MS SQL 分页存储过程

Posted 2020-11-07 witeem

最近换了家新公司，但是新公司没有使用分页的存储过程。哎~~,硬着头皮自己尝试写了一个，别说还挺好用的。（效率怎么样就不怎么清除没有详细的测试过）

CREATE PROCEDURE [dbo].[pro_common_pageList]
    (
      @tab NVARCHAR(MAX) ,---表名
      @PrimaryKey VARCHAR(100) , --主键ID
      @strFld NVARCHAR(MAX) , --字段字符串
      @strWhere NVARCHAR(MAX) = ‘ ‘ , --where条件 
      @IsDistinct BIT ,
      @PageIndex INT , --页码
      @PageSize INT , --每页容纳的记录数
      @Order VARCHAR(255) = ‘ ‘ , --排序字段及规则,不用加order by
      @Sort VARCHAR(20) = ‘desc‘ ,
      @TotalCount INT OUTPUT  --总记录数
    )
AS
    BEGIN
        SET NOCOUNT ON;
        DECLARE @strSql VARCHAR(MAX);
        IF @strFld IS NULL
            OR @strFld = ‘ ‘
            BEGIN 
                SET @strFld = ‘*‘;
            END;  
        IF @Order IS NULL
            OR @Order = ‘ ‘
            BEGIN 
                SET @Order = @PrimaryKey;
            END; 
--计算总记录数
        DECLARE @sqlRecordCount NVARCHAR(MAX); --得到总记录条数的语句
        DECLARE @recordCount INT; --保存总记录条数的变量
        DECLARE @distinct NVARCHAR(20)= ‘ ‘;
        IF @IsDistinct = 1
            BEGIN 
                SET @distinct = ‘ DISTINCT ‘;
            END; 
        SET @sqlRecordCount = N‘SELECT @recordCount=COUNT(1) FROM (SELECT ‘
            + @distinct + ‘ ‘ + @strFld + ‘ FROM ‘ + @tab + ‘ WHERE 1=1 ‘
            + @strWhere + ‘ ) AS TEMPTABLE‘;
        EXEC sp_executesql @sqlRecordCount, N‘@recordCount int output‘,
            @recordCount OUTPUT;
        SET @TotalCount = @recordCount;

--数据查询
--当@PageIndex=1，使用TOP效率较快
        IF @PageIndex = 1
            BEGIN 
                SET @strSql = ‘SELECT ‘ + @distinct + ‘ TOP ‘ + STR(@PageSize)
                    + ‘ ‘ + @strFld + ‘,0 AS rownum FROM ‘ + @tab
                    + ‘ WHERE 1=1 ‘ + @strWhere + ‘ ORDER BY ‘ + @Order + ‘ ‘
                    + @Sort;
            END; 
        ELSE
            BEGIN  
                SET @strSql = ‘SELECT * FROM (SELECT *, ROW_NUMBER() OVER(ORDER BY ‘ + @PrimaryKey
                    + ‘) AS rownum FROM ‘;
--是否去重：1去重
                IF @IsDistinct = 1
                    BEGIN 
                        SET @strSql = @strSql + ‘ (SELECT DISTINCT ‘ + @strFld
                            + ‘ FROM ‘ + @tab + ‘ WHERE 1=1 ‘ + @strWhere
                            + ‘ ) AS S ‘;
                    END;
                ELSE
                    BEGIN 
                        SET @strSql = @strSql + ‘ ‘ + @tab + ‘ WHERE 1=1 ‘
                            + @strWhere;
                    END; 
                SET @strSql = @strSql
                    + ‘) AS Dwhere WHERE Dwhere.rownum BETWEEN ‘
                    + CAST(( ( @PageIndex - 1 ) * @PageSize ) + 1 AS NVARCHAR(20));
                SET @strSql = @strSql + ‘ AND ‘
                    + CAST(( @PageIndex * @PageSize ) AS NVARCHAR(20));
                SET @strSql = @strSql + ‘ ORDER BY ‘ + @Order + ‘ ‘ + @Sort;
            END; 
        PRINT(@strSql)
        EXEC (@strSql);
        SET NOCOUNT OFF;
    END;

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