41 lines
815 B
MySQL
41 lines
815 B
MySQL
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/****** Object: UserDefinedFunction [dbo].[Find_In_Set] Script Date: 08/13/2025 12:30:04 ******/
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SET ANSI_NULLS ON
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GO
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SET QUOTED_IDENTIFIER ON
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GO
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-- 创建自定义函数
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create FUNCTION [dbo].[Find_In_Set] (@str NVARCHAR(255), @strlist NVARCHAR(MAX))
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RETURNS INT
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AS
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BEGIN
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DECLARE @pos INT = 1;
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DECLARE @currentStr NVARCHAR(255);
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DECLARE @startPos INT = 1;
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DECLARE @endPos INT;
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WHILE @startPos <= LEN(@strlist)
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BEGIN
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SET @endPos = CHARINDEX(',', @strlist, @startPos);
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IF @endPos = 0
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SET @endPos = LEN(@strlist) + 1;
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SET @currentStr = SUBSTRING(@strlist, @startPos, @endPos - @startPos);
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IF @currentStr = @str
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RETURN @pos;
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SET @startPos = @endPos + 1;
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SET @pos = @pos + 1;
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END;
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RETURN 0;
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END;
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GO
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