总结一下SQL中常用的分页方法:
#region SQL2012的分页(返回总记录数)
public static DataSet GetPagingDataSetBySql2012(string tableName, string queryFields, string orderField, int pageIndex, int pageSize, string strWhere, out int totalCount)
{
if (orderField.Trim().Length <= 0)
{
throw new NoNullAllowedException();
}
if (queryFields.Trim().Length <= 0)
{
queryFields = "*";
}
totalCount = 0;
var sql = new StringBuilder();
sql.AppendFormat(" SELECT {0},COUNT(*) OVER(PARTITION BY '') AS Total", queryFields);
sql.AppendFormat(" FROM {0}", tableName);
if (strWhere.Trim().Length > 0)
{
sql.AppendFormat(" WHERE {0}", strWhere);
}
sql.AppendFormat(" ORDER BY {0}", orderField);
sql.AppendFormat(" OFFSET {0} * {1} ROWS", pageIndex, pageSize);
sql.AppendFormat(" FETCH NEXT {0} ROWS ONLY;", pageSize);
var ds = DbHelperSQL.Query(sql.ToString());
if (ds != null && ds.Tables[0].Rows.Count > 0)
{
var c = ds.Tables[0].Columns.Count;
totalCount = Convert.ToInt32(ds.Tables[0].Rows[0][c - 1]);
}
return ds;
}
#endregion
#region SQL2005的分页(返回总记录数)
public static DataSet GetPagingDataSetBySql2005(string tableName, string queryFields, string orderField, int pageIndex, int pageSize, string strWhere, out int totalCount)
{
if (orderField.Trim().Length <= 0)
{
throw new NoNullAllowedException();
}
if (queryFields.Trim().Length <= 0)
{
queryFields = "*";
}
totalCount = 0;
/*
WITH TEMP AS
(
SELECT ROW_NUMBER() OVER(ORDER BY BID) AS TOTAL,* FROM BlogList
)
SELECT * FROM TEMP --WHERE TOTAL BETWEEN 1 AND 5
*/
/*WITH TEMP AS (SELECT ROW_NUMBER() OVER(ORDER BY IsSync DESC, BID) AS TOTAL,* FROM BlogList )SELECT *,(SELECT COUNT(*) FROM TEMP) AS TOTALROWS FROM TEMP WHERE TOTAL BETWEEN 1 AND 2 */
var sql = new StringBuilder();
sql.AppendFormat("WITH TEMP AS (SELECT ROW_NUMBER() OVER(ORDER BY {0}) AS TOTAL,{1} FROM {2}) SELECT *,,(SELECT COUNT(*) FROM TEMP) AS TOTALROWS FROM TEMP ", orderField, queryFields, tableName);
sql.AppendFormat("WHERE TOTAL BETWEEN {0} AND {1}", (pageIndex * pageSize) + 1, pageSize * (pageIndex + 1));
if (strWhere.Trim().Length > 0)
{
sql.AppendFormat(" AND ({0})", strWhere);
}
var ds = DbHelperSQL.Query(sql.ToString());
if (ds != null && ds.Tables[0].Rows.Count > 0)
{
var c = ds.Tables[0].Columns.Count;
totalCount = Convert.ToInt32(ds.Tables[0].Rows[0][c - 1]);
}
return ds;
}
#endregion
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