Oracle 自定義split 函數
Oracle沒有提供split函數，但可以自己建立一個函數實現此功能。比如“abc defg hijkl nmopqr stuvw xyz”，分隔符是空格，但空格個數不定。
源代碼：
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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_splitIS 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;/ |
測試：
結果：
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112123123412345 |
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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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