我是JPA的新手，现在我正在尝试理解标准示例，我在线阅读并看到了一些stackoverflow问题，我在所有这些问题中发现的是以下语句将允许hibernate在运行时创建表-time。
hibernate.hbm2ddl.auto=create
但是每当我在mysql数据库中运行没有表的代码时，它都会抛出以下错误：
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v1.1.4.RELEASE)
2014-07-24 09:44:25.365 INFO 8496 --- [ main] o.s.d.j.e.r.simple.SimpleConfiguration : Starting SimpleConfiguration on harmathu-WS with PID 8496 (C:\Songs\spring-data-jpa-examples\spring-data-jpa-example\target\classes started by harmathu in C:\Songs\spring-data-jpa-examples\spring-data-jpa-example)
2014-07-24 09:44:25.421 INFO 8496 --- [ main] s.c.a.AnnotationConfigApplicationContext : Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@429bd883: startup date [Thu Jul 24 09:44:25 IST 2014]; root of context hierarchy
2014-07-24 09:44:26.722 INFO 8496 --- [ main] j.LocalContainerEntityManagerFactoryBean : Building JPA container EntityManagerFactory for persistence unit 'default'
2014-07-24 09:44:26.747 INFO 8496 --- [ main] o.hibernate.jpa.internal.util.LogHelper : HHH000204: Processing PersistenceUnitInfo [
name: default
...]
2014-07-24 09:44:26.831 INFO 8496 --- [ main] org.hibernate.Version : HHH000412: Hibernate Core {4.3.5.Final}
2014-07-24 09:44:26.834 INFO 8496 --- [ main] org.hibernate.cfg.Environment : HHH000206: hibernate.properties not found
2014-07-24 09:44:26.836 INFO 8496 --- [ main] org.hibernate.cfg.Environment : HHH000021: Bytecode provider name : javassist
2014-07-24 09:44:27.172 INFO 8496 --- [ main] o.hibernate.annotations.common.Version : HCANN000001: Hibernate Commons Annotations {4.0.4.Final}
2014-07-24 09:44:27.390 INFO 8496 --- [ main] org.hibernate.dialect.Dialect : HHH000400: Using dialect: org.hibernate.dialect.MySQL5Dialect
2014-07-24 09:44:27.571 INFO 8496 --- [ main] o.h.h.i.ast.ASTQueryTranslatorFactory : HHH000397: Using ASTQueryTranslatorFactory
2014-07-24 09:44:28.392 WARN 8496 --- [ main] o.h.hql.internal.ast.HqlSqlWalker : [DEPRECATION] Encountered positional parameter near line 1, column 97. Positional parameter are considered deprecated; use named parameters or JPA-style positional parameters instead.
2014-07-24 09:44:28.567 INFO 8496 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
2014-07-24 09:44:28.591 INFO 8496 --- [ main] o.s.d.j.e.r.simple.SimpleConfiguration : Started SimpleConfiguration in 3.611 seconds (JVM running for 4.607)
2014-07-24 09:44:28.658 WARN 8496 --- [ main] o.h.engine.jdbc.spi.SqlExceptionHelper : SQL Error: 1146, SQLState: 42S02
2014-07-24 09:44:28.659 ERROR 8496 --- [ main] o.h.engine.jdbc.spi.SqlExceptionHelper : Table 'test_auditor.app_user' doesn't exist
Exception in thread "main" org.springframework.dao.InvalidDataAccessResourceUsageException: could not execute statement; SQL [n/a]; nested exception is org.hibernate.exception.SQLGrammarException: could not execute statement
at org.springframework.orm.jpa.vendor.HibernateJpaDialect.convertHibernateAccessException(HibernateJpaDialect.java:172)
at org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:155)
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.translateExceptionIfPossible(AbstractEntityManagerFactoryBean.java:417)
at org.springframework.dao.support.ChainedPersistenceExceptionTranslator.translateExceptionIfPossible(ChainedPersistenceExceptionTranslator.java:59)
at org.springframework.dao.support.DataAccessUtils.translateIfNecessary(DataAccessUtils.java:213)
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:147)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodIntercceptor.invoke(CrudMethodMetadataPostProcessor.java:111)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)
at com.sun.proxy.$Proxy56.save(Unknown Source)
at org.springframework.data.jpa.example.repository.simple.SimpleConfiguration.main(SimpleConfiguration.java:45)
Caused by: org.hibernate.exception.SQLGrammarException: could not execute statement
at org.hibernate.exception.internal.SQLExceptionTypeDelegate.convert(SQLExceptionTypeDelegate.java:80)
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:49)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:126)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:112)
at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:190)
at org.hibernate.id.IdentityGenerator$GetGeneratedKeysDelegate.executeAndExtract(IdentityGenerator.java:96)
at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:58)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3032)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3558)
at org.hibernate.action.internal.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:98)
at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:490)
at org.hibernate.engine.spi.ActionQueue.addResolvedEntityInsertAction(ActionQueue.java:195)
at org.hibernate.engine.spi.ActionQueue.addInsertAction(ActionQueue.java:179)
at org.hibernate.engine.spi.ActionQueue.addAction(ActionQueue.java:214)
at org.hibernate.event.internal.AbstractSaveEventListener.addInsertAction(AbstractSaveEventListener.java:324)
at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:288)
at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:194)
at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:125)
at org.hibernate.jpa.event.internal.core.JpaPersistEventListener.saveWithGeneratedId(JpaPersistEventListener.java:84)
at org.hibernate.event.internal.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:206)
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:149)
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:75)
at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:811)
at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:784)
at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:789)
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:1181)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:289)
at com.sun.proxy.$Proxy49.persist(Unknown Source)
at org.springframework.data.jpa.repository.support.SimpleJpaRepository.save(SimpleJpaRepository.java:389)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.executeMethodOn(RepositoryFactorySupport.java:405)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:390)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:344)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:98)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:262)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:95)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:136)
... 8 more
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table 'test_auditor.app_user' doesn't exist
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:408)
at com.mysql.jdbc.Util.getInstance(Util.java:383)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1062)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4226)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4158)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2615)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2776)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2840)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2082)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2334)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2262)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2246)
at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:187)
... 49 more
2014-07-24 09:44:28.674 INFO 8496 --- [ Thread-1] s.c.a.AnnotationConfigApplicationContext : Closing org.springframework.context.annotation.AnnotationConfigApplicationContext@429bd883: startup date [Thu Jul 24 09:44:25 IST 2014]; root of context hierarchy
2014-07-24 09:44:28.676 INFO 8496 --- [ Thread-1] o.s.j.e.a.AnnotationMBeanExporter : Unregistering JMX-exposed beans on shutdown
2014-07-24 09:44:28.678 INFO 8496 --- [ Thread-1] j.LocalContainerEntityManagerFactoryBean : Closing JPA EntityManagerFactory for persistence unit 'default'
我有这样的application.properties：
################### DataSource Configuration ##########################
spring.datasource.driverClassName=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/test_auditor
spring.datasource.username=root
spring.datasource.password=<password>
################### Hibernate Configuration ##########################
hibernate.dialect=org.hibernate.dialect.MySQLDialect
hibernate.show_sql=true
hibernate.hbm2ddl.auto=create
Users.java：
package org.springframework.data.jpa.example.repository.simple;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.NamedQuery;
import javax.persistence.Table;
import org.springframework.data.jpa.domain.AbstractPersistable;
/**
* Sample user class.
*
* @author Oliver Gierke
* @author Thomas Darimont
*/
@Entity
@Table (name="app_User")
@NamedQuery(name = "User.findByTheUsersName", query = "SELECT u FROM User u where u.username = ?")
public class User extends AbstractPersistable<Long> {
private static final long serialVersionUID = -2952735933715107252L;
@Column(name="username", unique = true) private String username;
@Column (name="firstname")
private String firstname;
@Column (name="lastname")
private String lastname;
public User() {
this(null);
}
/**
* Creates a new user instance.
*/
public User(Long id) {
this.setId(id);
}
public User(String username, String firstname, String lastname) {
this.firstname = firstname;
this.lastname = lastname;
this.username = username;
}
/**
* Returns the username.
*
* @return
*/
public String getUsername() {
return username;
}
/**
* @param username the username to set
*/
public void setUsername(String username) {
this.username = username;
}
/**
* @return the firstname
*/
public String getFirstname() {
return firstname;
}
/**
* @param firstname the firstname to set
*/
public void setFirstname(String firstname) {
this.firstname = firstname;
}
/**
* @return the lastname
*/
public String getLastname() {
return lastname;
}
/**
* @param lastname the lastname to set
*/
public void setLastname(String lastname) {
this.lastname = lastname;
}
@Override
public String toString() {
return String.format(
"User[id=%d, username='%s', firstName='%s', lastName='%s']",
super.getId(), this.username, this.firstname, this.lastname);
}
}
Simple Configuration.java：
package org.springframework.data.jpa.example.repository.simple;
import java.util.List;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
/**
* @author Oliver Gierke
*/
@Configuration
@PropertySource(value = { "classpath:application.properties" })
@EnableJpaRepositories
@EnableAutoConfiguration
class SimpleConfiguration {
public static void main(String[] args) {
ConfigurableApplicationContext context = SpringApplication.run(
SimpleConfiguration.class);
SimpleUserRepository repository = context
.getBean(SimpleUserRepository.class);
repository.save(new User("harmathu", "Harsh", "Mathur"));
repository.save(new User("vibmathu", "Vibhor", "Mathur"));
repository.save(new User("jackbau", "Jack", "Bauer"));
repository.save(new User("chobr", "Chloe", "O'Brian"));
repository.save(new User("kimbau", "Kim", "Bauer"));
repository.save(new User("davipa", "David", "Palmer"));
repository.save(new User("midess", "Michelle", "Dessler"));
Iterable<User> users = repository.findAll();
System.out.println("Users found with findAll():");
System.out.println("-------------------------------");
for (User user : users) {
System.out.println(user);
}
System.out.println();
User user = repository.findOne(1L);
System.out.println("User found with findOne(1L):");
System.out.println("--------------------------------");
System.out.println(user);
System.out.println();
User bauers = repository.findByTheUsersName("chobr");
System.out.println("User found with findByLastName('Bauer'):");
System.out.println("--------------------------------------------");
System.out.println(bauers);
context.close();
}
}
答案 0 :(得分：6)
我认为这是一个Spring Boot问题而不是Spring Data JPA问题。
尝试从以下位置更改您的媒体资源：
hibernate.dialect=org.hibernate.dialect.MySQLDialect
hibernate.show_sql=true
hibernate.hbm2ddl.auto=create
为：
spring.jpa.database=MYSQL
spring.jpa.show-sql=true
spring.jpa.hibernate.ddl-auto=create
答案 1 :(得分：0)
对我而言，看起来Hibernate没有创建表格，因为您已尝试使用与关键字＆＃39; user＆＃39;相同的名称创建表格。 （但你没有提供整个日志）。您可以使用@Table注释更改表格的名称，例如＆＃39; app_user＆＃39;？