连接到 phpmyadmin 时出错

Posted 2023-02-25

【中文标题】连接到 phpmyadmin 时出错

【英文标题】：Error connecting to phpmyadmin

【发布时间】：2018-09-06 15:10:56

【问题描述】：

所以我正在使用 netbeans，我有基本代码可以在 phpmyadmin 中连接到我的数据库，但它给了我错误，我不知道为什么。

    public Connection getConnection()

    Connection con;
    try
        Class.forName("com.mysql.jdbc.Driver");
        con = DriverManager.getConnection("jdbc:mysql://localhost/test", "root", "");
        return con;
    catch(Exception e)
        e.printStackTrace();
        return null;
    

我确实在库中有 mysql-connector-java-5.1.46-bin 文件，但它仍然给我这个：

    java.sql.SQLException: No suitable driver found for 
jdbc:mysql//localhost/test
at java.sql.DriverManager.getConnection(DriverManager.java:689)
at java.sql.DriverManager.getConnection(DriverManager.java:247                                    
at bdaysms.Main.getConnection(Main.java:20)
at bdaysms.Main.getContactsList(Main.java:31)
at bdaysms.Main.Show_Users(Main.java:53)
at bdaysms.Main.<init>(Main.java:12)
at bdaysms.Main$4.run(Main.java:272)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
    java.lang.NullPointerException
at bdaysms.Main.getContactsList(Main.java:38)
at bdaysms.Main.Show_Users(Main.java:53)
at bdaysms.Main.<init>(Main.java:12)
at bdaysms.Main$4.run(Main.java:272)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

我的代码有问题还是我缺少要连接的东西？

【参考方案1】：

也提供端口

con = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "");

mysql默认端口3306

【讨论】：

我刚刚从 xampp 检查了我的端口，但即便如此，同样的问题也会发生。