Defining Cursor Variables - REF CURSOR - RETURN clause.
This Oracle tutorial explains how to use the CURSOR FOR LOOP in Oracle with syntax and examples. Description You would use a CURSOR FOR LOOP when you want to fetch and process every record in a cursor.
A system variable is an Oracle Forms variable that keeps track of an internal Oracle Forms state. You can reference the value of a system variable to control the way an application behaves. Oracle Forms maintains the values of system variables on a per form basis. That is, the values of all system variables correspond only to the current form.
In order to create a cursor variable you have to first write the name of your variable followed by the name of your Ref Cursor. Thereafter this variable will be used to refer to the Ref Cursor over which it is created.
Cursors With Parameters We can pass parameters into a cursor and use them in the query. We can only pass values to the cursor; and cannot pass values out of the cursor through parameters. Only the datatype of the parameter is defined, not its length.
The trick to declaring a cursor within a cursor is that you need to continue to open and close the second cursor each time a new record is retrieved from the first cursor. That way, the second cursor will use the new variable values from the first cursor.
When using named bind variables you can check the currently assigned ones using the bindnames() method of the cursor: Passing by position is similar but you need to be careful about naming. Variable names are arbitrary so it's easy to mess up queries this way. In the example below, all three queries r1, r2, and r3 are equivalent.
To return a cursor from an Oracle stored procedure, the output parameter of the procedure must be declared as a cursor type. You must also declare that parameter as a cursor in the LWJDBC adapter. Below is a complete working example utilizing existing pools and a Sterling Integrator table.