小贝子编程

如何使休眠仅在表不存在时才创建表？



我才能在不存在的情况下才能制作冬眠才能创建表？我只是将" Hibernate.hbm2ddl.auto"设置为"更新"，但是在重新启动服务器时，它会出现错误，就像"关系已经存在"

我的persistence.xml： - 

<persistence xmlns="http://java.sun.com/xml/ns/persistence"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
         version="2.0">
<persistence-unit name="com.adwork">
    <description>Adwork</description>
    <provider>org.hibernate.ejb.HibernatePersistence</provider>
    <!-- <class>com.mkyong.bean.User</class>  -->
    <properties>
        <property name="hibernate.dialect" value="org.hibernate.dialect.PostgreSQLDialect"/>
        <property name="hibernate.hbm2ddl.auto" value="update"/>
        <property name="show_sql" value="true"/>
        <property name="hibernate.temp.use_jdbc_metadata_defaults" value="false"/>
        <property name="javax.persistence.jdbc.driver" value="org.postgresql.Driver"/>
        <property name="javax.persistence.jdbc.url" value="jdbc:postgresql://localhost:5432/adwork"/>
        <property name="javax.persistence.jdbc.user" value="root"/>
        <property name="javax.persistence.jdbc.password" value="root"/>
    </properties>
</persistence-unit>

请帮忙。谢谢

这是错误： - 

ERROR: org.springframework.web.context.ContextLoader - Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'applicationStartUp' defined in ServletContext resource [/WEB-INF/spring/root-context.xml]: Invocation of init method failed; nested exception is javax.persistence.PersistenceException: [PersistenceUnit: com.adwork] Unable to build Hibernate SessionFactory
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1578)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:545)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:775)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:861)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:541)
at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:444)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:326)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:107)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4727)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5189)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:724)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:700)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:734)
at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:596)
at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1805)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: javax.persistence.PersistenceException: [PersistenceUnit: com.adwork] Unable to build Hibernate SessionFactory
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.persistenceException(EntityManagerFactoryBuilderImpl.java:877)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:805)
at org.hibernate.jpa.HibernatePersistenceProvider.createEntityManagerFactory(HibernatePersistenceProvider.java:58)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:55)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:39)
at com.adwork.survey.config.ApplicationStartUp.initIt(ApplicationStartUp.java:27)
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.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeCustomInitMethod(AbstractAutowireCapableBeanFactory.java:1706)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1645)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1574)
... 25 more
Caused by: org.hibernate.tool.schema.spi.SchemaManagementException: Unable to execute schema management to JDBC target [alter table person add column createdDate timestamp not null]
at org.hibernate.tool.schema.internal.TargetDatabaseImpl.accept(TargetDatabaseImpl.java:59)
at org.hibernate.tool.schema.internal.SchemaMigratorImpl.applySqlString(SchemaMigratorImpl.java:420)
at org.hibernate.tool.schema.internal.SchemaMigratorImpl.applySqlStrings(SchemaMigratorImpl.java:438)
at org.hibernate.tool.schema.internal.SchemaMigratorImpl.migrateTable(SchemaMigratorImpl.java:247)
at org.hibernate.tool.schema.internal.SchemaMigratorImpl.doMigrationToTargets(SchemaMigratorImpl.java:170)
at org.hibernate.tool.schema.internal.SchemaMigratorImpl.doMigration(SchemaMigratorImpl.java:60)
at org.hibernate.tool.hbm2ddl.SchemaUpdate.execute(SchemaUpdate.java:129)
at org.hibernate.tool.hbm2ddl.SchemaUpdate.execute(SchemaUpdate.java:97)
at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:481)
at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build(SessionFactoryBuilderImpl.java:444)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:802)
... 36 more
Caused by: org.postgresql.util.PSQLException: ERROR: column "createddate" of relation "person" already exists
at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2270)
at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1998)
at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:255)
at org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:570)
at org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:406)
at org.postgresql.jdbc2.AbstractJdbc2Statement.executeUpdate(AbstractJdbc2Statement.java:334)
at org.hibernate.tool.schema.internal.TargetDatabaseImpl.accept(TargetDatabaseImpl.java:56)
... 46 more

我的域类： - 

@Entity
@Table(name = "person")
public class Person implements Serializable
{
/**
 * 
 */
private static final long serialVersionUID = 5129388836708407722L;
@Id
private Long id;
@OneToOne
@JoinColumn(name = "userId")
private Users user;
@Column(name = "firstName",nullable = false)
private String firstName;
@Column(name = "middleName",nullable = false)
private String middleName;
@Column(name = "lastName",nullable = false)
private String lastName;
@Column(name = "gender",nullable = false)
private String gender;
@Column(name = "dateOfBirth",nullable = false)
private Date dateOfBirth;
@Column(name = "age",nullable = false)
private Byte age;
@Column(name = "createdDate",nullable = false)
private Timestamp createdDate;
@Column(name = "lastUpdatedDate",nullable = false)
private Timestamp lastUpdateDate;
public Person() 
{
    // TODO Auto-generated constructor stub
}
//and setters / getters 
}

db创建表脚本： - 

CREATE TABLE person
(
  id bigint NOT NULL,
  age smallint NOT NULL,
  createddate timestamp without time zone NOT NULL,
  dateofbirth date NOT NULL,
  firstname character varying(255) NOT NULL,
  gender character varying(255) NOT NULL,
  lastname character varying(255) NOT NULL,
  lastupdateddate timestamp without time zone NOT NULL,
  middlename character varying(255) NOT NULL,
  userid bigint,
  CONSTRAINT person_pkey PRIMARY KEY (id),
  CONSTRAINT fkd8ja1o2m8k25sf0mxvhu4c0ti FOREIGN KEY (userid)
  REFERENCES users (user_id) MATCH SIMPLE
  ON UPDATE NO ACTION ON DELETE NO ACTION
)
WITH (
  OIDS=FALSE
);
ALTER TABLE person
  OWNER TO root;

具有更改列名称的表： - 

CREATE TABLE person
(
  id bigint NOT NULL,
  age smallint NOT NULL,
  "createdDate" timestamp without time zone NOT NULL,
  dateofbirth date NOT NULL,
  firstname character varying(255) NOT NULL,
  gender character varying(255) NOT NULL,
  lastname character varying(255) NOT NULL,
  lastupdateddate timestamp without time zone NOT NULL,
  middlename character varying(255) NOT NULL,
  userid bigint,
  CONSTRAINT person_pkey PRIMARY KEY (id),
  CONSTRAINT fkd8ja1o2m8k25sf0mxvhu4c0ti FOREIGN KEY (userid)
  REFERENCES users (user_id) MATCH SIMPLE
  ON UPDATE NO ACTION ON DELETE NO ACTION
)
WITH (
  OIDS=FALSE
);
ALTER TABLE person
  OWNER TO root;

现在我重新启动服务器并发生了新的错误： - 

Feb 21, 2017 11:26:07 AM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 1572 ms
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/D:/sts-bundle/pivotal-tc-server- developer-3.2.2.RELEASE/base-instance/wtpwebapps/FeePaymentPortal/WEB-INF/lib/slf4j-log4j12-1.6.6.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/D:/sts-bundle/pivotal-tc-server-developer-3.2.2.RELEASE/base-instance/wtpwebapps/FeePaymentPortal/WEB-INF/lib/slf4j-simple-1.7.7.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
INFO : org.springframework.web.context.ContextLoader - Root WebApplicationContext: initialization started
INFO : org.springframework.web.context.support.XmlWebApplicationContext - Refreshing Root WebApplicationContext: startup date [Tue Feb 21 11:26:11 IST 2017]; root of context hierarchy
INFO : org.springframework.beans.factory.xml.XmlBeanDefinitionReader - Loading XML bean definitions from ServletContext resource [/WEB-INF/spring/root-context.xml]
INFO : org.springframework.beans.factory.xml.XmlBeanDefinitionReader - Loading XML bean definitions from ServletContext resource [/WEB-INF/spring/security-context.xml]
INFO : org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor - JSR-330 'javax.inject.Inject' annotation found and supported for autowiring
WARN : org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl - HHH000402: Using Hibernate built-in connection pool (not for production use!)
ERROR: org.hibernate.tool.hbm2ddl.SchemaExport - HHH000389: Unsuccessful: alter table role drop constraint FKgg3583634e0ydkacyk8wbbm19
ERROR: org.hibernate.tool.hbm2ddl.SchemaExport - ERROR: relation "role" does not exist
ERROR: org.hibernate.tool.hbm2ddl.SchemaExport - HHH000389: Unsuccessful: alter table user_roles drop constraint FKhfh9dx7w3ubf1co1vdev94g3f
ERROR: org.hibernate.tool.hbm2ddl.SchemaExport - ERROR: relation "user_roles" does not exist
INFO : org.springframework.web.context.ContextLoader - Root WebApplicationContext: initialization completed in 7665 ms
INFO : org.springframework.web.servlet.DispatcherServlet - FrameworkServlet 'appServlet': initialization started
INFO : org.springframework.web.context.support.XmlWebApplicationContext -  Refreshing WebApplicationContext for namespace 'appServlet-servlet': startup date [Tue Feb 21 11:26:18 IST 2017]; parent: Root WebApplicationContext
INFO : org.springframework.beans.factory.xml.XmlBeanDefinitionReader - Loading XML bean definitions from ServletContext resource [/WEB-INF/spring/appServlet/servlet-context.xml]
INFO : org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor - JSR-330 'javax.inject.Inject' annotation found and supported for autowiring
INFO : org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping - Mapped "{[/],methods=[GET]}" onto public java.lang.String org.giks.controllers.HomeController.home(org.springframework.ui.ModelMap)
INFO : org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping - Mapped "{[/payment-month],methods=[GET]}" onto public java.lang.String org.giks.controllers.HomeController.paymentMonth(org.springframework.ui.ModelMap)
INFO : org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping - Mapped "{[/payment-type],methods=[GET]}" onto public java.lang.String org.giks.controllers.HomeController.paymentMethod(org.springframework.ui.ModelMap)
INFO : org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping - Mapped "{[/payment-verified],methods=[GET]}" onto public java.lang.String org.giks.controllers.HomeController.paymentVerified(org.springframework.ui.ModelMap)
INFO : org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping - Mapped "{[/student-fees],methods=[GET]}" onto public java.lang.String org.giks.controllers.HomeController.getStudentFees(org.springframework.ui.ModelMap)
INFO : org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping - Mapped "{[/student-details],methods=[GET]}" onto public java.lang.String org.giks.controllers.HomeController.getStudentDetails(org.springframework.ui.ModelMap)
INFO : org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter - Looking for @ControllerAdvice: WebApplicationContext for namespace 'appServlet-servlet': startup date [Tue Feb 21 11:26:18 IST 2017]; parent:  Root WebApplicationContext
INFO : org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter - Looking for @ControllerAdvice: WebApplicationContext for namespace 'appServlet-servlet': startup date [Tue Feb 21 11:26:18 IST 2017]; parent: Root WebApplicationContext
INFO : org.springframework.web.servlet.handler.SimpleUrlHandlerMapping - Mapped URL path [/resources/**] onto handler 'org.springframework.web.servlet.resource.ResourceHttpRequestHandler#0'
INFO : org.springframework.web.servlet.DispatcherServlet - FrameworkServlet 'appServlet': initialization completed in 2426 ms
Feb 21, 2017 11:26:21 AM org.apache.catalina.startup.Catalina start
INFO: Server startup in 14090 ms

i 相信 的主要问题是，PostgreSQL列名称不是案例敏感的（默认情况下，它将未引用的列名称转换为小写），但是Hibernate是。

因此，与您的原始createddate列：

  • 您的域类指定createdDate，资本d。
  • 您的表使用createddate，小写d。
  • Hibernate，在尝试更新架构（Hibernate.hbm2ddl.auto = Update）时，请寻找一个名为 createdDate的列，如域类指定时，找不到一个，因为"createddate" != "createdDate"，CASE敏感需要添加并尝试这样做。
  • 添加操作失败，因为存在具有同等名称的列，根据PostgreSQL（不敏感）。

所以您的选择有：

  1. 在您的域类中指定小写列的名称，或
  2. 确保表中的列名使用匹配案例，并指出您必须在列创建语句中引用列名来保存案例。

如您所见，当您手动将表列名称更改为createdDate时，它解决了第一个错误（因此暴露了新错误）。

至于您关于"关系...不存在"的新错误，我不完全确定，但是我 think ，这也与表名中的情况相关性问题连接在一起，您'必须进一步调查。至少这是一种可能性。

我对Hibernate不够使用PostgreSQL来知道是否有更轻松的选择，例如一些方言选项或某个地方可以使它们一起玩耍的地方。

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