HQL查詢語句

hql基本查詢

單屬性和多屬性查詢

listlist = session.createquery("select name,code from province").list();

for (int i = 0;i將多個查詢分裝成物件
listlist1 = session.createquery("select new province(id,name,code) from province").list();
for (int i = 0;i別名使用
listlist = session.createquery("select new province(p.id,p.name,p.code) from province as p").list();
for(province province:list)
listlist = session.createquery("select p from province p").list();
for(province province:list)

使用別名和使用from

listlist = session.createquery("select p from province p").list();

for(province province:list) 
listlist = session.createquery("from province").list();
for(province province:list)

使用setparameter和命名查詢詢，命名查詢–設定條件引數的名稱 以冒號開頭後更名稱 設定引數時 只需指定名

setinterger(0,4)跟setparameter(0,4)效果一樣

listlist = session.createquery("from province p where id<?")

.setparameter(0,4).list();
for(province province:list) 
listlist = session.createquery("from province p where id<:id")
.setparameter("id",4).list();
for(province province:list)

/*

setfirstresult():開始從這個下標開始，不包括這個下標
setmaxresults():設定每頁記錄數pagesize
*//* listlist = session.createquery("from province p")
.setfirstresult(3).setmaxresults(9).list();
for(province province:list) */

number count =  (number) session.createquery("select max(p.id) from province p").uniqueresult();

system.out.println("總數："+count.bytevalue());

listlist = session.createquery("select p.name,count(p.id) from province p group by p.name").list();

for (object objes:list)

desc降序

asc公升序

listlist = session.createquery("from province order by id desc").list();

for (province province:list)

內連線

string hql = "from city c where c.province.name=:name";

hql = "select c from city c join c.province d where d.name=:name";
hql = "select c from city c inner join c.province d where d.name=:name";
listlist = session.createquery(hql).setstring("name","河南省").list();
for (city c:list
)

string hql ="select p.name,c.name from city c left outer join c.province p";

query query = session.createquery(hql);
listlist = query.list();
for (object o:list
)

string sql="select name,price from book";

listlist =session.createsqlquery(sql)
.list();
for(object b:list)

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