Question

我没有得到它，即使我检查代码是正确的，它仍然会崩溃。它只是一直告诉我没有这样的专栏日期。我将在这里发布我的代码用于DBHelper类。

private static final String DATABASE_NAME = "tasks.db";
private static final int DATABASE_VERSION = 1;
private static final String TABLE_TASK = "tasks";
private static final String COLUMN_ID = "id";
private static final String COLUMN_NAME = "name";
private static final String COLUMN_DESCRIPTION = "description";
private static final String COLUMN_DATE = "date"; 

 @Override
public void onCreate(SQLiteDatabase db) {
    String createTaskTableSql = "CREATE TABLE " + TABLE_TASK + "("
            + COLUMN_ID + " INTEGER PRIMARY KEY AUTOINCREMENT,"
            + COLUMN_NAME + " TEXT, "
            + COLUMN_DESCRIPTION + " TEXT, "
            + COLUMN_DATE + " DATETIME DEFAULT CURRENT_TIMESTAMP )";
    db.execSQL(createTaskTableSql);
}

 public ArrayList<Lists> getAllLists() {
    ArrayList<Lists> lists = new ArrayList<Lists>();

    String selectQuery = "SELECT " + COLUMN_ID + ", "
            + COLUMN_NAME + ", "  + COLUMN_DESCRIPTION + ", " + COLUMN_DATE  + " FROM " + TABLE_TASK;

    SQLiteDatabase db = this.getReadableDatabase();
    Cursor cursor = db.rawQuery(selectQuery, null);
    if (cursor.moveToFirst()) {
        do {
            int id = cursor.getInt(0);
            String listsName = cursor.getString(1);
            String desc = cursor.getString(2);
            String date = cursor.getString(3);
            Lists allLists = new Lists(id, listsName, desc, date);
            lists.add(allLists);
        } while (cursor.moveToNext());
    }
    cursor.close();
    db.close();
    return lists;
}

我无法确定问题所在。有人请帮帮我。

Answer 1

没有这样的列日期

你有两个选择。

你应该卸载app＆amp;再次运行。
或者您可以纠正 onUpgrade 方法。

<强> DO

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

    // If you want to add a column
    if (newVersion > oldVersion) {
        db.execSQL("ALTER TABLE ADD_NAME ADD COLUMN NEW_COLOUM INTEGER DEFAULT 0"); // You can add TEXT Field
    }
}

引起：android.database.sqlite.SQLiteException：没有这样的列：date（代码1）:,同时编译：SELECT id，name，description，date FROM tasks

1 个答案: