游标遍历的几种方式

1.

-- 定义游标

CURSOR c_Student IS

SELECT ID, FIRST_NAME, LAST_NAME, MAJOR FROM T_TEST_STUDENTS;

-- 遍历游标

OPEN c_Student;

LOOP

FETCH c_Student

INTO v_NewId, v_NewFirstName, v_NewLastName, v_NewMajor;

EXIT WHEN c_Student%NOTFOUND;

INSERT INTO T_TEST_STUDENTS

(ID, FIRST_NAME, LAST_NAME, MAJOR)

VALUES

(v_NewId, v_NewFirstName, v_NewLastName, v_NewMajor);

END LOOP;

CLOSE c_Student;

COMMIT;

2.

-- 定义游标

CURSOR c_Student IS

SELECT ID, FIRST_NAME, LAST_NAME, MAJOR FROM T_TEST_STUDENTS;

-- 遍历游标

FETCH c_Student INTO v_NewId, v_NewFirstName, v_NewLastName, v_NewMajor;

WHILE c_Student%FOUND LOOP

INSERT INTO T_TEST_STUDENTS

(ID, FIRST_NAME, LAST_NAME, MAJOR)

VALUES

(v_NewId, v_NewFirstName, v_NewLastName, v_NewMajor);

FETCH c_Student INTO v_NewId, v_NewFirstName, v_NewLastName, v_NewMajor;

END LOOP;

CLOSE c_Student;

COMMIT;

3.

CURSOR c_Student IS

SELECT ID, FIRST_NAME, LAST_NAME, MAJOR FROM T_TEST_STUDENTS;

FOR v_Student in c_Student LOOP

INSERT INTO T_TEST_STUDENTS

(ID, FIRST_NAME, LAST_NAME, MAJOR)

VALUES

(v_Student.ID, v_Student.FIRST_NAME, v_Student.LAST_NAME, v_Student.MAJOR);

END LOOP;

COMMIT;

4.

/* 不需要定义游标

CURSOR c_Student IS

SELECT ID, FIRST_NAME, LAST_NAME, MAJOR FROM T_TEST_STUDENTS;

*/

FOR v_Student in (SELECT ID, FIRST_NAME, LAST_NAME, MAJOR FROM T_TEST_STUDENTS) LOOP

INSERT INTO T_TEST_STUDENTS

(ID, FIRST_NAME, LAST_NAME, MAJOR)

VALUES

(v_Student.ID, v_Student.FIRST_NAME, v_Student.LAST_NAME, v_Student.MAJOR);

END LOOP;

COMMIT;