Castle.ActiveRecord分页示例

Castle.ActiveRecord的分页示例：

分页结果泛型类：

Code
 1namespace EasyNet.Core
 2{
 3    /**//// <summary>
 4    /// 分页结果
 5    /// </summary>
 6    /// <typeparam name="T"></typeparam>
 7    public class PagedResult<T>
 8    {
 9        /**//// <summary>
10        /// 记录总数
11        /// </summary>
12        public int Total { get; set; }
13
14        /**//// <summary>
15        /// 结果数据
16        /// </summary>
17        public T Data { get; set; }
18    }
19}
20

 

文章分类（典型树形结构）：

Code
 1namespace EasyNet.Model
 2{
 3    using System.Collections.Generic;
 4
 5    using NHibernate.Criterion;
 6
 7    using Castle.ActiveRecord;
 8    
 9    [ActiveRecord("site_articlecategory")]
10    public class ArticleCategory : ActiveRecordBase<ArticleCategory>
11    {
12        [PrimaryKey(PrimaryKeyType.Native)]
13        public int Id { get; set; }
14
15        [Property]
16        public string Name { get; set; }
17
18        [Property]
19        public bool ShowInDefault { get; set; }
20
21        [BelongsTo("ParentId")]
22        public ArticleCategory Parent { get; set; }
23
24        [HasMany(typeof(ArticleCategory), "ParentID", "site_articlecategory", Cascade = ManyRelationCascadeEnum.All)]
25        public IList<ArticleCategory> Children { get; set; }
26
27        [Newtonsoft.Json.JsonIgnore]
28        [HasAndBelongsToMany(Table = "site_articleinarticlecategory", ColumnRef = "ArticleId", ColumnKey = "CategoryId", Lazy = true)]
29        public IList<Article> Articles { get; set; }
30
31    }
32}
33

文章实体（定义了一个根据文章分类分页查询，文章与文章分类是多对多的关系）：

Code
 1namespace EasyNet.Model
 2{
 3    using System.Collections.Generic;
 4
 5    using NHibernate.Criterion;
 6
 7    using Castle.ActiveRecord;
 8    using Castle.ActiveRecord.Queries;
 9
10    using Core;
11
12    [ActiveRecord("site_article")]
13    public class Article : ActiveRecordBase<Article>
14    {
15        [PrimaryKey(PrimaryKeyType.Native)]
16        public int Id { get; set; }
17
18        [Property]
19        public string Title { get; set; }
20
21        [Property]
22        public string Content { get; set; }
23
24        [Property]
25        public string Summary { get; set; }
26
27        [Property]
28        public string Author { get; set; }
29
30        [Property]
31        public bool IsNewsPhotos { get; set; }
32
33        [Property]
34        public string PhotoUrl { get; set; }
35
36        [BelongsTo("TemplateId")]
37        public ArticleTemplate Template { get; set; }
38
39        [BelongsTo("CreatorId")]
40        public User Creator { get; set; }
41
42        [BelongsTo("ModifierId")]
43        public User Modifier { get; set; }
44
45        [Property]
46        public bool Published { get; set; }
47
48        [Property]
49        public bool Deleted { get; set; }
50
51        [Property]
52        public long CreatedDatetime { get; set; }
53
54        [Property]
55        public long UpdatedDatetime { get; set; }
56
57        [Newtonsoft.Json.JsonIgnore]
58        [HasAndBelongsToMany(Table = "site_articleinarticlecategory", ColumnRef = "CategoryId", ColumnKey = "ArticleId", Lazy = true)]
59        public IList<ArticleCategory> Categories { get; set; }
60
61        public static PagedResult<Article[]> FindByCategory(int categoryId, int start, int limit)
62        {
63            CountQuery countQuery = new CountQuery(typeof(Article));
64
65            countQuery.SetParameter("Id", categoryId);
66
67            countQuery.Query = "select count(*) from Article as article left join article.Categories as category where category.Id in(:Id)";
68
69            int total = (int)ExecuteQuery(countQuery);
70
71            if (total == 0)
72            {
73                return null;
74            }
75
76            SimpleQuery<Article> query = new SimpleQuery<Article>("select article from Article as article left join article.Categories as category where category.Id in(:Id)");
77
78            query.SetParameter("Id", categoryId);
79            query.SetQueryRange(start, limit);
80
81            Article[] articles = query.Execute();
82
83            PagedResult<Article[]> result = new PagedResult<Article[]>();
84
85            result.Data = articles;
86            result.Total = total;
87
88            return result;
89        }
90    }
91}
92