isEqualTo run before filter ? about mybatis-dynamic-sql

[pondered]

and

mapper.select(dsl -> dsl
            .where(id, isEqualTo(()->dto.getEmployeeId()).filter(Objects.nonNull(dot))));

[jeffgbutler]

In your first example, the exception thrown is probably NonRenderingWhereClauseException. This exception is thrown because you coded a where clause, but the condition didn't render which in this case will cause all rows to be returned. See this page for details about how to configure this behavior: https://mybatis.org/mybatis-dynamic-sql/docs/configuration.html. You can write your statement like this:

mapper.select(dsl -> dsl.configureStatement(c -> c.setNonRenderingWhereClauseAllowed(true))
    .where(id, isEqualTo(employeeId).filter(Objects::nonNull)));

[jeffgbutler]

In your second example, I assume you get a NullPointerException if dto is null. This because the filter can only be applied to the value in the condition - not the object providing the value. You can use a combination of filter and map to achieve your goal:

mapper.select(dsl -> dsl.configureStatement(c -> c.setNonRenderingWhereClauseAllowed(true))
    .where(id, isEqualTo(dto).filter(Objects::nonNull).map(MyDTO::getEmployeeId).filter(Objects::nonNull)));

[pondered]

oh tanks