沒有任何一個知道爲什麼我仍然得到0的結果:CHARINDEX回頭率0
SELECT [KnowItAll].[dbo].[VSM_CanculateTermFrequency] (
'hello hi hello by hello why'
,'hi')
GO
其中VSM_CanculateTermFrequency:
CREATE FUNCTION [dbo].[VSM_CanculateTermFrequency]
(
@i_Document NCHAR(4000),
@i_Term NCHAR(30)
)
RETURNS SMALLINT
AS
BEGIN
-- Declare the return variable here
DECLARE @TermFrequency SMALLINT
DECLARE @pos INT
DECLARE @nextpos INT
SELECT @pos = 0, @nextpos = 1, @TermFrequency = 0
WHILE @nextpos > 0
BEGIN
SELECT @nextpos = CHARINDEX(@i_Term,@i_Document)
SELECT @TermFrequency = CASE
WHEN @nextpos > 0 THEN @TermFrequency + 1
ELSE @TermFrequency
END
SELECT @pos = @nextpos
END
RETURN @TermFrequency
END
+1 - 填充是問題 – Andrew 2011-05-08 17:02:20