求详解，各位大神麻烦给我解析下下面的的语句，谢谢啦，小弟感激不尽

Question

public List getList(String startTime, String endTime, String mc, Pager pager)

{
    String where = " ";

    where = where + " and " + TypeChange.DateBetweenSql("a.riQi", startTime, endTime);
    if (!TypeChange.toNotNullDao(mc).equals(""))
    {
        where = where + " and   a.mingCheng like '%" + TypeChange.toNotNullDao(mc) + "%'";
    }

    return this.findAll(where, pager);
}


findAll:

private List<Test> findAll(String where, Pager pager)
{
    String hSql = " From  Test a where 1=1 " + where + " order by id ";
    pager.setRowCount(getAllRowCount(hSql));
    Session sess = this.getSessionFactory().openSession();
    try
    {
        Query query = sess.createQuery(hSql);
        query.setFirstResult(pager.getFirstResult());
        query.setMaxResults(pager.getPageSize());
        return query.list();
    }
    finally
    {
        sess.close();
    }
}

Answer 1

public List getList(String startTime, String endTime, String mc, Pager pager)
{
String where = " "; //初始条件为空

where = where + " and " + TypeChange.DateBetweenSql("a.riQi", startTime, endTime); // 把开始结束时间作为条件
if (!TypeChange.toNotNullDao(mc).equals("")) 
{
    where = where + " and   a.mingCheng like '%" + TypeChange.toNotNullDao(mc) + "%'"; // 关键字模糊查询 like %关键字%，就是包含它的文本视作匹配。
}

return this.findAll(where, pager);

}

findAll:

private List findAll(String where, Pager pager) //分页查询
{
String hSql = " From Test a where 1=1 " + where + " order by id "; // 按照条件来匹配，加上1=1是防止where为空
pager.setRowCount(getAllRowCount(hSql)); // 每页的数量
Session sess = this.getSessionFactory().openSession();
try
{
Query query = sess.createQuery(hSql); //构造sql
query.setFirstResult(pager.getFirstResult());
query.setMaxResults(pager.getPageSize());
return query.list();
}
finally
{
sess.close();
}
}