java面向对象--------jdbc初学者教程

Posted 2023-02-09 砍死大大怪

连接数据库：

package com.sql;

import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import com.mysql.jdbc.Connection;

public class DbConnection 
        static final String DRIVERNAME="com.mysql.jdbc.Driver";
        static final String URL="jdbc:mysql://localhost:3306/testdb?useSSL=false";
        static final String USER="root";
        static final String PASSWORD="123456";
        static
            try
                Class.forName(DRIVERNAME);
    
         catch(ClassNotFoundException e)
                e.printStackTrace();
        
   
    
        public static Connection getCon
            Connection conn=null;
              try
                conn=(Connection)DriverManager.getConnection(URL,USER,PASSWORD);
    
         catch(SQLException e)
                e.printStackTrace();
        
         return conn;

        public static void close(ResultSet rs,java.sql.PreparedStstement ps,Connection conn)
           try
                if(rs!=null)
                    rs.close;

                if(ps!=null)
                    ps.close;

                if(conn!=null)
                    conn.close;

    
         catch(Exception e)
                e.printStackTrace();
        
public static void main(String[] args)
       Connection coon =getCon();
       System.out.println("连接的数据库为"+conn);

今天你学费了嘛，下次继续费费的哦