example

examples/chapter06/spring-boot-jpa-demo/src/main/java/com/lk/demo/MyWebApplication.java

@@ -1,8 +1,6 @@
 package com.lk.demo;
 
 import org.springframework.boot.SpringApplication;
-import org.springframework.boot.autoconfigure.AutoConfiguration;
-import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 
 

examples/chapter06/spring-boot-jpa-demo/src/main/java/com/lk/demo/User.java

@@ -1,11 +1,27 @@
 package com.lk.demo;
 
+import jakarta.persistence.*;
+
+@Entity
+@Table(name = "users")
 public class User {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;
+
+    @Column(nullable = false)
     private String name;
+
+    @Column(nullable = false)
     private String password;
+
+    @Column()
     private String email;
+
+    @Column
     private String phone;
+
+    @Column
     private Integer age;
 
     public String getName() {

examples/chapter06/spring-boot-jpa-demo/src/main/java/com/lk/demo/UserController.java

@@ -87,6 +87,6 @@ public class UserController {
     @DeleteMapping("/{id}")
     public String deleteUser(@PathVariable Long id){
         System.out.println("delete id: "+id);
-        return "ok";
+        return userService.delete(id);
     }
 }

examples/chapter06/spring-boot-jpa-demo/src/main/java/com/lk/demo/UserRepository.java

@@ -0,0 +1,6 @@
+package com.lk.demo;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface UserRepository extends JpaRepository<User, Long> {
+}

examples/chapter06/spring-boot-jpa-demo/src/main/java/com/lk/demo/UserService.java

@@ -1,5 +1,6 @@
 package com.lk.demo;
 
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
 import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.RequestBody;
@@ -10,39 +11,38 @@ import java.util.List;
 @Service
 public class UserService {
 
+    @Autowired
+    UserRepository userRepository;
+
     public User getUser(Long id){
-        User user = new User();
-        user.setId(id);
-        user.setName("lk");
-        user.setAge(18);
-        return user;
+        return userRepository.findById(id).orElse(null);
     }
 
 
     public List<User> queryUsers(){
-       List<User> users = new ArrayList<>();
-       User u1 = new User();
-       u1.setName("John");
-       u1.setEmail("john@gmail.com");
-       u1.setPhone("123456789");
-       users.add(u1);
-       User u2 = new User();
-       u2.setName("Mike");
-       u2.setEmail("mike@gmail.com");
-       u2.setPhone("123456789");
-       users.add(u2);
-       return users;
+       return userRepository.findAll();
     }
 
 
     public User createUser(User user){
-        user.setId(22L);
-        return user;
+        return userRepository.save(user);
     }
 
     public User updateUser(Long id, User user){
-        user.setId(id);
-        return user;
+        userRepository.findById(id).ifPresent(u->{
+//            u.setName(user.getName());
+            u.setPassword(user.getPassword());
+            u.setEmail(user.getEmail());
+            u.setPhone(user.getPhone());
+            u.setAge(user.getAge());
+            userRepository.save(u);
+        });
+        return userRepository.findById(id).orElse(null);
+    }
+
+    public String delete(Long id){
+        userRepository.deleteById(id);
+        return "ok";
     }
 
 }

examples/chapter06/spring-boot-jpa-demo/src/main/resources/application.yml

@@ -2,7 +2,7 @@ spring:
   jackson:
     property-naming-strategy: SNAKE_CASE # 驼峰转下划线
   datasource:
-    url: jdbc:mysql://localhost:3306/paopao?useSSL=false&serverTimezone=UTC&allowPublicKeyRetrieval=true # MySQL连接URL，paopao是数据库名
+    url: jdbc:mysql://localhost:3306/demo?useSSL=false&serverTimezone=UTC&allowPublicKeyRetrieval=true # MySQL连接URL，paopao是数据库名
     driverClassName: com.mysql.cj.jdbc.Driver # MySQL的Driver类名
     username: root # MySQL用户名
     password: root # MySQL密码
@@ -13,4 +13,30 @@ spring:
     database-platform: org.hibernate.dialect.MySQL8Dialect # 修改为MySQL的Dialect
     hibernate:
       ddl-auto: update # 根据需要调整，update适用于开发和某些生产环境
-      format_sql: true # 保持原样，用于格式化SQL输出
+      format_sql: true # 保持原样，用于格式化SQL输出
+
+#
+#spring:
+#
+#  jackson:
+#    property-naming-strategy: SNAKE_CASE # 驼峰转下划线
+#
+#  datasource:
+#    url: jdbc:h2:file:./demo.h2 # 使用文件存储
+#    driverClassName: org.h2.Driver
+#    username: root
+#    password: root
+#  h2:
+#    console: # 开启console访问 默认false
+#      enabled: true
+#      settings:
+#        trace: true # 开启h2 console 跟踪 方便调试  默认 false
+#        web-allow-others: true # 允许console 远程访问 默认false
+#      path: /h2 #  h2 访问路径上下文
+#  jpa:
+#    show-sql: true
+#    open-in-view: false
+#    defer-datasource-initialization: true
+#    database-platform: org.hibernate.dialect.H2Dialect
+#    hibernate:
+#      ddl-auto: update