EnumOrdinalBytehandler is Buggy

[gmixa]

About the Bug...

• I have checked that this issue has not already been reported.

• I have confirmed this bug exists on the latest version of MyBatis.

• I have confirmed this bug reproduces without 3rd party extensions (e.g. mybatis-plus).

Database Version

All

JDBC Driver Version

All

Issue Description

The first enum in Java has the ordinal value 0.
Instead of mapping the value 0 to the first enum the EnumOrdinalTypeHandler maps to null.
Code lines 50 and 59 check if ordinal == null and then return null. That’s definitely wrong.

About your report...

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• I checked the Preview and my report looks awesome! 👍

[harawata]

Hello @gmixa ,

I assume you are referring to this part of the code.

mybatis-3/src/main/java/org/apache/ibatis/type/EnumOrdinalTypeHandler.java

Lines 49 to 52 in 433e313

	int ordinal = rs.getInt(columnName);
	if (ordinal == 0 && rs.wasNull()) {
	return null;
	}

It returns null when the column is NULL, not zero.

If you still believe there is a bug, please provide a small executable project like these.
Be sure to include proper assertions in the test so that we can understand the expected/actual behaviors.

Thank you.