Question

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，我的数据库中有一个表有一些IIF和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;
    }
}

访问代码

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，只需使用

strSQLString = "SELECT * FROM qryTestJava";

但这也会返回相同的错误结果。

结果

SQL

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

爪哇

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

我做了一些挖掘并发现了与舍入和ucanaccess Here类似的问题，但据报道它已在早期版本中修复。

我当前的ucanaccess版本是2.0.9.3

Answer 1

我能够在UCanAccess 3.0.5下重现您的问题。 module.exports = function replace(grunt) { var randomVersion = ((new Date()).valueOf().toString()) + (Math.floor((Math.random() * 1000000) + 1).toString()); var replace = { options: { variables: { 'randomVersion': randomVersion }, overwrite: true }, files: [{ src: './target/dist/index.html', dest: './target/dist/index.' + randomVersion + '.html' }] }; console.log(randomVersion); grunt.config.set('replace', replace); };函数似乎在调用为

时将双值截断为其整数值

IIf()

虽然在使用SELECT IIf([Per]=1,[Val/ObjCur],0) AS ...作为数字文字值调用IIf()时正确返回整个double值，即

0.0

因此，您应该能够使用

检索正确的SUM

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

运行相同查询时，Java从SQL返回不同的结果

1 个答案: