我有一个很奇怪的问题,我不明白这是什么原因。
我试图保存只有 1 个字段 (@id groupName)、getter 和 setter 的简单对象 (Group.class)。 当我尝试运行我的程序时,出现异常:
Exception in thread "main" org.hibernate.exception.SQLGrammarException: Could not execute JDBC batch update at
...
Caused by: java.sql.BatchUpdateException: 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 'Group (groupName) values ('Test')' at line 1
但如果我指定实体名称(不同于组),一切正常。 你能解释一下我做错了什么吗?
代码:
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.bytecode.use_reflection_optimizer">false</property>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/test</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">root</property>
<property name="dialect">org.hibernate.dialect.MySQL5Dialect</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="show_sql">true</property>
<property name="hbm2ddl.auto">create</property>
<mapping class="com.globallogic.dto.Group"></mapping>
</session-factory>
</hibernate-configuration>
import javax.persistence.*;
组.类
@Entity //this doesn't work
//@Entity(name = "SomeName") // this works good
public class Group {
@Id
private String groupName;
public void setGroupName(String groupName) {
this.groupName = groupName;
}
public String getGroupName() {
return groupName;
}
}
DataSender.class
public class DataSender {
private SessionFactory sessionFactory;
public DataSender() {
sessionFactory = new Configuration().configure()
.buildSessionFactory();
}
public void sendData(Object... objects) {
Session session = sessionFactory.openSession();
if (session.isConnected()) {
System.out.println("ALL IS GOOD");
session.beginTransaction();
for (Object user: objects) {
session.persist(user);
}
System.out.println();
session.getTransaction().commit();
session.close();
System.out.println("Connection is closed");
}
sessionFactory.close();
}
}
主类
public class Main {
public static void main(String[] args) {
DataSender ds = new DataSender();
Group group = new Group();
group.setGroupName("Test");
ds.sendData(group);
}
}
最佳答案
Group
是一个 SQL 关键字,您需要 quote your table name :
@Entity
@Table(name = "`Group`")
public class Group {
....
关于java - Hibernate 无法在不重命名的情况下保存实体,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/43573224/