Oracle-分割字符串逗号分隔(字符串包含空格和连续逗号)

Question

我找不到有关如何在ORACLE中拆分逗号分隔字符串的解决方案.搜索了很多,没有什么适用于我的情况

码

DECLARE
  TYPE T_ARRAY_OF_VARCHAR IS TABLE OF VARCHAR2(2000) INDEX BY BINARY_INTEGER;
  MY_ARRAY T_ARRAY_OF_VARCHAR;
  MY_STRING VARCHAR2(2000) := '12 3,456,,abc,def';
BEGIN
 FOR CURRENT_ROW IN (
    with test as    
      (select MY_STRING from dual)
      select regexp_substr(MY_STRING, '[^,]+', 1, rownum) SPLIT
      from test
      connect by level <= length (regexp_replace(MY_STRING, '[^,]+'))  + 1)

  LOOP
   DBMS_OUTPUT.PUT_LINE('>' || CURRENT_ROW.SPLIT || '<');
   --DBMS_OUTPUT.PUT_LINE(CURRENT_ROW.SPLIT);
    MY_ARRAY(MY_ARRAY.COUNT) := CURRENT_ROW.SPLIT;
  END LOOP;

  DBMS_OUTPUT.PUT_LINE('Array Size:' || MY_ARRAY.COUNT);
END;

/

输出是:

>12 3<
>456<
>abc<
>def<
><
Array Size:5

空值无序!!!!

Answer 1

试试这个来解析列表部分.它处理NULLS:

SQL> select regexp_substr('12 3,456,,abc,def', '(.*?)(,|$)', 1, level, null, 1) SPLIT, level
    from dual
    connect by level <= regexp_count('12 3,456,,abc,def',',') + 1
    ORDER BY level;

SPLIT                  LEVEL
----------------- ----------
12 3                       1
456                        2
                           3
abc                        4
def                        5

SQL>

不幸的是,当你搜索正则表达式来解析列表时,你总会发现这个表格不处理空值而应该避免:'[^,]+'.有关详细信息,请参阅此处:将逗号分隔值拆分为Oracle中的列.