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Android SQLite数据库列不存在错误_Android_Sqlite - Fatal编程技术网

Android SQLite数据库列不存在错误

Android SQLite数据库列不存在错误,android,sqlite,Android,Sqlite,我一直收到有关sql数据库的错误消息 新错误 07-03 01:52:08.037:ERROR/AndroidRuntime(627):java.lang.RuntimeException:无法启动活动组件信息{com.fttech.books/com.fttech.books.viewBooks}:android.database.sqlite.SQLiteException:无此类列:作者:,编译时:从集合中选择书籍、作者、isbn、评级 07-03 00:15:04.807:INFO/Da

我一直收到有关sql数据库的错误消息

新错误


07-03 01:52:08.037:ERROR/AndroidRuntime(627):java.lang.RuntimeException:无法启动活动组件信息{com.fttech.books/com.fttech.books.viewBooks}:android.database.sqlite.SQLiteException:无此类列:作者:,编译时:从集合中选择书籍、作者、isbn、评级

07-03 00:15:04.807:INFO/Database(927):sqlite返回:错误代码=1,消息=no这样的列:book

现在我在新的模拟器上遇到了这个错误

07-03 00:33:27.887:INFO/Database(384):sqlite返回:错误代码=1,消息=no这样的表:集合

这是我使用的数据库代码

public class booksDbAdapter {

    private static final String DATABASE_NAME = "collection";
    private static final String DATABASE_TABLE = "collection";
    private static final int DATABASE_VERSION = 1;

    public static final String KEY_BOOK = "book";
    public static final String KEY_AUTHOR = "author";
    public static final String KEY_ISBN = "isbn";
    public static final String KEY_RATING = "rating";
    public static final String KEY_ROWID = "_id";

    private DatabaseHelper mDbHelper;
    private SQLiteDatabase mDb;

    private static final String DATABASE_CREATE =
                    " create table " + " DATABASE_TABLE " + " ("
                    + KEY_ROWID + " integer primary key autoincrement,      "
                    + KEY_BOOK + " text not null, "
                    + KEY_ISBN + " text not null, "
                    + KEY_RATING + " text not null);";

    private final Context mCtx;

    public booksDbAdapter (Context ctx){
        this.mCtx = ctx;
    }

    private static class DatabaseHelper extends SQLiteOpenHelper{
        DatabaseHelper(Context context){
            super(context, DATABASE_NAME, null, DATABASE_VERSION);
        }

        @Override
        public void onCreate(SQLiteDatabase db) {
            db.execSQL(DATABASE_CREATE);
        }

        @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
            // TODO Auto-generated method stub
        }
    }
    public booksDbAdapter open() throws SQLException{
        mDbHelper =  new DatabaseHelper(mCtx);
        mDb = mDbHelper.getWritableDatabase();
        return this;
    }
    public void close(){
        mDbHelper.close();
    }

    public long createBook(String book, String author, String isbn, String rating){
        ContentValues initialValues = new ContentValues();
        initialValues.put(KEY_BOOK, book);
        initialValues.put(KEY_AUTHOR, author);
        initialValues.put(KEY_ISBN, isbn);
        initialValues.put(KEY_RATING, rating);

        return mDb.insert(DATABASE_TABLE, null, initialValues);
    }
    public boolean deleteBook(long rowId){
        return mDb.delete(DATABASE_TABLE, KEY_ROWID + "=" + rowId, null) > 0;
    }
    public Cursor fetchAllBooks(){
        return mDb.query(DATABASE_TABLE, new String[]{KEY_BOOK, KEY_AUTHOR, KEY_ISBN, KEY_RATING}, null, null, null, null, null);
    }
    public Cursor fetchBook(long rowId) throws SQLException{
        Cursor mCursor =
        mDb.query(DATABASE_TABLE, new String[]{KEY_BOOK, KEY_AUTHOR, KEY_ISBN, KEY_RATING}, KEY_ROWID + "=" +
                                rowId, null, null, null, null);

        if(mCursor != null){
            mCursor.moveToFirst();
        }
        return mCursor;

    }
    public boolean updateBook(long rowId, String book, String author, String isbn, String rating){
        ContentValues args = new ContentValues();
        args.put(KEY_BOOK, book);
        args.put(KEY_AUTHOR, author);
        args.put(KEY_ISBN, isbn);
        args.put(KEY_RATING, rating);
        return mDb.update(DATABASE_TABLE, args, KEY_ROWID + "=" + rowId, null)> 0;
    }
}

啊,嗯,很明显,你是在创建表
数据库\u表
,而不是
集合
。重构时,您一定错误地保留了引号:

     "create table " + " DATABASE_TABLE " + " ("
我在你的数据库中没有看到作者栏,你的意思是:

private static final String DATABASE_CREATE =
                " create table " + " DATABASE_TABLE " + " ("
                + KEY_ROWID + " integer primary key autoincrement,      "
                + KEY_BOOK + " text not null, "
                + KEY_ISBN + " text not null, "
                + KEY_AUTHOR + " text not null, "
                + KEY_RATING + " text not null);";

您的代码看起来正常,您是否尝试过删除应用程序的数据?也许它有你创建的数据库的第一个实例,它没有这个列?是的,我的上一个数据库有这个列。它实际上拥有所有这些栏目。所以我现在在另一个模拟器上运行它,看看会发生什么。我刚刚编辑了关于问题,在顶部添加了我的新错误。我现在犯了这个错误你什么意思?我正在创建数据库表,而不是集合?Ohhhhhhnvm!我懂了!我刚修好。即将尝试它,看看它现在是否工作。它现在给我这个错误。。。07-03 01:48:11.096:INFO/Database(561):sqlite返回:错误代码=1,msg=没有这样的列:author07-03 01:52:08.037:error/AndroidRuntime(627):java.lang.RuntimeException:无法启动活动组件信息{com.fttech.books/com.fttech.books.viewBooks}:android.Database.sqlite.SQLiteException:没有这样的列:作者:,编译时:SELECT book、author、isbn、collectionauthor的评级也不在create语句中。
private static final String DATABASE_CREATE =
                " create table " + " DATABASE_TABLE " + " ("
                + KEY_ROWID + " integer primary key autoincrement,      "
                + KEY_BOOK + " text not null, "
                + KEY_ISBN + " text not null, "
                + KEY_AUTHOR + " text not null, "
                + KEY_RATING + " text not null);";