如何在Oracle db中对多行文本进行排序?

时间:2016-02-26 08:49:51

标签: oracle sorting multiline

如果字段中的文本位于多行中,我需要创建一个脚本,该脚本将对表B中所有记录的A列中的所有值进行排序(和更新)。

任何想法怎么做?我是甲骨文世界的佼佼者,所以感谢任何帮助。

Table B
id   column A
1    aaa
2    bb \n aa\n dd \n cc
3    bb \n aa

*(\ n是新行)

我需要它

  Table B
    id   column A
    1    aaa
    2    aa \n bb\n cc \n dd
    3    aa \n bb

2 个答案:

答案 0 :(得分:1)

您可以尝试使用'\ n'来分隔文本的单个值并对其进行排序。然后按照你提到的升序合并它。

with mydata(id,text)
as
(
  select 1, replace('aaa','\n',chr(10)) from dual
  union all
  select 2, replace('bb \n aa\n dd \n cc','\n',chr(10)) from dual
  union all
  select 3, replace('bb \n aa','\n',chr(10)) from dual
)
SELECT ID,REPLACE(LISTAGG(text_splitted,chr(10)) WITHIN GROUP (ORDER BY trim(text_splitted)),CHR(10),'\n')
FROM
(
SELECT  t1.id,
       REGEXP_SUBSTR(t1.text, '([^'||chr(10)||'])+', 1, t2.COLUMN_VALUE) text_splitted
FROM mydata t1 CROSS JOIN
            TABLE
            (
                CAST
                (
                    MULTISET
                    (
                        SELECT LEVEL
                        FROM DUAL 
                        CONNECT BY LEVEL <= REGEXP_COUNT(t1.text, '([^'||chr(10)||'])+')
                    )
                    AS SYS.odciNumberList
                )
            ) t2
)
GROUP BY ID;

'\n' - 新行字符将在CHR(10)ASCII值)中保存在数据库中。我使用相同的转换。后来用\ n用于显示目的。

答案 1 :(得分:1)

Oracle安装程序

CREATE TABLE Table_B ( id, column_A ) AS
SELECT 1, 'aaa' FROM DUAL UNION ALL
SELECT 2, 'bb ' || CHR(10) || ' aa' || CHR(10) || ' dd ' || CHR(10) || ' cc' FROM DUAL UNION ALL
SELECT 3, 'bb ' || CHR(10) || ' aa' FROM DUAL;

还使用我的SPLIT_STRING function

CREATE OR REPLACE FUNCTION split_String(
  i_str    IN  VARCHAR2,
  i_delim  IN  VARCHAR2 DEFAULT ','
) RETURN SYS.ODCIVARCHAR2LIST DETERMINISTIC
AS
  p_result       SYS.ODCIVARCHAR2LIST := SYS.ODCIVARCHAR2LIST();
  p_start        NUMBER(5) := 1;
  p_end          NUMBER(5);
  c_len CONSTANT NUMBER(5) := LENGTH( i_str );
  c_ld  CONSTANT NUMBER(5) := LENGTH( i_delim );
BEGIN
  IF c_len > 0 THEN
    p_end := INSTR( i_str, i_delim, p_start );
    WHILE p_end > 0 LOOP
      p_result.EXTEND;
      p_result( p_result.COUNT ) := SUBSTR( i_str, p_start, p_end - p_start );
      p_start := p_end + c_ld;
      p_end := INSTR( i_str, i_delim, p_start );
    END LOOP;
    IF p_start <= c_len + 1 THEN
      p_result.EXTEND;
      p_result( p_result.COUNT ) := SUBSTR( i_str, p_start, c_len - p_start + 1 );
    END IF;
  END IF;
  RETURN p_result;
END;
/

<强>查询

SELECT id,
       LISTAGG( COLUMN_VALUE, CHR(10) )
         WITHIN GROUP ( ORDER BY TRIM(COLUMN_VALUE) )
         AS sorted_column_a
FROM   Table_B B,
       TABLE( split_String( b.column_a, CHR(10) ) ) s
GROUP BY ID

<强>输出

        ID SORTED_COLUMN_A       
---------- ----------------
         1 aaa              
         2  aa              
           bb               
            cc              
            dd              

         3  aa              
           bb               

<强>更新

UPDATE TABLE_B b
SET column_a = ( SELECT LISTAGG( COLUMN_VALUE, CHR(10) )
                          WITHIN GROUP ( ORDER BY TRIM(COLUMN_VALUE) )
                 FROM   TABLE( split_String( b.column_a, CHR(10) ) ) );