从Java更新sqlite数据库

我正在尝试从javafx更新sqlite数据库。为了更新数据库，我对数据库执行以下查询：

try 
  {
  int saveSpeed = gui.saveSpeedInt - gui.saveSpeedTimer;
  String query2;
  if(gui.textAnswerQ.equals(gui.saveAnswer.getText()) || gui.textAnswerToFQ.equals(gui.saveAnswer.getText()) || gui.SanswerTextField.getText().equals(gui.saveAnswer.getText())){

    String answer = "1";
    query2 = "update StudentsQuestions set Time = '"+saveSpeed+"' set Answer = '"+answer+"' where UserName = '"+gui.saveUser.getText()+"' and Question = '"+gui.question.getText()+"'";                 
  }
  else{
    String answer = "0";
    query2 = "update StudentsQuestions set Time = '"+saveSpeed+"' set Answer = '"+answer+"' where UserName = '"+gui.saveUser.getText()+"' and Question = '"+gui.question.getText()+"'";
  }

  PreparedStatement pst2 = gui.connectionUsers.prepareStatement(query2);
  pst2.execute();
  pst2.close();
 }

当我一直执行更新时，答案字段似乎是空的。我做错什么了吗？Aswer是StudentQuestions表中的一个字段，类型为INTEGER，模式为“Answer INTEGER”

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编辑：事实上，我发现我不能在同一个查询中放置两个集合。但是，我不知道如何将我的查询分离到一个准备好的语句中。有什么帮助吗

创建准备好的语句是一条路。我会这样修复您的代码（主要错误没有逗号，在sql语句中使用set两次）：

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有关更多信息，请参见：

stacktrace中是否有错误？if语句的前两个条件是same@cricket_007谢谢你的通知。Jibbo不，我没有收到任何信息，我的数据库正常填写，但在字段中回答为NULL！！在任何情况下，您都应该使用PreparedStatement，而不是原始sql查询来阻止sql注入。我对sqlite有点陌生，所以您能告诉我如何创建PreparedStatement吗？

try 
  {
  int saveSpeed = gui.saveSpeedInt - gui.saveSpeedTimer;
  String query2;
  int answer = 1;
  if(gui.textAnswerQ.equals(gui.saveAnswer.getText()) || gui.textAnswerToFQ.equals(gui.saveAnswer.getText()) || gui.SanswerTextField.getText().equals(gui.saveAnswer.getText())){
    answer = 1;
  }
  else{
    answer = 0;
  }
  query2 = "update StudentsQuestions set Time = ?, Answer = ? where UserName = ? and Question = ?";
  PreparedStatement pst2 = gui.connectionUsers.prepareStatement(query2);
  pst2.setInt(1, saveSpeed);
  pst2.setInt(2, answer);
  pst2.setString(3, gui.saveUser.getText());
  pst2.setString(4, gui.question.getText());
  pst2.execute();
  pst2.close();
 }