mysql - 如果存在则更新 MySQL

Question

我正在尝试更新一行(如果存在)，如果它不存在，那么我想在表中执行插入操作。 picture.id 和 picture.picturepath 是唯一的键。我看过一些例子，但我不确定我做错了什么。

我遇到了重复 key 更新，不确定这是否与我想要实现的目标相关。

Error message: 1064- You have an error in your SQL syntax near 'UPDATE picture SET picture.picturecontent = ipicturecontent WHERE picture.id at line 5"


    IF EXISTS( SELECT * FROM picture WHERE picture.id = ipictureid 
    AND picture.picturepath = ipicturepath) THEN

    UPDATE picture 
    SET picture.picturecontent = ipicturecontent
    WHERE picture.id = ipictureid 
    AND picture.picturepath = ipicturepath

    ELSE

    INSERT INTO picture (picture.id, picture.picturecontent,picture.picturepath) VALUES (ipictureid, ipicturecontent, ipicturepath)

Answer 1

https://stackoverflow.com/a/10095812/1287480 <- 信用到期的信用。

INSERT INTO models (col1, col2, col3)
VALUES ('foo', 'bar', 'alpha')
ON DUPLICATE KEY UPDATE col3 = 'alpha';