Question

我正在尝试将图像URL（String）放入具有SqlHelper类的数据库中。但是当我这样做时我遇到了一些错误。我试过很多方面，但是得到了同样的错误。也许我不能把http链接放在数据库中？

以下是我的DB助手：

public class SqlHelper {
String title;
    String description;
    String image;
    private static final String TEXT_TYPE = " TEXT";
    private static final String COMMA_SEP = ",";
    public static final String KEY_ROWID = "_id";
    public static final String KEY_TITLE = "title";
    public static final String KEY_DESCRIPTION = "description";
    public static final String KEY_IMAGE = "image";
private SqlHelper mDb;
    private static final String DATABASE_NAME = "DBCategory";
    private static final String DATABASE_TABLE = "categoryTable";
    private static final int DATABASE_VERSION = 1;
    private static final String SQL_CREATE_ENTRIES =
            "CREATE TABLE " + DATABASE_TABLE + " (" +
                    KEY_ROWID + " INTEGER PRIMARY KEY," +
                    KEY_TITLE + TEXT_TYPE + COMMA_SEP +
                    KEY_DESCRIPTION + TEXT_TYPE + COMMA_SEP + KEY_IMAGE + TEXT_TYPE +

            " )";
    private DbHelper ourHelper;
    private final Context ourContext;
    private SQLiteDatabase ourDatabase;

    public SqlHelper(Context c) throws SQLException {
        ourContext = c;
        try {
            open();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    public SqlHelper open() throws SQLException{
        ourHelper = new DbHelper(ourContext);
        ourDatabase = ourHelper.getWritableDatabase();
        return this;
    }

    public void close(){
        ourHelper.close();
    }





    private static class DbHelper extends SQLiteOpenHelper{

        public DbHelper(Context context) {
            super(context, DATABASE_NAME, null, DATABASE_VERSION);
            // TODO Auto-generated constructor stub
        }

        @Override
        public void onCreate(SQLiteDatabase db) {
            db.execSQL("CREATE TABLE " + DATABASE_TABLE + " (" +
                            KEY_ROWID + " INTEGER PRIMARY KEY AUTOINCREMENT," +
                            KEY_TITLE + " TEXT NOT NULL," + KEY_IMAGE + " TEXT NOT NULL," + KEY_DESCRIPTION + " TEXT NOT NULL );"
            );
        }

        @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
            db.execSQL("DROP TABLE IF EXISTS " + DATABASE_TABLE);
            onCreate(db);
        }

    }

    public long createEntry(String title, String image,String description) {
        ContentValues cv = new ContentValues();
        cv.put(KEY_TITLE, title);
        cv.put(KEY_IMAGE, image);
        cv.put(KEY_DESCRIPTION,description);

        return ourDatabase.insert(DATABASE_TABLE, null, cv);
    }

    public ArrayList<HashMap<String, String>> getAllData()
    {
        ArrayList<HashMap<String, String>> array_list = new ArrayList<HashMap<String, String>>();

        //hp = new HashMap();
        SQLiteDatabase db = this.ourHelper.getReadableDatabase();
        Cursor res =  db.rawQuery( "select * from categoryTable", null );
        res.moveToFirst();

        while(res.isAfterLast() == false){

            HashMap<String,String>  hashmap = new HashMap<String, String>();
            hashmap.put("title", res.getString(res.getColumnIndex(title)));
            hashmap.put("description", res.getString(res.getColumnIndex(description)));
            hashmap.put("image", res.getString(res.getColumnIndex(image)));


            array_list.add(hashmap);
            res.moveToNext();
        }
        return array_list;
    }
}

错误：

11910-11929/com.example.vnvbnv.myapplication E/SQLiteLog﹕ (1) table categoryTable has no column named image
09-25 15:56:46.467  11910-11929/com.example.vnvbnv.myapplication E/SQLiteDatabase﹕ Error inserting image=http://moi-pushistye-druzya.narod.ru/images/00073.jpg title=Случайный хомяк 27 description=Случайное фото случайного хомячка. Он тут — для массовости!
    android.database.sqlite.SQLiteException: table categoryTable has no column named image (code 1): , while compiling: INSERT INTO categoryTable(image,title,description) VALUES (?,?,?)
            at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
            at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:909)
            at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:520)
            at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
            at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
            at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31)
            at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1523)
            at android.database.sqlite.SQLiteDatabase.insert(SQLiteDatabase.java:1395)
            at com.example.vnvbnv.myapplication.SqlHelper.createEntry(SqlHelper.java:93)
            at com.example.vnvbnv.myapplication.MainActivity$ProgressTask.doInBackground(MainActivity.java:159)
            at com.example.vnvbnv.myapplication.MainActivity$ProgressTask.doInBackground(MainActivity.java:113)
            at android.os.AsyncTask$2.call(AsyncTask.java:287)
            at java.util.concurrent.FutureTask.run(FutureTask.java:234)
            at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
            at java.lang.Thread.run(Thread.java:864)

Answer 1

您是否尝试过卸载应用并再次运行？

错误说＆＃34; table categoryTable has no column named image＆＃34;如果您使用列表较少的数据库表测试应用程序并在稍后的时间点在数据库中引入列，则会出现这种情况。

使用其他列重新启动应用后，旧版本的DB已经存在，并且不会调用DBHelper的onCreate，并且不会在表中添加新列。

卸载应用程序将清除以前的任何DB实例，并且将再次调用onCreate，您将从一个新表开始。

尝试将图像放入sqlite

1 个答案: