hibernate：无法执行 JDBC 批量更新

Question

当我想使用 hibernate 创建一对一映射时，错误“无法执行 JDBC 批量更新”不断出现，我注意到这是由于在 Z62A004B95946BB97541AFA47 显示的错误中创建表失败引起的。 你能帮我找出里面的问题吗？ 谢谢！

Hibernate 配置文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
    "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.hbm2ddl.auto">update</property>
<property name="show_sql">true</property>
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="connection.url">jdbc:mysql://localhost/june13?serverTimezone=UTC</property>
<property name="connection.username">root</property>
<property name="connection.password">root</property>
<property name="connection.driver_class">com.mysql.cj.jdbc.Driver</property>
<mapping resource="Emp-hbm.xml"/>
</session-factory>
</hibernate-configuration>

Hibernate 一对一映射文件：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC 
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
    <class name="com.hibernate.one2one.Emp" table="emp_906">
        <id name="id" column="emp_id"></id>
        <property name="name" column="emp_name" />
        <one-to-one name="phoneno" cascade="all"></one-to-one>
    </class>
    <class name="com.hibernate.one2one.PhoneNumber" table="phone_906">
        <id name="pid"></id>
        <property name="network" />
        <property name="phonenumber" />
        <one-to-one name="emp"></one-to-one>
    </class>
</hibernate-mapping>

主文件：

package com.hibernate.one2one;

import java.util.ArrayList;
import java.util.List;

import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.hibernate.classic.Session;

public class App 
{
    public static void main(String[] args) 
    {
        Configuration cfg=new Configuration();
        cfg.configure("Hibernate-cfg.xml");
        System.out.println("Configuration Object Created Successfully");
        SessionFactory sf=cfg.buildSessionFactory();
        System.out.println("Session Factory Object is Created");
        Session s=sf.openSession();
        Transaction t=s.beginTransaction();
        Emp e=new Emp();
        e.setId(104);
        e.setName("Lee Meng");
        PhoneNumber ph = new PhoneNumber();
        ph.setPid(201);
        ph.setNetwork("ATT");
        ph.setPhonenumber("9900336611");
        e.setPhoneno(ph);
        ph.setEmp(e);
        s.persist(e);
        t.commit();
        s.close();
        sf.close();
    }
}

错误代码：

Exception in thread "main" org.hibernate.exception.SQLGrammarException: Could not execute JDBC batch update
    at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:92)
    at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)
    at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:275)
    at org.hibernate.jdbc.AbstractBatcher.prepareStatement(AbstractBatcher.java:114)
    at org.hibernate.jdbc.AbstractBatcher.prepareStatement(AbstractBatcher.java:109)
    at org.hibernate.jdbc.AbstractBatcher.prepareBatchStatement(AbstractBatcher.java:244)
    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2411)
    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2874)
    at org.hibernate.action.EntityInsertAction.execute(EntityInsertAction.java:79)
    at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:273)
    at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:265)
    at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:184)
    at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321)
    at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:51)
    at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1216)
    at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:383)
    at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:133)
    at com.hibernate.one2one.App.main(App.java:32)
Caused by: java.sql.BatchUpdateException: Table 'june13.emp_906' doesn't exist
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
    at com.mysql.cj.util.Util.handleNewInstance(Util.java:192)
    at com.mysql.cj.util.Util.getInstance(Util.java:167)
    at com.mysql.cj.util.Util.getInstance(Util.java:174)
    at com.mysql.cj.jdbc.exceptions.SQLError.createBatchUpdateException(SQLError.java:224)
    at com.mysql.cj.jdbc.ClientPreparedStatement.executeBatchSerially(ClientPreparedStatement.java:853)
    at com.mysql.cj.jdbc.ClientPreparedStatement.executeBatchInternal(ClientPreparedStatement.java:435)
    at com.mysql.cj.jdbc.StatementImpl.executeBatch(StatementImpl.java:796)
    at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:70)
    at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:268)
    ... 15 more
Caused by: java.sql.SQLSyntaxErrorException: Table 'june13.emp_906' doesn't exist
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:120)
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:97)
    at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:122)
    at com.mysql.cj.jdbc.ClientPreparedStatement.executeInternal(ClientPreparedStatement.java:953)
    at com.mysql.cj.jdbc.ClientPreparedStatement.executeUpdateInternal(ClientPreparedStatement.java:1092)
    at com.mysql.cj.jdbc.ClientPreparedStatement.executeBatchSerially(ClientPreparedStatement.java:832)
    ... 19 more

Answer 1

如何将<property name="hbm2ddl.auto" value="create"/>添加到您的 hibernate 配置文件中。 这将确保您的表在启动时创建并保持原样。

validate：验证模式，不更改数据库。 更新：更新架构。 create：创建模式，销毁以前的数据。 create-drop：当 SessionFactory 显式关闭时删除模式，通常是在应用程序停止时。 none：对模式不做任何事情，不对数据库做任何更改

可能值的更广泛描述： Hibernate hbm2ddl.auto 配置的可能值是什么，它们有什么作用