When the update statement is executed, it is forbidden to modify the …

[sunjun041640]

in mybatis 3.4.x ,

@update(update set name=#{user.name} where id=#{user.id}) void update(UserDO user)

before execute update(UserDO user)
id name
1 A

after execute update(UserDO user)

In application memory，user.id != 1, may be user.id = 2，becase the @update use keyGenerate key, it modify the user.id

[harawata]

We cannot accept this because it breaks backward compatibility.
And please try harder to provide accurate version/code when explaining the issue so that other developers can reproduce the problem.

There is little/inaccurate information, but if you use PostgreSQL, it might be related to #902.
You should try the latest version (3.5.7 at this point).
If you have to use 3.4.x, try 3.4.6.

[sunjun041640]

sorry, we use the database is mysql, mybatis version is 3.4.5

[harawata]

@sunjun041640 ,

I would take a look if you create a small demo project that reproduces the problem and share it on your GitHub repo.
Here are some project templates.