Thank you Jeff, for the information.
Jeff Butler schrieb:
This is a known bug:
http://issues.apache.org/jira/browse/IBATIS-357
http://issues.apache.org/jira/browse/IBATIS-450
Feel free to attach a patch if you've got one.
I think, my first idea, simply call ResultSet.wasNull() does not work.
The column name attribute of the property element must be ignored in
case of the presence of the resultMap attribute. Maybe it's correct to
first apply the children and if any returns not null, then set foundData
to true. But this is another algorithm.
Jeff Butler
On Thu, Oct 23, 2008 at 6:37 AM, Ingmar Lötzsch
<[EMAIL PROTECTED]> wrote:
Hello,
I found the reason for my problem is the following method in class
ResultMap, line 310:
public Object[] getResults(StatementScope statementScope, ResultSet rs)
throws SQLException {
...
boolean foundData = false;
Object[] columnValues = new Object[getResultMappings().length];
for (int i = 0; i < getResultMappings().length; i++) {
ResultMapping mapping = (ResultMapping) getResultMappings()[i];
errorContext.setMoreInfo(mapping.getErrorString());
if (mapping.getStatementName() != null) {
...
foundData = foundData || columnValues[i] != null;
} else if (mapping.getNestedResultMapName() == null) {
columnValues[i] = getPrimitiveResultMappingValue(rs, mapping);
if (columnValues[i] == null) {
columnValues[i] = doNullMapping(columnValues[i], mapping);
} else {
foundData = true;
}
}
// TODO: add a check for the case
// mapping.getNestedResultMapName() != null
}
statementScope.setRowDataFound(foundData);
return columnValues;
}
The value of foundData remains false, if there are only mappings with nested
result maps. This proceeding assumes that there is no data in this case. But
this assumption seems to be wrong. For the nested result maps one have to
check, if ResultSet.wasNull() returns true, I think.
else {
// check the return value of ResultSet.wasNull()
if (ResultSet.wasNull() has returned false) {
foundDate = true;
}
}
