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ORACLE字符拆分函數返回結果集

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Release: 2016-06-07 14:55:19
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ORACLE不能像MSSQL那樣支持直接返回表類型,所以要先創建一種自定義類型。這裏用到的是嵌套表(Nested Table)。 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 -- Nested Table C

ORACLE不能像MSSQL那樣支持直接返回表類型,所以要先創建一種自定義類型。這裏用到的是嵌套表(Nested Table)。

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-- Nested Table

CREATE OR REPLACE TYPE split_str IS TABLE OF VARCHAR(100);

/

 

-- Function

CREATE OR REPLACE FUNCTION fn_Split

(

    p_Str VARCHAR2,

    p_Delimiter VARCHAR2

)

RETURN split_str PIPELINED

AS

    v_Str VARCHAR(4000) := p_Str;

    v_Index NUMBER;

    v_SubLength NUMBER;

BEGIN

    -- p_Delimiter is null

    IF p_Delimiter IS NULL THEN

        FOR x IN 1..LENGTH(v_Str)

        LOOP

            PIPE ROW(SUBSTR(V_Str,x,1));

        END LOOP;

        RETURN;

    END IF;

    

    v_index := INSTR(v_Str,p_Delimiter);

    WHILE v_Index 0

    LOOP

        PIPE ROW(SUBSTR(v_Str,1,v_Index-1));

        v_SubLength := LENGTH(v_Str) - (v_index + LENGTH(p_Delimiter) - 1);

        v_Str := SUBSTR(v_Str,-v_SubLength,v_SubLength);

        v_index := INSTR(v_Str,p_Delimiter);

    END LOOP;

    PIPE ROW(v_Str);

    RETURN;

END;

/

 

-- 調用(第二種方式更好)

SELECT fn_split('This@@is@@it','@@') FROM dual;

SELECT * FROM Table(fn_split('This@@is@@it','@@'));

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