Question

我在我的项目中使用了hibernate：config

<?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">oracle.jdbc.OracleDriver</property>
    <property name="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</property>
    <property name="hibernate.connection.url">jdbc:oracle:thin:@oracle...</property>
    <property name="hibernate.connection.username">name</property>
    <property name="hibernate.connection.password">passwd</property>
    <property name="hibernate.current_session_context_class">thread</property>

    <property name="hibernate.enable_lazy_load_no_trans">true</property>
    <mapping resource="db/Sanitka.hbm.xml"/>
    <mapping resource="db/Sanitari.hbm.xml"/>
    <mapping resource="db/Nemocnica.hbm.xml"/>
  </session-factory>
</hibernate-configuration>

我的帮助文件看起来像这样

public class helper {
    private static Session session = NewHibernateUtil.getSessionFactory().getCurrentSession();

    public static List<Sanitka> getNemocnicas() {
    List<Nemocnica> filmList = null;
    org.hibernate.Transaction  tx = null;
    try {
         tx = session.beginTransaction();
        Query q = session.createQuery ("from Nemocnica");
        filmList = (List<Nemocnica>) q.list();

    } catch (Exception e) {

        e.printStackTrace();
    }

    return filmList;
}
    public static List<Nemocnica> getSanitkas() {
    List<Nemocnica> filmList = null;
     org.hibernate.Transaction  tx = null;
    try {
         tx = session.beginTransaction();
        Query q = session.createQuery ("from Sanitka");
        filmList = (List<Nemocnica>) q.list();
    } catch (Exception e) {
        e.printStackTrace();
    }

    return filmList;
}
}

我正在建立宁静的api，

/nemocnica

route调用getNemocnicas（）

和/sanitkas路由调用getSanitkas（）

问题在于，当我转到/nemocnica时，会调用getNemocnicas（）并从数据库返回查询，但在此之后我想转到/sanitkas

它抛出

org.hibernate.TransactionException：不支持嵌套事务

错误。我读到它是bcs我没有关闭之前交易的会话。但是当我添加

if( tx != null)
     tx.commit()

在这些方法的return语句之前，它抛出了这个错误：

org.hibernate.SessionException：会话已关闭！

然后关闭交易的最佳方式是什么？

感谢您的帮助！

不支持嵌套事务hibernate

0 个答案: