oracle 实现 split 函数

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oracle 实现 split 函数

 

CREATE OR REPLACE TYPE ty_str_split IS TABLE OF VARCHAR2 (4000);CREATE OR REPLACE FUNCTION fn_split (p_str IN VARCHAR2, p_delimiter IN VARCHAR2)  RETURN ty_str_splitIS  j INT := 0;  i INT := 1;  len INT := 0;  len1 INT := 0;  str VARCHAR2 (4000);  str_split ty_str_split := ty_str_split ();BEGIN  len := LENGTH (p_str);  len1 := LENGTH (p_delimiter);  WHILE j < len  LOOP    j := INSTR (p_str, p_delimiter, i);    IF j = 0    THEN        j := len;        str := SUBSTR (p_str, i);        str_split.EXTEND;        str_split (str_split.COUNT) := str;        IF i >= len        THEN          EXIT;        END IF;    ELSE        str := SUBSTR (p_str, i, j - i);        i := j + len1;        str_split.EXTEND;        str_split (str_split.COUNT) := str;    END IF;  END LOOP;  RETURN str_split;END fn_split;SELECT DISTINCT * FROM TABLE(fn_split('a,b,c,a,v,c',','));