Oracle中使用Table()函数解决For循环中不写成 in (l_idlist)形式的问题

 

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Oracle中使用Table()函数解决For循环中不写成 in (l_idlist)形式的问题

在实际PL/SQL编程中，我们要对动态取出来的一组数据，进行For循环处理，其基本程序逻辑为：

 

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create or replace procedure getidlist
is
  l_idlist varchar2(200);
begin
  l_idlist:='1,2,3,4';
  for brrs in (select * from bldroom where bldroomid in (l_idlist))
  loop
      brrs.structure:='钢混';
  end loop;
end;
/
show err;

1、编译该程序，可以正常通过；

 

2、执行该程序exec getidlist，系统提示：ORA-01722: invalid number，ORA-06512: at "TT.GETIDLIST", line 6

 

解决方案：

 

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CREATE OR REPLACE TYPE type_split IS TABLE OF VARCHAR2 (4000);
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create or replace function split(p_list varchar2,p_sep varchar2 := ',') return type_split pipelined
IS
 l_idx pls_integer;
 v_list varchar2(50) := p_list;
 begin
      loop
           l_idx := instr(v_list,p_sep);
           if l_idx > 0 then
               pipe row(substr(v_list,1,l_idx-1));
               v_list := substr(v_list,l_idx+length(p_sep));
           else
                pipe row(v_list);
                exit;
           end if;
      end loop;
      return;
 end split;

此时修改getidlist代码如下：

 

 

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create or replace procedure getidlist
is
  l_idlist varchar2(200);
begin
  l_idlist:='1,2,3,4';
  for brrs in (select * from bldroom where bldroomid in (select column_value from table(split(l_idlist,','))))
  loop
      brrs.structure:='钢混';
  end loop;
end;
/
show err;

 

执行：exec getidlist;

提示错误：ORA-22905: cannot access rows from a non-nested table item

 

再次修改getidlist代码如下：

 

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create or replace procedure getidlist
is
  brRow    bldroom%rowtype;
  l_idlist varchar2(200);
begin
  l_idlist:='1,2,3,4';
  for idrs in (select column_value from table(split(l_idlist,',')))
  loop
      select * into brRow from bldroom where bldroomid=idrs.column_value;
      brRow.structure:='ssss';
  end loop;
end;
/
show err;

 

 

OK,搞定。

 

附：PL/SQL表---table()函数用法

摘录

 

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/*
利用table()函数，我们可以将PL/SQL返回的结果集代替table。
oracle内存表在查询和报表的时候用的比较多，它的速度相对物理表要快几十倍。
*/
/*
simple example：
1、table()结合数组：
*/
 
create or replace type t_test as object(
id integer,
rq date,
mc varchar2(60)
);
 
create or replace type t_test_table as table of t_test;
 
create or replace function f_test_array(n in number default null) return t_test_table
as
v_test t_test_table := t_test_table();
begin
for i in 1 .. nvl(n,100) loop
v_test.extend();
v_test(v_test.count) := t_test(i,sysdate,'mc'||i);
end loop;
return v_test;
end f_test_array;
/
 
select * from table(f_test_array(10));
 
select * from the(select f_test_array(10) from dual);
 
/*
2、table()结合PIPELINED函数：
*/
 
create or replace function f_test_pipe(n in number default null) return t_test_table PIPELINED
as
v_test t_test_table := t_test_table();
begin
for i in 1 .. nvl(n,100) loop
pipe row(t_test(i,sysdate,'mc'||i));
end loop;
return;
end f_test_pipe;
/
 
select * from table(f_test_pipe(20));
 
select * from the(select f_test_pipe(20) from dual);
 
/*
3、table()结合系统包：
*/
 
create table test (id varchar2(20));
insert into test values('1');
commit;
explain plan for select * from test;
select * from table(dbms_xplan.display);

 

关于错误：ORA-22905: cannot access rows from a non-nested table item 的解决方案，不知各位大侠有没有更好的解决方案？请指教。

posted @ 2019-12-02 16:24  戈博折刀  阅读(748)  评论(0)    收藏  举报