Issue with Updating Field Value Using MyBatis Dynamic SQL about mybatis-dynamic-sql

[hermer]

I also have the same confusion

[jeffgbutler]

You can do something like this:

int addToBalance(Integer uid, Integer balance) {
  UpdateStatementProvider updateStatement = update(user)
                .set(user.balance).equalTo(add(user.balance, constant(balance.toString())))
                .where(user.uid, isEqualTo(uid))
                .build().render(RenderingStrategies.MYBATIS3);
  ...
}

This isn't exactly what you asked for because the balance is not rendered as a bind parameter - it will be rendered as a constant string.

I will add something to the library that supports rendering this with a bind parameter.

[jeffgbutler]

Starting in version 1.5.1, you can do this:

int addToBalance(Integer uid, Integer balance) {
  UpdateStatementProvider updateStatement = update(user)
                .set(user.balance).equalTo(add(user.balance, value(balance)))
                .where(user.uid, isEqualTo(uid))
                .build().render(RenderingStrategies.MYBATIS3);
  ...
}

The value() function will be released in version 1.5.1. It should be in a snapshot build now.

[hermer]

good job