Question

我在Ubuntu 16.04下开发。我做了一个简单的QPainter调用

SEVERE: Servlet.service() for servlet [Jersey Web Application] in context 
with path [/restapi] threw exception [java.lang.IllegalStateException: 
Cannot connect the database!] with root cause
java.sql.SQLException: No suitable driver found for 
jdbc:mysql://localhost:3306/restapi?useUnicode=true&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC

但是valgrind给了我以下错误：

public class AuthService {
    private String url = "jdbc:mysql://localhost:3306/restapi?useUnicode=true&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC";
    public List<User> getAllUsers() {
        List<User> users = new ArrayList<User>();
        try (Connection conn = DriverManager.getConnection(url, "blabla", "blabla")) {

           Statement stmt = conn.createStatement();
           String sql;
           sql = "SELECT * FROM users";
           ResultSet rs = stmt.executeQuery(sql);
           while(rs.next()){

               int id  = rs.getInt("id");
               String login = rs.getString("login");
               String first = rs.getString("firstname");
               String last = rs.getString("lastname");

               users.add(new User(id, login, first, last));            
            }


       } catch (SQLException e) {
           throw new IllegalStateException("Cannot connect the database!", e);
       }
    return users;
}

这是什么原因？在QPainter电话中我做错了什么吗？或者这是一个与我自己的代码无关的Qt / Linux问题？

Qt QPainter使用未初始化的大小值

0 个答案: