id1 id21 123qwef 2 111 222 0 wbdhdwzlpmk 无双 0 0 反动言语 2012-2-9 2012-2-9
以上是一条数据,如果id1不存在就添加一条记录,如果id1存在,就根据id1和id2修改该条记录,请问oralce中的sql语句怎么写?
以上是一条数据,如果id1不存在就添加一条记录,如果id1存在,就根据id1和id2修改该条记录,请问oralce中的sql语句怎么写?
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using (select '19995' as t1.id ,'1' as t1.sender_sex,'head' as t1.sender_head,'test' as t1.sender_name,'status' as t1.status
from plp_message) t1
on (t.user_id is not null and t.user_id= t1.user_id and t.bottle_id=t1.bottle_id and t.user_id='111' and t.bottle_id='222')
when matched then
update set t.sender_name='测试数据1',t.content='测试数据2'
when not matched then
insert values(t.id,t.sender_sex,t.sender_head,t.sender_name,t.status)
这样写报错。未找到from关键字
using (select '19995' as t1.id ,'1' as t1.sender_sex,'head' as t1.sender_head,'test' as t1.sender_name,'status' as t1.status
from plp_message) t1
on (t.user_id is not null and t.user_id= t1.user_id and t.bottle_id=t1.bottle_id and t.user_id='111' and t.bottle_id='222')
when matched then
update set t.sender_name='测试数据1',t.content='测试数据2'
when not matched then
insert values(t1.id,t1.sender_sex,t1.sender_head,t1.sender_name,t1.status)
using (select '19995' as id ,'1' as sender_sex,'head' as sender_head,'test' as sender_name,'status' as status
from plp_message) t1
on (t.user_id is not null and t.user_id= t1.user_id and t.bottle_id=t1.bottle_id and t.user_id='111' and t.bottle_id='222')
when matched then
update set t.sender_name='测试数据1',t.content='测试数据2'
when not matched then
insert values(t1.id,t1.sender_sex,t1.sender_head,t1.sender_name,t1.status)
CREATE TABLE T124
(
ID NUMBER(4),
F1 VARCHAR2(20),
F2 VARCHAR2(20)
);
INSERT INTO T124 VALUES(1, 'A', 'AA');
INSERT INTO T124 VALUES(2, 'B', 'BB');
INSERT INTO T124 VALUES(3, 'C', 'CC');
实测结果:
on(d.id=de.id)
when matched then
update set
d.name=de.name
when not matched then
insert (id,name)
values (de.id,de.name);-- 解释
-- *1). Merge into dept_2 d using dept de
-- 从源表 dept (别名 de) 往 dept_2 表(别名d)中插入或更新数据-- *2). on(d.id=de.id) :源表(dept)与目标表(dept_2)的连接条件是 (dept_2.id=dept.id)-- *3). when matched then update set d.name=de.name
-- 当目标表找到与源表匹配的记录行(匹配条件:dept_2.id=dept.id ),
-- 则更新目标表(dept_2) 的 name字段值为 源表 (dept) 的name字段值-- *4). when not matched then insert (id,name) values (de.id,de.name)
-- 如果没有找到匹配记录(即:源表记录的id字段值,在目标表中不存在),
-- 则将源表中这样的记录插入目标表-- 简单理解为一句话:有:则更新;无:则插入!
CREATE TABLE Tbl123
(
ID1 NUMBER(4),
ID2 VARCHAR2(20),
ID3 VARCHAR2(20)
);
INSERT INTO Tbl123 VALUES(1, 'A','123');
INSERT INTO Tbl123 VALUES(2, 'B','1234');
INSERT INTO Tbl123 VALUES(3, 'C','123123');
commit;
declare
sSql varchar2(3000);
iCount number;
v_ID1 number;
v_ID2 varchar2(20);
v_ID3 varchar2(20);
begin
iCount := 0;
v_ID1 := 1;
v_ID3 := 'wee';
sSql := 'begin select count(*) into :1 from Tbl123 where Id1 = :2; end;';
execute immediate sSql using out iCount,in v_ID1;
if iCount > 0 then
sSql := 'begin select distinct Id2 into :1 from Tbl123 where Id1 = :2 and rownum = 1; end;';
execute immediate sSql using out v_ID2,in v_ID1;
sSql := 'begin update Tbl123 set Id3 = :1 where Id1 = :2 and Id2 = :3; end;';
execute immediate sSql using in v_ID3,in v_ID1,in v_ID2;
dbms_output.put_line('update');
else
sSql := 'begin insert into Tbl123(Id1,ID2,Id3) values (:1,:2,:3); end;';
execute immediate sSql using in v_ID1,in v_ID2,in v_ID3;
dbms_output.put_line('insert');
end if;
commit;
exception
when others then
dbms_output.put_line('Error');
end;select * from Tbl123;