此文讲述mvc4+entityframework6+sqlserver2008环境下调用存储过程，实现分页。
1、分页存储过程代码如下：
分页原理用的row_number()和over()函数实现（没有用top、not in，因为性能低）。
SET QUOTED_IDENTIFIER ON
GO
CREATE PROCEDURE [dbo].[Procedure_SpiltPage]
(
@pageIndex INT =1, --页索引
@pageSize INT =10, --页大小
@tableName NVARCHAR(100), --表名
@fieldName NVARCHAR(200) =‘*‘, --查询字段
@whereCondition NVARCHAR(800) =‘1=1‘, --where条件
@orderCondition NVARCHAR(200), --order条件
@recordTotal INT OUTPUT, --输出记录总数
@pageCount INT OUTPUT --输出分页数
)
AS
BEGIN
DECLARE @sqlStr NVARCHAR(1000);
SET NOCOUNT ON; --不返回计数
--返回记录总数
SET @sqlStr = ‘SELECT @recordTotal = COUNT(*) FROM ‘+@tableName+‘ WHERE ‘+@whereCondition
EXEC sp_executesql @sqlStr,N‘@recordTotal INT OUTPUT‘,@recordTotal OUTPUT
SET @pageCount=(@recordTotal+@pageSize-1)/@pageSize
--查询列表
--如果是第一页
IF (@pageIndex<=1)
BEGIN
--N‘表示强制转换为Unicode字符,不会乱码
SET @sqlStr=N‘SELECT TOP ‘+CAST(@pageSize AS VARCHAR)+‘ ‘+@fieldName+‘ FROM ‘+@tableName+‘ WHERE ‘+@whereCondition+‘ ORDER BY ‘+@orderCondition
END
ELSE
BEGIN
SET @sqlStr=N‘SELECT ‘+@fieldName+‘ FROM (SELECT ROW_NUMBER() OVER(ORDER BY ‘+@orderCondition+‘) AS rownum, ‘
+@fieldName+‘ FROM ‘+@tableName+‘ WHERE ‘+@whereCondition+‘) AS myTable WHERE rownum BETWEEN ‘
+CAST(((@pageIndex-1)*@pageSize+1) AS NVARCHAR)+‘ AND ‘+CAST((@pageIndex*@pageSize) AS NVARCHAR)
END
EXEC (@sqlStr)
SET NOCOUNT OFF;
END
GO
在数据库中测试，可以如下：
declare @total int declare @pageCount int exec Procedure_SpiltPage 1,15,‘NewsInfo‘,‘*‘,‘1=1‘,‘PostTime desc‘,@total output,@pageCount output select @total as total,@pageCount as pageCounts
执行测试代码
2、分页实现代码：
2.1、分页信息类如下：
namespace WebUI.PageinationService
{
/// <summary>
/// 分页信息类
/// </summary>
public class PageinationInfo
{
/// <summary>
/// 页索引
/// </summary>
public int PageIndex { get; set; }
/// <summary>
/// 页大小
/// </summary>
public int PageSize { get; set; }
/// <summary>
/// 总数
/// </summary>
public int TotalCount { get; set; }
/// <summary>
/// 总页数
/// </summary>
public int TotalPages { get; set; }
/// <summary>
/// 表名
/// </summary>
public string TableName { get; set; }
/// <summary>
/// 主键
/// </summary>
public string KeyName { get; set; }
/// <summary>
/// 查询字段
/// </summary>
public string FieldName { get; set; }
/// <summary>
/// where条件（不带‘where‘）
/// </summary>
public string WhereCondition { get; set; }
/// <summary>
/// 排序条件，如：id desc ，或者：id desc,name asc
/// </summary>
public string OrderCondition { get; set; }
}
}
分页信息类
2.2、分页数据类（用以返回）
namespace WebUI.PageinationService
{
/// <summary>
/// 分页数据类
/// 用以将分页集合和总数，总页数等打包一起返回
/// </summary>
public class PageinationData
{
/// <summary>
/// 总数
/// </summary>
public int TotalCount { get; set; }
/// <summary>
/// 总页数
/// </summary>
public int TotalPages { get; set; }
/// <summary>
/// 集合
/// </summary>
public dynamic DataList { get; set; }
}
}
分页数据类
2.3、分页实现类：
namespace WebUI.PageinationService
{
/// <summary>
/// 分页读取数据的实现类
/// </summary>
public class PageinationImplement
{
//数据库上下文实例
private MyDbContext db;
public PageinationImplement(MyDbContext dbContext)
{
this.db = dbContext;
}
/// <summary>
/// 读取分页数据
/// </summary>
/// <typeparam name="T">实体</typeparam>
/// <param name="pageinationInfo">分页信息类</param>
/// <returns>分页数据</returns>
public PageinationData GetPageinationData<T>(PageinationInfo pageinationInfo) where T : class
{
dynamic result = null;
try
{
#region SqlParameter参数
SqlParameter[] paras = new SqlParameter[8];
//页索引
paras[0] = new SqlParameter("pageIndex", DbType.Int32);
paras[0].Value = pageinationInfo.PageIndex;
//页大小
paras[1] = new SqlParameter("pageSize", DbType.Int32);
paras[1].Value = pageinationInfo.PageSize;
//表名
paras[2] = new SqlParameter("tableName", DbType.String);
paras[2].Value = pageinationInfo.TableName;
//查询字段
//EF仅支持返回返回某个表的全部字段，以便转换成对应的实体，无法支持返回部分字段的情况...？？？
paras[3] = new SqlParameter("fieldName", DbType.String);
paras[3].Value = pageinationInfo.FieldName;
//where条件
paras[4] = new SqlParameter("whereCondition", DbType.String);
paras[4].Value = pageinationInfo.WhereCondition;
//order条件
paras[5] = new SqlParameter("orderCondition", DbType.String);
paras[5].Value = pageinationInfo.OrderCondition;
//总数
paras[6] = new SqlParameter("totalCount", DbType.Int32);
paras[6].Value = pageinationInfo.TotalCount;
paras[6].Direction = ParameterDirection.Output;
//总页数
paras[7] = new SqlParameter("totalPages", DbType.Int32);
paras[7].Value = pageinationInfo.TotalPages;
paras[7].Direction = ParameterDirection.Output;
#endregion
string sql = "Procedure_SpiltPage @pageIndex,@pageSize,@tableName,@fieldName,@whereCondition,@orderCondition,@totalCount output,@totalPages output";
var list = db.Database.SqlQuery<T>(sql, paras).ToList();
PageinationData data = new PageinationData();
data.TotalCount= (int)paras[6].Value;
data.TotalPages= (int)paras[7].Value;
data.DataList = list;
result = data;
}
catch(Exception e)
{
throw;
}
return result;
}
}
}
分页实现类
3、调用并返回数据：
PageinationImplement pageImpl = new PageinationImplement(db); PageinationInfo pageination = new PageinationInfo(); pageination.TableName = "NewsInfo"; pageination.PageIndex = 1; pageination.PageSize = 15; pageination.FieldName = "*"; pageination.OrderCondition = "PostTime desc"; pageination.WhereCondition = "Isdelete=0"; var data = pageImpl.GetPageinationData<NewsInfo>(pageination);
上面的new PageinationImplement(db)中的db是数据库上下文（DbContext实例），
上面的data里包括了分页列表，总记录数，分页页数 信息。
注：本来我执行存储过程，想只查询表的部分字段，结果会报错，暂时只能用*查询所有字段，
网上查说EF暂时仅支持返回返回某个表的全部字段，以便转换成对应的实体，无法支持返回部分字段的情况...不知道有没有方法可以实现，
各位大神如果有方法的话，希望指教一下，谢谢！
时间： 2024-11-05 23:37:44