Yes, it is possible to perform a PostgreSQL stored procedure call and fetch query simultaneously using the INOUT
parameter.
Here's an example:
CREATE OR REPLACE FUNCTION get_employee_details(INOUT emp_id INTEGER, OUT emp_name VARCHAR, OUT emp_salary NUMERIC)
LANGUAGE plpgsql
AS $$
BEGIN
SELECT name, salary INTO emp_name, emp_salary FROM employees WHERE id = emp_id;
SELECT count(*) INTO emp_id FROM employees WHERE salary > emp_salary;
END;
$$;
DECLARE
emp_id INTEGER := 1;
emp_name VARCHAR;
emp_salary NUMERIC;
BEGIN
SELECT emp_id, emp_name, emp_salary
FROM get_employee_details(emp_id, emp_name, emp_salary);
-- Do something with the results
END;
In this example, we have defined a stored procedure get_employee_details
that takes an INOUT
parameter emp_id
and two OUT
parameters emp_name
and emp_salary
.
Inside the stored procedure, we first fetch the name and salary of the employee with the given emp_id
and assign them to the emp_name
and emp_salary
parameters.
Then, we run another query to count the number of employees whose salary is greater than the fetched employee's salary and assign the count to the same emp_id
parameter.
Finally, in the main program, we call the stored procedure by passing the emp_id
, emp_name
, and emp_salary
variables as arguments. The stored procedure modifies the emp_id
parameter, which is then used to fetch the results and do something with them.
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Asked: 2023-06-21 05:22:42 +0000
Seen: 12 times
Last updated: Jun 21 '23
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