一、延遲加載

//用戶(hù)發(fā)布的主題，一對(duì)多；Table：外鍵表；ColumnKey：外鍵；Lazy：延遲加載；Cascade：級(jí)聯(lián)操作（級(jí)聯(lián)刪除）[HasMany(typeof(ThemeInfo), Table = "ThemeInfo", ColumnKey = "UserID", Lazy = true, Cascade = ManyRelationCascadeEnum.Delete)]public virtual IList<ThemeInfo> ThemeInfos { get; set; }

Lazy=true，當(dāng)需要用到的時(shí)候才會(huì)自動(dòng)讀取，用法：

//延遲加載，必須使用 using (new SessionScope())using (new SessionScope()){StringBuilder htmlStr1 = new StringBuilder();IList<Models.UserInfo> list1 = Models.UserInfo.FindAll();foreach (Models.UserInfo item in list1){htmlStr1.Append("編號(hào)：" + item.ID + "  名稱(chēng)：" + item.Name + "<br />");htmlStr1.Append("&nbsp;&nbsp;&nbsp;&nbsp;我的主題：<br />");foreach (Models.ThemeInfo item2 in item.ThemeInfos){htmlStr1.Append("&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;編號(hào)：" + item2.ID + "  名稱(chēng)：" + item2.Subject + "<br />");}}Literal1.Text = htmlStr1.ToString();int PageCount = 0;StringBuilder htmlStr2 = new StringBuilder();IList<Models.UserInfo> list2 = Models.UserInfo.FindInPage(2, 3, ref PageCount);foreach (Models.UserInfo item in list2){htmlStr2.Append("編號(hào)：" + item.ID + "  名稱(chēng)：" + item.Name + "<br />");htmlStr2.Append("&nbsp;&nbsp;&nbsp;&nbsp;我的主題：<br />");foreach (Models.ThemeInfo item2 in item.ThemeInfos){htmlStr2.Append("&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;編號(hào)：" + item2.ID + "  名稱(chēng)：" + item2.Subject + "<br />");}}Literal2.Text = htmlStr2.ToString();Literal3.Text = PageCount + "";}

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分頁(yè)查詢(xún)：

//分頁(yè)獲取數(shù)據(jù)public static IList<UserInfo> FindInPage(int PageIndex, int PageSize, ref int PageCount){int BeginIndex = ((PageIndex - 1) * PageSize);string hql = " from UserInfo c ";SimpleQuery<UserInfo> query = new SimpleQuery<UserInfo>(hql);query.SetQueryRange(BeginIndex, PageSize);//設(shè)置從哪一條開(kāi)始ScalarQuery squery = new ScalarQuery(typeof(UserInfo), "select Count(*) from UserInfo");int recordCount = Convert.ToInt32(ExecuteQuery(squery));//獲得總條數(shù)PageCount = (recordCount / PageSize) + (recordCount % PageSize > 0 ? 1 : 0);return query.Execute();}

　　

二、使用Where子句

[HasMany(typeof(ThemeInfo), Table = "ThemeInfo", ColumnKey = "UserID", Lazy = true, Cascade = ManyRelationCascadeEnum.Delete,Where="UserID=1")]public virtual IList<ThemeInfo> AdultThemeInfos { get; set; }

　　查詢(xún)所有UserID等于1的用戶(hù) 發(fā)布的主題信息。Where中的條件語(yǔ)句須是表【Table="ThemeInfo"】中的字段名，不是屬性名稱(chēng)。

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轉(zhuǎn)載于:https://www.cnblogs.com/xsj1989/p/5310432.html

總結(jié)

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