Java returning different result from SQL when running identical query

Question

I have an SQL statement written in Java (netbeans/uncanaccess) that is a fairly simple select statement with a few IIF and SUM from one table in my database.

When I run the SQL statement in Access it returns the correct results, however when I have tried to run it in Java, it returns results that are similar, but not exactly the same.

Java Code

public int getActualMHDetails(String strNumber, String strYear, String strPeriod){
    String strSQLString = null;
    System.out.println("Getting cost details for: " + strNumber);
    try{

strSQLString = "SELECT tblExportCost.ProjDef, tblExportCost.Year,\n"
                        + "Sum(IIf([Per]=1,[Val/ObjCur],0)) AS Jan, Sum(IIf([Per]=2,[Val/ObjCur],0)) AS Feb, Sum(IIf([Per]=3,[Val/ObjCur],0)) AS Mar,\n"
                        + "Sum(IIf([Per]=4,[Val/ObjCur],0)) AS Apr, Sum(IIf([Per]=5,[Val/ObjCur],0)) AS May, Sum(IIf([Per]=6,[Val/ObjCur],0)) AS Jun,\n"
                        + "Sum(IIf([Per]=7,[Val/ObjCur],0)) AS Jul, Sum(IIf([Per]=8,[Val/ObjCur],0)) AS Aug, Sum(IIf([Per]=9,[Val/ObjCur],0)) AS Sep,\n"
                        + "Sum(IIf([Per]=10,[Val/ObjCur],0)) AS Oct, Sum(IIf([Per]=11,[Val/ObjCur],0)) AS Nov, Sum(IIf([Per]=12,[Val/ObjCur],0)) AS Dec\n" 
                        + "FROM tblExportCost\n" 
                        + "GROUP BY tblExportCost.ProjDef, tblExportCost.Year, tblExportCost.Year\n" 
                        + "HAVING (((tblExportCost.Year)= '" + strYear + "') AND ((tblExportCost.ProjDef)= 'T3415" + strNumber + "'))";

//SETTING PREPARED STATEMENT
        PreparedStatement preStatement = con.prepareStatement(strSQLString, ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);

        ResultSet rs = preStatement.executeQuery();

        rs.next();

        //IF CHECKS TO MAKE SURE RECORDS
        if(rs.getRow()==0){
            rs.close();      
            preStatement.close();
            return 3;
        }        

        strTest = rs.getString("Jan");

        System.out.println("Test Value: " + strTest); 

        intAMHCJan = rs.getInt("Jan");
        intAMHCFeb = rs.getInt("Feb");
        intAMHCMar = rs.getInt("Mar");
        intAMHCApr = rs.getInt("Apr");
        intAMHCMay = rs.getInt("May");
        intAMHCJun = rs.getInt("Jun");
        intAMHCJul = rs.getInt("Jul");
        intAMHCAug = rs.getInt("Aug");
        intAMHCSep = rs.getInt("Sep");
        intAMHCOct = rs.getInt("Oct");
        intAMHCNov = rs.getInt("Nov");
        intAMHCDec = rs.getInt("Dec");

        //CLOSES CONNECTIONS
        System.out.println("Database query successful; closing connections");
        rs.close();
        preStatement.close();            

        return 1;

    }catch(Exception ex){
        ex.printStackTrace();
        strEXMessage=ex.getMessage();
        return 2;
    }
} 

Access Code

SELECT tblExportCost.ProjDef, tblExportCost.Year,
Sum(IIf([Per]=1,[Val/ObjCur],0)) AS Jan, Sum(IIf([Per]=2,[Val/ObjCur],0)) AS Feb, Sum(IIf([Per]=3,[Val/ObjCur],0)) AS Mar,
Sum(IIf([Per]=4,[Val/ObjCur],0)) AS Apr, Sum(IIf([Per]=5,[Val/ObjCur],0)) AS May, Sum(IIf([Per]=6,[Val/ObjCur],0)) AS Jun,
Sum(IIf([Per]=7,[Val/ObjCur],0)) AS Jul, Sum(IIf([Per]=8,[Val/ObjCur],0)) AS Aug, Sum(IIf([Per]=9,[Val/ObjCur],0)) AS Sep,
Sum(IIf([Per]=10,[Val/ObjCur],0)) AS Oct, Sum(IIf([Per]=11,[Val/ObjCur],0)) AS Nov, Sum(IIf([Per]=12,[Val/ObjCur],0)) AS Dec
FROM tblExportCost
GROUP BY tblExportCost.ProjDef, tblExportCost.Year, tblExportCost.Year
HAVING (((tblExportCost.Year)= 2016) AND ((tblExportCost.ProjDef)= 'T34151234'))

I have even tried to save the Access query and simply use

strSQLString = "SELECT * FROM qryTestJava";

but this also returns the same incorrect results.

The Results

SQL

ProjDef     Year   Jan      Feb               Mar          Apr        May   
T34151234   2016  22358.1  18742.9  3443.33000000001    10251.03    12706.78    

Java

ProjDef     Year   Jan      Feb         Mar        Apr        May   
T34151234   2016  22,329  18,714       3,420      10,226    12,684

I did a bit of digging and found a similar problem with the rounding and ucanaccess Here , but it was reportedly fixed in an earlier version.

My current version of ucanaccess is 2.0.9.3

Answer 1

I was able to reproduce your issue under UCanAccess 3.0.5. The IIf() function appears to truncate double values to their integer value when invoked as

SELECT IIf([Per]=1,[Val/ObjCur],0) AS ...

while the entire double value is correctly returned when IIf() is called with 0.0 as the numeric literal value, ie,

SELECT IIf([Per]=1,[Val/ObjCur],0.0) AS ...

So you should be able to retrieve the correct SUMs by using

strSQLString = "SELECT tblExportCost.ProjDef, tblExportCost.Year,\n"
                        + "Sum(IIf([Per]=1,[Val/ObjCur],0.0)) AS Jan, Sum(IIf([Per]=2,[Val/ObjCur],0.0)) AS Feb, Sum(IIf([Per]=3,[Val/ObjCur],0.0)) AS Mar,\n"
                        + "Sum(IIf([Per]=4,[Val/ObjCur],0.0)) AS Apr, Sum(IIf([Per]=5,[Val/ObjCur],0.0)) AS May, Sum(IIf([Per]=6,[Val/ObjCur],0.0)) AS Jun,\n"
                        + "Sum(IIf([Per]=7,[Val/ObjCur],0.0)) AS Jul, Sum(IIf([Per]=8,[Val/ObjCur],0.0)) AS Aug, Sum(IIf([Per]=9,[Val/ObjCur],0.0)) AS Sep,\n"
                        + "Sum(IIf([Per]=10,[Val/ObjCur],0.0)) AS Oct, Sum(IIf([Per]=11,[Val/ObjCur],0.0)) AS Nov, Sum(IIf([Per]=12,[Val/ObjCur],0.0)) AS Dec\n" 
                        + "FROM tblExportCost\n" 
                        + "GROUP BY tblExportCost.ProjDef, tblExportCost.Year\n" 
                        + "HAVING (((tblExportCost.Year)= '" + strYear + "') AND ((tblExportCost.ProjDef)= 'T3415" + strNumber + "'))";