q?=D0=BE=D0=BA?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 data.mv.db                                    | Bin 32768 -> 32768 bytes
 .../IP/University/Service/GroupService.java   |   4 ++
 .../IP/University/Service/StudentService.java |  61 ++++++++++++++++++
 3 files changed, 65 insertions(+)
 create mode 100644 src/main/java/ru/IP_LabWorks/IP/University/Service/GroupService.java

diff --git a/data.mv.db b/data.mv.db
index da09d65c69633a60614dcdd7e82da47172c3e16d..faae2b61e1ce1be82a660c235403f6c21803587a 100644
GIT binary patch
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diff --git a/src/main/java/ru/IP_LabWorks/IP/University/Service/GroupService.java b/src/main/java/ru/IP_LabWorks/IP/University/Service/GroupService.java
new file mode 100644
index 0000000..fc8a8eb
--- /dev/null
+++ b/src/main/java/ru/IP_LabWorks/IP/University/Service/GroupService.java
@@ -0,0 +1,4 @@
+package ru.IP_LabWorks.IP.University.Service;
+
+public class GroupService {
+}
diff --git a/src/main/java/ru/IP_LabWorks/IP/University/Service/StudentService.java b/src/main/java/ru/IP_LabWorks/IP/University/Service/StudentService.java
index 65f6b5a..6fbe9fd 100644
--- a/src/main/java/ru/IP_LabWorks/IP/University/Service/StudentService.java
+++ b/src/main/java/ru/IP_LabWorks/IP/University/Service/StudentService.java
@@ -1,4 +1,65 @@
 package ru.IP_LabWorks.IP.University.Service;
 
+import jakarta.persistence.Entity;
+import jakarta.persistence.EntityManager;
+import jakarta.persistence.EntityNotFoundException;
+import jakarta.persistence.PersistenceContext;
+import org.springframework.transaction.annotation.Transactional;
+import org.springframework.stereotype.Service;
+import org.springframework.util.StringUtils;
+import ru.IP_LabWorks.IP.University.Model.Student;
+
+import java.util.List;
+
+@Service
 public class StudentService {
+    @PersistenceContext
+    private EntityManager em;
+
+    @Transactional
+    public Student addStudent(String name, Integer age){
+        if (!StringUtils.hasText(name) || !StringUtils.hasText(String.valueOf(age))) {
+            throw new IllegalArgumentException("Student name or age is null or empty");
+        }
+        final Student student = new Student(name, age);
+        em.persist(student);
+        return student;
+    }
+
+    @Transactional(readOnly  = true)
+    public Student findStudent(Long id) {
+        final Student student = em.find(Student.class, id);
+        if (student == null) {
+            throw new EntityNotFoundException(String.format("Student with id [%s] is not found", id));
+        }
+        return student;
+    }
+
+    @Transactional(readOnly = true)
+    public List<Student> findAllStudents() {
+        return em.createQuery("select s from Student s", Student.class).getResultList();
+    }
+
+    @Transactional
+    public Student updateStudent(Long id, String name, Integer age) {
+        if (!StringUtils.hasText(name) || !StringUtils.hasText(String.valueOf(age))) {
+            throw new IllegalArgumentException("Student name or age is null or empty");
+        }
+        final Student currentStudent = findStudent(id);
+        currentStudent.setName(name);
+        currentStudent.setAge(age);
+        return em.merge(currentStudent);
+    }
+
+    @Transactional
+    public Student deleteStudent(Long id) {
+        final Student currentStudent = findStudent(id);
+        em.remove(currentStudent);
+        return currentStudent;
+    }
+
+    @Transactional
+    public void deleteAllStudent() {
+        em.createQuery("delete from Student").executeUpdate();
+    }
 }