CODEWITHSUNDEEP
hibernatemigrationdialect
Kwangyong Kim
Kwangyong Kim

Reputation: 11

How can I override SQL datatype mapping (ENUM) on MySQL?

I'm upgrading the Hibernate version from 5.x to 6.4 in my application.

When I upgraded to the latest Hibernate version (6.4), The DDL validation step was broken. During upgrading job, I noticed that Hibernate 6.2 changed the SQL data type mapping for ENUM on MySQL.

To work around this issue, I created a custom Dialect and overrode the contributeTypes method as follows:

    @Override
    public void contributeTypes(TypeContributions typeContributions, ServiceRegistry serviceRegistry) {
        super.contributeTypes(typeContributions, serviceRegistry);

        DdlTypeRegistry ddlTypeRegistry = typeContributions.getTypeConfiguration().getDdlTypeRegistry();
        DdlType varcharType = ddlTypeRegistry.getDescriptor(SqlTypes.VARCHAR);
        ddlTypeRegistry.addDescriptor(SqlTypes.ENUM, varcharType);

        JdbcTypeRegistry jdbcTypeRegistry = typeContributions.getTypeConfiguration().getJdbcTypeRegistry();
        jdbcTypeRegistry.addDescriptor(SqlTypes.ENUM, VarcharJdbcType.INSTANCE);
    }

This approach seems to work correctly. However, I'm unsure whether creating a custom Dialect class is the recommended way to handle this type of mapping issue, or if there is a better practice I should follow.

Is creating a custom Dialect an excessive solution for this problem? Are there any potential issues or gotchas I should be aware of with this approach, such as compatibility concerns with future Hibernate/JPA versions?

I'd appreciate any insights or recommendations from those with more experience in this area.

Upvotes: 0

Views: 93

Answers (0)

Related Questions