[ https://hibernate.onjira.com/browse/HHH-7060?page=com.atlassian.jira.plug... ] John Verhaeg updated HHH-7060: ------------------------------ Description: In particular, there is a disconnect between the value ranges supported by bytes in Java vs. SQL Server: Java byte values are 1 byte, unsigned, while SQL Server values are 0-255. Previously, negative byte values stored in the Java model would be treated as unsigned bytes by the driver, allowing the reading and writing of such values to "work" from the standpoint of the application, but also resulting in a completely different positive value being stored within the database. HHH-6815 addressed this disconnect from the standpoint of ensuring values set in the Java model were kept semantically in tact within the database and forcing the use of SMALLINT columns instead of TINYINT columns for byte values. However, this solution assumes it's important that the database values exactly match what's in the Java model. It also does not allow for existing databases with existing TINYINT columns, which end up experiencing exceptions when negative byte values are persisted and later retrieved. The proposed solution is to offer some type of mode that can be set by the user to indicate the Java model should be treated as authoritative wrt data values, which would cause Hibernate to perform as it did in previous releases. (was: In particular, there is a disconnect between the value ranges supported by bytes in Java vs. SQL Server: Java byte values are 1 byte, unsigned, while SQL Server values are 0-255. Previously, negative byte values stored in the Java model would be treated as unsigned bytes by the driver, allowing the reading and writing of such values to "work" from the standpoint of the application, but also resulting in a completely different positive value being stored within the database. HHH-6815 addressed this disconnect from the standpoint of ensuring values set in the Java model were kept semantically in tact within the database and forcing the use of SMALL_INT columns instead of TINY_INT columns for byte values. However, this solution assumes it's important that the database values exactly match what's in the Java model. It also does not allow for existing databases with existing TINY_INT columns, which end up experiencing exceptions when negative byte values are persisted and later retrieved. The proposed solution is to offer some type of mode that can be set by the user to indicate the Java model should be treated as authoritative wrt data values, which would cause Hibernate to perform as it did in previous releases.) -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira

[ https://hibernate.onjira.com/browse/HHH-7060?page=com.atlassian.jira.plug... ] Guenther Demetz commented on HHH-7060: -------------------------------------- Following the procedure I used to convert tinyint columns into smallint without loosing data (SQLServer2008): alter table MyTable add byteValueTrans smallint null GO update MyTable set byteValueTrans = byteValue where byteValue between 0 and 127 update MyTable set byteValueTrans = byteValue - 256 where byteValue between 128 and 256 GO alter table MyTable drop column byteValue GO sp_rename 'MyTable.byteValueTrans', 'byteValue', 'COLUMN' -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira