Java在运行相同查询时从SQL返回不同的结果

我有一个用Java编写的SQL语句（netbeans/uncanaccess），这是一个相当简单的select语句，其中包含几个IIF和来自数据库中一个表的SUM

当我在Access中运行SQL语句时，它会返回正确的结果，但是当我尝试在Java中运行它时，它会返回相似但不完全相同的结果

Java代码

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;
    }
} 

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'))

访问代码

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;
    }
} 

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'))

我甚至尝试保存Access查询并简单地使用

strSQLString = "SELECT * FROM qryTestJava";

但这也会返回同样不正确的结果

结果

SQL

爪哇

我做了一点挖掘，发现了类似的取整和ucanaccess问题，但据报道在早期版本中已经修复

---

我目前的ucanaccess版本是2.0.9.3

我可以在ucanaccess 3.0.5下复制您的问题。

IIf（）

选择IIf（[Per]=1[Val/ObjCur]，0）作为。。。

当使用
0.0
作为数值文本值调用
IIf（）
时，正确返回整个双精度值，即

选择IIf（[Per]=1[Val/ObjCur]，0.0）作为。。。

因此，您应该能够通过使用

strSQLString=“选择tblExportCost.ProjDef，tblExportCost.Year\n”
+“金额（IIf（[Per]=1，[Val/ObjCur]，0.0]）为一月，金额（IIf（[Per]=2，[Val/ObjCur]，0.0]）为二月，金额（IIf（[Per]=3，[Val/ObjCur]，0.0]）为三月，\n”
+“总和（IIf（[Per]=4，[Val/ObjCur]，0.0]）为四月，总和（IIf（[Per]=5，[Val/ObjCur]，0.0]）为五月，总和（IIf（[Per]=6，[Val/ObjCur]，0.0]）为六月，\n”
+“金额（IIf（[Per]=7，[Val/ObjCur]，0.0]）为7月，金额（IIf（[Per]=8，[Val/ObjCur]，0.0]）为8月，金额（IIf（[Per]=9，[Val/ObjCur]，0.0]）为9月，\n”
+“总和（IIf（[Per]=10，[Val/ObjCur]，0.0]）作为十月，总和（IIf（[Per]=11，[Val/ObjCur]，0.0]）作为十一月，总和（IIf（[Per]=12，[Val/ObjCur]，0.0]）作为十二月\n”
+“来自tblExportCost\n”
+按tblExportCost.ProjDef、tblExportCost.Year分组\n
+“具有（（（tblExportCost.Year）='“+strYear+”）和（（tblExportCost.ProjDef）='T3415”+strNumber+”）”；
您可以尝试改用最新版本的UCanAccess（目前为3.0.5）吗？而且，
3443.3300000001
看起来像一个浮点值。是否可以使用Access在设计视图中打开[tblExportCost]，并确认[Val]和[ObjCur]的列类型？（单？双？货币？…）可能需要用WHERE条款替换HAVING？通常，当您使用它来限制函数时，SQL会试图限制某些字段。另外，不需要在同一字段上分组两次。@jamadei正确。我相信在代码中用[]包围列名可以确保没有其他符号与计算混淆？（无论如何，我认为这是正确的）“我相信在代码中用[]包围列名可以确保没有其他符号与计算混淆？”-是的，没错。很抱歉没有注意到这一点。效果很好，非常感谢您的回答和清晰的解释！