Question

My webform contain some checkboxes.If perticular checkbox is checked,add column name into select query of sp.Like
Suppose there are 4 checkbox like chklname,chkfname,chkcity,chkmobile.If I check
chklname and chkfname,my query will be :

SELECT LastName,FirstName FROM table1

How to write that in sp?

Answer 1

CREATE PROCEDURE ProcName
    @chklname bit,
    @chkfname bit,
    @chkcity bit,
    @chkmobile bit
AS
BEGIN
SET NOCOUNT ON;

    --Only execute the statement if at least one of the checkboxes are set
    if @chklname = 1 or @chkfname = 1 or @chkcity =1 or @chkmobile =1 
        begin
        declare @sqlcommand nvarchar(max) 


        set @sqlcommand = N'Select '

        if @chklname = 1
            set @sqlcommand += N'FirstName '

        if @chkfname = 1
        begin
            if len(@sqlcommand) > 1
                set @sqlcommand += N','
            set @sqlcommand += N'LastName '
        end
        if @chkcity = 1
        begin
            if len(@sqlcommand) > 1
                set @sqlcommand += N','
            set @sqlcommand += N'City '
        end
        if @chkmobile = 1
        begin
            if len(@sqlcommand) > 1
                set @sqlcommand += N','
            set @sqlcommand += N'Mobile '
        end

        set @sqlcommand += N' FROM table1'

        exec sp_executesql @statement = @sqlcommand

    end
END
GO