Netbeans 与 mysql 的交流

Question

我已经为我们公司创建了一个应用程序。起初，我尝试在 MySQL-xampp 中的数据库中创建无密码的方法，但效果很好。现在我的问题是我在我的数据库上设置了密码，现在我的应用程序在我登录时抛出这个错误：

SQL java.sql.SQLException: Access denied for user 'root'@'CITSP-MOB7'(using password: YES)

我在连接数据库时也遇到错误：

Unable to connect. Cannot establish a connection to jdbc:mysql//localhost:3306/mydb using com.mysql.jdbc.Driver (Access denied for user 'root'@'CITSP-MOB7' (using password: YES)).

这是我的数据库连接代码：

static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";
static final String DB_URL = "jdbc:mysql://192.168.1.112:3306/citsp";
static final String USER = "root";
static final String PASS = "mypassword";

try{
   Class.forName("com.mysql.jdbc.Driver");
  }catch(ClassNotFoundException ex){
            }
  //STEP 3: Open a connection
  System.out.println("Connecting to database...");
  conn = DriverManager.getConnection(DB_URL,USER,PASS);

  //STEP 4: Execute a query
  System.out.println("Creating statement...");
  stmt = conn.createStatement();

有人可以帮我解决连接问题吗？您的回答将不胜感激。提前致谢！ :)

Answer 1

如果适合您，请在 mysql 中测试创建新用户。

首先在mysql中创建一个新用户：以 root 身份从 mysql 命令行登录。然后运行下面一条一条的命令。

MySQL

创建用户 'mydbuser'@'localhost' 由 'asdf';
将 . 上的所有权限授予 'mydbuser'@'localhost' ;
刷新权限；

将上面的 java 代码更改为以下内容：我假设你的数据库名称是 'citsp'

JAVA

        String JDBC_DRIVER = "com.mysql.jdbc.Driver";
        String DB_URL = "jdbc:mysql://localhost/citsp";
        String USER = "mydbuser";
        String PASS = "asdf";

        try {
            Class.forName("com.mysql.jdbc.Driver");
        } catch (ClassNotFoundException ex) {
            //JOptionPane.showMessageDialog(null, "There's an error connecting with the database. Please contact your administrator.");
        }
        //STEP 3: Open a connection
        System.out.println("Connecting to database...");
        java.sql.Connection conn = null;
        try {
            conn = DriverManager.getConnection(DB_URL, USER, PASS);
        } catch (SQLException ex) {
            Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
            ex.printStackTrace();
        }

        //STEP 4: Execute a query
        System.out.println("Creating statement...");
        try {
            Statement stmt = conn.createStatement();
            String query = "";
            ResultSet rs = stmt.executeQuery(query);
            while(rs.next()){
                // Iterate through the result
            }
        } catch (SQLException ex) {
            Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
        }

Netbeans 与 mysql 的交流

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