oracle merge语句

merge into 表名 a using

(select ? as 字段1,? as 字段2,..... from dual)

b on (a.字段1=b.字段1 and ....)（判断的条件）

when matched then

update set 字段1=字段1,......

when not matched then

insert (字段1,字段2,...) values(b.字段1,b.字段2,....)

例子如下：表名：TR_RUNNING_MONITOR ；字段名：LAST_TASK_ROWID，LAST_CRAWL_DATE，START_TIME，DOC_COUNT，HIT_COUNT，OP_TYPE，DOC_TYPE

merge into TR_RUNNING_MONITOR a using
(select ? as LAST_TASK_ROWID,? as LAST_CRAWL_DATE,? as START_TIME,? as DOC_COUNT,? as HIT_COUNT,? as OP_TYPE,? as DOC_TYPE,sysdate as  UPDATE_TIME from dual) b on (a.OP_TYPE=b.OP_TYPE and a.DOC_TYPE=b.DOC_TYPE) when matched then
update set DOC_COUNT=DOC_COUNT,HIT_COUNT=HIT_COUNT,START_TIME=START_TIME,UPDATE_TIME=UPDATE_TIME,
LAST_CRAWL_DATE=LAST_CRAWL_DATE,LAST_TASK_ROWID=LAST_TASK_ROWID when not matched then
insert (OP_TYPE,DOC_TYPE,DOC_COUNT,HIT_COUNT,START_TIME,UPDATE_TIME,LAST_CRAWL_DATE,LAST_TASK_ROWID)
values(b.OP_TYPE,b.DOC_TYPE,b.DOC_COUNT,b.HIT_COUNT,b.START_TIME,b.UPDATE_TIME,b.LAST_CRAWL_DATE,b.LAST_TASK_ROWID)

说明：用OP_TYPE和DOC_TYPE跟表TR_RUNNING_MONITOR中的这两个字段比较，相同时进行update，不同时进行insert