--本人是初学者，不知道还有没有更好的方法create table PASSWD_CHANGED

(

USER_NAME VARCHAR2(20),

OLD_PASSWD VARCHAR2(100),

NEW_PASSWD VARCHAR2(100)

)

CREATE OR REPLACE FUNCTION my_password_verify(username

VARCHAR2,

password

VARCHAR2,

old_password

VARCHAR2)

RETURN BOOLEAN IS

v_days NUMBER(20);

BEGIN

EXECUTE

IMMEDIATE 'SELECT TRUNC(expiry_date)-TRUNC(SYSDATE) FROM DBA_USERS u WHERE

u.username=:username'

INTO v_days

USING username;

IF v_days

< 1 THEN

raise_application_error(-20001, 'the password has

expired!'||chr(10)||'Contact :13611111111');

END IF;

/*

IF

LENGTH(password) < 6 THEN

raise_application_error(-20001,'Password must

be at least 6 characters long');

END IF;

*/

INSERT INTO

passwd_changed VALUES (username, old_password, password);

RETURN(TRUE);

END;

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