/// <summary>
/// 单表分页数据
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="queryColumns">要查询字段</param>
/// <param name="sortColumn">排序字段</param>
/// <param name="sortType">排序方式</param>
/// <param name="pageSize">每页条数</param>
/// <param name="pageIndex">第几页</param>
/// <param name="whereSql">过滤条件Sql</param>
/// <param name="whereParam">过滤条件字段名及字段值参数,例:new {Uname="joyet",Age = 110}</param>
/// <returns></returns>
public virtual PageResultEntity QueryPageList <T>(string queryColumns, string sortColumn, string sortType, int pageSize, int pageIndex, string whereSql, object whereParam)
{
PageResultEntity result = new PageResultEntity();
if (pageSize <= 0 || pageIndex <= 0)
{
return(result);
}
result.PageSize = pageSize;
result.CurrentPageIndex = pageIndex;
#region 为了分页查询效率，查询第一页时才会查询所有条数
if (result.CurrentPageIndex == 1)
{
var totalPageDbEntity = DbBuilder.QueryTotalPageCount <T>(whereSql, whereParam);
if (totalPageDbEntity == null)
{
return(result);
}
var objTotalCount = DbHelper.ExecuteScalar(totalPageDbEntity.CommandText, totalPageDbEntity.DbParams);
if (objTotalCount == null)
{
return(result);
}
result.TotalCount = Convert.ToInt64(objTotalCount);
if (result.TotalCount <= 0)
{
return(result);
}
}
#endregion
var dbEntity = DbBuilder.QueryPageList <T>(queryColumns, sortColumn, sortType, pageSize, pageIndex, whereSql, whereParam);
if (dbEntity == null)
{
return(result);
}
using (var reader = DbHelper.ExecuteReader(dbEntity.CommandText, dbEntity.DbParams))
{
var datas = DataReaderToEntityList <T>(reader);
result.Data = datas;
result = SetPageListResult <T>(result);
}
HandelExecuteDbCallBack(dbEntity.CommandText, dbEntity.DbParams);
return(result);
}