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我从3个月开始学习PLSQL。现在我正在练习显式游标。我已经写了一个简单的游标,并且对于员工的查询5行使用了属性%ROWCOUNT,但我在屏幕上只收到了4名员工。为什么?为什么我没有得到我获取的确切行数?
SET SERVEROUTPUT ON
DECLARE
CURSOR cur_emp IS
SELECT e.employee_id, e.last_name, d.department_id, d.department_name
FROM employees e
JOIN departments d
ON (e.department_id = d.department_id);
v_emp_id employees.employee_id%TYPE;
v_emp_name employees.last_name%TYPE;
v_dept_id departments.department_id%TYPE;
v_dept_name departments.department_name%TYPE;
BEGIN
OPEN cur_emp;
LOOP
FETCH cur_emp
INTO v_emp_id, v_emp_name, v_dept_id, v_dept_name;
EXIT WHEN cur_emp%ROWCOUNT = 5;
DBMS_OUTPUT.PUT_LINE('EMPLOYEE ID: ' || v_emp_id || ' EMPLOYEE: ' ||
v_emp_name || ' DEPARTMENT ID: ' || v_dept_id || ' DEPARTMENT NAME: ' ||
v_dept_name);
END LOOP;
CLOSE cur_emp;
END;
/
谢谢您的帮助!我现在明白了。 – Rattlesnake