Informix
update using database stored procedures
Database stored procedures that only perform updates and do not
return a result set are handled in much the same way as procedures that
return a result set. The only difference is that after the EXECUTE
procedure_name statement executes, no result set is pending and no CLOSE
statement is required.
Using the SQLCode property
If you know that a particular procedure can never return a result
set, only the EXECUTE statement is required. If there is a procedure that
may or may not return a result set, you can test the SQLCode property of
the referenced transaction object for +100 (the code for not found) after
the EXECUTE.
This table shows all possible values for SQLCode after an
EXECUTE:
|
Return code |
Means |
|---|---|
|
0 |
The EXECUTE PROCEDURE was successful and a result set This code is returned even if the result |
|
+100 |
Fetched row not found |
|
-1 |
The EXECUTE was not successful and no result set was |
Example 1
This example illustrates how to execute a database stored procedure
that does not return a result set:
|
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// good_employee is an Informix stored procedure. // Declare the procedure. DECLARE good_emp_p 1roc PROCEDURE FOR good_employee; EXECUTE good_emp_proc; // Test return code. Allow for +100 since you do // not expect a result set. if SQLCA.sqlcode = -1 then // Issue error message since it failed. MessageBox("Stored Procedure Error!", & SQLCA.sqlerrtext) end if |
Example 2
This example illustrates how to pass parameters to a database stored
procedure that returns a result set. Emp_id_var has been set elsewhere to
691:
|
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// Get_employee is an Informix stored procedure. // Declare the procedure. DECLARE get_emp_proc PROCEDURE FOR get_employee @emp_id_parm = :emp_id_var; // Declare a destination variable for emp_name string emp_name_var // Execute the stored procedure using the // current value for emp_id_var. EXECUTE get_emp_proc; // Test return code to see if it worked. if SQLCA.sqlcode = 0 then // We got a row, so fetch it and display it. FETCH get_emp_proc INTO :emp_name_var; // Display the employee name. MessageBox("Got my employee!",emp_name_var) // You are all done, close the procedure. CLOSE Get_emp_proc; end if |