Question

我有以下代码。事情是SELECT LAST_INSERT_ID（）这总是返回最后插入的行。如果在获取最后一行之前实际插入了一行，或者我再次执行一个select语句，我可以使用INSERT IGNORE进行检查，例如。

SET _inserted_geolocation_id  =(SELECT id FROM geolocation where latitude= _geolocation_latitude AND longitude = _geolocation_longitude
    AND zoom = _geolocation_zoom AND yaw = _geolocation_yaw AND pitch =_geolocation_pitch);

BEGIN

DECLARE _inserted_geolocation_id int;

INSERT IGNORE INTO geolocation (latitude, longitude, zoom, yaw, pitch) 
VALUES (_geolocation_latitude, _geolocation_longitude, _geolocation_zoom, _geolocation_yaw, _geolocation_pitch);

/*SET _inserted_geolocation_id  = (SELECT LAST_INSERT_ID());*/
SET _inserted_geolocation_id  =(SELECT id FROM geolocation where latitude= _geolocation_latitude AND longitude = _geolocation_longitude
    AND zoom = _geolocation_zoom AND yaw = _geolocation_yaw AND pitch =_geolocation_pitch);

SELECT _inserted_geolocation_id;
END

Answer 1

如果LAST_INSERT_ID()未插入任何行，

INSERT IGNORE将返回0，请参阅Documentation：

如果使用INSERT IGNORE并忽略该行，则为AUTO_INCREMENT 计数器没有递增，LAST_INSERT_ID（）返回0，这反映没有插入行。

INSERT IGNORE INTO SELECT LAST_INSERT_ID（）

1 个答案: