Passing SQL stored procedure entirety of WHERE clause

Question

I have a SQL stored procedure of the form

SELECT [fields] FROM [table] WHERE @whereSql

I want to pass the procedure an argument (@whereSql)

Answer 1

Dynamic SQL listed in some of the Answers is definitely a solution. However, if Dynamic SQL needs to be avoided, one of the solutions that I prefer is to make use of table variables (or temp tables) to store the parameter value that is used for comparison in WHERE clause.

Here is an example Stored Procedure implementation.

CREATE PROCEDURE [dbo].[myStoredProc]
@parameter1 varchar(50)
AS

declare  @myTempTableVar Table(param1 varchar(50))
insert into @myTempTableVar values(@parameter1)

select * from MyTable where MyColumn in (select param1 from @myTempTableVar)

GO

In case you want to pass in multiple values, then the comma separated values can be stored as rows in the table variable and used in the same way for comparison.

CREATE PROCEDURE [dbo].[myStoredProc]
@parameter1 varchar(50)
AS

--Code Block to Convert Comma Seperated Parameter into Values of a Temporary Table Variable
declare  @myTempTableVar Table(param1 varchar(50))
declare @index int =0, @tempString varchar(10)

if charindex(',',@parameter1) > 0
begin
 set @index = charindex(',',@parameter1)
 while @index > 0
  begin
    set @tempString = SubString(@parameter1,1,@index-1)
    insert into @myTempTableVar values (@tempString)
    set @parameter1 = SubString(@parameter1,@index+1,len(@parameter1)-@index)
    set @index = charindex(',',@parameter1)
  end

  set @tempString = @parameter1
  insert into @myTempTableVar values (@tempString)
end
else
insert into @myTempTableVar values (@parameter1)

select * from MyTable where MyColumn in (select param1 from @myTempTableVar)

GO