Java-Methode zur Erkennung einer erfolgreichen Verbindung zur MySQL-Datenbank

package com.test.tool;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class JDBCUtlTool {
  public static Connection getConnection(){
    String driver="com.mysql.jdbc.Driver";  //获取mysql数据库的驱动类
    String url="jdbc:mysql://localhost:3306/test"; //连接数据库（kucun是数据库名）
    String name="root";//连接mysql的用户名
    String pwd="123456";//连接mysql的密码
    try{
      Class.forName(driver);
      Connection conn=DriverManager.getConnection(url,name,pwd);//获取连接对象
      return conn;
    }catch(ClassNotFoundException e){
      e.printStackTrace();
      return null;
    }catch(SQLException e){
      e.printStackTrace();
      return null;
    }
  }
  public static void closeAll(Connection conn,PreparedStatement ps,ResultSet rs){
    try{
      if(rs!=null){
        rs.close();
      }
    }catch(SQLException e){
      e.printStackTrace();
    }
    try{
      if(ps!=null){
        ps.close();
      }
    }catch(SQLException e){
      e.printStackTrace();
    }
    try{
      if(conn!=null){
        conn.close();
      }
    }catch(SQLException e){
      e.printStackTrace();
    }
  }
  public static void main(String[] args) throws SQLException
  {
    Connection cc=JDBCUtlTool.getConnection();
    if(!cc.isClosed())
    System.out.println("Succeeded connecting to the Database!");
    Statement statement = cc.createStatement();
    String sql = "select * from test2";
    ResultSet rs = statement.executeQuery(sql);
    while(rs.next()) {
      System.out.println(rs.getString("id")+"");
    }
  }
}