SQL ntext字段应该如何替换呢?可以通过convert字段转换,把SQL ntext字段转换为varchar(8000),然后用Relpace函数替换,不过,此方法,对于字段长度大于8000的ntext字段无效,下面这种方法正好可以解决这个问题,供您参考。
- CREATE procedure [dbo].[Proc_UpdateNTextField]
- @TargetTable nvarchar(1000), --目标表名
- @TargetField nvarchar(1000), --目标字段名
- @PKField nvarchar(1000), --该表主键字段名
- @otxt nvarchar(1000), --需要替换的字符串
- @ntxt nvarchar(1000) --替换后的字符串
- as
- begin
- declare @SqlStr nvarchar(4000)
- set @SqlStr = ' declare @txtlen int '
- set @SqlStr = @SqlStr + ' set @txtlen = len(''' + @otxt + ''') '
- set @SqlStr = @SqlStr + ' declare @pos int '
- set @SqlStr = @SqlStr + ' set @pos = 0 '
- set @SqlStr = @SqlStr + 'declare curs cursor local fast_forward for select '
- set @SqlStr = @SqlStr + @PKField + ' , textptr(' + @TargetField +') from ' + @TargetTable +' where ' + @TargetField + ' like ''%' + @otxt +'%'''
- set @SqlStr = @SqlStr + ' declare @ptr binary(16) '
- set @SqlStr = @SqlStr + ' declare @id char(32) '
- set @SqlStr = @SqlStr + ' open curs '
- set @SqlStr = @SqlStr + ' fetch next from curs into @id, @ptr '
- set @SqlStr = @SqlStr + ' while @@fetch_status = 0 '
- set @SqlStr = @SqlStr + ' begin '
- set @SqlStr = @SqlStr + ' select @pos= patindex(''%' + @otxt + '%'',ProductDesc) from ProductTemp where ProductID=@id '
- set @SqlStr = @SqlStr + ' while @pos>0 '
- set @SqlStr = @SqlStr + ' begin '
- set @SqlStr = @SqlStr + ' set @pos=@pos-1 '
- set @SqlStr = @SqlStr + ' updatetext ' + @TargetTable + '.' +@TargetField + ' @ptr @pos @txtlen ''' + @ntxt + ''' '
- set @SqlStr = @SqlStr + ' select @pos= patindex(''%' + @otxt + '%'',ProductDesc) from ProductTemp where ProductID=@id '
- set @SqlStr = @SqlStr + ' end '
- set @SqlStr = @SqlStr + ' fetch next from curs into @id, @ptr '
- set @SqlStr = @SqlStr + ' end '
- set @SqlStr = @SqlStr + ' close curs '
- set @SqlStr = @SqlStr + ' deallocate curs '
- EXECUTE sp_executesql @SqlStr
- end
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