Android SQLite查询错误 "no such column"-6ren

Android SQLite查询错误 "no such column"

转载作者：行者123 更新时间：2023-11-30 01:13:03

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全部。我正在使用 SQLite 完成一项作业。我真的很感激能帮助我。

情况是很简单的SQL查询但是不起作用

public class TasksDBHelper extends SQLiteOpenHelper {

    private static final String LOGTAG = "Task Manager";

    public static final String DB_COL_TITLE = "title";
    public static String DB_COL_DESCRIPTION = "description";
    public static String DB_COL_DUEDATE = "duedate";
    public static String DB_COL_CATEGORY = "category";
    public static String DB_COL_PRIORITY = "priority";
    public static String DB_COL_BODY = "body";

    public static String DB_COL_ID = BaseColumns._ID; //same as setting to "_id"
    public static final String[] DB_ALL_COLUMNS = { DB_COL_ID, DB_COL_TITLE, DB_COL_DESCRIPTION, DB_COL_DUEDATE,
                                                    DB_COL_CATEGORY, DB_COL_PRIORITY};

    private static final String DB_NAME = "my_tasks.db";
    public  static final String DB_TABLE = "tasks";
    private static final int DB_VERSION = 1;

    private static final String DB_TABLE_CREATE =
            "CREATE TABLE tasks (" +
                    DB_COL_ID + " integer primary key autoincrement," +
                    DB_COL_TITLE + " text not null," +
                    DB_COL_DESCRIPTION + " text not null," +
                    DB_COL_DUEDATE + " text not null," +
                    DB_COL_CATEGORY + " text not null," +
                    DB_COL_PRIORITY + " text not null);";

    private static TasksDBHelper INSTANCE;
    public static TasksDBHelper getInstance(Context ctx){
        if (INSTANCE == null)
            INSTANCE = new TasksDBHelper(ctx.getApplicationContext());

        return INSTANCE;
    }

    private TasksDBHelper(Context context) {
        super(context, DB_NAME, null, DB_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        Log.d(LOGTAG, "onCreate() of the SQLite Demo");
        db.execSQL(DB_TABLE_CREATE);
        Log.d(LOGTAG, "Notes DB table created");
        //Populate with some sample notes
        ContentValues cv = new ContentValues();
        for (int i = 0; i < 10; i++) {
            cv.put(DB_COL_TITLE, String.format("Title : %d", i));
            cv.put(DB_COL_DESCRIPTION, String.format("Body : %d", i));
            cv.put(DB_COL_DUEDATE, String.format("Body : %d", i));
            cv.put(DB_COL_CATEGORY, String.format("Body : %d", i));
            cv.put(DB_COL_PRIORITY, String.format("Body : %d", i));
            db.insert(DB_TABLE, null, cv);
        }
    }

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

    /////CRUD Methods

    public Task createTask(Task task) {
        Log.d(LOGTAG, "Calling createNote()");

        SQLiteDatabase db = getWritableDatabase();
        ContentValues cv = new ContentValues();

        cv.put(TasksDBHelper.DB_COL_TITLE, task.getTitle());
        cv.put(TasksDBHelper.DB_COL_DESCRIPTION, task.getDescription());
        cv.put(TasksDBHelper.DB_COL_DUEDATE, task.getDuedate());
        cv.put(TasksDBHelper.DB_COL_CATEGORY, task.getCategory());
        cv.put(TasksDBHelper.DB_COL_PRIORITY, task.getPriority());

        long id =  db.insert(TasksDBHelper.DB_TABLE, null, cv);
        task.setId(id);
        Log.d(LOGTAG, "Task created : " + id);
        return task;
    }

    public int updateTask(Task task) {
        Log.d(LOGTAG, "Calling updateNote()");

        SQLiteDatabase notesDB = getWritableDatabase();
        ContentValues cv = new ContentValues();

        cv.put(TasksDBHelper.DB_COL_TITLE, task.getTitle());
        cv.put(TasksDBHelper.DB_COL_DESCRIPTION, task.getDescription());
        cv.put(TasksDBHelper.DB_COL_DUEDATE, task.getDuedate());
        cv.put(TasksDBHelper.DB_COL_CATEGORY, task.getCategory());
        cv.put(TasksDBHelper.DB_COL_PRIORITY, task.getPriority());
        return notesDB.update(TasksDBHelper.DB_TABLE, cv, TasksDBHelper.DB_COL_ID + "=" + task.getId(), null);
    }


    public ArrayList<Task> getTasks() {
        Log.d(LOGTAG, "Calling getTasks()");
        SQLiteDatabase notesDB = getReadableDatabase();
        Cursor c = null;
        ArrayList<Task> tasks = new ArrayList<Task>();



        try {
            //c = notesDB.query(TasksDBHelper.DB_TABLE, TasksDBHelper.DB_ALL_COLUMNS, null, null, null, null, null);
            String query = String.format("SELECT _id, %s, %s, %s, %s, %s FROM %s", 
            TasksDBHelper.DB_COL_TITLE, TasksDBHelper.DB_COL_DESCRIPTION, TasksDBHelper.DB_COL_DUEDATE,
                     TasksDBHelper.DB_COL_CATEGORY, TasksDBHelper.DB_COL_PRIORITY, TasksDBHelper.DB_TABLE);

            c = notesDB.rawQuery(query, null);

            if ((c != null) && c.getCount() > 0 ) {
                while(c.moveToNext())
                    tasks.add(getNoteFromCursor(c));
            }
        }
        finally
        {
            if (c != null)
                c.close();
        }
        return tasks;
    }


    public Task getTask(long rowId) {
        Cursor c = null;
        Task task = null;
        Log.d(LOGTAG, "Calling getNote()");
        SQLiteDatabase tasksDB = getReadableDatabase();

        try {
            c = tasksDB.query(TasksDBHelper.DB_TABLE, new String[]
                            { TasksDBHelper.DB_COL_ID, TasksDBHelper.DB_COL_TITLE,
                                    TasksDBHelper.DB_COL_DESCRIPTION, TasksDBHelper.DB_COL_DUEDATE,
                                    TasksDBHelper.DB_COL_CATEGORY, TasksDBHelper.DB_COL_PRIORITY},
                    TasksDBHelper.DB_COL_ID + "=" + rowId, null, null, null, null);
            if (c != null)
                c.moveToFirst();
            task = getNoteFromCursor(c);
            return task;

        } catch (Exception e) {
            Log.e(LOGTAG, "Error on getNote()", e);
        }
        finally {
            if (c != null)
                c.close();
        }
        return task;

    }

    public boolean delete(long rowId) {
        SQLiteDatabase notesDB = getWritableDatabase();
        return notesDB.delete(TasksDBHelper.DB_TABLE, TasksDBHelper.DB_COL_ID + "=" + rowId, null) > 0;
    }


    private static Task getTaskFromCursor(Cursor c){
        if ((c == null) || (c.getCount() == 0))
            return null;
        else {
            Task task = new Task();
            task.setId(c.getLong(c.getColumnIndex(TasksDBHelper.DB_COL_ID)));
            task.setTitle(c.getString(c.getColumnIndex(TasksDBHelper.DB_COL_TITLE)));
            task.setdescription(c.getString(c.getColumnIndex(TasksDBHelper.DB_COL_DESCRIPTION)));
            task.setdescription(c.getString(c.getColumnIndex(TasksDBHelper.DB_COL_DUEDATE)));
            task.setdescription(c.getString(c.getColumnIndex(TasksDBHelper.DB_COL_CATEGORY)));
            task.setdescription(c.getString(c.getColumnIndex(TasksDBHelper.DB_COL_PRIORITY)));
            return task;
        }

    }
}

07-06 00:35:23.621 5558-5558/? E/AndroidRuntime: FATAL EXCEPTION: main Process: com.comp3617.assignment3.chiseongoh, PID: 5558 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.comp3617.assignment3.chiseongoh/com.comp3617.assignment3.chiseongoh.DisplayTasksActivity}: android.database.sqlite.SQLiteException: no such column: title (code 1): , while compiling: SELECT _id, title, description, duedate, category, priority FROM tasks at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) at android.app.ActivityThread.-wrap11(ActivityThread.java) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:148) at android.app.ActivityThread.main(ActivityThread.java:5417) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) Caused by: android.database.sqlite.SQLiteException: no such column: title (code 1): , while compiling: SELECT _id, title, description, duedate, category, priority FROM tasks at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method) at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:887) at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:498) at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588) at android.database.sqlite.SQLiteProgram.(SQLiteProgram.java:58) at android.database.sqlite.SQLiteQuery.(SQLiteQuery.java:37) at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:44) at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1316) at android.database.sqlite.SQLiteDatabase.rawQuery(SQLiteDatabase.java:1255) at com.comp3617.assignment3.chiseongoh.db.TasksDBHelper.getTasks(TasksDBHelper.java:128) at com.comp3617.assignment3.chiseongoh.DisplayTasksActivity.bindListViewToNotes(DisplayTasksActivity.java:76) at com.comp3617.assignment3.chiseongoh.DisplayTasksActivity.onCreate(DisplayTasksActivity.java:71) at android.app.Activity.performCreate(Activity.java:6237) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) at android.app.ActivityThread.-wrap11(ActivityThread.java) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:148) at android.app.ActivityThread.main(ActivityThread.java:5417) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

这里有错误

public Task getTask(long rowId) {
        Cursor c = null;
        Task task = null;
        Log.d(LOGTAG, "Calling getNote()");
        SQLiteDatabase tasksDB = getReadableDatabase();

        try {
            c = tasksDB.query(TasksDBHelper.DB_TABLE, new String[]
                            { TasksDBHelper.DB_COL_ID, TasksDBHelper.DB_COL_TITLE,
                                    TasksDBHelper.DB_COL_DESCRIPTION, TasksDBHelper.DB_COL_DUEDATE,
                                    TasksDBHelper.DB_COL_CATEGORY, TasksDBHelper.DB_COL_PRIORITY},
                    TasksDBHelper.DB_COL_ID + "=" + rowId, null, null, null, null);
            if (c != null)
                c.moveToFirst();
            task = getNoteFromCursor(c);
            return task;

        } catch (Exception e) {
            Log.e(LOGTAG, "Error on getNote()", e);
        }
        finally {
            if (c != null)
                c.close();
        }
        return task;

    }

谢谢!

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Android SQLite查询错误 "no such column"