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先生/ MAM 這是我的代碼成功運行，但不能插入服務器內的任何值Java連接問題到mysql
輸出： -
successfully inserted 11111111
drver loaded successfully
created the connection from the database
successfully inserted
代碼： -
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package examples;
import java.sql.*;
/**
*
* @author Rahul_R_
*/
public class newfile {
Connection conn=null;
public newfile() {
//inside no paramerter constructor create inside it to define username,password,url
String username="root";
String password="root";
String url="jdbc:mysql://localhost:3306/login_page";
try{
Class.forName("com.mysql.jdbc.Driver");
System.out.println("drver loaded successfully");
//create the connection form the database
conn=DriverManager.getConnection(url,username,password);
System.out.println("created the connection from the database");
}catch(ClassNotFoundException ce){
ce.printStackTrace();
System.out.println("class not found driver error");
//any sql error in database connection from sql sides than this exceptions
}catch(SQLException q){
q.printStackTrace();
System.out.println("sql exception in the program or jdbc connectivity");
}
}
public void create(Beans_login b){
//creat the statement to insert something in to the database system
try{
//create query written here
String query="insert into login_info(id,username,password)"+"values(?,?,?)";
//create the preparestatment and run the query on the tables
PreparedStatement psmt=conn.prepareStatement(query);
//according to ur database table insert to written statement
psmt.setInt(1, b.getId());
psmt.setString(2, b.getUsername());
psmt.setString(3, b.getPassword());
}catch(SQLException e){
//any sql error to show inside it
e.printStackTrace();
System.out.println("inside it any username or table name different than error");
}
}
//檢查連接是否正常工作
public static void main(String[] args) {
//to insert the values
Beans_login b=new Beans_login(4, "ggg", "ggg");
System.out.println("successfully inserted 11111111");
//create daos objects
newfile f=new newfile();
f.create(b);
System.out.println("successfully inserted");
}
}
請給我一個解決方案