Hiya
I am working on an ongoing project that uses Ibatis to an AS/400, mapping each
table to an Ibatis object, with simple "get" and "getAll" type of Selects, and
all is well. But now I need to do something more complex using SQL's SUM and
GROUP BY functions, and I can't seem to make it work for me...
In my sqlMap XML file, I have a resultMap for the full object that represents
my file, and queries on that. Like this :
<resultMap id="ledgerResult" class=".....LedgerIbatis">
<result column= "BCUS" property = "customerRef" />
<result column= "BCMP" property = "companyCode" />
<result column= "BDPT" property = "departmentCode" />
<result column= "BVAL" property = "value" />
</resultMap>
<select id="getLedgersForCustomer"
parameterClass="java.util.HashMap"
resultMap="LedgerResult"
resultClass="uk.co.....LedgerIbatis">
<![CDATA[
select '$library$' as library,
BCUS,
BCMP,
BDPT,
BVAL
from
$library$/FILENAME
where BCUS = #customerRef#
]]>
</select>
With a Java object called LedgerIbatis that has a property for every item
above, ie library, customerRef,companyCode, departmentCode and value. And this
works fine!
Now I need to add a cut-down object that just represents several keys, plus a
total value. I need to get the total value for every unique combination of
companyCode and departmentCode for a given customerRef. So, this is what I'm
trying to do here :
<resultMap id="ledgerTotalsResult" class="uk.co......LedgerTotalsIbatis">
<result column= "BCUS" property = "customerRef" />
<result column= "BCMP" property = "companyCode" />
<result column= "BDPT" property = "departmentCode" />
</resultMap>
With a Java object LedgerTotalsIbatis that has these properties : library,
customerRef,companyCode, departmentCode and valueTotal (to hold the new total
value). And I'm trying this query :
<select id="getLedgerTotals"
parameterClass="java.util.HashMap"
resultMap="ledgerTotalsResult"
resultClass="uk.co......LedgerTotalsIbatis">
select '$library$' as library,
BCMP as companyCode,
BDPT as departmentCode,
SUM(BVAL) as valueTotal
from
from
$library$/FILENAME
where BCUS = #customerRef#
group by
BCMP,
BDPT
</select>
I'm hoping for one row for every unique combination of companyCode &
departmentCode that exists for my customerRef, holding the total value of all
the entries with that key combination. What I'm getting is an "An undefined
column name was detected" errormessage!
com.ibatis.common.jdbc.exception.NestedSQLException:
--- The error occurred in /..../Ledger.xml.
--- The error occurred while applying a result map.
--- Check the Ledger.ledgerTotalsResult.
--- Check the result mapping for the 'companyCode' property.
--- Cause: java.sql.SQLException: An undefined column name was detected.
Caused by: java.sql.SQLException: An undefined column name was detected.
at
com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.executeQueryWithCallback(GeneralStatement.java:185)
at
com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.executeQueryForList(GeneralStatement.java:123)
etc, etc
And I don't see why this should be, as I'm clearly mapping the companyCode
property. And I know that I can explicitly set a value in the ResultMap (and
thus the Java object) that's not in the AS/400 table, as we do that with the
library value...
Anyone have a clue what's going on here, or how I shoud proceed for the best?
I'm hoping to do all this work in the SQL, rather than with embedded resultMaps
and other specific Ibatis features, as this query will later have to be more
elaborate, taking data from more than one file, etc.
Cheers
Tracey Annison
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