Question

我想将上传的文件（如照片，视频，PDF，Excel ....）存储在数据库中。当我上传文件时，应该存储的数据是文件路径，类型和时间戳。我的数据库列是id，file，type，timestamp。

Answer 1

我想你问如何使用vanilla java（no hibernate）将信息插入MySQL数据库。

Vanilla Java示例（alvinalexander.com）：

import java.sql.*;
import java.util.Calendar;

/**
 * A Java MySQL PreparedStatement INSERT example.
 * Demonstrates the use of a SQL INSERT statement against a
 * MySQL database, called from a Java program, using a
 * Java PreparedStatement.
 * 
 * Created by Alvin Alexander, http://alvinalexander.com
 */
public class JavaMysqlPreparedStatementInsertExample
{

  public static void main(String[] args)
  {
    insertDataBase("uploads/demo","pdf");
  }


  public static insertDataBase(String filePath,String extension) {

   try
    {
      // create a mysql database connection
      String myDriver = "com.mysql.jdbc.Driver";
      String myUrl = "jdbc:mysql://localhost/test";
      Class.forName(myDriver);
      Connection conn = DriverManager.getConnection(myUrl, "root", "");

      // create a sql date object so we can use it in our INSERT statement
      Calendar calendar = Calendar.getInstance();
      java.sql.Date timeStamp = new java.sql.Date(calendar.getTime().getTime());

      // the mysql insert statement
      String query = " insert into upload (file, type, timestamp)"
        + " values (?, ?, ?)";

      // create the mysql insert preparedstatement
      PreparedStatement preparedStmt = conn.prepareStatement(query);
      preparedStmt.setString (1, filePath);
      preparedStmt.setString (2, extension);
      preparedStmt.setDate   (3, timeStamp);

      // execute the preparedstatement
      preparedStmt.execute();

      conn.close();
    }
    catch (Exception e)
    {
      System.err.println("Got an exception!");
      System.err.println(e.getMessage());
    }


  }
}

在运行代码之前，您需要使用maven或download将mysql驱动程序添加到类路径中。希望它能帮到你！

如何在数据库中存储带有时间戳的文件路径和类型？

2 个答案: