java - 使用 hibernate 以编程方式验证架构

Question

在大多数项目中，使用模式验证运行 java 应用程序 的方式是使用该配置(使用 spring 时):

spring.jpa.hibernate.ddl-auto=validate

我遇到了一个问题，我需要在运行期间的特定时间验证我的模式，有什么方法可以实现吗？

我看到 hibernate 使用 AbstractSchemaValidator 管理它,我正在使用 spring 和 hibernate，但我没有找到任何如何处理它的信息，
我唯一找到的是 How to validate database schema programmatically in hibernate with annotations? , 但它在旧版本的 spring-boot

中被删除

<dependency>
    <groupId>org.springframework.data</groupId>
    <artifactId>spring-data-jpa</artifactId>
    <version>2.0.4.RELEASE</version>
</dependency>

有什么想法吗？

Answer 1

这是解决方案，如果您的用例需要:

• 对模式的哪一部分应该进行精细和明确的控制验证
• 需要验证多个模式
• 需要验证服务未使用的架构，计划的 validator 正在运行
• 应用程序使用的数据库连接不应以任何方式受到验证的影响(意思是，您不想从主连接池借用连接)

如果以上适用于您的需求，那么这是如何进行计划模式验证的示例:

1. 来源

@SpringBootApplication
@EnableScheduling
@EnableConfigurationProperties(ScheamValidatorProperties.class)
public class SchemaValidatorApplication {
     public static void main(String[] args) {
       SpringApplication.run(SchemaValidatorApplication.class, args);
    }
}

@ConfigurationProperties("schema-validator")
class ScheamValidatorProperties {
    public Map<String, String> settings = new HashMap<>();

    public ScheamValidatorProperties() {
    }

    public Map<String, String> getSettings() { 
        return this.settings;
    }

    public void setSome(Map<String, String> settings) { 
        this.settings = settings;
    }
}

@Component
class ScheduledSchemaValidator {

    private ScheamValidatorProperties props;

    public ScheduledSchemaValidator(ScheamValidatorProperties props) {
        this.props = props;
    }

    @Scheduled(cron = "0 0/1 * * * ?")
    public void validateSchema() {
        StandardServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder()
            .applySettings(props.getSettings())
            .build();

        Metadata metadata = new MetadataSources(serviceRegistry)
            .addAnnotatedClass(Entity1.class)
            .addAnnotatedClass(Entity2.class)
            .buildMetadata();

        try {
            new SchemaValidator().validate(metadata, serviceRegistry);
        } catch (Exception e) {
            System.out.println("Validation failed: " + e.getMessage());
        } finally {
            StandardServiceRegistryBuilder.destroy(serviceRegistry);
        }
    }
}

@Entity
@Table(name = "table1")
class Entity1 {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    Entity1() {}

    public Long getId() {
        return id;
    }

}

@Entity
@Table(name = "table2")
class Entity2 {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    Entity2() {}

    public Long getId() {
        return id;
    }
}

1. schema.sql

CREATE DATABASE IF NOT EXISTS testdb;

CREATE TABLE IF NOT EXISTS `table1` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  PRIMARY KEY (`id`)
);

CREATE TABLE IF NOT EXISTS `table2` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  PRIMARY KEY (`id`)
);

1. application.yml

spring:
  cache:
    type: none
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3309/testdb?useSSL=false&nullNamePatternMatchesAll=true&serverTimezone=UTC&allowPublicKeyRetrieval=true
    username: test_user
    password: test_password
    testWhileIdle: true
    validationQuery: SELECT 1
  jpa:
    show-sql: false
    database-platform: org.hibernate.dialect.MySQL8Dialect
    hibernate:
      ddl-auto: none
      naming:
        physical-strategy: org.springframework.boot.orm.jpa.hibernate.SpringPhysicalNamingStrategy
        implicit-strategy: org.springframework.boot.orm.jpa.hibernate.SpringImplicitNamingStrategy
    properties:
      hibernate.dialect: org.hibernate.dialect.MySQL8Dialect
      hibernate.cache.use_second_level_cache: false
      hibernate.cache.use_query_cache: false
      hibernate.generate_statistics: false
      hibernate.hbm2ddl.auto: validate

schema-validator:
    settings:
        connection.driver_class: com.mysql.cj.jdbc.Driver
        hibernate.dialect: org.hibernate.dialect.MySQL8Dialect
        hibernate.connection.url: jdbc:mysql://localhost:3309/testdb?autoReconnect=true&useSSL=false&allowPublicKeyRetrieval=true
        hibernate.connection.username: test_user
        hibernate.connection.password: test_password
        hibernate.default_schema: testdb

1. docker-compose.yml

version: '3.0'

services:
  db:
    image: mysql:8.0.14
    restart: always
    ports:
     - 3309:3306
    environment:
      MYSQL_ROOT_PASSWORD: test_password
      MYSQL_DATABASE: testdb
      MYSQL_USER: test_user
      MYSQL_PASSWORD: test_password