我正在尝试在我的应用程序中编写用于用户授权的中间件。我用这个函数来检查某个路由是否需要登录。代码如下：
const { expressJwt } = require('express-jwt');
exports.requireSignin = expressJwt({
secret: process.env.JWT_SECRET,
algorithms: ["HS256"],
userProperty: "auth",});
但是，我收到以下错误：
TypeError: expressJwt is not a function at Object.<anonymous> (path to the file)\
可能是什么问题呢？其他答案似乎都没有帮助。
我正在尝试使用此引用语句 8 向表中添加多行：
INSERT INTO people (person_id, given_name, family_name, title)
WITH names AS (
SELECT 4, 'Ruth', 'Fox', 'Mrs' FROM dual UNION ALL
SELECT 5, 'Isabelle', 'Squirrel', 'Miss' FROM dual UNION ALL
SELECT 6, 'Justin', 'Frog', 'Master' FROM dual UNION ALL
SELECT 7, 'Lisa', 'Owl', 'Dr' FROM dual
)
SELECT * FROM names
问题是它使用了一个名为的表names，直到那个例子才被提及。我将其视为占位符并继续进行我自己的查询，如下所示：
INSERT INTO guest (first_name, last_name, address, phone, email, document_id, nationality, status, reservation_id, document_type_id)
WITH names AS (
SELECT 'John', 'Doe', 'Grove Street 8', 111222333, …我正在尝试使用游标编写一个简单的查询，但是我不断收到这个臭名昭著的“无效游标”错误。这是我的代码。
DECLARE
v_deptno NUMBER := 10;
c_last_name employees.last_name%TYPE;
c_salary employees.salary%TYPE;
c_manager_id employees.salary%TYPE;
CURSOR c_emp_cursor IS
SELECT last_name, salary, manager_id FROM employees
WHERE department_id = v_deptno;
BEGIN
--OPEN c_emp_cursor;
-- commented out because for loop opens the cursor automatically
FOR employee IN c_emp_cursor
LOOP
FETCH c_emp_cursor INTO c_last_name, c_salary, c_manager_id;
EXIT WHEN c_emp_cursor%NOTFOUND;
IF c_salary < 5000 THEN
IF c_manager_id = 101 OR c_manager_id = 124 THEN
dbms_output.put_line(c_last_name || 'due for a raise.');
ELSE
dbms_output.put_line(c_last_name || ' not due for a …正如标题所说，是否可以防止表中的数据被更新呢？我尝试使用以下触发器
CREATE OR REPLACE TRIGGER block_payment_update
BEFORE UPDATE ON payment
DECLARE
e_no_update_allowed EXCEPTION;
BEGIN
RAISE e_no_update_allowed;
EXCEPTION WHEN e_no_update_allowed THEN
dbms_output.put_line('Updating PAYMENT table is not allowed');
END;
我知道可以使用LOCK TABLE statementwith SHARE ROW EXCLUSIVE，但是它是否也有可能阻止向表中插入数据？