In Hibernate, there are number of ways to accessing a data: HQL, native SQL and others.
This section shows the implementation of HQL and native SQL.
These method are all defined in the DAO implementation classes.

The syntax of HQL is very much like SQL, but HQL is Hibernate object oriented.

SELECT * 
FROM RTRN_TP_RSN_CMBN  
WHERE rtrn_tp_cd ='01'
AND rtrn_rsn_cd ='001'

The above SQL is implemented as HQL as follow: (Source Code)

public RTRN_TP_RSN_CMBN getTpRsnCmbnByHql(String rtrnTpCd, String rtrnRsnCd) {

	String hqlStr = "from RTRN_TP_RSN_CMBN " 
			+ "where rtrn_tp_cd = :rtrnTpCd "
			+ "and   rtrn_rsn_cd = :rtrnRsnCd ";
	
	Query query = super.getCurrSession().createQuery(hqlStr);
	query.setParameter("rtrnTpCd", rtrnTpCd);
	query.setParameter("rtrnRsnCd", rtrnRsnCd);

	List<RTRN_TP_RSN_CMBN> list = query.list();
	if (list != null && list.size() > 0) {
		return (RTRN_TP_RSN_CMBN) list.get(0);
	}
	return null;
}

Native SQl: The result will be a list of Object Array.

SELECT 
 a1.rtrn_rsn_cd 
,a1.rtrn_rsn_nm 
,a1.sort_num 
,'' as rtrn_tp_cd 
FROM rtrn_rsn a1 
WHERE NOT EXISTS ( 
   SELECT '*' 
   FROM rtrn_rsn a2 
   JOIN rtrn_tp_rsn_cmbn cmb 
   ON a2.rtrn_rsn_cd = cmb.rtrn_rsn_cd 
   WHERE cmb.rtrn_tp_cd  = '02'
   AND a2.rtrn_rsn_cd = a1.rtrn_rsn_cd 
) 
ORDER BY a1.sort_num

The above SQL is implemented as follow: (Source Code)

public List<Object[]> getListRsnsUnBoundTpBySql(String tpCd) {
	
	StringBuilder sb = new StringBuilder();
	sb.append("\n");
	sb.append("SELECT \n");
	sb.append(" a1.rtrn_rsn_cd \n");
	sb.append(",a1.rtrn_rsn_nm \n");
	sb.append(",a1.sort_num \n");
	sb.append(",'' as rtrn_tp_cd \n");
	sb.append("FROM rtrn_rsn a1 \n");
	sb.append("WHERE NOT EXISTS ( \n");
	sb.append("   SELECT '*' \n");
	sb.append("   FROM rtrn_rsn a2 \n");
	sb.append("   JOIN rtrn_tp_rsn_cmbn cmb \n");
	sb.append("   ON a2.rtrn_rsn_cd = cmb.rtrn_rsn_cd \n");
	sb.append("   WHERE cmb.rtrn_tp_cd  = :tpCd \n");
	sb.append("   AND a2.rtrn_rsn_cd = a1.rtrn_rsn_cd \n");
	sb.append(") \n");
	sb.append("ORDER BY a1.sort_num");

	Query query = super.getCurrSession().createSQLQuery(sb.toString());
	query.setParameter("tpCd", tpCd);

	List<Object[]> list = query.list();
	return list;
}