SQL2005增加了不少新特性,其中NTILE和ROW_NUMER使得我们不再为SQL如何灵活方便的分页伤脑筋了(不必再羡慕Oracle等数据库了)。 下面就是一个很简单的分页查询语句: DECLARE @rows_per_page AS INTEGER DECLARE @current_page AS INTEGER DECLARE @total_pages AS INTEGER -- 设置每页的行数 SET @rows_per_page = 20 -- 设置要显示的页号(从1开始) SET @current_page = 2 -- 计算总页数 SELECT @total_pages = COUNT(*) / @rows_per_page FROM testtable; -- 列出指定页的内容 WITH t AS ( SELECT NTILE(@total_pages) OVER(ORDER BY id) AS page_number, * FROM testtable ) SELECT * from t WHERE page_number = @current_page 程序简单到可以不用说明的程度。 我们可以利用上述简单的语句,变化排序条件和查询表,就可以做出一个很通用的分页查询的存储过程或查询语句了。 同样的,使用ROW_NUMBER也可以做到分页查询: DECLARE @rows_per_page AS INTEGER DECLARE @current_page AS INTEGER DECLARE @start_row_num AS INTEGER -- 设置每页的行数 SET @rows_per_page = 20 -- 设置要显示的页号(从1开始) SET @current_page = 2 -- 设置开始行号 SET @start_row_num = (@current_page - 1) * @rows_per_page WITH t AS ( SELECT ROW_NUMBER() OVER(ORDER BY id) AS row_number, * FROM testtable ) SELECT * from t WHERE row_number BETWEEN @start_row_num AND @start_row_num + @rows_per_page 似乎更简单的样子。 至于哪种效率更高,这需要大家实际测试了。 |
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