CREATE OR REPLACE FUNCTION SBUSTR(STR_INPUT IN VARCHAR2, LENGTH_INPUT IN NUMBER)
RETURN VARCHAR2 IS
I NUMBER;
SUB_STR VARCHAR2(2000);
SUB_LENGTH NUMBER := 0;
STR_COUNT NUMBER := 0;
TEMP NUMBER := 0;
RETURN_STR VARCHAR2(2000) := '';
BEGIN
SELECT LENGTH(STR_INPUT) INTO SUB_LENGTH FROM DUAL;
FOR I IN 1 .. SUB_LENGTH LOOP
SELECT SUBSTR(STR_INPUT, I, 1) INTO SUB_STR FROM DUAL;
SELECT LENGTHB(SUB_STR) INTO SUB_LENGTH FROM DUAL;
IF (SUB_LENGTH = 1) THEN
TEMP := 1;
ELSE
TEMP := 2;
END IF;
IF (STR_COUNT + TEMP <= LENGTH_INPUT) THEN
IF (SUB_LENGTH = 1) THEN
STR_COUNT := STR_COUNT + 1;
ELSE
STR_COUNT := STR_COUNT + 2;
END IF;
RETURN_STR := RETURN_STR || SUB_STR;
ELSE
EXIT;
END IF;
END LOOP;
RETURN RETURN_STR;
END SBUSTR;
/
标签:SUB,自定义,截取,NUMBER,LENGTH,VARCHAR2,STR,字符串,INPUT From: https://blog.51cto.com/u_16242566/7536827