使用IF语句的PL/SQL Oracle查询

Question

我想实现一个只返回登录用户并仅显示记录的查询,我按照以下方式进行了操作:

SELECT * FROM EMPLOYEE
WHERE UPPER(username) = v('APP_USER')

但是,我有另一个名为User_Type的列,用户可以是类型1,2或3.如果我的用户类型为1,我希望查询也返回所有表记录,因为用户类型1是管理员.

我想这样做:

BEGIN
SELECT * FROM Employee 
WHERE upper(username) = v('APP_USER')
IF User_Type = 1
THEN SELECT * FROM Employee
END IF;
END;
/

但它在APEX Oracle PLSQL中不起作用.

有什么建议？

Answer 1

根据我的理解,你需要尝试这个:

DECLARE
  emp employee%ROWTYPE; -- Create a record type
  tbl_emp IS TABLE OF emp;
  -- ^^^ Create a table of that record type
  v_user_type employee.user_type%TYPE;
  -- ^^^ Variable to store user type
BEGIN
  SELECT user_type
    INTO v_user_type
    FROM Employee 
   WHERE upper(username) = v('APP_USER');

  IF v_user_type = 1 THEN
    SELECT *
           BULK COLLECT INTO tbl_emp
      FROM employee;
    -- ^^ Returns the entire table
  ELSE
    SELECT *
           BULK COLLECT INTO tbl_emp
      FROM employee;
     WHERE upper(username) = v('APP_USER');
    -- ^^ Returns the row related to the user.
  END IF;
END;
/

输出存储在嵌套表变量中tbl_emp.

编辑:

它也可以使用纯SQL实现,如下所示:

SELECT *
  FROM employee e
 WHERE EXISTS (SELECT 1
                 FROM employees e_in
                WHERE e_in.user_type = 1
                  AND UPPER(e_in.username) = v('APP_USER'))
    OR UPPER(e.username) = v('APP_USER')

选择最适合您的方式.