休眠：不成功ALTER TABLE

Question

我使用Hibernate的4，我想快速测试@OrderColumn注解，但是我收到以下错误试图这样做：

INFO [main] (SchemaExport.java:343) - HHH000227: Running hbm2ddl schema export 
DEBUG [main] (SchemaExport.java:353) - Import file not found: /import.sql 
DEBUG [main] (SqlStatementLogger.java:104) - 
    alter table Order 
     drop 
     foreign key FK48E972E19D16493 
Hibernate: 
    alter table Order 
     drop 
     foreign key FK48E972E19D16493 
ERROR [main] (SchemaExport.java:425) - HHH000389: Unsuccessful: alter table Order drop foreign key FK48E972E19D16493 
ERROR [main] (SchemaExport.java:426) - 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 
     drop 
     foreign key FK48E972E19D16493' at line 1 
DEBUG [main] (SqlStatementLogger.java:104) - 
    drop table if exists Customer 
Hibernate: 
    drop table if exists Customer 
DEBUG [main] (SqlStatementLogger.java:104) - 
    drop table if exists Order 
Hibernate: 
    drop table if exists Order 
ERROR [main] (SchemaExport.java:425) - HHH000389: Unsuccessful: drop table if exists Order 
ERROR [main] (SchemaExport.java:426) - 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' at line 1 
DEBUG [main] (SqlStatementLogger.java:104) - 
    create table Customer (
     id integer not null auto_increment, 
     primary key (id) 
    ) 
Hibernate: 
    create table Customer (
     id integer not null auto_increment, 
     primary key (id) 
    ) 
DEBUG [main] (SqlStatementLogger.java:104) - 
    create table Order (
     id integer not null auto_increment, 
     number varchar(255), 
     customer_id integer, 
     orders_index integer, 
     primary key (id) 
    ) 
Hibernate: 
    create table Order (
     id integer not null auto_increment, 
     number varchar(255), 
     customer_id integer, 
     orders_index integer, 
     primary key (id) 
    ) 
ERROR [main] (SchemaExport.java:425) - HHH000389: Unsuccessful: create table Order (id integer not null auto_increment, number varchar(255), customer_id integer, orders_index integer, primary key (id)) 
ERROR [main] (SchemaExport.java:426) - 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 (
     id integer not null auto_increment, 
     number varchar(255),' at line 1 
DEBUG [main] (SqlStatementLogger.java:104) - 
    alter table Order 
     add index FK48E972E19D16493 (customer_id), 
     add constraint FK48E972E19D16493 
     foreign key (customer_id) 
     references Customer (id) 
Hibernate: 
    alter table Order 
     add index FK48E972E19D16493 (customer_id), 
     add constraint FK48E972E19D16493 
     foreign key (customer_id) 
     references Customer (id) 
ERROR [main] (SchemaExport.java:425) - HHH000389: Unsuccessful: alter table Order add index FK48E972E19D16493 (customer_id), add constraint FK48E972E19D16493 foreign key (customer_id) references Customer (id) 
ERROR [main] (SchemaExport.java:426) - 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 
     add index FK48E972E19D16493 (customer_id), 
     add constrain' at line 1 
INFO [main] (SchemaExport.java:405) - HHH000230: Schema export complete 

以下是正在使用的代码：

Customer.java

@Entity 
public class Customer { 
     private Integer id; 
     private List<Order> orders; 

     @Id @GeneratedValue 
     public Integer getId() { return id; } 
     public void setId(Integer id) { this.id = id; } 

     @OneToMany(mappedBy="customer") 
     @OrderColumn(name="orders_index") 
     public List<Order> getOrders() { return orders; } 
     public void setOrders(List<Order> orders) { this.orders = orders; } 

     public void addOrder(Order order) { 
      this.orders.add(order); 
      order.setCustomer(this); 
     } 
} 

Order.java

@Entity 
public class Order { 
     private Integer id; 
     private String number; 
     private Customer customer; 

     public Order() {} 
     public Order(String number) { this.number = number; } 


    @Id @GeneratedValue 
     public Integer getId() { return id; } 
     public void setId(Integer id) { this.id = id; } 

     public String getNumber() { return number; } 
     public void setNumber(String number) { this.number = number; } 

     @ManyToOne 
     @JoinColumn(name="customer_id") 
     public Customer getCustomer() { return customer; } 
     public void setCustomer(Customer customer) { this.customer = customer; } 
} 

TestClient.java

public class Client { 
    public static void main(String[] args) {   
     SessionFactory sessionFactory = new AnnotationConfiguration().configure().buildSessionFactory(); 
     Session session = sessionFactory.openSession(); 
     Transaction txn = session.beginTransaction(); 

     //inserting data into tables 

     Customer leo = new Customer(); 
     List<Order> orders = new ArrayList<Order>(); 
     Order book = new Order("1-sia-2nd-edi"); 
     Order mobile = new Order("2-son-wal"); 
     Order ipod = new Order("3-ipo-app"); 
     orders.add(book);orders.add(mobile);orders.add(ipod); 
     leo.setOrders(orders); 

     session.save(leo); 


     //retrieving data from tables 

     txn.commit(); 
     session.close();    
    } 
} 

的hibernate.cfg.xml

<?xml version="1.0" encoding="UTF-8"?> 
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" 
             "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> 
<hibernate-configuration> 
<session-factory> 
    <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property> 
    <property name="hibernate.connection.password">pass</property> 
    <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/testdb</property> 
    <property name="hibernate.connection.username">root</property> 
    <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property> 

    <property name="hibernate.hbm2ddl.auto">create</property> 
    <property name="hibernate.show_sql">true</property> 
    <property name="hibernate.format_sql">true</property> 
    <property name="hibernate.use_sql_comments">true</property> 

    <mapping class="com.transbinary.entity.Customer"/> 
    <mapping class="com.transbinary.entity.Order"/> 
</session-factory> 
</hibernate-configuration> 

有人能帮助我了解为什么我收到这个错误？

Answer 1

order是mysql.so中的关键字使用不同的名称。我认为这可能是问题。 它会工作，如果你改变表名。我测试了它。