无法连接到 Mariadb Xampp 数据库

Posted 2023-02-25

【中文标题】无法连接到 Mariadb Xampp 数据库

【英文标题】：Cannot connect to Mariadb Xampp-Database

【发布时间】：2020-04-21 09:49:55

【问题描述】：

我正在尝试通过 eclipse 和 tomcat 连接到本地 MariaDB 数据库。当我运行程序时，我收到以下消息：

java.sql.SQLNonTransientConnectionException: Could not connect to localhost:8080 : unexpected end of stream, read 0 bytes from 4 (socket was closed by server)
    at org.mariadb.jdbc.internal.util.exceptions.ExceptionMapper.get(ExceptionMapper.java:240)
    at org.mariadb.jdbc.internal.util.exceptions.ExceptionMapper.getException(ExceptionMapper.java:171)
    at org.mariadb.jdbc.internal.protocol.AbstractConnectProtocol.connectWithoutProxy(AbstractConnectProtocol.java:1132)
    at org.mariadb.jdbc.internal.util.Utils.retrieveProxy(Utils.java:561)
    at org.mariadb.jdbc.MariaDbConnection.newConnection(MariaDbConnection.java:175)
    at org.mariadb.jdbc.Driver.connect(Driver.java:92)

这是我正在执行的代码：

public void verbinde() 
        Connection conn = null;
          Statement stmt = null;
          try 
              //STEP 2: Register JDBC driver
              Class.forName("org.mariadb.jdbc.Driver");

              //STEP 3: Open a connection
              System.out.println("Connecting to a selected database...");
              conn = DriverManager.getConnection(
                      "jdbc:mariadb://localhost:8080/test?user=root&password=root");
              System.out.println("Connected database successfully...");

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

              String sql = "CREATE TABLE REGISTRATION "
                      + "(id INTEGER not NULL, "
                      + " first VARCHAR(255), "
                      + " last VARCHAR(255), "
                      + " age INTEGER, "
                      + " PRIMARY KEY ( id ))";

              stmt.executeUpdate(sql);
              System.out.println("Created table in given database...");
           catch (SQLException se) 
              //Handle errors for JDBC
              se.printStackTrace();
           catch (Exception e) 
              //Handle errors for Class.forName
              e.printStackTrace();
           finally 
              //finally block used to close resources
              try 
                  if (stmt != null) 
                      conn.close();
                  
               catch (SQLException se) 
              // do nothing
              try 
                  if (conn != null) 
                      conn.close();
                  
               catch (SQLException se) 
                  se.printStackTrace();
              //end finally try
          //end try
          System.out.println("Goodbye!");
      //end main
    //end JDBCExample

【参考方案1】：

MariaDB 的默认端口是 3306 而不是 8080

jdbc:mariadb://localhost:3306/test?user=root&password=root

8080 是你的 tomcat 运行的端口

顺便说一句：使用 try-with-resources 而不是 try-catch-finally 块

【讨论】：

嘿，仍然没有连接。这是 phpmyadmin localhost:8080/phpmyadmin/db_structure.php?server=1&db=test 的 URL。

尝试使用 3306 但也没有连接。

Tomcat 的 HTTP/1.1 端口应该是什么？