Feature request of add exception tag in xml

[葛俊]

Hi Mybatis Contributors.

I'm thinking of add exception tag to mybatis xml fragment like following.

When sometime we want to throw exception from sql when some condition can't match.

I know it can be done from java code, but it may be more straightforward if we use it in sql.

we could throw an runtimeException with the message like MybatisCoditionNotMatchException.

how do you think of it.  please share your opinion. If most approve it, I can make a pull request for it.

Thanks.

[Ray Sprinkle]

I think that argument validation belongs in the Java code.  Using default methods you could even add the test to the mapper interface.

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[葛俊]

Thanks rds.

Using default method can solve the problem for if test statement.

For choose when statement, using exception tag may help for less code in java like following.

Thanks.

On Friday, October 18, 2019 at 6:28:41 PM UTC+8, rds wrote:

I think that argument validation belongs in the Java code.  Using default methods you could even add the test to the mapper interface.

On Thu, Oct 17, 2019, 11:25 PM 葛俊 <gejun...@gmail.com> wrote:

Hi Mybatis Contributors.

I'm thinking of add exception tag to mybatis xml fragment like following.

When sometime we want to throw exception from sql when some condition can't match.

I know it can be done from java code, but it may be more straightforward if we use it in sql.

we could throw an runtimeException with the message like MybatisCoditionNotMatchException.

how do you think of it.  please share your opinion. If most approve it, I can make a pull request for it.

Thanks.

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[Ray Sprinkle]

My bigger point is that the argument object should be responsible validating the legal parameters and throwing the exception.  That will also result in the exception being thrown when the problem occurs.

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[葛俊]

Thanks for clarifying.

Understand. Agree for your opinion.

Thanks.

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