oracle pl sql for循环

先创建表：

CREATE TABLE TB_USER
(
    ID INTEGER PRIMARY KEY,
    USER_NAME VARCHAR2(20) NOT NULL,
    USER_AGE INTEGER NOT NULL
);

CREATE SEQUENCE SEQ_USER
INCREMENT BY 1
START WITH 1
NOMAXVALUE
NOCYCLE
CACHE 10;

CREATE OR REPLACE TRIGGER TR_USER BEFORE INSERT ON TB_USER FOR EACH ROW
BEGIN
    SELECT SEQ_USER.NEXTVAL INTO :NEW.ID FROM DUAL;
END;

然后用for循环来插入数据：

DECLARE
V_AGE TB_USER.USER_AGE%TYPE;
V_NAME TB_USER.USER_NAME%TYPE;
BEGIN
  FOR I IN 1..100 LOOP
    DBMS_OUTPUT.put_line(I);
    SELECT DBMS_RANDOM.value(1, 100) INTO V_AGE FROM DUAL;
    V_NAME := 'FOR_' || V_AGE;
    INSERT INTO TB_USER(USER_NAME, USER_AGE) VALUES (V_NAME, V_AGE);
  END LOOP;
  COMMIT;
END;

倒序插入数据（从100到1）：

DECLARE
V_AGE TB_USER.USER_AGE%TYPE;
V_NAME TB_USER.USER_NAME%TYPE;
BEGIN
  FOR I IN REVERSE 1..100 LOOP
    DBMS_OUTPUT.put_line(I);
    SELECT DBMS_RANDOM.value(1, 100) INTO V_AGE FROM DUAL;
    V_NAME := 'FOR_REVERSE_' || V_AGE;
    INSERT INTO TB_USER(USER_NAME, USER_AGE) VALUES (V_NAME, V_AGE);
  END LOOP;
  COMMIT;
END;