如何定界大逗号分隔字符串 - Oracle 过程

问题描述 投票：0回答：3

我正在 Oracle 12C 中工作，并将逗号分隔的列表从我的 C# 程序传递到 Oracle 过程，想要分隔字符串并希望在动态 sql 中使用它。我在程序中使用 CLOB 从 C# 接收此数据并创建了以下函数

CREATE OR REPLACE TYPE ARRAY AS TABLE OF VARCHAR2 (4000);

CREATE OR REPLACE FUNCTION PARSE_CSV (p_clob CLOB, p_separator VARCHAR2)
    RETURN ARRAY
    PIPELINED
AS
    v_size           NUMBER;
    v_start_pos      NUMBER := 1;
    v_new_position   NUMBER := 0;
    v_line           VARCHAR2 (4000);
    x_clob           CLOB := p_clob || TO_CLOB (p_separator);
BEGIN
    v_size := DBMS_LOB.getlength (x_clob);

    WHILE v_start_pos <= v_size
    LOOP
        v_new_position :=
            NVL (INSTR (x_clob, p_separator, v_start_pos), 4000);
        v_line := SUBSTR (x_clob, v_start_pos, v_new_position - v_start_pos);
        v_start_pos := v_new_position + LENGTH (p_separator);

        PIPE ROW (v_line);
    END LOOP;

    RETURN;
END;
/

但是当我在动态 sql 中使用它时，我收到 ORA-01704：字符串文字太长。 下面是示例 CSV 数据

PAR000015,PAR000016,PAR000017,PAR000018,PAR000019,PAR000020,PAR000021,PAR000022,PAR000023,PAR000024,PAR000025,PAR000026,PAR000027,PAR000028,PAR000029,PAR000030,PAR000031,PAR000032,PAR000033,PAR000034,PAR000035,PAR000036,PAR000037,PAR000038,PAR000039,PAR000040,PAR000041,PAR000042,PAR000043,PAR000044,PAR000045,PAR000046,PAR000047,PAR000048,PAR000049,PAR000050,PAR000051,PAR000052,PAR000053,PAR000054,PAR000055,PAR000056,PAR000057,PAR000058,PAR000059,PAR000060,PAR000061,PAR000062,PAR000063,PAR000064,PAR000065,PAR000066,PAR000067,PAR000068,PAR000069,PAR000070,PAR000071,PAR000072,PAR000073,PAR000074,PAR000075,PAR000076,PAR000077,PAR000078,PAR000079,PAR000080,PAR000081,PAR000082,PAR000083,PAR000084,PAR000085,PAR000086,PAR000087,PAR000088,PAR000089,PAR000090,PAR000091,PAR000092,PAR000093,PAR000094,PAR000095,PAR000096,PAR000097,PAR000098,PAR000099,PAR000100,PAR000101,PAR000102,PAR000103,PAR000104,PAR000105,PAR000106,PAR000107,PAR000108,PAR000109,PAR000110,PAR000111,PAR000112,PAR000113,PAR000114,PAR000115,PAR000116,PAR000117,PAR000118,PAR000119,PAR000120,PAR000121,PAR000122,PAR000123,PAR000124,PAR000125,PAR000126,PAR000127,PAR000128,PAR000129,PAR000130,PAR000131,PAR000132,PAR000133,PAR000134,PAR000135,PAR000136,PAR000137,PAR000138,PAR000139,PAR000140,PAR000141,PAR000142,PAR000143,PAR000144,PAR000145,PAR000146,PAR000147,PAR000148,PAR000149,PAR000150,PAR000151,PAR000152,PAR000153,PAR000154,PAR000155,PAR000156,PAR000157,PAR000158,PAR000159,PAR000160,PAR000161,PAR000162,PAR000163,PAR000164,PAR000165,PAR000166,PAR000167,PAR000168,PAR000169,PAR000170,PAR000171,PAR000172,PAR000173,PAR000174,PAR000175,PAR000176,PAR000177,PAR000178,PAR000179,PAR000180,PAR000181,PAR000182,PAR000183,PAR000184,PAR000185,PAR000186,PAR000187,PAR000188,PAR000189,PAR000190,PAR000191,PAR000192,PAR000193,PAR000194,PAR000195,PAR000196,PAR000197,PAR000198,PAR000199,PAR000200,PAR000201,PAR000202,PAR000203,PAR000204,PAR000205,PAR000206,PAR000207,PAR000208,PAR000209,PAR000210,PAR000211,PAR000212,PAR000213,PAR000214,PAR000215,PAR000216,PAR000217,PAR000218,PAR000219,PAR000220,PAR000221,PAR000222,PAR000223,PAR000224,PAR000225,PAR000226,PAR000227,PAR000228,PAR000229,PAR000230,PAR000231,PAR000232,PAR000233,PAR000234,PAR000235,PAR000236,PAR000237,PAR000238,PAR000239,PAR000240,PAR000241,PAR000242,PAR000243,PAR000244,PAR000245,PAR000246,PAR000247,PAR000248,PAR000249,PAR000250,PAR000251,PAR000252,PAR000253,PAR000254,PAR000255,PAR000256,PAR000257,PAR000258,PAR000259,PAR000260,PAR000261,PAR000262,PAR000263,PAR000264,PAR000265,PAR000266,PAR000267,PAR000268,PAR000269,PAR000270,PAR000271,PAR000272,PAR000273,PAR000274,PAR000275,PAR000276,PAR000277,PAR000278,PAR000279,PAR000280,PAR000281,PAR000282,PAR000283,PAR000284,PAR000285,PAR000286,PAR000287,PAR000288,PAR000289,PAR000290,PAR000291,PAR000292,PAR000293,PAR000294,PAR000295,PAR000296,PAR000297,PAR000298,PAR000299,PAR000300,PAR000301,PAR000302,PAR000303,PAR000304,PAR000305,PAR000306,PAR000307,PAR000308,PAR000309,PAR000310,PAR000311,PAR000312,PAR000313,PAR000314,PAR000315,PAR000316,PAR000317,PAR000318,PAR000319,PAR000320,PAR000321,PAR000322,PAR000323,PAR000324,PAR000325,PAR000326,PAR000327,PAR000328,PAR000329,PAR000330,PAR000331,PAR000332,PAR000333,PAR000334,PAR000335,PAR000336,PAR000337,PAR000338,PAR000339,PAR000340,PAR000341,PAR000342,PAR000343,PAR000344,PAR000345,PAR000346,PAR000347,PAR000348,PAR000349,PAR000350,PAR000351,PAR000352,PAR000353,PAR000354,PAR000355,PAR000356,PAR000357,PAR000358,PAR000359,PAR000360,PAR000361,PAR000362,PAR000363,PAR000364,PAR000365,PAR000366,PAR000367,PAR000368,PAR000369,PAR000370,PAR000371,PAR000372,PAR000373,PAR000374,PAR000375,PAR000376,PAR000377,PAR000378,PAR000379,PAR000380,PAR000381,PAR000382,PAR000383,PAR000384,PAR000385,PAR000386,PAR000387,PAR000388,PAR000389,PAR000390,PAR000391,PAR000392,PAR000393,PAR000394,PAR000395,PAR000396,PAR000397,PAR000398,PAR000399,PAR000400,PAR000401,PAR000402,PAR000403,PAR000404,PAR000405,PAR000406,PAR000407,PAR000408,PAR000409,PAR000410,PAR000411,PAR000412,PAR000413,PAR000414,PAR000415,PAR000416,PAR000417,PAR000418,PAR000419,PAR000420,PAR000421,PAR000422,PAR000423,PAR000424,PAR000425,PAR000426,PAR000427,PAR000428,PAR000429,PAR000430,PAR000431,PAR000432,PAR000433,PAR000434,PAR000435,PAR000436,PAR000437,PAR000438,PAR000439,PAR000440,PAR000441,PAR000442,PAR000443,PAR000444,PAR000445,PAR000446,PAR000447,PAR000448,PAR000449,PAR000450,PAR000451,PAR000452,PAR000453,PAR000454,PAR000455,PAR000456,PAR000457,PAR000458,PAR000459,PAR000460,PAR000461,PAR000462,PAR000463,PAR000464,PAR000465,PAR000466,PAR000467,PAR000468,PAR000469,PAR000470,PAR000471,PAR000472,PAR000473,PAR000474,PAR000475,PAR000476,PAR000477,PAR000478,PAR000479,PAR000480,PAR000481,PAR000482,PAR000483,PAR000484,PAR000485,PAR000486,PAR000487,PAR000488,PAR000489,PAR000490,PAR000491,PAR000492,PAR000493,PAR000494,PAR000495,PAR000496,PAR000497,PAR000498,PAR000499,PAR000500,PAR000501,PAR000502,PAR000503,PAR000504,PAR000505,PAR000506,PAR000507,PAR000508,PAR000509,PAR000510,PAR000511,PAR000512,PAR000513,PAR000514,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请帮助解决此问题或任何显示解决此问题的 sql 的示例帖子。

oracle plsql oracle12c
3个回答
0
投票

您不需要将分隔符连接到字符串的末尾。相反，您可以直接使用传递的 

CLOB
并将最终列表元素作为特殊情况处理（它允许您区分 
NULL
CLOB 和 
EMPTY_CLOB()
）。

将我的代码从这个答案调整为

PIPELINED
函数：

CREATE OR REPLACE FUNCTION parse_csv(
  i_str    IN  CLOB,
  i_delim  IN  VARCHAR2 DEFAULT ','
) RETURN array PIPELINED DETERMINISTIC
AS
  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 IS NULL THEN
    RETURN;
  END IF;

  p_end := INSTR( i_str, i_delim, p_start );
  WHILE p_end > 0 LOOP
    PIPE ROW (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
      PIPE ROW (SUBSTR( i_str, p_start, c_len - p_start + 1 ));
  END IF;
EXCEPTION
  WHEN NO_DATA_NEEDED THEN
    NULL;
END;
/

注意：在此特定函数中处理 

NO_DATA_NEEDED
异常不是必需的，可以省略。但是，当您处理 
PIPELINED
函数时，最好认识到，如果函数提前终止，则可能需要在函数之后进行清理，并养成包含异常处理的习惯，以便在确实需要时整理一下（即关闭光标等），这样就不会忘记。

然后，对于样本数据：

CREATE TABLE table_name (id, data) AS
SELECT 1, EMPTY_CLOB() || (SELECT LISTAGG('PAR' || LPAD(LEVEL + 14, 6, '0'), ',') WITHIN GROUP (ORDER BY LEVEL)
                           FROM   DUAL
                           CONNECT BY LEVEL <= 40)
                       || ','
                       || (SELECT LISTAGG('PAR' || LPAD(LEVEL + 54, 6, '0'), ',') WITHIN GROUP (ORDER BY LEVEL)
                           FROM   DUAL
                           CONNECT BY LEVEL <= 40)
FROM   DUAL UNION ALL
SELECT 2, EMPTY_CLOB() || ',' FROM DUAL UNION ALL
SELECT 3, EMPTY_CLOB() FROM DUAL UNION ALL
SELECT 4, NULL FROM DUAL;

查询：

SELECT t.id, d.column_value
FROM   table_name t
       CROSS APPLY TABLE(parse_csv(t.data, ',')) d

输出：

身份证 COLUMN_VALUE
1 PAR000015
1 PAR000016
1 PAR000017
... ...
1 PAR000092
1 PAR000093
1 PAR000094
2 空
2 空
3 空

小提琴

0
投票

感谢 MTO 的回复，我创建了程序来测试这一点，如下

CREATE OR REPLACE TYPE PARRAY as table of CLOB;

CREATE OR REPLACE FUNCTION parse_csv(
  i_str    IN  CLOB,
  i_delim  IN  VARCHAR2 DEFAULT ','
) RETURN PARRAY PIPELINED DETERMINISTIC
AS
  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 IS NULL THEN
    RETURN;
  END IF;

  p_end := INSTR( i_str, i_delim, p_start );
  WHILE p_end > 0 LOOP
    PIPE ROW (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
      PIPE ROW (SUBSTR( i_str, p_start, c_len - p_start + 1 ));
  END IF;
EXCEPTION
  WHEN NO_DATA_NEEDED THEN
    NULL;
END;
/

CREATE OR REPLACE PROCEDURE PARSE_CSV_TEST(SearchString IN CLOB, p_cursor OUT   SYS_REFCURSOR) as 
BEGIN

OPEN p_cursor FOR
select * from  TABLE parse_csv(SearchString,','));


END;
/

然后当我通过提供以下代码块的值来测试程序时

DECLARE
    -- Variable declarations
    l_SEARCHSTRING   CLOB;
    l_T_CURSOR       SYS_REFCURSOR;
BEGIN
    -- Variable initializations
    l_SEARCHSTRING :=
        TO_CLOB (
            'PAR000015,PAR000016,PAR000017,PAR000018,PAR000019,PAR000020,PAR000021,PAR000022,PAR000023,PAR000024,PAR000025,PAR000026,PAR000027,PAR000028,PAR000029,PAR000030,PAR000031,PAR000032,PAR000033,PAR000034,PAR000035,PAR000036,PAR000037,PAR000038,PAR000039,PAR000040,PAR000041,PAR000042,PAR000043,PAR000044,PAR000045,PAR000046,PAR000047,PAR000048,PAR000049,PAR000050,PAR000051,PAR000052,PAR000053,PAR000054,PAR000055,PAR000056,PAR000057,PAR000058,PAR000059,PAR000060,PAR000061,PAR000062,PAR000063,PAR000064,PAR000065,PAR000066,PAR000067,PAR000068,PAR000069,PAR000070,PAR000071');

    -- Call
    PARSE_CSV_TEST (SEARCHSTRING   => l_SEARCHSTRING,
                            T_CURSOR       => l_T_CURSOR);

    -- Transaction control
    COMMIT;

    -- Output bind variables, do not modify
     :2 := l_T_CURSOR;
END;

注意：我可以跳过完整的输入值。我按照上述格式传递 4000 个逗号分隔值并收到以下错误 当我运行它时。

ORA-06550：第 9 行，第 13 列：PLS-00172：字符串文字太长

请让我知道逗号分隔值的限制是什么。当我尝试时，这个可以处理 2500 条记录。有什么建议可以解决这个问题吗？

0
投票

感谢大家的回复，我不确定我是否提到过我想在动态sql中调用这个函数。我只是在我的实际大程序中分享了一小部分麻烦的逻辑。在我的实际过程中，有多个带有输入参数的 if else 条件，我不想让提供完整过程的每个人感到困惑。我只是通过仅使用此逻辑创建单独的小过程来使用此定界函数逻辑。这是动态sql逻辑，

CREATE OR REPLACE PROCEDURE PARSE_CSV_TEST (
    SearchString   IN     CLOB,
    p_cursor             OUT SYS_REFCURSOR)
AS
    sqlquery          CLOB; 
BEGIN
    sqlquery :=
           'select * from  TABLE( parse_csv( '''
        || SearchString
        || ''','',''))
       
                ';
    DBMS_OUTPUT.put_line (sqlquery);

    OPEN p_cursor FOR sqlquery;
END PARSE_CSV_TEST;
/

当我传递长逗号分隔符字符串作为输入参数时，这就是我面临的文字太长问题的地方。我什至尝试从 C# 调用这个产品，但它给出了相同的错误。

有任何建议或指正请指正

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