Question

我有一个包含两列名称和分数的表格。我说并且它有10个带有得分的名字，我想要用最低分来替换这一行如果新分数大于或等于表格中的最低分数，则使用新名称和分数。

我设法获得了最高值的ResultSet，但我没有用新的名称和分数替换它（在java中）。

String newName = "Test";
int score = 12345;
ResultSet result;
Statement stat = conn.createStatement();
result = stat.executeQuery("SELECT * FROM Highscore ORDER BY Score DESC");
result.next();
if(result.getInt(2) <= score) {
    // enter code here
}

Answer 1

尝试这样的事情

            String newName = "Test";
            int score = 12345;
            int newScore = 54321;
            ResultSet result;
            Statement stat = conn.createStatement();
            result = stat.executeQuery("SELECT * FROM Highscore ORDER BY Score ASC");// use DESC if u want to replace the highest value
            result.next(); 
            if(result.getInt(2) <= score)
            {
               PreparedStatement preparedStatement = conn.prepareStatement("UPDATE  Highscore  SET Name =? Score = ? WHERE Score = ?");
               preparedStatement.setString(1, newName);
               preparedStatement.setString(2, newScore);
               preparedStatement.setString(3, result.getInt(2));
               int updateCount = preparedStatement.executeUpdate();
            }

Answer 2

You can use following code to update lowest score record : 

String newName = "Test";
int score = 12345;
ResultSet result;
PreparedStatement ps = conn.prepareStatement("UPDATE Highscore SET NAME = ?, SCORE = ? WHERE SCORE = (SELECT MIN(SCORE) FROM Highscore)");
ps.setString(1, newName);
ps.setInt(2, score);
int updatedCount = ps.executeUpdate();
if(updatedCount>0) 
System.out.println("Record Successfully updated");

hsqldb - 如何替换我的Highscore（包含前10个）表中的值

2 个答案: