praktikum6

spring/pom.xml

@@ -1,34 +1,40 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0"
+<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                              https://maven.apache.org/xsd/maven-4.0.0.xsd">
-         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
-                             https://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>3.3.5</version>
     <relativePath/>
   </parent>
-
   <groupId>de.componentware</groupId>
   <artifactId>spring-demo</artifactId>
   <version>1.0-SNAPSHOT</version>
   <name>spring-demo</name>
   <description>Spring Boot Demo – Componentware Übung 6</description>
-
   <properties>
     <java.version>21</java.version>
   </properties>
-
   <dependencies>
     <dependency>
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-web</artifactId>
     </dependency>
+    <dependency>
+      <groupId>org.springframework.boot</groupId>
+      <artifactId>spring-boot-starter-data-jpa</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>com.h2database</groupId>
+      <artifactId>h2</artifactId>
+      <scope>runtime</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.projectlombok</groupId>
+      <artifactId>lombok</artifactId>
+      <version>1.18.46</version>
+    </dependency>
   </dependencies>
-
   <build>
     <plugins>
       <plugin>

spring/src/main/java/org/example/demo/praktikum6/Auto.java

@@ -0,0 +1,20 @@
+package org.example.demo.praktikum6;
+
+import jakarta.persistence.*;
+import java.io.Serializable;
+
+@Entity
+public class Auto implements Serializable {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @Column(nullable = false)
+    public String hersteller;
+
+    @Column(nullable = false)
+    public String typ;
+
+    @Column(nullable = false)
+    public String kennzeichen;
+}

spring/src/main/java/org/example/demo/praktikum6/AutoDAO.java

@@ -0,0 +1,32 @@
+package org.example.demo.praktikum6;
+
+import jakarta.persistence.EntityManager;
+import jakarta.persistence.PersistenceContext;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Repository;
+import org.springframework.transaction.annotation.Transactional;
+
+@Repository
+public class AutoDAO {
+
+    @PersistenceContext
+    private EntityManager em;
+
+    @Autowired
+    private LogEntryDAO logEntryDAO;
+
+    @Transactional
+    public void createAuto(String hersteller, String typ, String kennzeichen) {
+        try {
+            Auto auto = new Auto();
+            auto.hersteller = hersteller;
+            auto.typ = typ;
+            auto.kennzeichen = kennzeichen;
+            em.persist(auto);
+            logEntryDAO.createLogEntry("Auto angelegt: " + hersteller + " " + typ + " (" + kennzeichen + ")");
+        } catch (Exception e) {
+            logEntryDAO.createLogEntry("Fehler beim Anlegen des Autos: " + e.getMessage());
+            throw e;
+        }
+    }
+}

spring/src/main/java/org/example/demo/praktikum6/LogEntry.java

@@ -0,0 +1,16 @@
+package org.example.demo.praktikum6;
+
+import jakarta.persistence.*;
+import java.time.LocalDateTime;
+import java.util.Date;
+
+@Entity
+public class LogEntry {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    public Date date;
+    public LocalDateTime time;
+    public String message;
+}

spring/src/main/java/org/example/demo/praktikum6/LogEntryDAO.java

@@ -0,0 +1,30 @@
+package org.example.demo.praktikum6;
+
+import jakarta.persistence.EntityManager;
+import jakarta.persistence.PersistenceContext;
+import org.springframework.stereotype.Repository;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.time.LocalDateTime;
+import java.util.Date;
+import java.util.List;
+
+@Repository
+public class LogEntryDAO {
+
+    @PersistenceContext
+    private EntityManager em;
+
+    @Transactional
+    public void createLogEntry(String message) {
+        LogEntry entry = new LogEntry();
+        entry.date = new Date();
+        entry.time = LocalDateTime.now();
+        entry.message = message;
+        em.persist(entry);
+    }
+
+    public List<LogEntry> getAllLogEntries() {
+        return em.createQuery("SELECT l FROM LogEntry l", LogEntry.class).getResultList();
+    }
+}

spring/src/main/java/org/example/demo/praktikum6/TestClient.java

@@ -0,0 +1,28 @@
+package org.example.demo.praktikum6;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.stereotype.Component;
+
+import java.util.List;
+
+@Component
+public class TestClient implements CommandLineRunner {
+
+    @Autowired
+    private AutoDAO autoDAO;
+
+    @Autowired
+    private LogEntryDAO logEntryDAO;
+
+    @Override
+    public void run(String... args) {
+        autoDAO.createAuto("BMW", "E32", "NE-IN 0000");
+
+        List<LogEntry> logs = logEntryDAO.getAllLogEntries();
+        System.out.println("=== Log-Einträge (" + logs.size() + ") ===");
+        for (LogEntry entry : logs) {
+            System.out.println("[" + entry.time + "] " + entry.message);
+        }
+    }
+}

spring/src/main/java/org/example/demo/uebung6/SpringDemoApplication.java

@@ -2,8 +2,10 @@ package org.example.demo.uebung6;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.autoconfigure.domain.EntityScan;
 
-@SpringBootApplication
+@SpringBootApplication(scanBasePackages = "org.example.demo")
+@EntityScan(basePackages = "org.example.demo")
 public class SpringDemoApplication {
 
     public static void main(String[] args) {

spring/src/main/resources/application.properties

@@ -1 +1,7 @@
 spring.application.name=spring-demo
+
+spring.datasource.url=jdbc:h2:mem:testdb
+spring.datasource.driver-class-name=org.h2.Driver
+spring.jpa.hibernate.ddl-auto=create-drop
+spring.jpa.show-sql=true
+spring.h2.console.enabled=true