Question

我正在使用MySQL DB开发Spring MVC应用程序。数据库中的两个表具有一对多的关系。

其中一个表是测验

@Entity
@Table(name="Quiz", schema = "QuizOwo")
public class QuizEntity
{
   @Id
   @GeneratedValue(strategy= GenerationType.IDENTITY)
   @Column(name = "idQuiz")
    private int idQuiz;

   @Column(name = "nameQuiz")
    private String nameQuiz;

   @Column(name = "descriptionQuiz")
    private String descriptionQuiz;

   @ManyToOne(optional=false)
   @JoinColumn(name = "idCategory")
    private CategoryQuizEntity categoryQuizEntity;

   @Column(name = "idPortal")
    private int idPortal;

另一张表是

@Entity
@Table(name="CategoryQuiz", schema = "QuizOwo")
public class CategoryQuizEntity
{
   @Id
   @GeneratedValue(strategy= GenerationType.IDENTITY)
   @Column(name = "idCategoryQuiz")
    private int idCategoryQuiz;

   @Column(name = "nameCategory")
    private String nameCategory;

   @OneToMany(mappedBy="categoryQuizEntity", targetEntity=QuizEntity.class, fetch=FetchType.LAZY)
   @LazyCollection(LazyCollectionOption.FALSE)
     private List<QuizEntity> quizEntities;

我的问题是，当发布一个SQL语句时（使用hibernate JPA），会抛出org.hibernate.exception.SQLGrammarException并显示此信息。

could not extract ResultSet; SQL [n/a]; nested exception is org.hibernate.exception.SQLGrammarException: could not extract ResultSet

¿为什么？

--- --- EDIT

我的mysql配置是

@Configuration
@EnableTransactionManagement
public class PersistenceConfig
{
    /** Bean para obtener el dataSource */
    @Bean(name = "dataSource")
    public DataSource getDataSource(){
       DataSource dataSource = createDataSource();
       return dataSource;
     }

    /** Generador del datasource */
    private DriverManagerDataSource createDataSource() {
        DriverManagerDataSource driverManagerDataSource = new DriverManagerDataSource();
        driverManagerDataSource.setDriverClassName(ConfigurationManager.getProperty(ConfigurationManager.DATABASE_DIVERCLASSNAME));
        driverManagerDataSource.setUrl(ConfigurationManager.getProperty(ConfigurationManager.DATABASE_URL));
        driverManagerDataSource.setUsername(ConfigurationManager.getProperty(ConfigurationManager.DATABASE_USERNAME));
        driverManagerDataSource.setPassword(ConfigurationManager.getProperty(ConfigurationManager.DATABASE_PASSWORD));
        driverManagerDataSource.setConnectionProperties(databaseProperties());
        return driverManagerDataSource;
    }

    @Bean
    public PersistenceExceptionTranslationPostProcessor exceptionTranslation() {
        return new PersistenceExceptionTranslationPostProcessor();
    }


    /** Generamos un entityManagerFactory con lo paquetes donde tiene que escanear para buscar a las entidades, el datasource
 * las propiedades de hibernate... */
    @Bean
    public LocalContainerEntityManagerFactoryBean entityManagerFactory() throws ClassNotFoundException, PropertyVetoException {
        LocalContainerEntityManagerFactoryBean emf = new LocalContainerEntityManagerFactoryBean();
        emf.setDataSource(createDataSource());
        emf.setPackagesToScan(new String[] { "com.owo.quiz.models" });
        JpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
        emf.setJpaVendorAdapter(vendorAdapter);
        emf.setJpaProperties(hibernateProperties());
        return emf;
    }

    /** Propiedades para hibernate/JPA */
    Properties hibernateProperties() {
        return new Properties() {
            {
                setProperty("hibernate.dialect", ConfigurationManager.getProperty(ConfigurationManager.HIBERNATE_DIALECT));
                setProperty("hibernate.globally_quoted_identifiers", "true");
            }
        };
    }

    /** Propiedades para la conexión con la base de datos */
    Properties databaseProperties() {
        return new Properties() {
            {
                setProperty("characterEncoding", "iso8859-1");
            }
        };
    }
}

===编辑====

SQL INSERT测验表是

CREATE TABLE Quiz ( idQuiz int(11) NOT NULL AUTO_INCREMENT, nameQuiz varchar(45) COLLATE latin1_spanish_ci DEFAULT NULL, descriptionQuiz text COLLATE latin1_spanish_ci, idCategory int(11) DEFAULT NULL, idPortal int(11) DEFAULT NULL, PRIMARY KEY (idQuiz), KEY fk_Quiz_1_idx (idCategory), CONSTRAINT fk_Quiz_1 FOREIGN KEY (idCategory) REFERENCES CategoryQuiz (idCategoryQuiz) ON DELETE NO ACTION ON UPDATE NO ACTION ) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=latin1 COLLATE=latin1_spanish_ci;

Answer 1

我重置了该用户的所有MySQL权限，并且它正常工作。

Answer 2

尝试将MySQL方言设置为连接属性的一部分。

hibernate.dialect=org.hibernate.dialect.MySQLDialect

Answer 3

如果您正在使用spring，spring boot，spring data，JPA和Hibernate，请尝试使用以下属性：

spring.jpa.properties.hibernate.globally_quoted_identifiers = true

如果仅使用休眠模式：

hibernate.globally_quoted_identifiers = true

JPA异常：org.hibernate.exception.SQLGrammarException

3 个答案: