@NotNull 注释不会转换为模式生成中的非空约束

Question

根据休眠验证程序参考文档 - 11.1.1 节。数据库模式级验证 (https://docs.jboss.org/hibernate/stable/validator/reference/en-US/html_single/#validator-checkconstraints-db),

Out of the box, Hibernate ORM will translate the constraints you have defined for your entities into mapping metadata. For example, if a property of your entity is annotated @NotNull, its columns will be declared as not null in the DDL schema generated by Hibernate ORM.

但是当我用@NotNull 注释我的字段时，我没有自动获得架构级别的约束。

我尝试将 Environment.HBM2DDL_AUTO 设置为 update 和 create，但两者都无法生成数据库约束。

即使休眠默认将 hibernate.validator.apply_to_ddl 设置为 true，我什至尝试手动设置 -

settings.put("hibernate.validator.apply_to_ddl", true);

但是 none 这些选项似乎对我有用。

我的域名class

package com.praveen.domain;

import javax.persistence.Entity;
import javax.validation.constraints.NotNull;

import lombok.Data;

@Entity
@Data
public class Stakeholder extends MyPersistent {

    @NotNull
    private String clientCode;

    @NotNull
    private String gender;
}

MyPersistentclass

package com.praveen.domain;

import java.io.Serializable;

import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.MappedSuperclass;

import lombok.Getter;
import lombok.Setter;

@MappedSuperclass
@Getter
@Setter
public class MyPersistent implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
}

我用来获取会话工厂的代码是

    private static SessionFactory getSessionFactory() {
        if (sessionFactory == null) {
            try {
                StandardServiceRegistryBuilder registryBuilder = new StandardServiceRegistryBuilder();

                Map<String, Object> settings = new HashMap<>();
                settings.put(Environment.DRIVER, Driver.class.getName());
                settings.put(Environment.URL, "jdbc:mysql://localhost:3306/hibernate_test?"
                        + "zeroDateTimeBehavior=CONVERT_TO_NULL&"
                        + "createDatabaseIfNotExist=true&"
                        + "useSSL=true&"
                        + "verifyServerCertificate=false&"
                        + "autoReconnect=true");
                settings.put(Environment.USER, "root");
                settings.put(Environment.PASS, "");
                settings.put(Environment.DIALECT, MySQL55Dialect.class);
                settings.put(Environment.HBM2DDL_AUTO, "update");
                settings.put(Environment.SHOW_SQL, false);

                // HikariCP settings
                settings.put("hibernate.hikari.connectionTimeout", "20000");
                settings.put("hibernate.hikari.minimumIdle", "5");
                settings.put("hibernate.hikari.maximumPoolSize", "20");
                settings.put("hibernate.hikari.idleTimeout", "300000");

                registryBuilder.applySettings(settings);
                registry = registryBuilder.build();
                MetadataSources sources = new MetadataSources(registry);
                sources.addAnnotatedClass(Stakeholder.class);

                Metadata metadata = sources.getMetadataBuilder().build();
                sessionFactory = metadata.getSessionFactoryBuilder().build();
            } catch (Exception e) {
                e.printStackTrace();
                shutdown();
            }
        }
        return sessionFactory;
    }

Answer 1

你应该使用 @Column(nullable = false)

@NotNull 用于 Bean 验证，而不是模式约束，如果您使用的是旧版本的 hibernate @NotNull 将不会被转换为列约束

Answer 2

我犯了一个愚蠢的错误，因为我没有在 pom.xml 中包含 javax.el 依赖项及其实现。

有趣的是，那时我没有收到 java.lang.NoClassDefFoundError: javax/el/ELManager 错误，因为我没有编写任何代码来通过 Validation.buildDefaultValidatorFactory() 初始化 ValidatorFactory。

当我编写代码并使用 ValidatorFactory 时，我得到了 NoClassDefFoundError 并发现我缺少 javax.el 依赖项。

所以最后我能够通过添加以下依赖项来解决 NoClassDefFoundError 错误以及模式生成中数据库约束的验证注释的非翻译问题。

    <dependency>
        <groupId>javax.el</groupId>
        <artifactId>javax.el-api</artifactId>
        <version>3.0.0</version>
    </dependency>

    <dependency>
        <groupId>org.glassfish</groupId>
        <artifactId>javax.el</artifactId>
        <version>3.0.0</version>
    </dependency>

@NotNull 注释不会转换为模式生成中的非空约束

@NotNull annotation does not translate to not null constraint in schema generation

java

hibernate

hibernate-validator

hibernate-5.x

mysql-5.5