JPA + Hibernate + Mysql的查詢語言問題

Question

我已經開發了一個Java獨立應用程序（java + hibernate），現在我將其移植到Java 8 + springboot + jpa + hibernate + mysql框架中。 我在舊項目中使用了HQL，但是在新框架中SQL語句似乎存在一些問題，例如，我必須將“ From p where id =（：parameter）”更改為“ Select * from p where id == ：parameter”通過移除支架。

豆角，扁豆

@Entity
public class Place extends Groupunit_Defined implements Interface_Entity
{
......
@ManyToOne(targetEntity=Place_Definer.class)
@JoinColumn(name="Groupunit_Definer",nullable=false)
private Place_Definer Groupunit_Definer;//
.....
}
@Entity
public class Place_Definer extends Groupunit_Definer
{
......
@Column(nullable=false,length=150)
private String Classification;
…….
}

@SuppressWarnings（“ unchecked”）public ArrayList Simply_get_thing_list（String Query_String，ArrayList Parameter_List，Thing_Class類）{查詢q = Entity_Manager.createNativeQuery（Query_String，Thing_Class）; ……。 返回Thing_List； }

SQL語句

"SELECT * FROM Place p WHERE p.Groupunit_Definer.Classification='Jurisdiction'"

HIBERNATE CONFIG

spring.jpa.database = MYSQL
spring.jpa.show-sql = true
spring.jpa.hibernate.ddl-auto = update
spring.jpa.hibernate.naming-strategy = org.hibernate.cfg.ImprovedNamingStrategy
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect

錯誤信息

:: Spring Boot ::       (v1.5.21.RELEASE)

2019-09-04 05:28:11.851  INFO 2508 --- [           main] c.s.mirrorworld.mirrorworldApplication   : Starting mirrorworldApplication on LAPTOP-FAS0SHLM with PID 2508 (C:\Users\yueho\eclipse-workspace\mirrorworld\target\classes started by yueho in C:\Users\yueho\eclipse-workspace\mirrorworld)
2019-09-04 05:28:11.859  INFO 2508 --- [           main] c.s.mirrorworld.mirrorworldApplication   : No active profile set, falling back to default profiles: default
2019-09-04 05:28:12.066  INFO 2508 --- [           main] s.c.a.AnnotationConfigApplicationContext : Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@2f217633: startup date [Wed Sep 04 05:28:12 CST 2019]; root of context hierarchy
2019-09-04 05:28:15.937  INFO 2508 --- [           main] j.LocalContainerEntityManagerFactoryBean : Building JPA container EntityManagerFactory for persistence unit 'default'
2019-09-04 05:28:15.994  INFO 2508 --- [           main] o.hibernate.jpa.internal.util.LogHelper  : HHH000204: Processing PersistenceUnitInfo [
    name: default
    ...]
2019-09-04 05:28:16.257  INFO 2508 --- [           main] org.hibernate.Version                    : HHH000412: Hibernate Core {5.0.12.Final}
2019-09-04 05:28:16.260  INFO 2508 --- [           main] org.hibernate.cfg.Environment            : HHH000206: hibernate.properties not found
2019-09-04 05:28:16.263  INFO 2508 --- [           main] org.hibernate.cfg.Environment            : HHH000021: Bytecode provider name : javassist
2019-09-04 05:28:16.559  INFO 2508 --- [           main] o.hibernate.annotations.common.Version   : HCANN000001: Hibernate Commons Annotations {5.0.1.Final}
2019-09-04 05:28:17.740  INFO 2508 --- [           main] org.hibernate.dialect.Dialect            : HHH000400: Using dialect: org.hibernate.dialect.MySQL5Dialect
2019-09-04 05:28:19.002  WARN 2508 --- [           main] o.h.b.i.SessionFactoryBuilderImpl        : Unrecognized hbm2ddl_auto value : update  .  Supported values include create, create-drop, update, and validate.  Ignoring
2019-09-04 05:28:20.031  INFO 2508 --- [           main] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default'
2019-09-04 05:28:24.577  INFO 2508 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Registering beans for JMX exposure on startup
2019-09-04 05:28:24.607  INFO 2508 --- [           main] c.s.mirrorworld.mirrorworldApplication   : Started mirrorworldApplication in 13.439 seconds (JVM running for 24.733)
2019-09-04 05:28:33.326  INFO 2508 --- [WT-EventQueue-0] o.h.h.i.QueryTranslatorFactoryInitiator  : HHH000397: Using ASTQueryTranslatorFactory
2019-09-04 05:28:33.844  WARN 2508 --- [WT-EventQueue-0] o.h.engine.jdbc.spi.SqlExceptionHelper   : SQL Error: 1054, SQLState: 42S22
2019-09-04 05:28:33.845 ERROR 2508 --- [WT-EventQueue-0] o.h.engine.jdbc.spi.SqlExceptionHelper   : Unknown column 'p.Groupunit_Definer.Classification' in 'where clause'
Exception in thread "AWT-EventQueue-0" javax.persistence.PersistenceException: org.hibernate.exception.SQLGrammarException: could not extract ResultSet
    at ……
org.springframework.orm.jpa.SharedEntityManagerCreator$DeferredQueryInvocationHandler.invoke(SharedEntityManagerCreator.java:375)
    at ……
Caused by: org.hibernate.exception.SQLGrammarException: could not extract ResultSet
    at …...
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown column 'p.Groupunit_Definer.Classification' in 'where clause'

Answer 1

通過將“ createNativeQuery”更改為“ createQuery”已解決了該問題，謝謝