Dynamic Stored Procedure with View name and Date as parameters - sql

Question

I created a stored procedure which takes a view name and date as parameters and checks if there is record for that date in the view. However, I get the following error
'Operand type clash: date is incompatible with int'.
I am hoping that if the record exists that 1 will be returned else 0 will be returned and I can use that to make a decision in another stored procedure.
The code is listed below
CREATE PROCEDURE [dbo].[usr_RecordExist]
-- Add the parameters for the stored procedure here
#ViewName SYSNAME,
#TransDate Date
--<#Param2, sysname, #p2> <Datatype_For_Param2, , int> = <Default_Value_For_Param2, , 0>
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;
DECLARE #DATEVARCHAR nvarchar(4000);
SET #DATEVARCHAR = CONVERT(NVARCHAR, #TransDate, 103);
-- Insert statements for procedure here
DECLARE #SQLCommand NVARCHAR(MAX) =
N'SELECT COUNT(SYMBOL) FROM ' + QUOTENAME(#ViewName) + 'WHERE TRANSDATE = ' + '' + #DATEVARCHAR + '';
EXECUTE [dbo].[sp_executesql]
#sqlCommand;
END

Answer 1

The expression + '' does nothing, use + '''' to add a single quote.
... + '''' + #DATEVARCHAR + '''';

Answer 2

You are using the right tools but in the wrong way, You should not concatenate parameters but pass them as parameters to the system stored procedure sp_executesql as shown below:
CREATE PROCEDURE [dbo].[usr_RecordExist]
#ViewName SYSNAME,
#TransDate Date
AS
BEGIN
SET NOCOUNT ON;
DECLARE #SQLCommand NVARCHAR(MAX);
SET #SQLCommand = N'SELECT COUNT(SYMBOL) FROM ' + QUOTENAME(#ViewName)
+ N' WHERE TRANSDATE = #TransDate';
EXECUTE [dbo].[sp_executesql] #sqlCommand
,N'#TransDate Date'
,#TransDate
END
Edit
To get the count in an output parameter you would do the following:
CREATE PROCEDURE [dbo].[usr_RecordExist]
#ViewName SYSNAME,
#TransDate Date,
#Count INT OUTPUT
AS
BEGIN
SET NOCOUNT ON;
DECLARE #SQLCommand NVARCHAR(MAX);
SET #SQLCommand = N'SELECT #Count = COUNT(SYMBOL) FROM ' + QUOTENAME(#ViewName)
+ N' WHERE TRANSDATE = #TransDate';
EXECUTE [dbo].[sp_executesql] #sqlCommand
,N'#TransDate Date, #Count INT OUTPUT'
,#TransDate
,#Count OUTPUT
END

Answer 3

Since you used QUOTENAME() for ViewName why not QUOTENAME(#DATEVARCHAR, '''') or QUOTENAME(#DATEVARCHAR, CHAR(39))

Answer 4

Cosmin got it. Although I also noticed you set #DATEVARCHAR to NVARCHAR(4000) even though convert(NVARCHAR without a length defaults to 30.