Oracle RETURNING INTO 用法示例

The RETURNING INTO clause allows us to return column values for rows affected by DML statements. The following test table is used to demonstrate this clause.
DROP TABLE t1;
DROP SEQUENCE t1_seq;
CREATE TABLE t1 (
id NUMBER(10),
description VARCHAR2(50),
CONSTRAINT t1_pk PRIMARY KEY (id)
);
CREATE SEQUENCE t1_seq;
INSERT INTO t1 VALUES (t1_seq.nextval, 'ONE');
INSERT INTO t1 VALUES (t1_seq.nextval, 'TWO');
INSERT INTO t1 VALUES (t1_seq.nextval, 'THREE');
COMMIT;
When we insert data using a sequence to generate our primary key value, we can return the primary key value as follows.
SET SERVEROUTPUT ON
DECLARE
l_id t1.id%TYPE;
BEGIN
INSERT INTO t1 VALUES (t1_seq.nextval, 'FOUR')
RETURNING id INTO l_id;
COMMIT;
DBMS_OUTPUT.put_line('ID=' || l_id);
END;
/
ID=4
PL/SQL procedure successfully completed.
SQL>
The syntax is also available for update and delete statements.
SET SERVEROUTPUT ON
DECLARE
l_id t1.id%TYPE;
BEGIN
UPDATE t1
SET description = description
WHERE description = 'FOUR'
RETURNING id INTO l_id;
DBMS_OUTPUT.put_line('UPDATE ID=' || l_id);
DELETE from t1
WHERE description = 'FOUR'
RETURNING id INTO l_id;
DBMS_OUTPUT.put_line('DELETE ID=' || l_id);
COMMIT;
END;
/
UPDATE ID=4
DELETE ID=4
PL/SQL procedure successfully completed.
SQL>
When DML affects multiple rows we can still use the RETURNING INTO, but now we must return the values into a collection using the BULK COLLECT clause.
SET SERVEROUTPUT ON
DECLARE
TYPE t_tab IS TABLE OF t1.id%TYPE;
l_tab t_tab;
BEGIN
UPDATE t1
SET description = description
RETURNING id BULK COLLECT INTO l_tab;
FOR i IN l_tab.first .. l_tab.last LOOP
DBMS_OUTPUT.put_line('UPDATE ID=' || l_tab(i));
END LOOP;
COMMIT;
END;
/
UPDATE ID=1
UPDATE ID=2
UPDATE ID=3
PL/SQL procedure successfully completed.
SQL>
We can also use the RETURNING INTO clause in combination with bulk binds.
SET SERVEROUTPUT ON