java - 如果记录不存在，则 Hibernate 插入

Question

我如何使用 Hibernate 执行此操作 - 如果记录不存在，请插入它。

我有以下列

Id(主键)，股票代码，代码名称，行业，部门，最后更新

如果字符串存在，我想检查 Ticker Symbol Column 的记录，如果不存在则不执行任何操作，然后插入一个新行，其中包含 Id、Ticker Symbol、Ticker Name、Industry、Sector 和 Update Date(今天的日期)。

我已经使用下面的代码创建了一个新表。

//Hibernate Create a Session Factory    
 SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();         
 for (int i = 0; i < Bloomberg.getTickerSymbol().size(); i++){

            //Hibernate to store Stock Tickers Data     
        tickerInfo.setTickerSymbol(Bloomberg.getTickerSymbol().get(i)); //Symbol
        tickerInfo.setTickerName(Bloomberg.getTickerName().get(i)); //Name
        tickerInfo.setTickerSector(Bloomberg.getTickerSector().get(i)); //Sector
        tickerInfo.setTickerIndustry(Bloomberg.getTickerIndustry().get(i)); //Industry
        tickerInfo.setTickerLastUpdate(Calendar.getInstance().getTime()); //Update Date

        org.hibernate.Session session = sessionFactory.openSession();
        session.beginTransaction();
        session.saveOrUpdate(tickerInfo);
        session.getTransaction().commit();
        session.close();
}

Answer 1

 //Hibernate Create a Session Factory    
 SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();         
for (int i = 0; i < Bloomberg.getTickerSymbol().size(); i++){

        //Hibernate to store Stock Tickers Data     
    tickerInfo.setTickerSymbol(Bloomberg.getTickerSymbol().get(i)); //Symbol
    tickerInfo.setTickerName(Bloomberg.getTickerName().get(i)); //Name
    tickerInfo.setTickerSector(Bloomberg.getTickerSector().get(i)); //Sector
    tickerInfo.setTickerIndustry(Bloomberg.getTickerIndustry().get(i)); //Industry
    tickerInfo.setTickerLastUpdate(Calendar.getInstance().getTime()); //Update Date

    org.hibernate.Session session = sessionFactory.openSession();
    List tickerInfos = session.createCriteria(TickerInfo.class).add(Restrictions.eq("tickerSymbol", Bloomberg.getTickerSymbol().get(i))).list();
   if(tickerInfos.size()<1){
         session.beginTransaction(); 
         session.saveOrUpdate(tickerInfo);
         session.getTransaction().commit();
   }
 }
session.close();