在 MySQL 数据库上存储歌曲（BLOb 支持）

Question

我正在尝试在 MySQl db 上存储歌曲和歌词。我搜索了如何执行此操作的示例，但没有帮助。但是，我能够存储图像：

  con = DriverManager.getConnection(connectionURL, "root", "");
PreparedStatement ps = con.prepareStatement("INSERT INTO image VALUES(?,?)");
 File file = new File("E://guitar.gif");
FileInputStream fs = new FileInputStream(file);
ps.setInt(1,id);
ps.setBinaryStream(2,fs,fs.available());
int i = ps.executeUpdate();
ps.close();
con.close();
//rest code

谁能帮我如何存储歌曲？例如？以及如何找回它？

Answer 1

存储歌曲与存储图像没有什么不同。您可以为文件名添加另一列，并且您可以执行类似的操作来存储文件：

//..
PreparedStatement ps = con.prepareStatement("INSERT INTO data_table VALUES(?, ?, ?)");
//...
ps.setInt(1,id);
ps.setString(2, file.getName());
ps.setBinaryStream(3, fs,fs.available());
int i = ps.executeUpdate();
//...

然后检索它：

PreparedStatement ps = con.prepareStatement("SELECT file_name, content from data_table where *some condition*");
ResultSet rs = ps.executeQuery();
while(rs.hasNext) {
    rs.next();
    String fileName = rs.getString("file_name");
    Blob blob = rs.getBlob("content");
    byte[] content = blob.getBytes(1, (int) blob.length());
    //now content contains the data, you ca store it in a file if you need
    OutputStream os = new FileOutputStream(new File("d:/test/" + fileName));
    os.write(content);
    os.close();
}

不要忘记异常处理！

编辑：另一个带有字节数组的版本： 写：

//..
PreparedStatement ps = con.prepareStatement("INSERT INTO data_table VALUES(?, ?, ?)");
//...
byte[] content = new byte[fs.available()];
ps.setInt(1,id);
ps.setString(2, file.getName());
ps.setBytes(3, content);
int i = ps.executeUpdate();
//...

阅读：

PreparedStatement ps = con.prepareStatement("SELECT file_name, content from data_table where *some condition*");
ResultSet rs = ps.executeQuery();
while(rs.hasNext) {
    rs.next();
    String fileName = rs.getString("file_name");
    byte[] content = rs.getBytes("content");
    //now content contains the data, you ca store it in a file if you need
    OutputStream os = new FileOutputStream(new File("d:/test/" + fileName));
    os.write(content);
    os.close();
}