欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页

How do I read and insert BLOBs data from database?

程序员文章站 2024-03-04 12:08:35
...

Only for reference.

 

import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.sql.*;

public class TestOperBlob {
    private static String url = "jdbc:oracle:thin:@localhost:1521:orcl";
    private static String username = "test";
    private static String password = "test";
    
    public void queryBlob(){
      try{
          conn = getConnection();
          conn.setAutoCommit(false);

          String sql = "INSERT INTO pictures (name, description, image) VALUES (?, ?, ?)";
          PreparedStatement stmt = conn.prepareStatement(sql);
          stmt.setString(1, "java.gif");
          stmt.setString(2, "Java Official Logo");

          File image = new File("D:\\Projects\\kodejava\\web\\images\\java.gif");
          fis = new FileInputStream(image);
          stmt.setBinaryStream(3, fis, (int) image.length());
          stmt.execute();

          conn.commit();
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            closeConnection(conn);
        }
    }

    public void insertBlob(){
      Connection conn = null;
      try {
            conn = getConnection();

            String sql = "SELECT name, description, image FROM pictures ";
            PreparedStatement stmt = conn.prepareStatement(sql);
            ResultSet resultSet = stmt.executeQuery();
            while (resultSet.next()) {
                String name = resultSet.getString(1);
                System.out.println("Name        = " + name);
                String description = resultSet.getString(2);
                System.out.println("Description = " + description);

                File image = new File("D:\\java.gif");
                FileOutputStream fos = new FileOutputStream(image);

                byte[] buffer = new byte[256];
                // Get the binary stream of our BLOB data
                InputStream is = resultSet.getBinaryStream(3);
                while (is.read(buffer) > 0) {
                    fos.write(buffer);
                }

                fos.close();
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            if (fis != null) {
                fis.close();
            }
            closeConnection(conn);
        }
    }
    
    private static Connection getConnection() throws Exception {    
        Connection connection = null;    
        Class.forName("com.mysql.jdbc.Driver");    
        connection = DriverManager.getConnection(url, username, password);
        return connection;    
    }    
        
    private static void closeConnection(Connection connection) throws SQLException {    
        if (connection != null && !connection.isClosed()) {             
            connection.close();    
        }    
    }
    
    public static void main(String[] args) throws Exception {
        queryBlob();
        insertBlob();
    }
}

 

上一篇: java计算开方

下一篇: