[pl sql] where current of

最新推荐文章于 2024-09-03 16:28:30 发布

转载最新推荐文章于 2024-09-03 16:28:30 发布 · 157 阅读

本文探讨了在Oracle中使用SELECT FOR UPDATE时遇到的问题，包括使用显式静态游标进行更新时的ORA-06550错误及循环内提交导致的ORA-01002错误，并提供了具体的示例代码。

使用select for update 的时候的几个问题

1，使用显示静态游标

eg：

create table tb_test_1 (id number,
name varchar2(20));

insert into tb_test_1 (id, name) values (1, 'name');

declare
my_test test.tb_test_1%rowtype;
cursor cs is
select * from tb_test_1 for update;
begin

for css in cs loop
    my_test.id   := css.id;
    my_test.name := css.name || 's';
    update tb_test_1 a
       set a.id = my_test.id, a.name = my_test.name
     where current of cs;
end loop;
commit;

end;

若：

declare
my_test test.tb_test_1%rowtype;
type cs is ref cursor;
css cs;
begin

open css for
select * from tb_test_1 for update;

loop

fetch css into my_test;
exit when css%notfound;
    update tb_test_1 a
       set a.id = my_test.id, a.name = my_test.name||'s'
     where current of css;
end loop;
commit;

end;

则ora-06550

2,注意loop内不能commit

eg：

insert into tb_test_1 (id, name) values (2, 'name2');

declare
my_test test.tb_test_1%rowtype;
cursor cs is
select * from tb_test_1 for update;
begin

for css in cs loop
    my_test.id   := css.id;
    my_test.name := css.name || 's';
    update tb_test_1 a
       set a.id = my_test.id, a.name = my_test.name
     where current of cs;
     commit;
end loop;
commit;

end;

则：ora-01002

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