在PL SQL中删除Statement

Question

可以在PL SQL中执行Drop.

这个SQL有什么问题

我试图放弃所有用户.问题出在drop user username cascase语句中

connect sys/abcsds@1.1.1.1 as sysdba
exec dbms_output.enable(1000000);
set serveroutput on
DECLARE
BEGIN
for rec in (select username from dba_users where username LIKE 'S%' AND username NOT LIKE 'SY%') loop
dbms_output.put_line(to_char(rec.username));
dbms_sql.execute('drop user rec.username cascade');
end loop;
END;
.
run;
exit;

Answer 1

您可以在循环中使用DDL,但是您必须构建字符串,因为您无法绑定对象名称.

例如:

DECLARE
   l_ddl VARCHAR2(1000);
BEGIN
   FOR rec IN (SELECT username
                 FROM dba_users
                WHERE username LIKE 'S%'
                  AND username NOT LIKE 'SY%') LOOP
      l_ddl := 'drop user '|| rec.username ||' cascade';
      dbms_output.put_line(l_ddl);
      EXECUTE IMMEDIATE (l_ddl);
   END LOOP;
END;

但要小心,DDL在Oracle中不是事务性的(它在之前和之后执行提交),因此您将无法回滚任何更改.