判断字符串是否为纯数字，负数不算。如'00012','54585','1000'

 

SET ANSI_NULLS ONGOSET QUOTED_IDENTIFIER ONGOCREATE FUNCTION [dbo].[svf_IsNumeric] (  @string NVARCHAR(MAX)) RETURNS BIT  --函数返BIT数据类型，是数字返回1，非数字返回0。ASBEGIN    DECLARE @rtv BIT = 1       DECLARE @str NVARCHAR(MAX) = LTRIM(RTRIM(ISNULL(@string,''))) --去除前后空格，如果为NULL转为''        DECLARE @start INT = 1;     DECLARE @end INT = LEN(@str) --获取字符串长度         WHILE (@start <= @end)  --循环字符串每一个字符    BEGIN        DECLARE @Numeric VARCHAR(1) = ''            SET @Numeric = SUBSTRING(@str, @start, @start + 1) -- 每循环一次，从左边获取一位字符         IF ASCII(@Numeric) >= 48 AND ASCII(@Numeric) <= 57  --如果是数字        BEGIN            SET @start = @start + 1;            CONTINUE  --继续循环            END        ELSE        BEGIN            SET @rtv = 0            BREAK  --跳出循环        END    END        RETURN @rtvEND

 

创建一个例子来演示：

 

CREATE TABLE [dbo].[uTable] ([col1] NVARCHAR(20),[col2] NVARCHAR(20),[col3] NVARCHAR(20),[col4] NVARCHAR(20),[col5] NVARCHAR(20),[col6] NVARCHAR(20),[col7] NVARCHAR(20))GOINSERT INTO [dbo].[uTable] ([col1],[col2],[col3],[col4],[col5],[col6],[col7]) VALUES ('0.455','000435','SF46DG','4000','$%9KJ','-0034','-8554')GOSELECT [dbo].[svf_IsNumeric] ([col1]) AS [col1],[dbo].[svf_IsNumeric] ([col2]) AS [col2],[dbo].[svf_IsNumeric] ([col3]) AS [col3],[dbo].[svf_IsNumeric] ([col4]) AS [col4],[dbo].[svf_IsNumeric] ([col5]) AS [col5],[dbo].[svf_IsNumeric] ([col6]) AS [col6],[dbo].[svf_IsNumeric] ([col7]) AS [col7]FROM [dbo].[uTable] GO