Javaexamples-insert-data-from-database-to-spreadsheet

データベースからスプレッドシートへのデータの挿入

問題の説明

Javaを使用してデータベースからスプレッドシートにデータを挿入する方法。

溶液

以下は、Javaを使用してデータベースからスプレッドシートにデータを挿入するプログラムです。

import java.io.File;
import java.io.FileOutputStream;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class InsertDataFromDataBaseToSpreadSheet {
   public static void main(String[] args) throws Exception {

     //Connecting to the database
      Class.forName("com.mysql.jdbc.Driver");
      Connection connect = DriverManager.getConnection(
         "jdbc:mysql://localhost:3306/details", "root" , "password");

     //Getting data from the table emp_tbl
      Statement statement = connect.createStatement();
      ResultSet resultSet = statement.executeQuery("select *from student_data");

     //Creating a Work Book
      XSSFWorkbook workbook = new XSSFWorkbook();

     //Creating a Spread Sheet
      XSSFSheet spreadsheet = workbook.createSheet("employe db");
      XSSFRow row = spreadsheet.createRow(1);
      XSSFCell cell;

      cell = row.createCell(1);
      cell.setCellValue("EMP ID");

      cell = row.createCell(2);
      cell.setCellValue("EMP NAME");

      cell = row.createCell(3);
      cell.setCellValue("DEG");

      cell = row.createCell(4);
      cell.setCellValue("SALARY");

      cell = row.createCell(5);
      cell.setCellValue("DEPT");
      int i = 2;

      while(resultSet.next()) {
         row = spreadsheet.createRow(i);
         cell = row.createCell(1);
         cell.setCellValue(resultSet.getInt("ID"));

         cell = row.createCell(2);
         cell.setCellValue(resultSet.getString("NAME"));

         cell = row.createCell(3);
         cell.setCellValue(resultSet.getString("BRANCH"));

         cell = row.createCell(4);
         cell.setCellValue(resultSet.getString("PERCENTAGE"));

         cell = row.createCell(5);
         cell.setCellValue(resultSet.getString("EMAIL"));
         i++;
      }

      FileOutputStream out = new FileOutputStream(
         new File("C:/poiexcel/exceldatabase.xlsx"));

      workbook.write(out);
      out.close();

      System.out.println("exceldatabase.xlsx written successfully");
   }
}

データベース

mysql> select* from student_data;
+----+--------+--------+------------+---------------------+
| ID | NAME   | BRANCH | PERCENTAGE | EMAIL               |
+----+--------+--------+------------+---------------------+
|  1 | Ram    | IT     |         85 | [email protected]    |
|  2 | Rahim  | EEE    |         95 | [email protected]  |
|  3 | Robert | ECE    |         90 | [email protected] |
+----+--------+--------+------------+---------------------+
3 rows in set (0.00 sec)

結果

データベース