java - com.mysql.jdbc.driver 类未找到异常

Question

我从 this 得到了帮助博文:

但我得到 com.mysql.jdbc.driver class not found 异常。该博客文章的不同之处在于，在我的案例中，他们尝试连接到 mysql 而不是 MS SQL。到目前为止，这是我的代码: 包 com.example.dbtry;

public class MainActivity extends Activity {
protected TextView tv;

private static final String url = "jdbc:jtds:sqlserver://Server.com:1433/DB_name";
private static final String user = "username";
private static final String pass = "password";



@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    testDB();
}

public void testDB() {
    tv = (TextView)findViewById(R.id.textView1);
     try {
            Class.forName("com.mysql.jdbc.Driver");
            Connection con = DriverManager.getConnection(url, user, pass);
            /* System.out.println("Database connection success"); */

            String result = "Database connection success\n";
          tv.setText(result);
            Statement st = con.createStatement();
            ResultSet rs = st.executeQuery("select * from this_table");
            ResultSetMetaData rsmd = rs.getMetaData();

            while(rs.next()) {
                result += rsmd.getColumnName(1) + ": " + rs.getInt(1) + "\n";
                result += rsmd.getColumnName(2) + ": " + rs.getString(2) + "\n";
                result += rsmd.getColumnName(3) + ": " + rs.getString(3) + "\n";
            }
            tv.setText(result);
        }
        catch(Exception e) {
            e.printStackTrace();
            tv.setText(e.toString());
        }   

    }


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

}

请告诉我我做错了什么。我还在 list 中添加了访问互联网的权限。

Answer 1

下载JTDS驱动程序并将其包含在您的 classpath 中。构建并运行您的代码。它会起作用。