2つのテーブルを1つではなく2つのテーブルで実行する

Question

私は4つのテーブルを持つデータベースを持っています。中に私は今のところ必要

設定

映画

トレーラー

レビュー

final String SQL_CREATE_MOVIE__SETTING_TABLE = "CREATE TABLE " + MovieContract.MovieSettings.TABLE_NAME + " (" + 
      MovieContract.MovieEntry._ID + " INTEGER PRIMARY KEY, " + 
      MovieContract.MovieSettings.COL_MOVIE_SETTING + " TEXT UNIQUE NOT NULL " + 
      ");"; 

    final String SQL_CREATE_MOVIE_TABLE = "CREATE TABLE " + MovieContract.MovieEntry.TABLE_NAME + " (" + 
      MovieContract.MovieEntry._ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + 
      MovieContract.MovieEntry.COL_MOVIE_KEY + " INTEGER NOT NULL, " + 
      MovieContract.MovieEntry.COL_MOVIE_ID + " INTEGER NOT NULL, " + 
      MovieContract.MovieEntry.COL_BACKDROP_PATH + " TEXT NOT NULL, " + 
      MovieContract.MovieEntry.COL_ORIGINAL_LANGUAGE + " TEXT NOT NULL, " + 
      MovieContract.MovieEntry.COL_ORIGINAL_TITLE + " TEXT NOT NULL," + 
      MovieContract.MovieEntry.COL_OVERVIEW + " TEXT NOT NULL, " + 
      MovieContract.MovieEntry.COL_TITLE + " TEXT NOT NULL, " + 
      MovieContract.MovieEntry.COL_VOTE_AVERAGE + " REAL NOT NULL, " + 
      MovieContract.MovieEntry.COL_VOTE_COUNT + " INTEGER NOT NULL, " + 
      MovieContract.MovieEntry.COL_POSTER_PATH + " TEXT NOT NULL, " + 
      MovieContract.MovieEntry.COL_DATE + " TEXT NOT NULL, " + 

      // Set up the location column as a foreign key to location table. 
      " FOREIGN KEY (" + MovieContract.MovieEntry.COL_MOVIE_KEY + ") REFERENCES " + 
      MovieContract.MovieSettings.TABLE_NAME + " (" + MovieContract.MovieSettings._ID + "), " + 

      // To assure the application have just one weather entry per day 
      // per location, it's created a UNIQUE constraint with REPLACE strategy 
      " UNIQUE (" + MovieContract.MovieEntry.COL_DATE + ", " + 
      MovieContract.MovieEntry.COL_MOVIE_KEY + ") ON CONFLICT REPLACE);"; 

    final String SQL_CREATE_TRAILER_TABLE = "CREATE TABLE " + MovieContract.TrailerEntry.TABLE_NAME + " (" + 
      MovieContract.TrailerEntry._ID + " INTEGER PRIMARY KEY," + 
      MovieContract.TrailerEntry.COL_MOVIE_ID + " INTEGER NOT NULL, " + 
      MovieContract.TrailerEntry.COL_TRAILER_ID + " TEXT NOT NULL, " + 
      MovieContract.TrailerEntry.COL_ISO_369_1 + " TEXT NOT NULL, " + 
      MovieContract.TrailerEntry.COL_KEY + " TEXT NOT NULL, " + 
      MovieContract.TrailerEntry.COL_NAME + " TEXT NOT NULL, " + 
      MovieContract.TrailerEntry.COL_SITE + " TEXT NOT NULL, " + 
      MovieContract.TrailerEntry.COL_SIZE + " TEXT NOT NULL, " + 
      MovieContract.TrailerEntry.COL_TYPE + " TEXT NOT NULL, " + 


      // Set up the movie_id column as a foreign key to movie table. 
      " FOREIGN KEY (" + MovieContract.TrailerEntry.COL_MOVIE_ID + ") REFERENCES " + 
      MovieContract.MovieEntry.TABLE_NAME + " (" + MovieContract.MovieEntry.COL_MOVIE_ID + ") " + 

      " UNIQUE (" + MovieContract.TrailerEntry.COL_MOVIE_ID + ", " + 
      MovieContract.TrailerEntry.COL_TRAILER_ID + ") ON CONFLICT REPLACE);"; 

    final String SQL_CREATE_REVIEW_TABLE = "CREATE TABLE " + MovieContract.ReviewEntry.TABLE_NAME + " (" + 
      MovieContract.ReviewEntry._ID + " INTEGER PRIMARY KEY," + 
      MovieContract.ReviewEntry.COL_MOVIE_ID + " INTEGER NOT NULL, " + 
      MovieContract.ReviewEntry.COL_REVIEW_ID + " TEXT NOT NULL, " + 
      MovieContract.ReviewEntry.COL_AUTHOR + " TEXT NOT NULL, " + 
      MovieContract.ReviewEntry.COL_CONTENT + " TEXT NOT NULL, " + 
      MovieContract.ReviewEntry.COL_URL + " TEXT NOT NULL, " + 

      // Set up the movie_id column as a foreign key to movie table. 
      " FOREIGN KEY (" + MovieContract.ReviewEntry.COL_MOVIE_ID + ") REFERENCES " + 
      MovieContract.MovieEntry.TABLE_NAME + " (" + MovieContract.MovieEntry.COL_MOVIE_ID + ") " + 

      " UNIQUE (" + MovieContract.ReviewEntry.COL_MOVIE_ID + ", " + 
      MovieContract.ReviewEntry.COL_REVIEW_ID + ") ON CONFLICT REPLACE);"; 

トレーラーテーブルをムービーテーブルに結合します。したがって、新しいトレーラーテーブルには次の列が必要です。

---------------------------------------------------------------------------------- 
|_id |movie_id |poster_path |id |iso_639_1 |key |name |site |size |type | 

どちらは列が映画のテーブルに属しとposter_pathをmovie_id。私はposter_path列が欠落している。この表

-------------------------------------------------------------------- 
|_id |movie_id |id |iso_639_1 |key |name |site |size |type | 

を得る。しかし

sTrailerByMovieIdQueryBuilder.setTables(
      MovieContract.TrailerEntry.TABLE_NAME + " INNER JOIN " + 
      MovieContract.MovieEntry.TABLE_NAME + " ON " + 
      MovieContract.TrailerEntry.TABLE_NAME + "." + 
      MovieContract.TrailerEntry.COL_MOVIE_ID + " = " + 
      MovieContract.MovieEntry.TABLE_NAME + "." + 
      MovieContract.MovieEntry.COL_MOVIE_ID + " AND " + 
      MovieContract.MovieEntry.TABLE_NAME + "." + 
      MovieContract.MovieEntry.COL_POSTER_PATH 
     ); 

として内部結合を行います。私は私の内側の結合で何か間違っていましたが、私はそれを修正する方法がわかりません。ありがとう、

Theo。

Answer 1

poster_path列が存在しない理由は、クエリで別の内部結合を呼び出すことができなかったためです。

現在、クエリは次のようになります。後

... 
INNER JOIN movies m1 
ON trailers.movie_id = m1.movie_id 
INNER JOIN movies m2 
ON trailers.poster_path = m2.poster_path