如何在java中动态地使用excel中第一行的内容在mysql中创建表

Question

How to create table in MySQL with the contents of first row in excel in java dynamically without hard-coding and creating and I have a excel in which columns are added or deleted frequently... so I need to update my table frequently with new columns.. anyone please help. I am using spring-jdbc to connect to database and creating maven project... and how to read a cell value with date in it with format MM/DD/YYYY? for reading excel data I am using Apache-poi..

I want table in mysql like

ID  Employee Manager   Onsite  4/15/2015    4/16/2015  4/17/2015

How do I create? Please refer the below excel..the major thing is after two day again another date column will be added to my excel..that also I need to save in table previously that I have created..I am not getting idea how it can be done... I can't create the table as I have created in my code...

My excel is like this.. and having more than 100 rows

ID        Employee    Manager    Onsite        4/15/2015   4/16/2015  4/17/2015
1           raju        ram      offshore        8            8          8

My code

package controller;


import java.io.File;
import java.io.FileInputStream;
import java.util.ArrayList;
import java.util.Iterator;

import javax.sql.DataSource;

import model.PMOEmployee;





import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.springframework.jdbc.core.JdbcTemplate;






    public class ExcelDBJDBCDAO implements ExcelDBDAO {

        private DataSource dataSource;

        private  JdbcTemplate jdbcTemplate;

        public DataSource getDataSource() {
            return dataSource;
        }

        public void setdataSource(DataSource dataSource) {
            this.dataSource = dataSource;
        }

        public JdbcTemplate getjdbcTemplate() {
            return jdbcTemplate;
        }

        public void setjdbcTemplate(JdbcTemplate jdbcTemplate) {
            this.jdbcTemplate = jdbcTemplate;
        }

        public void importdata() {
             TODO Auto-generated method stub
             table creation
            String sql="create table PMO(Id int ,Employee varchar(50),Manager varchar(50),Onsite varchar(50))";
            getjdbcTemplate().update(sql);        
    System.out.println("table created Successfully :)");


            ArrayList<PMOEmployee> list = new ArrayList<PMOEmployee>();

            try
            {
                FileInputStream file = new FileInputStream(new File("/home/svenkatakishore/Untitled 1.xls"));

                //Create Workbook instance holding reference to .xlsx file
                HSSFWorkbook workbook = new HSSFWorkbook(file);

                //Get first/desired sheet from the workbook
                HSSFSheet sheet = workbook.getSheetAt(0);

                //Iterate through each rows one by one
                Iterator<Row> rowIterator = sheet.iterator();

                while (rowIterator.hasNext())
                {
                    Row row = rowIterator.next();
                    PMOEmployee employee = new PMOEmployee();
                    //For each row, iterate through all the columns

                    Iterator<Cell> cellIterator = row.cellIterator();                 
                    while (cellIterator.hasNext())
                    {

                        Cell cell = cellIterator.next();
                        //Check the cell type and format accordingly
                        switch (cell.getCellType())
                        {
                        case Cell.CELL_TYPE_NUMERIC:
                            if (cell.getColumnIndex() == 0) {
                                employee.setId((int)cell.getNumericCellValue());
                            } 

                            break;
                            case Cell.CELL_TYPE_STRING:
                                if (cell.getColumnIndex() == 1) {
                                    employee.setEmployeeName(cell.getStringCellValue());
                                }
                                else if (cell.getColumnIndex() == 2) {
                                    employee.setManager(cell.getStringCellValue());
                                }
                                else if (cell.getColumnIndex() == 3) {
                                    employee.setOnsite(cell.getStringCellValue());
                                }


                                break;


                        }
                    }
                    String sql1 = "INSERT INTO PMO(Id,Employee,Manager,Onsite) VALUES(?, ?, ?, ?)";
                    getjdbcTemplate().update(sql1, new Object[]{employee.getId(),employee.getEmployeeName(),
                            employee.getManager(),employee.getOnsite()});

                }
                file.close();
            }
            catch (Exception e)
            {
                e.printStackTrace();
            }    

            }



        }

myoutput

 ID     Employee       Manager   Onsite  
 1      raju           ram       offsore     

Answer 1

It is happening because the spreadsheet returns the date cell value as integer. You need to check if your cell contains date, and work accordingly. This can be done by using DateUtil class. For eg

HSSFWorkbook workbook = new HSSFWorkbook(file);

        //Get first/desired sheet from the workbook
        HSSFSheet sheet = workbook.ge`enter code here`tSheetAt(0);

        //Iterate through each rows one by one
        Iterator<Row> rowIterator = sheet.iterator();
        while (rowIterator.hasNext())
        {
            Row row = rowIterator.next();
            //For each row, iterate through all the columns
            Iterator<Cell> cellIterator = row.cellIterator();

            while (cellIterator.hasNext())
            {

                Cell cell = cellIterator.next();
                //Check the cell type and format accordingly
                switch (cell.getCellType())
                {
                case Cell.CELL_TYPE_NUMERIC:
                        if (DateUtil.isCellDateFormatted(cell)) {
                    System.out.println(cell.getDateCellValue() + "\t\t\t\t");
                } else {
                    System.out.println(cell.getNumericCellValue() + "\t\t\t\t");
                }
                break;
                    case Cell.CELL_TYPE_STRING:
                        System.out.print(cell.getStringCellValue() + "\t\t\t\t");
                        break;
//                       case Cell.CELL_TYPE_BLANK:
//                           System.out.println("0"+ "\t\t");
//                           break;

                }
            }
            System.out.println("");
        }
        file.close();
    }
    catch (Exception e)
    {
        e.printStackTrace();
    }    

    }