package com.play;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.sql.Blob;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
public class DatabaseToFile {
public static void main(String[] args) throws Exception {
Class.forName("com.mysql.jdbc.Driver");
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/test","root","root");
String sql = "select * from t_user where name=?";
PreparedStatement ps = con.prepareStatement(sql);
ps.setString(1, "wangba");
ResultSet rs = ps.executeQuery();
while(rs.next()){
Blob blob = rs.getBlob("image");
OutputStream os = new FileOutputStream("D:\\a.jpg");
os.write(blob.getBytes(1, (int)blob.length()));
os.flush();
os.close();
}
rs.close();
ps.close();
con.close();
}
}