知识大全 OracleDML子句RETURNINGINTO

Posted 2022-07-15 文字

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　　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 t ;

　　DROP SEQUENCE t _seq;

　　CREATE TABLE t (

　　id NUMBER( )

　　description VARCHAR ( )

　　CONSTRAINT t _pk PRIMARY KEY (id)

　　);

　　CREATE SEQUENCE t _seq;

　　INSERT INTO t VALUES (t _seq nextval ONE );

　　INSERT INTO t VALUES (t _seq nextval O );

　　INSERT INTO t VALUES (t _seq nextval THREE );

　　MIT;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 t id%TYPE;

　　BEGIN

　　INSERT INTO t VALUES (t _seq nextval FOUR )

　　RETURNING id INTO l_id;

　　MIT;

　　DBMS_OUTPUT put_line( ID= || l_id);

　　END;

　　ID=

　　PL/SQL procedure successfully pleted

　　SQL>The syntax is also available for update and delete statements

　　SET SERVEROUTPUT ON

　　DECLARE

　　l_id t id%TYPE;

　　BEGIN

　　UPDATE t

　　SET description = description

　　WHERE description = FOUR

　　RETURNING id INTO l_id;

　　DBMS_OUTPUT put_line( UPDATE ID= || l_id);

　　DELETE FROM t

　　WHERE description = FOUR

　　RETURNING id INTO l_id;

　　DBMS_OUTPUT put_line( DELETE ID= || l_id);

　　MIT;

　　END;

　　UPDATE ID=

　　DELETE ID=

　　PL/SQL procedure successfully pleted

　　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 t id%TYPE;

　　l_tab t_tab;

　　BEGIN

　　UPDATE t

　　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;

　　MIT;

　　END;

　　UPDATE ID=

　　PL/SQL procedure successfully pleted

　　SQL>We can also use the RETURNING INTO clause in bination with bulk binds

　　SET SERVEROUTPUT ON

　　DECLARE

　　TYPE t_desc_tab IS TABLE OF t description%TYPE;

　　TYPE t_tab IS TABLE OF t %ROWTYPE;

　　l_desc_tab t_desc_tab := t_desc_tab( FIVE SIX SEVEN );

　　l_tab t_tab;

　　BEGIN

　　FORALL i IN l_desc_tab first l_desc_tab last

　　INSERT INTO t VALUES (t _seq nextval l_desc_tab(i))

　　RETURNING id description BULK COLLECT INTO l_tab;

　　FOR i IN l_tab first l_tab last LOOP

　　DBMS_OUTPUT put_line( INSERT ID= || l_tab(i) id ||

　　 DESC= || l_tab(i) description);

　　END LOOP;

　　MIT;

　　END;

　　INSERT ID= DESC=FIVE

　　INSERT ID= DESC=SIX

　　INSERT ID= DESC=SEVEN

　　PL/SQL procedure successfully pleted

　　SQL>This functionality is also available from dymanic SQL

　　SET SERVEROUTPUT ON

　　DECLARE

　　TYPE t_tab IS TABLE OF t id%TYPE;

　　l_tab t_tab;

　　BEGIN

　　EXECUTE IMMEDIATE UPDATE t

　　SET description = description

　　RETURNING id INTO :l_tab

　　RETURNING 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;

　　MIT;

　　END;

　　UPDATE ID=

　　PL/SQL procedure successfully pleted

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