Oracle 自定义split 函数
Oracle没有提供split函数，但可以自己建立一个函数实现此功能。比如“abc defg hijkl nmopqr stuvw xyz”，分隔符是空格，但空格个数不定。
源代码：
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CREATE OR REPLACE TYPE ty_str_split IS TABLE OF VARCHAR2 (4000);
CREATE OR REPLACE FUNCTION fn_var_split (
p_str IN VARCHAR2,
p_delimiter IN VARCHAR2
)
RETURN ty_str_split
IS
j INT := 0;
len INT := 0;
str VARCHAR2 (4000);
str_split ty_str_split := ty_str_split ();
v_str VARCHAR2 (4000) := RTRIM (LTRIM (p_str, p_delimiter), p_delimiter);
BEGIN
len := LENGTH (v_str);
WHILE len > 0
LOOP
j := INSTR (v_str, p_delimiter, 1);
IF j = 0
THEN
str := SUBSTR (v_str, 1);
len := 0;
str_split.EXTEND;
str_split (str_split.COUNT) := str;
ELSE
str := SUBSTR (v_str, 1, j - 1);
v_str := LTRIM (LTRIM (v_str, str), p_delimiter);
len := LENGTH (v_str);
str_split.EXTEND;
str_split (str_split.COUNT) := str;
END IF;
END LOOP;
RETURN str_split;
END fn_var_split;
/
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测试：
结果：
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1
12
123
1234
12345
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DECLARE
CURSOR c
IS
SELECT * FROM TABLE (CAST (fn_var_split (';1;12;;123;;;1234;;;;12345;', ';') AS ty_str_split));
r c%ROWTYPE;
BEGIN
OPEN c;
LOOP
FETCH c INTO r;
EXIT WHEN c%NOTFOUND;
DBMS_OUTPUT.put_line (r.column_value);
END LOOP;
CLOSE c;
END;
/
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