如何根据mysql中存储过程中的参数创建动态where条件？

Question

I have created a stored procedure in which I want to list employees according to the parameter. The procedure has some parameters, one of them I want to use for the type(eg:branch, department etc) and the other is the id corresponding to that.

I want to create where conditions to variable.

How can I do that?

DELIMITER $$

CREATE PROCEDURE Emp_details(IN div_type VARCHAR(100), IN id INT, OUT emp_name VARCHAR(100)) 
BEGIN 

        DECLARE cond VARCHAR(100);

        IF div_type = 'branch' THEN
            SET cond = 'branch_id='+id;
        ELSEIF div_type = 'department' THEN
            SET cond = 'department_id='+id;
        ELSEIF div_type = 'emp' THEN
            SET cond = 'employee_master_id='+id;
        ELSE
            SET cond = '';
        END IF;                                                                                    


        SELECT
         emp_fullname INTO emp_name
            FROM armr_employee_master
        WHERE +cond ;



END$$

Answer 1

Just turn the IF into a WHERE :

SELECT emp_fullname
INTO emp_name
FROM armr_employee_master
WHERE id = CASE div_type
    WHEN 'branch' THEN branch_id
    WHEN 'department' THEN department_id
    WHEN 'emp' THEN employee_master_id
END