/**
* 向hql中设置orderBy条件(可以处理以有order by的hql和没有order by的hql)
*
* @param hql hql语句
* @param page 分页和排序参数
* @return
*/
protected String createHqlAddOrderBy(final String hql, final Page<T> page) {
String newHql = hql;
if (page.isOrderBySetted()) {
String[] orderByArray = StringUtils.split(page.getOrderBy(), ',');
String[] orderArray = StringUtils.split(page.getOrder(), ',');
Assert.isTrue(orderByArray.length == orderArray.length, "分页多重排序参数中,排序字段与排序方向的个数不相等");
String orderByStr = "";
if (StringUtils.contains(newHql, "order by")) {
for (int i = 0; i < orderByArray.length; i++) {
if ((i + 1) == orderByArray.length) {
orderByStr += getAlias(hql) + "." + orderByArray[i].trim() + " " + orderArray[i].trim();
} else {
orderByStr +=
getAlias(hql) + "." + orderByArray[i].trim() + " " + orderArray[i].trim() + ", ";
}
}
newHql = StringUtils.substringBefore(newHql, "order by") + "order by " + orderByStr;
} else {
orderByStr = " order by ";
for (int i = 0; i < orderByArray.length; i++) {
if ((i + 1) == orderByArray.length) {
orderByStr += getAlias(hql) + "." + orderByArray[i].trim() + " " + orderArray[i].trim();
} else {
orderByStr +=
getAlias(hql) + "." + orderByArray[i].trim() + " " + orderArray[i].trim() + ", ";
}
}
newHql += orderByStr;
}
}
log.debug("newHql =" + newHql);
return newHql;
}
/**
* 按Criterion分页查询.
*
* @param page 分页参数.包括pageSize、firstResult、orderBy、asc、autoCount. 其中firstResult可直接指定,也可以指定pageNo.
* autoCount指定是否动态获取总结果数.
* @param criterion 数量可变的Criterion.
* @return 分页查询结果.附带结果列表及所有查询时的参数.
*/
public Page<T> findByCriteria(Page page, Criterion... criterion) {
Assert.notNull(page);
Criteria c = createCriteria(criterion);
if (page.isAutoCount()) {
page.setTotalCount(countQueryResult(page, c));
}
if (page.isOrderBySetted()) {
if (page.getOrder().endsWith("asc")) {
c.addOrder(Order.asc(page.getOrderBy()));
} else {
c.addOrder(Order.desc(page.getOrderBy()));
}
}
// hibernate的firstResult的序号从0开始
c.setFirstResult(page.getFirst() - 1);
c.setMaxResults(page.getPageSize());
page.setResult(c.list());
return page;
}
