Question

我现在已经尝试了几个小时，但没有成功。我下载了JDBC驱动程序，它显示它是我在Eclipse的Package Explorer下引用的库之一，但每次我尝试运行我的代码时都会出错。我的数据库很好，因为我可以更改它并从MySQL命令行客户端查看它。

我实际上按照指南说明如何操作，只是将数据库中的信息替换为我的信息。

import java.sql.*;

public class FirstExample {

//JDBC Driver Name and Database URL
final static String JDBC_DRIVER = "com.mysql.jdbc.Driver";  
final static String DB_URL = "jdbc:mysql://localhost/test_database";

//Database Credentials
static final String USER = "user_one";
static final String PASS = "User_one_password";

public static void main(String[] args) {

    Connection conn = null;
    Statement stmt = null;

    try {
        //Register JDBC Driver
        Class.forName("com.mysql.jdbc.Driver");

        //Open a Connection
        System.out.println("Connecting to the Database...");
        conn = DriverManager.getConnection(DB_URL, USER, PASS);

        //Execute a Query
        System.out.println("Creating Statement...");
        stmt = conn.createStatement();
        String sql;
        sql = "SELECT * FROM user";
        ResultSet rs = stmt.executeQuery(sql);

        //Extract Data from Result Set
        while (rs.next()) {
            //Retrieve by Column Name
            int id = rs.getInt("id");
            String first = rs.getString("name");

            //Display Values
            System.out.print("ID: " + id);
            System.out.println("Name: " + first);
        }
        //Clean Up Environment
        rs.close();
        stmt.close();
        conn.close();
    } 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)
                stmt.close();
        } catch (SQLException se2) {
            //Nothing We Can Do
        }
        try {
            if (conn != null)
                conn.close();
        } catch (Exception se) {
            se.printStackTrace();
        }//End Finally Try
    }//End Try
    System.out.println("Goodbye!");
}//End Main

}//End First Example

这是我得到的错误http://pastebin.com/hLSxV3aq

尝试连接Eclipse ee中的数据库

0 个答案: