Question

试图找出如何使用wavemaker来运行hql查询。我对java没有多少经验，但我希望能够编写一个查询并通过java代码运行它。要做到这一点，我应该使用java服务吗？如果没有，那怎么样？

我见过这段代码：

import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.Transaction;

Session session = sessionFactory.openSession();
Transaction tx = session.beginTransaction();

Query query = session.createQuery("select and so on..");
// set parameter values, e.g.
// query.setString("name", "Matthias");
List result = query.list();

tx.commit();
session.close();

有人可以解释会话和交易等课程，以便我能理解这个过程吗？如何显示结果列表并在我的数据库中更新？

Answer 1

您可以使用此示例代码

import com.wavemaker.runtime.RuntimeAccess;

import org.hibernate.Session;
import org.hibernate.SQLQuery;
import java.util.List;
import java.util.ArrayList;

import com.yourDBService.yourDB;

public class dbutil extends com.wavemaker.runtime.javaservice.JavaServiceSuperClass {
    /* Pass in one of FATAL, ERROR, WARN,  INFO and DEBUG to modify your log level;
     *  recommend changing this to FATAL or ERROR before deploying.  For info on these levels, look for tomcat/log4j documentation
     */
    public dbutil() {
       super(INFO);
    }

 public void updateStatus(String transactionId, String status) {

        String sQuery = "";
        try {
            service.begin();
            Session session = service.getDataServiceManager().getSession();
            sQuery = "update dbo.ORDERS_TEST set status='" + status + "' where transaction_id = " + transactionId;
            System.out.println(">>>> Check the query string >>>>#" + sQuery + "#");
            SQLQuery query = session.createSQLQuery(sQuery);

            query.executeUpdate();

            service.commit();
        }
        catch (Exception ex) {
            service.rollback();
        }
    }
}

Answer 2

你可以使用wavemaker＆＃34; com.wavemaker.runtime.RuntimeAccess＆＃34;并使用它你可以做所有的操作......请在wavemaker网站上阅读以获取简要的知识

Java服务和hql查询 - wavemaker 6.5

2 个答案: