[A] JPA代码提交

pom.xml

@@ -45,6 +45,12 @@
             <artifactId>spring-boot-starter-data-jpa</artifactId>
         </dependency>
 
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-devtools</artifactId>
+            <optional>true</optional>
+        </dependency>
+
         <!-- MySQL连接 -->
         <dependency>
             <groupId>mysql</groupId>

src/main/java/com/lsqingfeng/springboot/SpringBootLearningApplication.java

@@ -2,6 +2,7 @@ package com.lsqingfeng.springboot;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.data.jpa.repository.config.EnableJpaAuditing;
 
 /**
  * @className: SpringBootLearningApplication
@@ -10,6 +11,7 @@ import org.springframework.boot.autoconfigure.SpringBootApplication;
  * @date: 2022-01-10 14:36
  */
 @SpringBootApplication
+@EnableJpaAuditing
 public class SpringBootLearningApplication {
     public static void main(String[] args) {
         SpringApplication.run(SpringBootLearningApplication.class, args);

src/main/java/com/lsqingfeng/springboot/controller/JdbcController.java

@@ -13,7 +13,7 @@ import org.springframework.web.bind.annotation.*;
  * @date: 2022-01-17 13:58
  */
 @RestController
-@RequestMapping("jdbc")
+@RequestMapping("jpa")
 public class JdbcController {
 
     /**
@@ -55,4 +55,9 @@ public class JdbcController {
         userService.delete(id);
         return Result.success();
     }
+
+    @GetMapping("getByName")
+    public Result getByName(String name){
+        return Result.success(userService.getByName(name));
+    }
 }

src/main/java/com/lsqingfeng/springboot/dao/UserDao.java

@@ -2,8 +2,18 @@ package com.lsqingfeng.springboot.dao;
 
 import com.lsqingfeng.springboot.entity.User;
 import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
 
 import java.io.Serializable;
 
 public interface UserDao extends JpaRepository<User,Integer>, Serializable {
+
+    /**
+     *
+     * @param name
+     * @return
+     */
+    @Query("select u from User u where u.name = ?1")
+    User getByName(String name);
+
 }

src/main/java/com/lsqingfeng/springboot/entity/User.java

 package com.lsqingfeng.springboot.entity;
 
 import lombok.Data;
+import org.springframework.data.annotation.CreatedDate;
+import org.springframework.data.annotation.LastModifiedDate;
 
+import javax.persistence.*;
 import java.util.Date;
 
 /**
@@ -11,8 +14,15 @@ import java.util.Date;
  * @date: 2022-01-14 16:35
  */
 @Data
+@Entity
+@Table(name = "t_user")
 public class User {
 
+    /**
+     * 主键生成策略： 自增
+     */
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Integer id;
 
     private String name;
@@ -21,8 +31,14 @@ public class User {
 
     private String address;
 
+    @CreatedDate
+    @Column(name="create_time")
+    @Temporal(TemporalType.TIMESTAMP)
     private Date createTime;
 
+    @LastModifiedDate
+    @Column(name="update_time")
+    @Temporal(TemporalType.TIMESTAMP)
     private Date updateTime;
 
 }

src/main/java/com/lsqingfeng/springboot/service/UserService.java

@@ -46,5 +46,12 @@ public interface UserService {
      */
     int delete(Integer id);
 
+    /**
+     * 根据名字查询
+     * @param name
+     * @return
+     */
+    User getByName(String name);
+
 
 }

src/main/java/com/lsqingfeng/springboot/service/impl/UserServiceImpl.java

@@ -53,4 +53,10 @@ public class UserServiceImpl implements UserService {
         userDao.delete(user);
         return id;
     }
+
+    @Override
+    public User getByName(String name) {
+        return userDao.getByName(name);
+    }
+
 }

src/main/resources/application.yml

@@ -10,15 +10,16 @@ spring:
   jpa:
     show-sql: true # 默认false，在日志里显示执行的sql语句
     database: mysql
-      hibernate.ddl-auto: update #指定为update，每次启动项目检测表结构有变化的时候会新增字段，表不存在时会 新建，如果指定create，则每次启动项目都会清空数据并删除表，再新建
-      properties.hibernate.dialect: org.hibernate.dialect.MySQL5Dialect # 使用JPA创建表时，默认使用的存储引擎是MyISAM，通过指定数据库版本，可以使用InnoDB
-      database-platform: org.hibernate.dialect.MySQL5Dialect
-      hibernate:
-        naming:
-          #指定jpa的自动表生成策略，驼峰自动映射为下划线格式
-          implicit-strategy: org.hibernate.boot.model.naming.ImplicitNamingStrategyLegacyJpaImpl
-          #physical-strategy: org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl
-
+    database-platform: org.hibernate.dialect.MySQL5Dialect
+    hibernate:
+      ddl-auto: update #指定为update，每次启动项目检测表结构有变化的时候会新增字段，表不存在时会 新建，如果指定create，则每次启动项目都会清空数据并删除表，再新建
+      naming:
+        #指定jpa的自动表生成策略，驼峰自动映射为下划线格式7
+        implicit-strategy: org.hibernate.boot.model.naming.ImplicitNamingStrategyLegacyJpaImpl
+        #physical-strategy: org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl
+  devtools:
+    restart:
+      enable: true
 third:
   weather:
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