INSERT INTO table (a,b,c) VALUES (1,2,3)
ON DUPLICATE KEY UPDATE c=c+1;
UPDATE table SET c=c+1 WHERE a=1;
ON DUPLICATE KEY UPDATE后面可以放多个字段，用英文逗号分割。
再现一个例子：
INSERT INTO table (a,b,c) VALUES (1,2,3),(4,5,6)
ON DUPLICATE KEY UPDATE c=VALUES(a)+VALUES(b); 表中将更改（增加或修改）两条记录。
在mybatis中进行单个增加或修改sql的写法为：
<insert id="insertOrUpdateCameraInfoByOne" paramerType="com.pojo.AreaInfo">
insert into camera_info( cameraId,zone1Id,zone1Name,zone2Id,zone2Name,zone3Id,zone3Name,zone4Id,zone4Name）
VALUES(
#{cameraId},#{zone1Id},#{zone1Name}, #{zone2Id},
#{zone2Name}, #{zone3Id}, #{zone3Name},
#{zone4Id}, #{zone4Name},)
ON DUPLICATE KEY UPDATE
cameraId = VALUES(cameraId),
zone1Id = VALUES(zone1Id),zone1Name = VALUES(zone1Name),
zone2Id = VALUES(zone2Id),zone2Name = VALUES(zone2Name),
zone3Id = VALUES(zone3Id),zone3Name = VALUES(zone3Name),
zone4Id = VALUES(zone4Id),zone4Name = VALUES(zone4Name)
</insert>
在mybatis中进行批量增加或修改的sql为：
<insert id="insertOrUpdateCameraInfoByBatch" parameterType="java.util.List">
insert into camera_info(
zone1Id,zone1Name,zone2Id,zone2Name,zone3Id,zone3Name,zone4Id,zone4Name,
cameraId
)VALUES
<foreach collection ="list" item="cameraInfo" index= "index" separator =",">
(
#{cameraInfo.zone1Id}, #{cameraInfo.zone1Name}, #{cameraInfo.zone2Id},
#{cameraInfo.zone2Name}, #{cameraInfo.zone3Id}, #{cameraInfo.zone3Name},
#{cameraInfo.zone4Id}, #{cameraInfo.zone4Name},
#{cameraInfo.cameraId},
)
</foreach>
ON DUPLICATE KEY UPDATE
zone1Id = VALUES(zone1Id),zone1Name = VALUES(zone1Name),zone2Id = VALUES(zone2Id),
zone2Name = VALUES(zone2Name),zone3Id = VALUES(zone3Id),zone3Name = VALUES(zone3Name),
zone4Id = VALUES(zone4Id),zone4Name = VALUES(zone4Name),
cameraId = VALUES(cameraId)
</insert>
