Question

我将aaa,bbb,ccc传递给@Tag以获取存储过程SearchNewsByTag，并且需要选择至少包含一个相似关键字的所有新闻项（比如'aaa'或' bbb'或'ccc'...）

ALTER PROCEDURE [dbo].[SearchNewsByTag]
    (@PageIndex         int = 0, 
     @PageSize          int = 2147483644,
     @Tag               nvarchar(400) = null,   
     @TotalRecords      int = null OUTPUT)
AS
BEGIN
    DECLARE @PageLowerBound int
    DECLARE @PageUpperBound int 

    SET @PageLowerBound = @PageSize * @PageIndex
    SET @PageUpperBound = @PageLowerBound + @PageSize + 1

    declare @FilteredTags as TagTable

    INSERT INTO @FilteredTags (Tag)
        SELECT data 
        FROM dbo.nop_splitstring_to_table(@Tag, ',')    -- split the input Tag into separate keywords

    SELECT * 
    FROM
        (SELECT 
             ROW_NUMBER() OVER (ORDER BY id) AS RowNum, *  
         FROM News n
         WHERE dbo.HasSimilarTag(@FilteredTags,n.Tags) > 0) p    -- pass the table with a news tag to check 
    WHERE 
        [p].RowNum > @PageLowerBound AND [p].RowNum < @PageUpperBound

和一个标量函数，用于检查新闻是否与其中一个输入关键字（@Tag参数）具有相似的关键字（标记）

ALTER FUNCTION [dbo].[HasSimilarTag]
    (@Tags TagTable READONLY, @TagFromRecord nvarchar(10) = null)
RETURNS int
AS
BEGIN
    DECLARE @name int

    declare @TagsFromRecord as TagTable
    INSERT INTO @TagsFromRecord (Tag)
    SELECT data FROM [nop_splitstring_to_table](dbo.RemoveDauTVCLR(@TagFromRecord), ',')    

    declare @TagsResult as TagTable
    INSERT INTO @TagsResult (Tag)
    SELECT Tag FROM @Tags intersect SELECT Tag from @TagsFromRecord   

    select @name= COUNT(1) from @TagsResult
    RETURN @name
END

一切正常但速度相当慢，通常需要5秒才能完成。新闻表只有大约110k的记录。

缓存存储过程和功能

0 个答案: