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  • 生成查询的模糊匹配字符串.sql

    if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[f_Sql]') and xtype in (N'FN', N'IF', N'TF'))
    drop function [dbo].[f_Sql]
    GO

    if exists (select * from dbo.sysobjects where id = object_id(N'[序数表]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
    drop table [序数表]
    GO

    --为了效率,所以要一个辅助表配合
    select top 1000 id=identity(int,1,1) into 序数表
    from syscolumns a,syscolumns b
    alter table 序数表 add constraint pk_id_序数表 primary key(id)
    go

    /*--根据指定字符串生成查询的模糊匹配字符串

     条件连接的关键字为 and,or
     可以任意指定括号
     生成的条件表达式为 like 模糊匹配

    --邹建 2004.08(引用请保留此信息)--*/

    /*--调用示例

     --调用示例
     select A=dbo.f_Sql('(Web or HTML or Internet) and (Programmer or Developer)','content')
     select B=dbo.f_Sql('Web or HTML or Internet','content')
     select C=dbo.f_Sql('(Web and HTML)','content')
     select D=dbo.f_Sql('Web','content')
    --*/
    --示例函数
    create function f_Sql(
    @str Nvarchar(1000), --要检索的字符串
    @fdname sysname --在那个字段中检索
    )returns Nvarchar(4000)
    as
    begin
     declare @r Nvarchar(4000)
     set @r=''
     select @r=@r+case
      when substring(@str,id,charindex(' ',@str+' ',id)-id) in('or','and')
       then ' '+substring(@str,id,charindex(' ',@str+' ',id)-id)+' '
      when substring(@str,id,1)='('
       then '(['+@fdname+'] like ''%'
        +substring(@str,id+1,charindex(' ',@str+' ',id)-id-1)
        +'%'''
      when substring(@str,charindex(' ',@str+' ',id)-1,1)=')'
       then '['+@fdname+'] like ''%'
        +substring(@str,id,charindex(' ',@str+' ',id)-id-1)
        +'%'')'
      else '['+@fdname+'] like ''%'
       +substring(@str,id,charindex(' ',@str+' ',id)-id)
       +'%'''
      end
     from 序数表
     where id<=len(@str)
      and charindex(' ',' '+@str,id)-id=0
     return(@r)
    end
    go


     

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  • 原文地址:https://www.cnblogs.com/dushu/p/2509050.html
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