Error passing parameters and retrieving key value result set - mybatis

Question

I'm having problems understanding how MyBatis maps parameters passed in, and then marshalling the results back to the caller. I'd like to pass a POJO in, use properties set in there as part of the query and pass the results back in a map form.
My Mapping file function (without using the parameters):
<select id="getTotalUniqueUserDetails"
resultType="map"
parameterType="RequestFilter">
select KEY,sum(SINGLE_VALUE) as TOTAL from (
select schut.user_type_name as KEY, schuc.usage_count AS SINGLE_VALUE
from usage_count schuc
left join users schu
on schuc.user_key=schu.user_key
left join user_types schut
on schut.user_type_id=schu.user_type_id
)
GROUP by KEY;
</select>
My Mapping file function (with the parameters)
<select id="getTotalUniqueUserDetails"
resultType="map"
parameterType="RequestFilter">
select KEY,sum(SINGLE_VALUE) as TOTAL from (
select schut.user_type_name as KEY, schuc.usage_count AS SINGLE_VALUE
from usage_count schuc
left join users schu
on schuc.user_key=schu.user_key
left join user_types schut
on schut.user_type_id=schu.user_type_id
where schuc.year_month between
to_date('#{fromDate}','yyyy-mm-dd')
and to_date('#{toDate}','yyyy-mm-dd')
)
GROUP by KEY;
</select>
My mapper interface
public interface TotalUniqueUsers {
Object getTotalUniqueUserDetails(RequestFilter filter);
}
public class RequestFilter {
private String fromDate;
private String toDate;
... getters and setters for both above
}
The code that calls the query:
SqlSession sqlSession = DBConnection.getInstance().getSqlSession();
System.out.println("####"+filter.getFromDate());
System.out.println("####"+filter.getToDate());
TotalUniqueUsers testMapper = sqlSession.getMapper(TotalUniqueUsers.class);
return testMapper.getTotalUniqueUserDetails(filter);
With no parameters used in mapping file I get this error:
## The error occurred while setting parameters
### SQL: select KEY,sum(SINGLE_VALUE) as TOTAL from ( select schut.user_type_name as KEY, schuc.usage_count AS SINGLE_VALUE from usage_count schuc left join users schu on schuc.user_key=schu.user_key left join user_types schut on schut.user_type_id=schu.user_type_id ) GROUP by KEY;
### Cause: java.sql.SQLSyntaxErrorException: ORA-00933: SQL command not properly ended
With parameters referenced in mapping file I get this error:
### Cause: org.apache.ibatis.type.TypeException: Could not set parameters for mapping: ParameterMapping{property='fromDate', mode=IN, javaType=class java.lang.String, jdbcType=null, numericScale=null, resultMapId='null', jdbcTypeName='null', expression='null'}. Cause: org.apache.ibatis.type.TypeException: Error setting non null for parameter #1 with JdbcType null . Try setting a different JdbcType for this parameter or a different configuration property. Cause: java.sql.SQLException: Invalid column index
If you've read this much, thank you from the Woodsman.
In short, if I use the parameter passed in the object, it says it can't use a null value. If I don't then it gives me some other error.
The result set should be something like
KEY TOTAL
GROUP1 33
GROUP2 55
I was hoping I could just let it stuff the result set into a map, with the keys being "GROUP1", "GROUP2", with their respective values.
Please tell me how to properly refer to the properties in the object in the map and how to marshall it back. Should I use a custom object?

Answer 1

You need to remove...
The semicolon at the end of the statement. Although not all drivers reject it, it is a common cause for ORA-00933 with Oracle's JDBC driver.
The single quotes surrounding the parameter placeholders e.g. '#{toDate}' to #{toDate}.
With single quotes, the first argument of to_date function becomes a literal instead of a java.sql.PreparedStatement placeholder (e.g. to_date('?', 'yyyy-mm-dd') instead of to_date(?, 'yyyy-mm-dd')). When MyBatis tries to call PreparedStatement#setString(int parameterIndex, String parameterValue), there is no placeholder in the statement and the driver throws the exception.