Question

I have below class file. If I try to insert values from Vector to database, then it will display below error. I want to use Vector in this case and looking how to resolve this issue.

error : The method setString(int, String) in the type PreparedStatement is not applicable for the arguments (int, Object) 

below is the class code:

public class ReadExcelFile {

        public static void main(String[] args) {

                String fileName = "C:\\excelFile.xls";
                Vector dataHolder = ReadCSV(fileName);
                printCellDataToConsole(dataHolder);
        }

        public static Vector ReadCSV(String fileName) {
                Vector cellVectorHolder = new Vector();

                try {
                        FileInputStream myInput = new FileInputStream(fileName);

                        POIFSFileSystem myFileSystem = new POIFSFileSystem(myInput);

                        HSSFWorkbook myWorkBook = new HSSFWorkbook(myFileSystem);

                        HSSFSheet mySheet = myWorkBook.getSheetAt(0);

                        Iterator rowIter = mySheet.rowIterator();

                        while (rowIter.hasNext()) {
                                HSSFRow myRow = (HSSFRow) rowIter.next();
                                Iterator cellIter = myRow.cellIterator();
                                Vector cellStoreVector = new Vector();
                                while (cellIter.hasNext()) {
                                        HSSFCell myCell = (HSSFCell) cellIter.next();
                                        cellStoreVector.addElement(myCell);
                                }
                                cellVectorHolder.addElement(cellStoreVector);
                        }
                } catch (Exception e) {
                        e.printStackTrace();
                }
                return cellVectorHolder;
        }

        public static void printCellDataToConsole(Vector dataHolder) {

                for (int i = 0; i < dataHolder.size(); i++) {
                        Vector cellStoreVector = (Vector) dataHolder.elementAt(i);
                     //   System.out.println(cellStoreVector);
                        for (int j = 0; j < cellStoreVector.size(); j++) {
                              HSSFCell myCell = (HSSFCell) cellStoreVector.elementAt(j);
                              String stringCellValue = myCell.toString();
                              System.out.print(stringCellValue + "\t\t");
                        }
                        System.out.println();
                }
        }


}

//below is the database query

String sql = "INSERT INTO table_name(EMP_ID,FNAME, LNAME, CATEGORY, DEPARTMENT, Title, REASON, Manager, sDate, eDate, ID) VALUES(?,?,?,?,?,?,?,?,?,?,?)";
PreparedStatement pst1 = conn.prepareStatement(sql);
pst1.setString(1, cellStoreVector.get(0));
pst1.setString(2, cellStoreVector.get(1));
pst1.setString(3, cellStoreVector.get(2));
pst1.setString(4, cellStoreVector.get(3));
pst1.setString(5, cellStoreVector.get(4));
pst1.setString(6, cellStoreVector.get(5));
pst1.setString(7, cellStoreVector.get(6));
pst1.setString(8, cellStoreVector.get(7));
pst1.setString(9, cellStoreVector.get(8));
pst1.setString(10, cellStoreVector.get(9));
pst1.setString(11, "555");  //Hardcoded for testing. 
pst1.execute();

Answer 1

Your Vector is defined to hold Objects.

The Vector#get will return an Object.

The PreparedStatement#setString method is expecting a String, this is a simple type mismatch issue.

You can declare you Vector so that it only contains String…

Vector<String> myVector = new Vector<String>(25);

…But I don’t think you can from your example…

You can cast the value in the Vector to a String

pst1.setString(1, (String)cellStoreVector.get(0));

But this is dangerous as you won’t find out that the Vector doesn’t contain a String element until run-time

Or you can let the PreparedStatement handle it…

pst1.setObject(1, cellStoreVector.get(0));