sql语句

ALTER procedure [dbo].[Sp_QueryFeeInfo]
@feedict varchar(100),
@idnum varchar(20)
as
begin
SET NOCOUNT ON; 
declare @sql nvarchar(4000)
declare @ParameterDefinition nvarchar(4000);

select @ParameterDefinition='@nameParameter varchar(100),@idnumParameter varchar(20)';

select @sql=N'select * from charges where 1=1'
if @feedict is not null
select @sql+=@sql+N' and feedict=@nameParameter';
if @idnum is not null
select @sql+=@sql+N' and idnum=@idnumParameter';

exec sp_executeSQL @sql,@ParameterDefinition,@nameParameter=@feedict,@idnumParameter=@idnum;

end