Dynamic SQL Command Queries Using Parameters

Question

Post Author: tdoman
CA Forum: Data Connectivity and SQL
I'm using Crystal Reports 11 and am trying to dynamically build part of the "Where" clause in the SQL command query to filter data on the server before the results are sent to the client. I'm doing this to decrease the load time of my reports by not having to send a large set of data to the client, then filter the results on the client side.
I want to create a parameter list that is dynamically generated from a table in a database and allows you to select mutiple values from that list. For example: I have two tables. One employee table and one employee type table. The employee table lists all employees and their related employee types (full-time, part-time, and contractor). The employee type table lists the employee types that will dynamically be loaded into the parameters list.
Employee Table
ID    Name       TypeID
1     Bob          2
2     Steve        1
3     John         3
4     Bill            1
Employee Type Table
ID   Type
1     Full-Time
2     Part-Time
3     Contractor
Assuming the user selects u2018Full-Timeu2019 and u2018Contractoru2019 from the parameter list, the SQL command query I want to generate is as follows:
SELECT *
FROM emp, emp_type
WHERE emp.ID = emp_type.ID and emp.TypeID in (u20181u2019, u20183u2019)
I tried building the following SQL command query so it would dynamically replace {?EmpType} with the IDu2019s of the types the user selected but it doesnu2019t work. Any ideas how to fix this?
SELECT *
FROM emp, emp_type
WHERE emp.ID = emp_type.ID and emp.TypeID in ({?EmpType})

Answer 1

Post Author: tdoman
CA Forum: Data Connectivity and SQL
btw...I just realized I had a typo in my "where" clause of the previous example. It should have been like so:WHERE emp.TypeID = emp_type.ID and emp.TypeID in (u20181u2019, u20183u2019)  satish_nair31:
Instead of passing the filter condition as parameter it would be fine if you pass it by ReportViewer.SelectionFormula Property.
The selection formula property of report viewer control will dynamically append the where condition with the SQL value. You will pass the filter condition as per the syntax of language supported by crystal reports.I believe using the ReportViewer.SelectionFormula property you are referring to is only available if I'm loading the report through a VB application. If this is true, then this option will not work for me because I'm loading the report in a browser from the Crystal Report web server and currently don't have a VB application that can load the report. If I did, then I could dynamically build the SQL string using VB then pass it to the Crystal Report on the fly.But I'm trying to figure out if it's possible to do it without loading the report using VB. Please correct me if I'm wrong on these assumptions.