主要是工作中用到的關於jpa的條件查詢，使用了specification的predicate(斷言查詢)條件查詢代替原生sql或@query註解：
/**
* 展示列表和條件查詢(多條件查詢)
* @param status
* @param createtime
* @param ordernum
* @param modelname
* @param pageable
* @return
*/@override
public pagegetallordertaking(string status, string createtime, string ordernum, string modelname, pageable pageable)
if(null != modelname)
if(null != createtime && !""
.equals(createtime))else
} catch (parseexception e)
}if(null != ordernum && !""
.equals(ordernum))
if(stringutils.isnotempty(ordernum) & stringutils.isnotempty(modelname))else
}}else
return criteriabuilder.and(predicates.toarray(new predicate[predicates.size()]));}};
pagepage = orderrepository.findall(specification,pageable);
//組裝vo實體
listordervos = new arraylist<>();
page.getcontent().stream().foreach(order -> );
pagevopage = new pageimpl<>(ordervos,pageable,page.gettotalelements());
return vopage;
}
//categoryname是我們需要查詢的列(字段)
subquerycategoryname = criteriaquery.subquery(string.class);
//root（實體對應的資料庫表）
rootcategoryroot = categoryname.from(category.class);
//通過單錶的查詢需要的列並新增where條件 categoryname.select(categoryroot.get("categorynum")).where(criteriabuilder.like(categoryroot.get("name"),"%"+modelname+"%"));
//同樣categorynum是我們需要查詢的列(字段)，但不在同在一張表中
subquerycategorynum = criteriaquery.subquery(string.class);
rootgoodsroot = categorynum.from(goods.class); categorynum.select(goodsroot.get("id")).where(goodsroot.get("categorynum").in(categoryname));
predicate1 = criteriabuilder.in(root.get("goodsid")).value(categorynum);
predicate p1 = criteriabuilder.equal(root.get("status"),order.status
.valueof("待審核"));
private
final
static string time_min = " 00:00:00 000";
private
final
static string time_max = " 23:59:59 999";
private
final
static string date_format = "yyyy-mm-dd hh:mm:ss sss";
//查詢是否在兩個時間段之間
predicates.add(criteriabuilder.greaterthanorequalto(root.get("createtime"), new ******dateformat(date_format).parse(createtime + time_min)));
predicates.add(criteriabuilder.lessthanorequalto(root.get("createtime"), new ******dateformat(date_format).parse(createtime + time_max)));
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