Oracle 字串分割的處理

1.首先要先建立數組

create or replace type t_ret_table is table of varchar2(20);

2.利用自訂函數實現一，利用函數返回數組．
create or replace function f_split_string(var_str in string,var_split In String) return t_ret_table
is
var_out t_ret_table;
var_tmp varchar2(4000);
var_element varchar2(4000);
begin
var_tmp := var_str;
var_out := t_ret_table();
--如果存在匹配的分割符
while instr(var_tmp,var_split)>0 loop
var_element := substr(var_tmp,1,instr(var_tmp,var_split)-1);
var_tmp := substr(var_tmp,instr(var_tmp,var_split)+length(var_split),length(var_tmp));
var_out.extend(1);
var_out(var_out.count) := var_element;
end loop;
var_out.extend(1);
var_out(var_out.count) := var_tmp;
return var_out;
end f_split_string;

3.利用 pipelined Function 函數實現.
create or replace function f_split(var_str in string,var_split In String) return t_ret_table PIPELINED
as
var_tmp varchar2(4000);
var_element varchar2(4000);
n_length Number := length(var_split);
begin
var_tmp := var_str;
while instr(var_tmp,var_split)>0 loop
var_element := substr(var_tmp,1,instr(var_tmp,var_split)-1);
var_tmp := substr(var_tmp,instr(var_tmp,var_split)+n_length,length(var_tmp));
pipe row(var_element);
end loop;
pipe row(var_tmp);
return;
end f_split;

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