模式异常Hibernate一对多

Question

我正在尝试使用Hibernate做一个简单的One To Many关系。想法是一个订单可以有许多订单项。我不知道为什么我会得到这个例外。我对Hibernate对象关系还不熟悉。如果这个程序有任何配置问题，请指出。如果你让我知道如何在hibernate中做这种映射，那就太好了。谢谢！

顺序

package one_to_many;

import java.util.List;

import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.OneToMany;

@Entity
public class Order {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int order_id;
    private String name;
    private String address;

    @OneToMany(cascade = { CascadeType.ALL }, orphanRemoval = true, fetch = FetchType.LAZY)
    @JoinColumn(name = "order_id", nullable = false)
    private List<OrderItem> orderItems;

    public Order() {

    }

    public Order(String name, String address, List<OrderItem> orderItems) {
        this.name = name;
        this.address = address;
        this.orderItems = orderItems;
    }

    public int getOrder_id() {
        return order_id;
    }

    public void setOrder_id(int order_id) {
        this.order_id = order_id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public List<OrderItem> getOrderItems() {
        return orderItems;
    }

    public void setOrderItems(List<OrderItem> orderItems) {
        this.orderItems = orderItems;
    }

}

OrderItem的

package one_to_many;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

@Entity
public class OrderItem {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int orderItemId;
    private String itemName;
    private int quantity;

    public int getOrderItemId() {
        return orderItemId;
    }

    public void setOrderItemId(int orderItemId) {
        this.orderItemId = orderItemId;
    }

    public String getItemName() {
        return itemName;
    }

    public void setItemName(String itemName) {
        this.itemName = itemName;
    }

    public int getQuantity() {
        return quantity;
    }

    public void setQuantity(int quantity) {
        this.quantity = quantity;
    }

    public OrderItem() {

    }

    public OrderItem(String itemName, int quantity) {
        this.itemName = itemName;
        this.quantity = quantity;
    }

    @Override
    public String toString() {
        return "OrderItem [orderItemId=" + orderItemId + ", itemName=" + itemName + ", quantity=" + quantity + "]";
    }

}

转轮

package one_to_many;

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

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

public class Runner {

    public static void main(String[] args) {

        SessionFactory sessionFactory = new Configuration().configure("/one_to_many/hibernate.cfg.xml")
                .buildSessionFactory();
        Session session = sessionFactory.openSession();
        session.beginTransaction();

        List<OrderItem> list = new ArrayList<OrderItem>();

        list.add(new OrderItem("book", 2));
        list.add(new OrderItem("tshirt", 4));

        Order order = new Order("regular", "919 Ridge", list);

        session.save(order);

        session.close();
    }

}

错误

INFO: HHH000262: Table not found: Order
Hibernate: 
    create table Order (
        order_id integer not null auto_increment,
        address varchar(255),
        name varchar(255),
        primary key (order_id)


      )
Aug 11, 2016 9:45:40 PM org.hibernate.tool.schema.internal.ExceptionHandlerLoggedImpl handleException
WARN: GenerationTarget encountered exception accepting command : Unable to execute command [
        create table Order (
            order_id integer not null auto_increment,
            address varchar(255),
            name varchar(255),
            primary key (order_id)

    )]
org.hibernate.tool.schema.spi.CommandAcceptanceException: Unable to execute command [
    create table Order (
        order_id integer not null auto_increment,
        address varchar(255),
        name varchar(255),
        primary key (order_id)
    )]
    at org.hibernate.tool.schema.internal.exec.GenerationTargetToDatabase.accept(GenerationTargetToDatabase.java:63)
    at org.hibernate.tool.schema.internal.SchemaMigratorImpl.applySqlString(SchemaMigratorImpl.java:573)
    at org.hibernate.tool.schema.internal.SchemaMigratorImpl.applySqlStrings(SchemaMigratorImpl.java:557)
    at org.hibernate.tool.schema.internal.SchemaMigratorImpl.createTable(SchemaMigratorImpl.java:345)
    at org.hibernate.tool.schema.internal.SchemaMigratorImpl.performMigration(SchemaMigratorImpl.java:257)
    at org.hibernate.tool.schema.internal.SchemaMigratorImpl.doMigration(SchemaMigratorImpl.java:137)
    at org.hibernate.tool.schema.internal.SchemaMigratorImpl.doMigration(SchemaMigratorImpl.java:110)
    at org.hibernate.tool.schema.spi.SchemaManagementToolCoordinator.performDatabaseAction(SchemaManagementToolCoordinator.java:176)
    at org.hibernate.tool.schema.spi.SchemaManagementToolCoordinator.process(SchemaManagementToolCoordinator.java:65)
    at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:308)
    at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build(SessionFactoryBuilderImpl.java:483)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:707)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:723)
    at one_to_many.Runner.main(Runner.java:15)
Caused by: java.sql.SQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'Order (
        order_id integer not null auto_increment,
        address varcha' at line 1
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:686)
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:663)
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:653)
    at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:115)
    at com.mysql.cj.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2041)
    at com.mysql.cj.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:1994)
    at com.mysql.cj.jdbc.StatementImpl.executeInternal(StatementImpl.java:890)
    at com.mysql.cj.jdbc.StatementImpl.execute(StatementImpl.java:788)
    at org.hibernate.tool.schema.internal.exec.GenerationTargetToDatabase.accept(GenerationTargetToDatabase.java:51)
    ... 13 more

Aug 11, 2016 9:45:40 PM org.hibernate.tool.schema.extract.internal.InformationExtractorJdbcDatabaseMetaDataImpl processGetTableResults
INFO: HHH000262: Table not found: Order
Aug 11, 2016 9:45:40 PM org.hibernate.tool.schema.extract.internal.InformationExtractorJdbcDatabaseMetaDataImpl processGetTableResults
INFO: HHH000262: Table not found: Order
Aug 11, 2016 9:45:40 PM org.hibernate.tool.schema.extract.internal.InformationExtractorJdbcDatabaseMetaDataImpl processGetTableResults
INFO: HHH000262: Table not found: Order
Aug 11, 2016 9:45:40 PM org.hibernate.tool.schema.extract.internal.InformationExtractorJdbcDatabaseMetaDataImpl processGetTableResults
INFO: HHH000262: Table not found: Order
Hibernate: 
    alter table OrderItem 
        add constraint FK1d77ns82kvwa2hwab9k7xcaog 
        foreign key (order_id) 
        references Order (order_id)
Aug 11, 2016 9:45:40 PM org.hibernate.tool.schema.internal.ExceptionHandlerLoggedImpl handleException
WARN: GenerationTarget encountered exception accepting command : Unable to execute command [
    alter table OrderItem 
        add constraint FK1d77ns82kvwa2hwab9k7xcaog 
        foreign key (order_id) 
        references Order (order_id)]
org.hibernate.tool.schema.spi.CommandAcceptanceException: Unable to execute command [
    alter table OrderItem 
        add constraint FK1d77ns82kvwa2hwab9k7xcaog 
        foreign key (order_id) 
        references Order (order_id)]
    at org.hibernate.tool.schema.internal.exec.GenerationTargetToDatabase.accept(GenerationTargetToDatabase.java:63)
    at org.hibernate.tool.schema.internal.SchemaMigratorImpl.applySqlString(SchemaMigratorImpl.java:573)
    at org.hibernate.tool.schema.internal.SchemaMigratorImpl.applySqlStrings(SchemaMigratorImpl.java:557)
    at org.hibernate.tool.schema.internal.SchemaMigratorImpl.applyForeignKeys(SchemaMigratorImpl.java:516)
    at org.hibernate.tool.schema.internal.SchemaMigratorImpl.performMigration(SchemaMigratorImpl.java:315)
    at org.hibernate.tool.schema.internal.SchemaMigratorImpl.doMigration(SchemaMigratorImpl.java:137)
    at org.hibernate.tool.schema.internal.SchemaMigratorImpl.doMigration(SchemaMigratorImpl.java:110)
    at org.hibernate.tool.schema.spi.SchemaManagementToolCoordinator.performDatabaseAction(SchemaManagementToolCoordinator.java:176)
    at org.hibernate.tool.schema.spi.SchemaManagementToolCoordinator.process(SchemaManagementToolCoordinator.java:65)
    at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:308)
    at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build(SessionFactoryBuilderImpl.java:483)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:707)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:723)
    at one_to_many.Runner.main(Runner.java:15)
Caused by: java.sql.SQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'Order (order_id)' at line 4
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:686)
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:663)
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:653)
    at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:115)
    at com.mysql.cj.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2041)
    at com.mysql.cj.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:1994)
    at com.mysql.cj.jdbc.StatementImpl.executeInternal(StatementImpl.java:890)
    at com.mysql.cj.jdbc.StatementImpl.execute(StatementImpl.java:788)
    at org.hibernate.tool.schema.internal.exec.GenerationTargetToDatabase.accept(GenerationTargetToDatabase.java:51)
    ... 13 more

Hibernate: 
    insert 
    into

    Order (address
    , name) 
values
    (?, ?)
Aug 11, 2016 9:45:40 PM org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExceptions
WARN: SQL Error: 1064, SQLState: 42000
Aug 11, 2016 9:45:40 PM org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExceptions
ERROR: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'Order (address, name) values ('919 Ridge', 'regular')' at line 1
Exception in thread "main" org.hibernate.exception.SQLGrammarException: could not execute statement
    at org.hibernate.exception.internal.SQLExceptionTypeDelegate.convert(SQLExceptionTypeDelegate.java:63)
    at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:42)
    at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:111)
    at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:97)
    at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:207)
    at org.hibernate.dialect.identity.GetGeneratedKeysDelegate.executeAndExtract(GetGeneratedKeysDelegate.java:57)
    at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:42)
    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2840)
    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3411)
    at org.hibernate.action.internal.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:81)
    at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:619)
    at org.hibernate.engine.spi.ActionQueue.addResolvedEntityInsertAction(ActionQueue.java:273)
    at org.hibernate.engine.spi.ActionQueue.addInsertAction(ActionQueue.java:254)
    at org.hibernate.engine.spi.ActionQueue.addAction(ActionQueue.java:299)
    at org.hibernate.event.internal.AbstractSaveEventListener.addInsertAction(AbstractSaveEventListener.java:318)
    at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:275)
    at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:182)
    at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:113)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:192)
    at org.hibernate.event.internal.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:38)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:177)
    at org.hibernate.event.internal.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:32)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:73)
    at org.hibernate.internal.SessionImpl.fireSave(SessionImpl.java:668)
    at org.hibernate.internal.SessionImpl.save(SessionImpl.java:660)
    at org.hibernate.internal.SessionImpl.save(SessionImpl.java:655)
    at one_to_many.Runner.main(Runner.java:26)
Caused by: java.sql.SQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'Order (address, name) values ('919 Ridge', 'regular')' at line 1
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:686)
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:663)
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:653)
    at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:115)
    at com.mysql.cj.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2041)
    at com.mysql.cj.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1827)
    at com.mysql.cj.jdbc.PreparedStatement.executeUpdateInternal(PreparedStatement.java:2041)
    at com.mysql.cj.jdbc.PreparedStatement.executeUpdateInternal(PreparedStatement.java:1977)
    at com.mysql.cj.jdbc.PreparedStatement.executeLargeUpdate(PreparedStatement.java:4963)
    at com.mysql.cj.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1962)
    at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:204)
    ... 22 more

Answer 1

名称'order'是mysql中的保留关键字。更改表名称'order'。