什么是表示以降序我的数据的最有效的方法？

 公共字符串getRank（）{

    的String []排名=新的String [] {KEY_ROWID};
    光标C = scoreDb.query（DATABASE_TABLE，等级，NULL，NULL，NULL，NULL，NULL）; //从数据库读取信息。
    字符串rankResult =;

    INT iRow = c.getColumnIndex（KEY_ROWID）; //光标在寻找列设置等于这些整数。


    为（c.moveToFirst（）;！c.isAfterLast（）; c.moveToNext（））{
        //移动到第一行 - 在光标开始并移动到下一行，只要它不是最后一行之后。
        rankResult = rankResult + c.getString（iRow）+\ N的;
        //返回行的价值，这是目前。
    }
    返回rankResult; //返回结果
}

公共字符串的getName（）{

    的String [] NAME =新的String [] {} KEY_NAME;
    光标C = scoreDb.query（DATABASE_TABLE，姓名，NULL，NULL，NULL，NULL，NULL）; //从数据库读取信息。
    字符串nameResult =;

    INT iRow1 = c.getColumnIndex（KEY_NAME）; //光标在寻找列设置等于这些整数。


    为（c.moveToFirst（）;！c.isAfterLast（）; c.moveToNext（））{
        //移动到第一行 - 在光标开始并移动到下一行，只要它不是最后一行之后。
        nameResult = nameResult + c.getString（iRow1）+\ N的;
        //返回行的价值，这是目前。
    }
    返回nameResult; //返回结果
}

公共字符串getScore（）{

    的String []得分=新的String [] {KEY_SCORE};
    光标C = scoreDb.query（DATABASE_TABLE，得分，NULL，NULL，NULL，NULL，NULL）; //从数据库读取信息。
    字符串scoreResult =;

    INT iRow2 = c.getColumnIndex（KEY_SCORE）; //光标在寻找列设置等于这些整数。


    为（c.moveToFirst（）;！c.isAfterLast（）; c.moveToNext（））{
        //移动到第一行 - 在光标开始并移动到下一行，只要它不是最后一行之后。
        scoreResult = scoreResult + c.getString（iRow2）+\ N的;
        //返回行的价值，这是目前。
    }
    返回scoreResult; //返回结果
}
 

解决方案

查询有两种语法，你正在使用的语法，最后一列重presents订购由，你只需要指定你想要做的事列排序依据+ASC（或）排序依据+降序

 光标C = scoreDb.query（DATABASE_TABLE，等级，NULL，NULL，NULL，NULL，yourColumn +降序）;
 

请参照this文档更加了解查询方法。

What is the most efficient method of showing my data in descending order?

public String getRank() {

    String[] rank = new String[]{ KEY_ROWID };
    Cursor c = scoreDb.query(DATABASE_TABLE, rank, null, null, null, null, null);   //reading information from db.
    String rankResult = "";

    int iRow = c.getColumnIndex(KEY_ROWID); //Cursor looking for column setting equal to these ints.


    for (c.moveToFirst(); !c.isAfterLast(); c.moveToNext()) { 
        //Move to first row - where cursor starts and moves to next row as long it is not after last row.
        rankResult = rankResult + c.getString(iRow) + "\n"; 
        //Returning value of row that it is currently on.
    }
    return rankResult;  //returning result
}

public String getName() {

    String[] name = new String[]{ KEY_NAME };
    Cursor c = scoreDb.query(DATABASE_TABLE, name, null, null, null, null, null);   //reading information from db.
    String nameResult = "";

    int iRow1 = c.getColumnIndex(KEY_NAME); //Cursor looking for column setting equal to these ints.


    for (c.moveToFirst(); !c.isAfterLast(); c.moveToNext()) { 
        //Move to first row - where cursor starts and moves to next row as long it is not after last row.
        nameResult = nameResult + c.getString(iRow1) + "\n"; 
        //Returning value of row that it is currently on.
    }
    return nameResult;  //returning result
}

public String getScore() {

    String[] score = new String[]{ KEY_SCORE };
    Cursor c = scoreDb.query(DATABASE_TABLE, score, null, null, null,null, null);   //reading information from db.
    String scoreResult = "";

    int iRow2 = c.getColumnIndex(KEY_SCORE); //Cursor looking for column setting equal to these ints.


    for (c.moveToFirst(); !c.isAfterLast(); c.moveToNext()) { 
        //Move to first row - where cursor starts and moves to next row as long it is not after last row.
        scoreResult = scoreResult + c.getString(iRow2) + "\n"; 
        //Returning value of row that it is currently on.
    }
    return scoreResult; //returning result
}

Query has two syntax, the syntax you are using, last column represents order by, you just need to specify on what column you want to do orderby +"ASC" (or) orderby +"DESC"

Cursor c = scoreDb.query(DATABASE_TABLE, rank, null, null, null, null, yourColumn+" DESC"); 

Refer this documentation to understand more about query method.