dao层extends BaseDaoJpa修改数据设为只读不做更新

因为要在前台将特定数字改为字符串字段，在前台数据量太大不能在前台将数据进行替换，性能消耗太大，所以只能在后台处理，然而问题在这里：

问题一：将数据进行替换时设置字段值时数据库里面的数据也更新了，而我们的要求是特殊字段显示转换字符串，数据库的数据保持不变，

试过好多种方法找到一条最简单实用 的方法解决这个问题

即： session.setReadOnly(item, true);设为只读就解决了这个问题，只读取不做更新

public PageListHelper searchByArgs(PageListHelper page,
Map<String, Object> argMap) {
List args = new ArrayList();
StringBuffer sb = new StringBuffer();
StringBuffer countsb = new StringBuffer();
String argSql = toArgSql(argMap);
String sql = "select a from Item a  where a.deleted = 0 " + argSql;
sb.append(sql);
countsb.append("select count(a) from Item a where a.deleted = 0 ");
countsb.append(argSql);

sb.append(" order by publisherTime desc ");
Query q = this.entityManager.createQuery(sb.toString());
Query countQuery = this.entityManager.createQuery(countsb.toString());
for (int i = 0; i < args.size(); i++) {
q.setParameter(i + 1, args.get(i));
countQuery.setParameter(i + 1, args.get(i));
}
Long count = (Long) countQuery.getSingleResult();
q.setFirstResult(page.getStartPosition());
q.setMaxResults(page.getObjectsPerPage());
page.setFullListSize(Integer.parseInt(count.toString()));
List<Item> itemList = q.getResultList();
try {
Session session = (Session) this.entityManager.getDelegate();
for (int i = 0; i < itemList.size(); i++) {
Item item = itemList.get(i);
// 设置上牌地
if (StringUtils.isNotBlank(item.getCarLicenseLocate())) {

String provinceSql = "select name from province where code="
+ item.getCarLicenseLocate().split("-")[0];
org.hibernate.Query provinceQuery = session
.createSQLQuery(provinceSql);
String proviceName = provinceQuery.uniqueResult()
.toString();
String zxSql = "select zx_flag from province where code="
+ item.getCarLicenseLocate().split("-")[0];
org.hibernate.Query zxQuery = session.createSQLQuery(zxSql);
String zx = zxQuery.uniqueResult().toString();
if ("1".equals(zx)) {
//item.setCarLicenseLocate(proviceName);
item.setCarLicenseLocateFormat(proviceName);
} else {
// 得到city
String citySql = "select name from city where code="
+ item.getCarLicenseLocate().split("-")[1];
org.hibernate.Query cityQuery = session
.createSQLQuery(citySql);
String cityName = cityQuery.uniqueResult().toString();
item.setCarLicenseLocateFormat(proviceName + cityName);
}

/*
* // 得到province String provinceSql =
* "select name from province where code=" +
* item.getCarLicenseLocate().split("-")[0];
* org.hibernate.Query provinceQuery = session
* .createSQLQuery(provinceSql); String proviceName =
* provinceQuery.uniqueResult() .toString(); // 得到city
* String citySql = "select name from city where code=" +
* item.getCarLicenseLocate().split("-")[1];
* org.hibernate.Query cityQuery = session
* .createSQLQuery(citySql); String cityName =
* cityQuery.uniqueResult().toString();
* item.setCarLicenseLocate(proviceName + " " + cityName);
*/
}
// 设置颜色
if (StringUtils.isNotBlank(String.valueOf(item.getCarColor()))) {
// detail_dic_name
String colorNameSql = "select t.detail_dic_name from (select * from sys_dic_item "
+ "where dic_parent_code = 'color')as t where t.detail_dic_code='"
+ item.getCarColor() + "'";
org.hibernate.Query colorQuery = session
.createSQLQuery(colorNameSql);
String colorName = colorQuery.uniqueResult().toString();
item.setCarColor(colorName);
}
session.setReadOnly(item, true);
}
page.setList(itemList);
} catch (Exception e) {
e.printStackTrace();
log.error(e);
}

return page;
}