SQL 高效的万能分页语句

Posted 2020-11-07 null

代码如下：

USE [Blog]
IF OBJECT_ID(‘Proc_Paging‘, ‘P‘) IS NOT NULL    --删除同名存储过程
    DROP PROC Proc_Paging
GO
CREATE PROC Proc_Paging
    @TableFields NVARCHAR(512),
    @TableName NVARCHAR(512),
    @SqlWhere NVARCHAR(512),
    @OrderBy NVARCHAR(64),
    @PageIndex INT,
    @PageSize INT,
    @TotalCount INT OUTPUT
AS
    DECLARE @SQL1 NVARCHAR(2048), @SQL2 NVARCHAR(2048)    --@SQL1和@SQL2最好设置为比较长的字符串，否则会因为SQL语句过长而导致执行失败
    --SET @SQL1 = N‘SELECT TOP ‘ + CONVERT(VARCHAR(2), @PageSize) + ‘ * FROM (SELECT ROW_NUMBER() OVER(ORDER BY ‘ + @OrderBy + ‘) AS NID, ‘ + @TableFields + ‘ FROM ‘ + @TableName + ‘ WHERE ‘ + @SqlWhere + ‘) AS TmpTable WHERE TmpTable.NID > (@PageIndex - 1) * @PageSize‘  --用TOP关键字进行筛选
    SET @SQL1 = N‘SELECT * FROM (SELECT ROW_NUMBER() OVER(ORDER BY ‘ + @OrderBy + ‘) AS NID, ‘ + @TableFields + ‘ FROM ‘ + @TableName + ‘ WHERE ‘ + @SqlWhere + ‘) AS TmpTable WHERE TmpTable.NID BETWEEN (@PageIndex - 1) * @PageSize + 1 AND @PageIndex* @PageSize‘
    SET @SQL2 = N‘@TableFields NVARCHAR(512),@TableName NVARCHAR(512),@SqlWhere NVARCHAR(512),@OrderBy NVARCHAR(64),@PageIndex INT,@PageSize INT,@TotalCount INT OUTPUT‘
EXEC SP_EXECUTESQL @SQL1, @SQL2, @TableFields, @TableName, @SqlWhere,@OrderBy,@PageIndex,@PageSize,@TotalCount OUTPUT
PRINT @SQL1    --打印执行语句  

GO    --测试用例
DECLARE @Count INT = 0
EXEC Proc_Paging ‘*‘, ‘POSTS‘, ‘PublishTime < GETDATE()‘, ‘Id‘, 5, 10, @Count OUTPUT    --筛选发布时间小于当前时间的记录

【注意点】：@SQL1和@SQL2最好设置为比较长的字符串，否则会因为SQL语句过长而导致执行失败