PL/SQL 中是否有拆分字符串的函数?

问题描述

我需要编写一个过程来规范化具有多个由一个字符连接的标记的记录.我需要获取分割字符串的这些标记，并将每个标记作为新记录插入表中.Oracle 是否有类似拆分"功能的功能?

I need to write a procedure to normalize a record that have multiple tokens concatenated by one char. I need to obtain these tokens splitting the string and insert each one as a new record in a table. Does Oracle have something like a "split" function?

推荐答案

你必须自己动手.例如，

You have to roll your own. E.g.,

/* from :http://www.builderau.com.au/architect/database/soa/Create-functions-to-join-and-split-strings-in-Oracle/0,339024547,339129882,00.htm

select split('foo,bar,zoo') from dual;
select * from table(split('foo,bar,zoo'));

pipelined function is SQL only (no PL/SQL !)
*/

create or replace type split_tbl as table of varchar2(32767);
/
show errors

create or replace function split
(
    p_list varchar2,
    p_del varchar2 := ','
) return split_tbl pipelined
is
    l_idx    pls_integer;
    l_list    varchar2(32767) := p_list;
    l_value    varchar2(32767);
begin
    loop
        l_idx := instr(l_list,p_del);
        if l_idx > 0 then
            pipe row(substr(l_list,1,l_idx-1));
            l_list := substr(l_list,l_idx+length(p_del));

        else
            pipe row(l_list);
            exit;
        end if;
    end loop;
    return;
end split;
/
show errors;

/* An own implementation. */

create or replace function split2(
  list in varchar2,
  delimiter in varchar2 default ','
) return split_tbl as
  splitted split_tbl := split_tbl();
  i pls_integer := 0;
  list_ varchar2(32767) := list;
begin
  loop
    i := instr(list_, delimiter);
    if i > 0 then
      splitted.extend(1);
      splitted(splitted.last) := substr(list_, 1, i - 1);
      list_ := substr(list_, i + length(delimiter));
    else
      splitted.extend(1);
      splitted(splitted.last) := list_;
      return splitted;
    end if;
  end loop;
end;
/
show errors

declare
  got split_tbl;

  procedure print(tbl in split_tbl) as
  begin
    for i in tbl.first .. tbl.last loop
      dbms_output.put_line(i || ' = ' || tbl(i));
    end loop;
  end;

begin
  got := split2('foo,bar,zoo');
  print(got);
  print(split2('1 2 3 4 5', ' '));
end;
/

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