IBatis.Net使用总结（三）-- IBatis实现分页返回数据和总数

IBatis 分页,这里没有使用其他插件，只使用最原始的方法。

输入参数：

int　　 currentPage　　当前页

int　　 pageSize　　每页大小

Hashtable 　　findCondition　　查询条件

out　　int 　　total　　返回总数

输出：

DataTable  或者　　IList<T>

使用了三种分页方式，根据实际情况使用。

我在实际应用中，

第一种返回DataTable，在使用过程中，需要注意它所映射的实体对象名称字段。

第二种方法返回泛型集合，使用的比较顺手，也是习惯使用的方法。

第三种方法也是返回泛型集合。但是，它使用的两个参数，偏移量和页面大小，我平常用的概率小点。

1：在一个statements中，使用了两条语句，一个是返回所需的列，一个是返回总数。。

 <select id="Article_FindPageByCond" parameterClass="HashTable" resultClass="System.Data.DataSet" >
       <![CDATA[select
                 T.[PK_Article]
                 ,T.[ArticleTitle]
                 ,T.[ArticleAuthor]
                 ,T.[ArticleSummary]
                 ,T.[ArticleContent]
                 ,T.[Sort]
                 ,T.[EditTime]
                 ,T.[Dr]
                 ,T.[Ts]
           from
           ( select A.*, ROW_NUMBER() OVER ( ORDER BY
                  (A.[PK_Article] )
                   ) rn
               from
               (select *  from [dbo].[Article]]]>
                   <dynamic prepend="WHERE">
                     <isNotEmpty prepend="and" property="PKArticle">
                         PKArticle LIKE '%'+#PKArticle#+'%'
                     </isNotEmpty>
                     <isNotEmpty prepend="and" property="ArticleTitle">
                         ArticleTitle LIKE '%'+#ArticleTitle#+'%'
                     </isNotEmpty>
                     <isNotEmpty prepend="and" property="ArticleAuthor">
                         ArticleAuthor LIKE '%'+#ArticleAuthor#+'%'
                     </isNotEmpty>
                     <isNotEmpty prepend="and" property="ArticleSummary">
                         ArticleSummary LIKE '%'+#ArticleSummary#+'%'
                     </isNotEmpty>
                     <isNotEmpty prepend="and" property="ArticleContent">
                         ArticleContent LIKE '%'+#ArticleContent#+'%'
                     </isNotEmpty>
                     <isNotNull property="Sort">
                         <isNotEmpty property="Sort">
                             <isNotEqual prepend="and" property="Sort" compareValue="0">
                                 Sort LIKE '%'+#Sort#+'%'
                             </isNotEqual>
                         </isNotEmpty>
                     </isNotNull>
                     <isNotEmpty prepend="and" property="EditTime">
                         EditTime LIKE '%'+#EditTime#+'%'
                     </isNotEmpty>
                     <isNotEmpty prepend="and" property="Dr">
                         Dr LIKE '%'+#Dr#+'%'
                     </isNotEmpty>
                     <isNotEmpty prepend="and" property="Ts">
                         Ts LIKE '%'+#Ts#+'%'
                     </isNotEmpty>
                 </dynamic>
               ) A
           ) T
           where 1=1 and
           <![CDATA[  rn <= #currentPage# * #pageSize# ]]>
           and  <![CDATA[ rn >(#currentPage# - 1) * #pageSize# ]]>

           <![CDATA[
            select count(*) as total
           from
           ( select A.*, ROW_NUMBER() OVER ( ORDER BY
                  (A.[PK_Article] )
                   ) rn
               from
               (select *  from [dbo].[Article]]]>
                   <dynamic prepend="WHERE">
                     <isNotEmpty prepend="and" property="PKArticle">
                         PKArticle LIKE '%'+#PKArticle#+'%'
                     </isNotEmpty>
                     <isNotEmpty prepend="and" property="ArticleTitle">
                         ArticleTitle LIKE '%'+#ArticleTitle#+'%'
                     </isNotEmpty>
                     <isNotEmpty prepend="and" property="ArticleAuthor">
                         ArticleAuthor LIKE '%'+#ArticleAuthor#+'%'
                     </isNotEmpty>
                     <isNotEmpty prepend="and" property="ArticleSummary">
                         ArticleSummary LIKE '%'+#ArticleSummary#+'%'
                     </isNotEmpty>
                     <isNotEmpty prepend="and" property="ArticleContent">
                         ArticleContent LIKE '%'+#ArticleContent#+'%'
                     </isNotEmpty>
                     <isNotNull property="Sort">
                         <isNotEmpty property="Sort">
                             <isNotEqual prepend="and" property="Sort" compareValue="0">
                                 Sort LIKE '%'+#Sort#+'%'
                             </isNotEqual>
                         </isNotEmpty>
                     </isNotNull>
                     <isNotEmpty prepend="and" property="EditTime">
                         EditTime LIKE '%'+#EditTime#+'%'
                     </isNotEmpty>
                     <isNotEmpty prepend="and" property="Dr">
                         Dr LIKE '%'+#Dr#+'%'
                     </isNotEmpty>
                     <isNotEmpty prepend="and" property="Ts">
                         Ts LIKE '%'+#Ts#+'%'
                     </isNotEmpty>
                 </dynamic>
               ) A
           ) T
     </select>

返回所需列，返回总数

这种方式，调用前面所说的返回DataTable的方法，完成分页

        /// <summary>
         /// 按条件获取分页数据，返回DataTable对象
         /// </summary>
         /// <param name="currentPage"></param>
         /// <param name="pageSize"></param>
         /// <param name="findCondtion"></param>
         /// <param name="total"></param>
         /// <returns></returns>
         public DataTable FindPageByCondition(int currentPage, int pageSize, Hashtable findCondition, out int total)
         {
             String stmtId = "Article_FindPageByCond";
             total = ;
             findCondition.Add("currentPage", currentPage);
             findCondition.Add("pageSize", pageSize);
             BaseDao bd = new BaseDao();
             DataSet ds = bd.QueryForDataSet(stmtId, findCondition);
             DataTable dt = ds.Tables[];
             total = Convert.ToInt32(ds.Tables[].Rows[][].ToString());
             return dt;
         }
         

使用BaseDao.cs返回分页之后的DataTable

2：如果想要返回泛型集合IList<T>，则使用两个statements。一个select返回实体映射，一个select返回总数。

     <select id="Article_GetPageByCond" parameterClass="HashTable" resultMap="FullResultMap" >
       <![CDATA[select
                 T.[PK_Article]
                 ,T.[ArticleTitle]
                 ,T.[ArticleAuthor]
                 ,T.[ArticleSummary]
                 ,T.[ArticleContent]
                 ,T.[Sort]
                 ,T.[EditTime]
                 ,T.[Dr]
                 ,T.[Ts]
           from
           ( select A.*, ROW_NUMBER() OVER ( ORDER BY
                  (A.[PK_Article] )
                   ) rn
           from
           (select *  from [dbo].[Article]]]>
               <dynamic prepend="WHERE">
                 <isNotEmpty prepend="and" property="PKArticle">
                     PKArticle LIKE '%'+#PKArticle#+'%'
                 </isNotEmpty>
                 <isNotEmpty prepend="and" property="ArticleTitle">
                     ArticleTitle LIKE '%'+#ArticleTitle#+'%'
                 </isNotEmpty>
                 <isNotEmpty prepend="and" property="ArticleAuthor">
                     ArticleAuthor LIKE '%'+#ArticleAuthor#+'%'
                 </isNotEmpty>
                 <isNotEmpty prepend="and" property="ArticleSummary">
                     ArticleSummary LIKE '%'+#ArticleSummary#+'%'
                 </isNotEmpty>
                 <isNotEmpty prepend="and" property="ArticleContent">
                     ArticleContent LIKE '%'+#ArticleContent#+'%'
                 </isNotEmpty>
                 <isNotNull property="Sort">
                     <isNotEmpty property="Sort">
                         <isNotEqual prepend="and" property="Sort" compareValue="0">
                             Sort LIKE '%'+#Sort#+'%'
                         </isNotEqual>
                     </isNotEmpty>
                 </isNotNull>
                 <isNotEmpty prepend="and" property="EditTime">
                     EditTime LIKE '%'+#EditTime#+'%'
                 </isNotEmpty>
                 <isNotEmpty prepend="and" property="Dr">
                     Dr LIKE '%'+#Dr#+'%'
                 </isNotEmpty>
                 <isNotEmpty prepend="and" property="Ts">
                     Ts LIKE '%'+#Ts#+'%'
                 </isNotEmpty>
             </dynamic>
           ) A
           ) T
           where 1=1 and
           <![CDATA[  rn <= #currentPage# * #pageSize# ]]>
           and  <![CDATA[ rn >(#currentPage# - 1) * #pageSize# ]]>
     </select>

返回映射FullResultMap

 <select id="Article_GetCountByCond" resultClass="System.Int32">
         <![CDATA[
        SELECT count(*) as total
       FROM
       ( select A.*, ROW_NUMBER() OVER ( ORDER BY
              (A.[PK_Article] )
               ) rn
       from
       (SELECT *  FROM [dbo].[Article]]]>
       <dynamic prepend="WHERE">
         <isNotEmpty prepend="and" property="PKArticle">
             PKArticle LIKE '%'+#PKArticle#+'%'
         </isNotEmpty>
         <isNotEmpty prepend="and" property="ArticleTitle">
             ArticleTitle LIKE '%'+#ArticleTitle#+'%'
         </isNotEmpty>
         <isNotEmpty prepend="and" property="ArticleAuthor">
             ArticleAuthor LIKE '%'+#ArticleAuthor#+'%'
         </isNotEmpty>
         <isNotEmpty prepend="and" property="ArticleSummary">
             ArticleSummary LIKE '%'+#ArticleSummary#+'%'
         </isNotEmpty>
         <isNotEmpty prepend="and" property="ArticleContent">
             ArticleContent LIKE '%'+#ArticleContent#+'%'
         </isNotEmpty>
         <isNotNull property="Sort">
             <isNotEmpty property="Sort">
                 <isNotEqual prepend="and" property="Sort" compareValue="0">
                     Sort LIKE '%'+#Sort#+'%'
                 </isNotEqual>
             </isNotEmpty>
         </isNotNull>
         <isNotEmpty prepend="and" property="EditTime">
             EditTime LIKE '%'+#EditTime#+'%'
         </isNotEmpty>
         <isNotEmpty prepend="and" property="Dr">
             Dr LIKE '%'+#Dr#+'%'
         </isNotEmpty>
         <isNotEmpty prepend="and" property="Ts">
             Ts LIKE '%'+#Ts#+'%'
         </isNotEmpty>
     </dynamic>
       ) A
       ) T
     </select>

返回总数

使用IList<T> QueryForList<T>(string statementName, object parameterObject);

         /// <summary>
         /// 按条件获取分页数据,返回IList对象
         /// </summary>
         /// <param name="currentPage"></param>
         /// <param name="pageSize"></param>
         /// <param name="findCondtion"></param>
         /// <param name="total"></param>
         /// <returns></returns>
         public IList<Article> GetPageByCondition(int currentPage, int pageSize, Hashtable findCondition)
         {
             IList<Article> list=new List<Article>();
             String stmtId = "Article_GetPageByCond";
             findCondition.Add("currentPage", currentPage);
             findCondition.Add("pageSize", pageSize);
             IList<Article> result = SqlMap.QueryForList<Article>(stmtId,findCondition);
             return result;
         }      

分页返回IList对象

3：使用ibatis.net本身自带的分页功能。

int　skipResults　　偏移量

int maxResults　　每页大小(偏移量之后的页面大小）

statements还是使用了第2种方法，两个statements

IList<T> QueryForList<T>(string statementName, object parameterObject, int skipResults, int maxResults);
IList QueryForList(string statementName, object parameterObject, int skipResults, int maxResults);

 public IList GetPage(int skipResults, int maxResults, Hashtable findCondition)
         {
             String stmtId = "Article_GetPageByCond";
             IList result = SqlMap.QueryForList(stmtId, findCondition, skipResults, maxResults);
             return result;
         }

使用自带的分页功能