Oracle隐式游标获取记录数
Oracle使用两种光标:显式光标和隐式光标。不管语句返回多少条纪录,PL/SQL为使用的每一条UPDATE、DELETE和INSERT等SQL命令隐式的
怎样统计PLSQL语言中删除语句执行之后一共删除了多少条纪录。
Oracle使用两种光标:显式光标和隐式光标。不管语句返回多少条纪录,PL/SQL为使用的每一条UPDATE、DELETE和INSERT等SQL命令隐式的声明一个光标。(要管理SQL语句的处理,必须隐式的给它定义一个光标。)
在PL/SQL中,,当执行DML语句的时候,会自动打开一个隐式游标(游标就类似JDBC中的ResultSet),而相关要被操作的数据都是会先被放入隐式游标。隐式游标由ORACLE帮我们自动管理,如果想要手动进行一些操作的话,我们可以使用隐式游标的相关属性。如:
SQL%FOUND 成功获取记录返回true,否则返回false
SQL%NOTFOUND 成功获取记录返回true,否则返回false
SQL%ROWCOUNT 返回从游标中获取的记录条数
SQL%ISOPEN 总是返回false
利用隐式游标属性SQL%ROWCOUNT可以达到计算删除了多少条纪录。
可以获取的DML sql包括:INSERT /UPDATE/DELETE /MERGER
具体使用看下面的例子把
create or replace procedure test_02 is
CNT INT;
begin
DELETE FROM TEST_01 ;
cnt:=sql%rowcount;
commit;
end;
create or replace procedure test_03 is
CNT INT;
n_1 int;
n_2 int;
n_3 int;
begin
merge into test_04
using (select * from test_09 )
merger_subquery
on(test_04.object_id = merger_subquery.object_id)
when not matched then
insert (object_id,OBJECT_NAME)
values (merger_subquery.object_id,merger_subquery.object_name)
when matched then
update set object_name = merger_subquery.object_name;
cnt:=sql%rowcount;
n_1:=cnt;
commit;
end;

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