Spring Data JPA 使用

Spring Data JPA

build.gradle

plugins {  
    id 'org.springframework.boot' version '2.7.0'  
    id 'io.spring.dependency-management' version '1.0.11.RELEASE'  
    id 'java'  
}  
  
group = 'com.insight.into.life'  
version = '0.0.1-SNAPSHOT'  
sourceCompatibility = '17'  
  
configurations {  
    compileOnly {  
        extendsFrom annotationProcessor  
    }  
}  
  
repositories {  
    mavenCentral()  
}  
  
dependencies {  
    implementation 'org.springframework.boot:spring-boot-starter-web'   
    implementation 'org.springframework.boot:spring-boot-starter-data-jpa'  
    implementation 'org.springframework.boot:spring-boot-starter-actuator'  
  
    compileOnly 'org.projectlombok:lombok'  
    developmentOnly 'org.springframework.boot:spring-boot-devtools'  
    runtimeOnly 'mysql:mysql-connector-java'  
  
    annotationProcessor 'org.springframework.boot:spring-boot-configuration-processor'  
    annotationProcessor 'org.projectlombok:lombok'  
  
    testImplementation 'org.springframework.boot:spring-boot-starter-test'  
    testImplementation 'org.springframework.security:spring-security-test'  
}  
  
tasks.named('test') {  
    useJUnitPlatform()  
}

添加

• org.springframework.boot:spring-boot-starter-web
• org.springframework.boot:spring-boot-starter-data-jpa
• mysql:mysql-connector-java

application.yml

server:  
  port: 9000  
  
logging:  
  level:  
    org.springframework.security: info  
  
spring:  
  datasource:  
    driver-class-name: com.mysql.cj.jdbc.Driver  
    url: jdbc:mysql://localhost:3306/auth-center?useUnicode=true&characterEncoding=utf8&allowPublicKeyRetrieval=true&useSSL=false&serverTimezone=Asia/Shanghai  
    username: root  
    password: 123456  
  jpa:  
    hibernate:  
      ddl-auto: update

spring.jpa.hibernate.ddl-auto 的参数可选项有

• none：使用 mysql 数据库时，默认值为 none，对数据库表不会产生任何影响
• update：Hibernate 根据实体变更表结构
• create：每次都会重新创建表，但是应用程序关闭时，不会删除表
• create-drop：创建表，应用程序关闭时，删除表。使用内存数据库，比如 H2 时，默认此选项

使用 mysql 在生产环境中，将 `spring.jpa.hibernate.ddl-auto` 设置为 `none` 是比较好的选择。

实体

package com.insight.into.life.auth.center.domain;  
  
import lombok.Getter;  
import lombok.RequiredArgsConstructor;  
import lombok.Setter;  
import lombok.ToString;  
import org.springframework.security.core.GrantedAuthority;  
import org.springframework.security.core.userdetails.UserDetails;  
  
import javax.persistence.Column;  
import javax.persistence.Entity;  
import javax.persistence.Id;  
import java.time.LocalDateTime;  
import java.util.ArrayList;  
import java.util.Collection;  
  
/**  
 * @author Zhang_Xiang  
 * @since 2022/5/16 15:17:25  
 */@Entity  
@Getter  
@Setter  
@ToString  
@RequiredArgsConstructor  
public class Member implements UserDetails {  
  
    @Id  
    @Column(name = "id", nullable = false)  
    private Long id;  
  
    private String loginAccount;  
  
    private String password;  
  
    private LocalDateTime lastLoginTime;  
  
  
    @Override  
    public Collection<? extends GrantedAuthority> getAuthorities() {  
        return new ArrayList<>() {  
            {  
                add(() -> "read");  
                add(() -> "write");  
            }  
        };  
    }  
  
    @Override  
    public String getPassword() {  
        return password;  
    }  
  
    @Override  
    public String getUsername() {  
        return loginAccount;  
    }  
  
    @Override  
    public boolean isAccountNonExpired() {  
        return true;  
    }  
  
    @Override  
    public boolean isAccountNonLocked() {  
        return true;  
    }  
  
    @Override  
    public boolean isCredentialsNonExpired() {  
        return true;  
    }  
  
    @Override  
    public boolean isEnabled() {  
        return true;  
    }  
}

Repository

创建自定义仓储

package com.insight.into.life.auth.center.repository;  
  
import com.insight.into.life.auth.center.domain.Member;  
import org.springframework.data.repository.CrudRepository;  
  
import java.util.Optional;  
  
/**  
 * @author Zhang_Xiang  
 * @since 2022/5/20 15:36:41  
 */public interface MbrRepository extends CrudRepository<Member, Long> {  
  
    Optional<Member> findByLoginAccount(String loginAccount);  
}