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我想保存并显示一个 sql 条目的创建日期。但是我的应用程序不断因这段代码而崩溃。任何帮助，将不胜感激！

这是保存笔记的保存状态方法：

private void saveState() {
    String title = mTitleText.getText().toString();
    String body = mBodyText.getText().toString();
    String color = mColor;
    String date=(DateUtils.formatDateTime(this, System.currentTimeMillis(), DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_NUMERIC_DATE ));
    //String date = FastDateFormat.getInstance("dd-MM-yyyy").format(System.currentTimeMillis( ));

    if(title != null && !title.isEmpty() || body != null && !body.isEmpty()){
        if (mRowId == null) {
            long id = mDbHelper.createNote(title, body, color, date);
            if (id > 0) {
                mRowId = id;
            }
        } else {
            mDbHelper.updateNote(mRowId, title, body, color, date);
        }
    }

这是数据库适配器：

public class NotesDbAdapter {

public static final String KEY_TITLE = "title";
public static final String KEY_BODY = "body";
public static final String KEY_ROWID = "_id";
public static final String KEY_COLOR = "color";
public static final String KEY_DATE = "date";

private static final String TAG = "NotesDbAdapter";
private DatabaseHelper mDbHelper;
private SQLiteDatabase mDb;

/**
 * Database creation sql statement
 */
private static final String DATABASE_CREATE =
    "create table notes (_id integer primary key autoincrement, "
    + "title text not null, body text not null, color text not null, date text not null);";

private static final String DATABASE_NAME = "data";
private static final String DATABASE_TABLE = "notes";
private static final int DATABASE_VERSION = 4;

private final Context mCtx;

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) {
        Log.w(TAG, "Upgrading database from version " + oldVersion + " to "
                + newVersion + ", which will destroy all old data");
        db.execSQL("DROP TABLE IF EXISTS notes");
        onCreate(db);
    }
}

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

public NotesDbAdapter open() throws SQLException {
    mDbHelper = new DatabaseHelper(mCtx);
    mDb = mDbHelper.getWritableDatabase();
    return this;
}

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

public long createNote(String title, String body, String color, String date) {
    ContentValues initialValues = new ContentValues();
    initialValues.put(KEY_TITLE, title);
    initialValues.put(KEY_BODY, body);
    initialValues.put(KEY_COLOR, color);
    initialValues.put(KEY_DATE, date);

    return mDb.insert(DATABASE_TABLE, null, initialValues);
}

public boolean deleteNote(long rowId) {

    return mDb.delete(DATABASE_TABLE, KEY_ROWID + "=" + rowId, null) > 0;
}


public Cursor fetchAllNotes() {

    return mDb.query(DATABASE_TABLE, new String[] {KEY_ROWID, KEY_TITLE,
            KEY_BODY, KEY_COLOR, KEY_DATE}, null, null, null, null, null);
}


public Cursor fetchNote(long rowId) throws SQLException {

    Cursor mCursor =

        mDb.query(true, DATABASE_TABLE, new String[] {KEY_ROWID,
                KEY_TITLE, KEY_BODY, KEY_COLOR, KEY_DATE}, KEY_ROWID + "=" + rowId, null,
                null, null, null, null);
    if (mCursor != null) {
        mCursor.moveToFirst();
    }
    return mCursor;

}


public boolean updateNote(long rowId, String title, String body, String color, String date) {
    ContentValues args = new ContentValues();
    args.put(KEY_TITLE, title);
    args.put(KEY_BODY, body);
    args.put(KEY_COLOR, color);
    args.put(KEY_DATE, date);

    return mDb.update(DATABASE_TABLE, args, KEY_ROWID + "=" + rowId, null) > 0;
}

}

更新 运行后好的，这是我得到的错误日志：

08-03 16:15:52.816: I/Process(29938): 发送信号。PID: 29938 SIG: 9 08-03 16:15:53.046: E/SQLiteLog(30048): (1) no such column: date 08-03 16:15:53.046: D/AndroidRuntime(30048): 关闭 VM 08 -03 16:15:53.046: W/dalvikvm(30048): threadid=1: 线程退出未捕获异常 (group=0x40d23a08) 08-03 16:15:53.056: E/AndroidRuntime(30048): 致命异常: main 08 -03 16:15:53.056：E/AndroidRuntime(30048)：java.lang.RuntimeException：无法启动活动 ComponentInfo{com.android.demo.notepad2/com.android.demo.notepad2.Notepadv2}：android.database。 sqlite.SQLiteException: no such column: date (code 1): , while compile: SELECT _id, title, body, color, date FROM notes 08-03 16:15:53.056: E/AndroidRuntime(30048): at android.app .ActivityThread.performLaunchActivity(ActivityThread.java:2312) 08-03 16:15:53.056: E/AndroidRuntime(30048):

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2 回答 2

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您的查询中有错误：用另一个名称更改date（以及）；_id通常日期是保留关键字。

于 2013-08-03T11:39:11.693 回答
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我会把它放在评论中，但我的代表还不够高。我很确定有一种方法可以让 SQL 表在创建新条目时自动放置当前日期和时间。也许你可以试试？自从我使用 SQL 以来已经有一段时间了，所以我可能是错的。

于 2013-08-03T10:58:18.183 回答