InvalidCastException while getting object out of the cache
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Key: IBATISNET-221
URL: https://issues.apache.org/jira/browse/IBATISNET-221
Project: iBatis for .NET
Issue Type: Bug
Components: DataMapper
Environment: IBatis.net SVN, revision 527493, .Net 2.0
Reporter: Rogelio J. Baucells
Priority: Critical
There is a problem in the implementation of
CachingStatement::ExecuteQueryForObject for .Net2.0. The following scenario
triggers the InvalidCastException:
- Create a <ResultMap>, <procedure>, <parameterMap> and <cacheModel> for a
select statement.
- Invoke the statement with parameters that does not return any results
- Invoke the same statement again
The first invocation will store a NULL_OBJECT in the cache for this key
(CacheModel::this[CacheKey key]), the second statement will retrieve the
NULL_OBJECT from the cache and will cause the InvalidCastException at:
obj = (T)this.Statement.CacheModel[cacheKey];
Also the next statement will never be TRUE since obj is of type T:
if ((object)obj == CacheModel.NULL_OBJECT)
The solution for this problem would be declaring obj as object and casting to T
at the time of returning from the method, something like:
object obj = null;
...
return (T)obj;
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