在Oracle中,可以通过以下四种方式传递游标给PL/SQL函数:
CREATE OR REPLACE FUNCTION get_employee_salary(p_cursor IN SYS_REFCURSOR)
RETURN NUMBER IS
v_salary NUMBER;
BEGIN
FETCH p_cursor INTO v_salary;
RETURN v_salary;
END;
CREATE OR REPLACE FUNCTION get_employee_salary(p_cursor OUT SYS_REFCURSOR)
RETURN NUMBER IS
v_salary NUMBER;
BEGIN
OPEN p_cursor FOR SELECT salary FROM employees;
FETCH p_cursor INTO v_salary;
RETURN v_salary;
END;
CREATE OR REPLACE FUNCTION get_employee_salary
RETURN SYS_REFCURSOR IS
v_cursor SYS_REFCURSOR;
BEGIN
OPEN v_cursor FOR SELECT salary FROM employees;
RETURN v_cursor;
END;
CREATE OR REPLACE FUNCTION get_employee_salary(p_cursor IN OUT SYS_REFCURSOR)
RETURN NUMBER IS
v_salary NUMBER;
BEGIN
FETCH p_cursor INTO v_salary;
RETURN v_salary;
END;
这些是四种常用的方式,可以根据具体情况选择适合的方式传递游标给PL/SQL函数。