Oracle 用户密码过期后不允许修改密码的示例代码

--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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