INSERT … ON DUPLICATE KEY UPDATE
If you specify ON DUPLICATE KEY UPDATE, and a row is inserted that would cause a duplicate value in a UNIQUE index or PRIMARY KEY, MySQL performs an UPDATE of the old row. For example, if column a is declared as UNIQUE and contains the value 1, the following two statements have similar 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;
(The effects are not identical for an InnoDB table where a is an auto-increment column. With an auto-increment column, an INSERT statement increases the auto-increment value but UPDATE does not.)
The ON DUPLICATE KEY UPDATE clause can contain multiple column assignments, separated by commas. for example ,
INSERT INTO t_vehicle
(vehicle_id,
model_id,
vehicle_no,
frame_no,
engine_no
)
VALUES
(1, 2522, ‘456’, ‘789’, ‘012’) ON DUPLICATE KEY UPDATE
vehicle_id = 1 , frame_no = ‘123’ , vehicle_no = ‘323’;
如果行作为新记录被插入,则受影响行的值为1;如果原有的记录被更新,则受影响行的值为2。
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