Question

我试图弄清楚如何显示用户输入的insert语句。我希望它在“请更新插入语句”文本打印后显示。通过在线阅读大量内容，我发现您可以通过输入“/”符号显示上一个在oracle上输入的命令，还可以通过运行此查询来显示'SELECT * FROM gv $ sql WHERE SQL_ID = IDENT_CURRENT（'gv $ SQL '）'。我尝试使用dbms_output.put_line（/）并使用t0_char（'/'）;在查询中，如下所示。有什么提示吗？

set serveroutput on
CREATE or REPLACE trigger before_insert_t
before insert on reservations
for each row

DECLARE
rooms_remaining number(5,2);

BEGIN

select roooms_rem into rooms_remaining from reservations where roomno=:new.roomno;

if rooms_remaining = 0 then

    dbms_output.put_line('Insertion now allowed because room ' || :new.roomno || ' is booked!' );
dbms_output.put_line('Please update the insert statement');
--  to_char('/');
    dbms_output.put_line('insert into reservations values ' || :new.roomno  );
--  EXECUTE IMMEDIATE sql_stmt;
end if;
END;
/
show errors
insert into reservations values (99,9);

Answer 1

CREATE or REPLACE trigger before_insert_t
before insert on TEST_TAB1
for each row    
DECLARE
  sql_insert varchar2(1000);    
BEGIN    
  select sql_text into sql_insert 
    from (select sql_text 
            from v$sql 
            where upper(sql_text) like 'INSERT INTO TEST_TAB1%'
            order by first_load_time desc)
   where rownum=1;  
  dbms_output.put_line('Inserting into table SQL is '||sql_insert);    
END;
/

SQL> set serveroutput on
SQL> insert into TEST_TAB1 values ('Hello');
1 rows inserted.
Inserting into table SQL is insert into TEST_TAB1 values (:"SYS_B_0")

按FIRST_LOAD_TIME排序并按降序排序，如果有多个INSERT，则选择第一行作为最新的INSERT语句。

显示输入的命令以运行触发器

1 个答案: