oracle 如何使用collection，自定义split函数

自定义的split函数

//创建类型
CREATE OR REPLACE TYPE "SPLIT_TYPE"          IS TABLE OF VARCHAR2 (4000)
//创建函数
CREATE OR REPLACE FUNCTION SPLIT (
    P_STR       IN VARCHAR2,
    P_DELIMITER IN VARCHAR2 DEFAULT(',') --分隔符，默认逗号
)
    RETURN SPLIT_TYPE
IS
    J INT := 0;
    I INT := 1;
    LEN INT := 0;
    LEN1 INT := 0;
    STR VARCHAR2 (4000);
    MY_SPLIT SPLIT_TYPE := SPLIT_TYPE ();
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);
             MY_SPLIT.EXTEND;
             MY_SPLIT (MY_SPLIT.COUNT) := STR;

            IF I >= LEN
            THEN
                EXIT;
            END IF;
        ELSE
            STR := SUBSTR (P_STR, I, J - I);
            I := J + LEN1;
            MY_SPLIT.EXTEND;
            MY_SPLIT (MY_SPLIT.COUNT) := STR;
        END IF;
    END LOOP;

    RETURN MY_SPLIT;
END SPLIT;

使用split 函数

SELECT SPLIT('name,age,class') FROM DUAL

SELECT * FROM TABLE(SPLIT('name,age,class'))