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一、延迟加载
//用户发布的主题，一对多；Table：外键表；ColumnKey：外键；Lazy：延迟加载；Cascade：级联操作（级联删除） [HasMany(typeof(ThemeInfo), Table = "ThemeInfo", ColumnKey = "UserID", Lazy = true, Cascade = ManyRelationCascadeEnum.Delete)] public virtual IList<ThemeInfo> ThemeInfos { get; set; }
Lazy=true，当需要用到的时候才会自动读取，用法：
//延迟加载，必须使用 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("编号：" + item.ID + " 名称：" + item.Name + "<br />"); htmlStr1.Append(" 我的主题：<br />"); foreach (Models.ThemeInfo item2 in item.ThemeInfos) { htmlStr1.Append(" 编号：" + item2.ID + " 名称：" + 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("编号：" + item.ID + " 名称：" + item.Name + "<br />"); htmlStr2.Append(" 我的主题：<br />"); foreach (Models.ThemeInfo item2 in item.ThemeInfos) { htmlStr2.Append(" 编号：" + item2.ID + " 名称：" + item2.Subject + "<br />"); } } Literal2.Text = htmlStr2.ToString(); Literal3.Text = PageCount + ""; }
分页查询：
//分页获取数据
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);//设置从哪一条开始
ScalarQuery squery = new ScalarQuery(typeof(UserInfo), "select Count(*) from UserInfo");
int recordCount = Convert.ToInt32(ExecuteQuery(squery));//获得总条数
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; }
查询所有UserID等于1的用户 发布的主题信息。Where中的条件语句须是表【Table="ThemeInfo"】中的字段名，不是属性名称。
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原文地址：http://www.cnblogs.com/xsj1989/p/5310432.html
