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https://issues.apache.org/jira/browse/DBUTILS-42?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12564404#action_12564404
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Julien Aymé commented on DBUTILS-42:
------------------------------------
By looking through the subversion repository, I found that in DbUtils 1.0 only
rs.getObject(index) was used, which effectively returned <code>null</code> when
the value is SQL NULL.
The problem is that some database, when using getObject, will return a
BigInteger instead of a Long (for example), so I assume that this was the (a)
reason for which the method getLong has been used instead of getObject.
A simple fix could be:
Object res = new Long(rs.getLong(index));
return rs.wasNull() ? null : res;
(And generalize the given code for all the different types in the method
processColumn).
I will provide the corresponding patch this evening (cannot use svn:checkout at
my current place, only have a web browser).
Julien
> Object with Long or Decimal got initial zero value while database field is
> null
> -------------------------------------------------------------------------------
>
> Key: DBUTILS-42
> URL: https://issues.apache.org/jira/browse/DBUTILS-42
> Project: Commons DbUtils
> Issue Type: Improvement
> Affects Versions: 1.1
> Environment: JDK 5.0, MSSQL 2000
> Reporter: Matt Jiang
>
> While I use dbutil1.1, I got a big different implementation betweeb 1.0 and
> 1.1.
> Given a Java object, it has a property with Long data type; mapping to
> database, its table field datatype is bigint.
> If it has a record and its value is null.
> In 1.0 implementation, if I load entity, then we can see the property in Java
> object is also null.
> But in 1.1 implementation, the Java object will got a Long object with 0
> inside.
> This behavior change does big impact if I upgrade from 1.0 to 1.1. It might
> make application logic fail because origional null status now become a
> Long(0) value to map to null value in database.
> I suggest to change it back. If null value in database, then mapped Java
> object should be null as well, not new a Long(0) to be a initial value.
> Below is the code snapshot I used to execute query, and I use jTDS 1.2 as
> JDBC driver
> public List<E> executePreparedQuery(String sql, Object[] params, Class clazz)
> throws SQLException {
>
> Connection cnct = getConnection();
> QueryRunner qRunner = new QueryRunner();
> ResultSetHandler rsHandler = new BeanListHandler(clazz);
> List<E> entities = null;
> try {
> convertDateIn(params);
> entities = (List<E>) qRunner.query(cnct, sql, params, rsHandler);
> }
> catch (SQLException e) {
> e.printStackTrace();
> throw e;
> }
> finally {
> closeConnection();
> }
> return entities;
> }
> Hope this helps.
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