如何针对这种情况创建休眠映射？

debugcn 发表于 Dev

JBMac

我有以下SQL查询：

    SELECT CONNECTIONDATE AS UNLOAD, 
    SUBSTR(ROUTECODE,1,(LENGTH(ROUTECODE)-2)) AS ROUTE, 
    COUNT(SUBSTR(ROUTECODE,1,(LENGTH(ROUTECODE)-2))) AS FREQUENCY 
    FROM RouteTableSynonym RC1 
    WHERE RC1.ROUTECONNECTIONTYPE = 'INBOUND' 
    and RC1.CONNECTIONTIME >= TO_TIMESTAMP('<sdate>', 'DD-MM-YYYY HH24:MI:SS') 
    and RC1.CONNECTIONTIME <= TO_TIMESTAMP('<edate>', 'DD-MM-YYYY HH24:MI:SS') 
    and RC1.LOGISTICSPOINTID in (SELECT DISTINCT RCO1.LOGISTICSPOINTID  
    FROM RouteOrderTableSynonym RCO1 
    WHERE RCO1.NAMC = '<namc>') 
    GROUP BY CONNECTIONDATE, SUBSTR(ROUTECODE,1,(LENGTH(ROUTECODE)-2)) 
    ORDER BY CONNECTIONDATE, ROUTE;

“ < var_name >”指定的所有值都将替换为要查询的值。我也有这个实体类，它将存储此查询的结果：

   import java.util.Date;

   public class DD_BlackoutRouteFrequencies {

        private Date rte_day;
        private String route;
        private int freq;
        private int delayedFreq;

        public Date getRte_day() {
            return rte_day;
        }
        public void setRte_day(Date rte_day) {
            this.rte_day = rte_day;
        }
        public String getRoute() {
            return route;
        }
        public void setRoute(String route) {
            this.route = route;
        }
        public int getFreq() {
            return freq;
        }
        public void setFreq(int freq) {
            this.freq = freq;
        }
        public int getDelayedFreq() {
            return delayedFreq;
        }
        public void setDelayedFreq(int delayedFreq) {
            this.delayedFreq = delayedFreq;
        }   
    }

我执行这样的查询：

    try{
        SQLQuery sqlquery = session.createSQLQuery(query);
        sqlquery.addEntity(DD_BlackoutRouteFrequencies.class);
        results = sqlquery.list();
        logger.debug(results.size());
        System.out.println("Frequnecy Results size: "+results.size());
    }catch(Exception e){
        logger.error("Exception ", e);
        throw new RuntimeException("SQL Exception getting Blackout Route Frequencies: "+ e.getMessage());
    }

我遇到的问题是我无法弄清楚该实体如何进行休眠映射以接收该查询的结果，该查询从两个不同的表中提取其结果。

我是否必须为查询中使用的两个表都进行休眠映射，然后再映射实体？

保罗·瓦尔加斯

您还可以获取地图实例。例如：

SQLQuery sqlQuery = session.createSQLQuery(sql);

// positional parameters (using ?)
sqlQuery.setString(0, sdate);
sqlQuery.setString(1, edate);
sqlQuery.setString(2, namc);

// scalar values for each column
sqlQuery.addScalar("UNLOAD", Hibernate.STRING);
sqlQuery.addScalar("ROUTE", Hibernate.STRING);
sqlQuery.addScalar("FREQUENCY ", Hibernate.INTEGER);

sqlQuery.setResultTransformer(CriteriaSpecification.ALIAS_TO_ENTITY_MAP);
List<Map<String, Object>> list = sqlQuery.list();

for (Map<String, Object> map : list) {
    System.out.println(map.get("UNLOAD"));
    System.out.println(map.get("ROUTE"));
    System.out.println(map.get("FREQUENCY"));
}