根据两个不同的 ID 获取记录

Question

在只有一个ID可以查询的情况下，我已经能够从SQLite数据库中获取记录了。例如，我已将我的联盟 ID 传递给保龄球手 Table，并且我列出了与此 ID 关联的所有保龄球手。现在，当我为这个投球手创建一个系列时，我将联盟 ID 和投球手 ID 传递给系列 table 以确保我只获得属于某个联盟中那个投球手的系列。

为了列出投球手，我使用了以下代码；

public Bowler getBowler(String leagueId) {
        //Get Readable Database If We Are Not Inserting Anything
        SQLiteDatabase db = this.getReadableDatabase();

        Cursor cursor = db.query(Bowler.TABLE_NAME,
                new String[]{Bowler.COLUMN_ID, Bowler.COLUMN_LEAGUE_ID, Bowler.COLUMN_NAME, Bowler.COLUMN_TIMESTAMP},
                Bowler.COLUMN_LEAGUE_ID + "=?",
                new String[]{String.valueOf(leagueId)}, null, null, null, null);

        if (cursor != null)
            cursor.moveToFirst();

        //Prepare Bowler Object
        Bowler bowler = new Bowler(
                cursor.getInt(cursor.getColumnIndex(Bowler.COLUMN_ID)),
                cursor.getString(cursor.getColumnIndex(Bowler.COLUMN_LEAGUE_ID)),
                cursor.getString(cursor.getColumnIndex(Bowler.COLUMN_NAME)),
                cursor.getString(cursor.getColumnIndex(Bowler.COLUMN_TIMESTAMP)));

        //Close Database Connection
        cursor.close();

        return bowler;
    }

为了列出保龄球系列，我尝试了以下方法；

public Series getSeries(String leagueId, String bowlerId) {
        //Get Readable Database If We Are Not Inserting Anything
        SQLiteDatabase db = this.getReadableDatabase();

        Cursor cursor = db.query( Series.TABLE_NAME,
                new String[]{Series.COLUMN_ID, Series.COLUMN_LEAGUE_ID, Series.COLUMN_BOWLER_ID, Series.COLUMN_NAME, Series.COLUMN_SERIES_AVERAGE, Series.COLUMN_TIMESTAMP},
                Series.COLUMN_LEAGUE_ID + Series.COLUMN_BOWLER_ID + "=?",
                new String[]{String.valueOf(leagueId)}, null, null, null, null)
                new String[]{String.valueOf(bowlerId)}, null, null, null, null);

        if (cursor != null)
            cursor.moveToFirst();

        //Prepare Bowler Object
        Series series = new Series(
                cursor.getInt(cursor.getColumnIndex(Series.COLUMN_ID)),
                cursor.getString(cursor.getColumnIndex(Series.COLUMN_LEAGUE_ID)),
                cursor.getString(cursor.getColumnIndex(Series.COLUMN_BOWLER_ID)),
                cursor.getString(cursor.getColumnIndex(Series.COLUMN_NAME)),
                cursor.getString(cursor.getColumnIndex(Series.COLUMN_SERIES_AVERAGE)),
                cursor.getString(cursor.getColumnIndex(Series.COLUMN_TIMESTAMP)));

        //Close Database Connection
        cursor.close();

        return series;
    }

我知道这是不正确的，但我不知道如何正确设置格式。

我不确定这是否是正确的方法，或者是否有另一种方法可以更容易地完成同样的事情。

Answer 1

您的 selection 查询似乎不正确。您正在尝试从两个单独的列中 select。

你有： "WHERE series_idbowler_id =?"

你想要的是" "WHERE series_id =? AND bowler_id =?"

尝试像这样格式化您的查询：

db.query( Series.TABLE_NAME,
            new String[]{Series.COLUMN_ID, Series.COLUMN_LEAGUE_ID, Series.COLUMN_BOWLER_ID, Series.COLUMN_NAME, Series.COLUMN_SERIES_AVERAGE, Series.COLUMN_TIMESTAMP},
            Series.COLUMN_LEAGUE_ID + "=?" + " AND " +  Series.COLUMN_BOWLER_ID + "=?",
            new String[]{String.valueOf(leagueId), String.valueOf(bowlerId)}, null, null, null, null);

根据两个不同的 ID 获取记录

Getting Records Based Off Of Two Different ID's

javascript

sqlite

android

recordset