About using MySQL syntax ON DUPLICATE KEY UPDATE single update and increase the lot size sql update

Scenario:

        In practical applications, the ability to import data is often encountered, when imported data does not exist add, update is performed with a modification,

In just the encounter, the first reaction is to achieve divided into two, namely, to determine the increase, judging update later found in mysql ON DUPLICATE KEY UPDATE step can be completed, the feeling is too convenient,

This statement is based on the use of unique primary key or index, such as a field is added a unique index, and the table already exists a record is 1.

such as:

The following two statements have the same effect:

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 can be put behind a plurality of fields, separated by commas.

Reproducing an example:

INSERT INTO table (a,b,c) VALUES (1,2,3),(4,5,6)  ON DUPLICATE KEY UPDATE c=VALUES(a)+VALUES(b);  

The table will change (increase or modify) the two records.

Carried out in a single increase or modify sql mybatis wording is:

<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>

sql batch in mybatis added or modified as follows:

<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>