DB2 Host Variables

Scenario1 - INSERT Statement Using Host Variables.

...
EXEC SQL
    INSERT INTO Employees (Emp_ID, Emp_Name, Salary)
    VALUES (:WS-EMP-ID, :WS-EMP-NAME, :WS-SALARY)
END-EXEC.
...

The host variables (WS-EMP-ID, WS-EMP-NAME, and WS-SALARY) are used to insert the input data to the Employees table.

Scenario2 - SELECT Statement Using Host Variables.

...
EXEC SQL
    SELECT Emp_Name, Salary
    INTO :WS-EMP-NAME, :WS-SALARY
    FROM Employees
    WHERE Emp_ID = :WS-EMP-ID
END-EXEC.
...

WS-EMP-ID provides the input value to identify the employee. The result (employee name and salary) is retrieved into WS-EMP-NAME and WS-SALARY.