Question

我正在尝试测试与我的数据库的连接，但我一直收到以下错误

java.sql.SQLException: Access denied for user 'db'@'localhost' (using password: YES)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2975)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:798)
at com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:3700)
at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1203)
at com.mysql.jdbc.Connection.createNewIO(Connection.java:2572)
at com.mysql.jdbc.Connection.<init>(Connection.java:1485)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at ConnectingToDB.main(ConnectingToDB.java:18)

我的代码如下。该行发生错误 “conn = DriverManager.getConnection（url + dbName，userName，password）;”

public class ConnectingToDB
{
  public static void main(String[] args) 
  {
    System.out.println("MySQL Connect Example.");
    Connection conn = null;
    String url = "jdbc:mysql://localhost:3306/";
    String dbName = "steven";
    String driver = "com.mysql.jdbc.Driver";
    String userName = "db"; 
    String password = "db";
    try 
    {
      Class.forName(driver).newInstance();
      conn = DriverManager.getConnection(url+dbName,userName,password);
      System.out.println("Connected to the database");
      conn.close();
      System.out.println("Disconnected from database");
    } 
    catch (Exception e) {
    e.printStackTrace();
   }
 }

}

Answer 1

正如您所看到的，您的凭据由MySql处理但是被拒绝，这意味着该问题可能与凭证没有直接关系，因为如果凭据错误，则错误会有所不同然后被拒绝。凭据被拒绝时，问题主要与：

有关

权限问题 - 解决方案＆gt;＆gt;授予从“Localhost”
您的连接字符串看起来很好，但有时字符串编码会导致此错误
某些已安装的组件正在干扰MySql - ＆gt;检查组件安装

逐一尝试对上述步骤进行排查..

Answer 2

你应该检查你的mysql中是否存在 db @ localhost 。否则，请使用必要的权限创建此用户配置文件。

CREATE USER user_specification
    [, user_specification] ...

user_specification:
    user [IDENTIFIED BY [PASSWORD] 'password']

有关详情，请查看CREATE USER Syntax

Answer 3

LOCALHOST和“机器名称”与MySQL不同。我从命令行检查你可以连接到localhost：

mysql -hlocalhost -udb -pdb steven

如果失败，请使用适当的权限连接并运行它：

create user db@localhost identified by 'db';
grant select on steven.* to db@localhost;

无法连接到MySql数据库

3 个答案: