RETURNING 自己通常结合DML 语句使用。(INSERT UPDATE DELETE)
使用方法:
UPDATE table_name SET expr1 RETURNING column_name INTO xxx
INSERT: 返回的是添加后的值
UPDATE:返回时更新后的值
DELETE:返回删除前的值
RETURNING 可以再sqlplus 和plsql中使用
如果是plsql就如上面的代码,xxx为声明的变量名
如果是sqlplus,xxx 可以为变量,即
VARIABLE var_name varchar2(10) UPDATE table_name SET expr1 RETURNING column_name INTO :var_name;
这里的 :var_name 使用的是绑定变量
另外,RETURNING 貌似可以与 RETURN通用
INSERT INTO VALUES 支持 RETURNING
INSERT INTO SELECT、 和MERGE 语句 不支持 RETURNING
例子1:
建表语句:
CREATE TABLE TEST111( A1 VARCHAR(10), A2 VARCHAR(20) ); CREATE SEQUENCE TEST111_S1 START WITH 1 INCREMENT BY 1 CACHE 20 MAXVALUE 999999999999999999999999999 CYCLE;
DECLARE SEQ NUMBER; BEGIN INSERT INTO TEST111 VALUES(TEST111_S1.NEXTVAL,'AAA2') RETURNING A1 INTO SEQ; DBMS_OUTPUT.PUT_LINE(SEQ); END; DECLARE SEQ NUMBER; BEGIN INSERT INTO TEST111 VALUES(TEST111_S1.NEXTVAL,'AAA3'); SELECT TEST111_S1.CURRVAL INTO SEQ FROM DUAL; COMMIT; DBMS_OUTPUT.PUT_LINE(SEQ); END;
例子2:
再另外,RETURNING 可以与BULK COLLECT 结合(批量绑定, 另外一个是 FORALL)
DECLARE TYPE table_type IS TABLE OF column_name%TYPE; v_tab table_type; BEGIN UPDATE table_name SET expr1 RETURNING column_name BULK COLLECT INTO v_tab; FOR i IN v_tab.first .. v_tab.last LOOP DBMS_OUTPUT.put_line( l_tab(i)); END LOOP; COMMIT; END;
ORA-06547:INSERT,UPDATE或DELETE语句必须使用RETURNING子句
产生这个错误的原因:
returning into子句作用于insert,update,delete,上而select则不行,应该用into。
报错的存储如下:
create or replace procedure p_stu_info(s_id number, s_name varchar2) is v_name varchar2(10); v_age number; v_ErrMsg varchar2(200); begin execute immediate 'select name,age from student_test where id=:1 and name=:2' using s_id, s_name returning into v_name, v_age; dbms_output.put_line(v_name || '的年龄为:' || to_char(v_age)); exception when others then v_ErrMsg := SUBSTRB(SQLERRM, 1, 200); dbms_output.put_line('找不到相应学生'); end p_stu_info;
改成下面这样就ok了:
create or replace procedure p_stu_info(s_id number, s_name varchar2) is v_name varchar2(10); v_age number; v_ErrMsg varchar2(200); begin execute immediate 'select name,age from student_test where id=:1 and name=:2' into v_name, v_age using s_id, s_name; dbms_output.put_line(v_name || '的年龄为:' || to_char(v_age)); exception when others then v_ErrMsg := SUBSTRB(SQLERRM, 1, 200); dbms_output.put_line('找不到相应学生,错误原因:'||v_ErrMsg); end p_stu_info;