Question

有人可以帮我理解我做错了什么吗？我正在尝试向数据库添加一个事件，并在单击菜单项时将其打印出来。我有一个SQLite Helper，使用以下方法：

public void addEvent(Event ev){
    ContentValues contentValues = new ContentValues();
    contentValues.put(DatabaseHelper.TITLE, ev.getTitle());
    contentValues.put(DatabaseHelper.START_DATE, ev.getStartTime());
    contentValues.put(DatabaseHelper.END_DATE, ev.getEndTime());
    contentValues.put(DatabaseHelper.IMAGE_URL, ev.getImageURL());
    contentValues.put(DatabaseHelper.URL, ev.getUrl());
    contentValues.put(DatabaseHelper.SUBTITLE, ev.getSubtitle());
    contentValues.put(DatabaseHelper.DESCRIPTION, ev.getDescription());
    SQLiteDatabase db = getWritableDatabase();
    db.insert(TABLE_NAME, null, contentValues);
    db.close();
}

这是我创建事件的地方，将其添加到数据库并打印出来：

public boolean onOptionsItemSelected(MenuItem item) {

    if (item.getTitle().equals("Sort by name")){
        EventsListFragment.sort(-1);
    }else if (item.getTitle().equals("Sort by date")) {
        EventsListFragment.sort(1);
    }else if (item.getTitle().equals("Stored events")){
        Event event = new Event("AURORA", "Mon 23.25.2016 at 15:30:00", "Mon 23.25.2016 at 16:30:00", "g", "g", "g", "g");
        eventsDB.addEvent(event);
        printDatabase();
    }
    return true;
}

然后我得到了这个我无法理解的错误。

05-24 23:02:01.068 2453-2453/com.example.aurora.eventsapp E/SQLiteLog: (1) near "date": syntax error
05-24 23:02:01.068 2453-2453/com.example.aurora.eventsapp E/SQLiteDatabase: Error inserting Subtitle=g Image=g Description=g Title=AURORA End date=End: Mon 23.25.2016 at 16:30:00 URL=g Start date=Start: Mon 23.25.2016 at 15:30:00
                                                                            android.database.sqlite.SQLiteException: near "date": syntax error (code 1): , while compiling: INSERT INTO stored_events_table(Subtitle,Image,Description,Title,End date,URL,Start date) VALUES (?,?,?,?,?,?,?)
                                                                            #################################################################
                                                                            Error Code : 1 (SQLITE_ERROR)
                                                                            Caused By : SQL(query) error or missing database.

=================== UPDATE ===========================

public class DatabaseHelper extends SQLiteOpenHelper {
 private static final int DATABASE_VERSION = 2;
 public static final String DATABASE_NAME = "storedevents.db";
 public static final String TABLE_NAME = "stored_events_table";

 public static final String ID = "_id";
 public static final String TITLE = "Title";
 public static final String START_DATE = "StartDate";
 public static final String END_DATE = "EndDate";
 public static final String IMAGE_URL = "Image";
  public static final String URL = "URL";
 public static final String SUBTITLE = "Subtitle";
 public static final String DESCRIPTION = "Description";

public static final String[] ALL_COLUMNS = new String[] {ID, TITLE, START_DATE, END_DATE, IMAGE_URL, URL, SUBTITLE, DESCRIPTION};
public static final String[] LIST_COLUMNS = new String[] {TITLE, START_DATE, END_DATE, IMAGE_URL, URL, SUBTITLE, DESCRIPTION};

public static String[] stringArray(long id) {
    return new String[] {Long.toString(id)};
}

private static final String CREATE_TABLE = "create table " + TABLE_NAME + "(" +
        ID + " INTEGER PRIMARY KEY AUTOINCREMENT " +
        TITLE + " text not null " +
        START_DATE + " text not null " +
        END_DATE + " text not null " +
        IMAGE_URL + " text " +
        URL + " text " +
        SUBTITLE + " text " +
        DESCRIPTION + " text);";

public DatabaseHelper(Context context) {
    super(context, DATABASE_NAME, null, DATABASE_VERSION);
}

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

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

//Add new row to the database
public void addEvent(Event ev){
    ContentValues contentValues = new ContentValues();
    contentValues.put(DatabaseHelper.TITLE, ev.getTitle());
    contentValues.put(DatabaseHelper.START_DATE, ev.getStartTime());
    contentValues.put(DatabaseHelper.END_DATE, ev.getEndTime());
    contentValues.put(DatabaseHelper.IMAGE_URL, ev.getImageURL());
    contentValues.put(DatabaseHelper.URL, ev.getUrl());
    contentValues.put(DatabaseHelper.SUBTITLE, ev.getSubtitle());
    contentValues.put(DatabaseHelper.DESCRIPTION, ev.getDescription());
    SQLiteDatabase db = getWritableDatabase();
    db.insert(TABLE_NAME, null, contentValues);
    db.close();
}

//Delete event from database
public void deleteEvent(String eventTitle){
    SQLiteDatabase db = getWritableDatabase();
    db.execSQL("DELETE FROM " + TABLE_NAME + "WHERE " + TITLE + "=\"" + eventTitle + "\";" );
}

//Print the database as string
public String databaseToString(){
    String dbString="";
    SQLiteDatabase db = getWritableDatabase();
    String query = "SELECT * FROM " + TABLE_NAME + " WHERE 1";

    //points to a location in results
    Cursor c = db.rawQuery(query, null);
    c.moveToFirst();

    while (!c.isAfterLast()){
        if(c.getString(c.getColumnIndex("Title")) != null){
            dbString += c.getString(c.getColumnIndex("Title"));
            dbString += "\n";
        }
    }
    db.close();
    return dbString;
}

}

Answer 1

正如我所看到的，语句中有一个SQL错误

INSERT INTO stored_events_table(Subtitle,Image,Description,Title,End date,URL,Start date)
       VALUES ...

列名不能包含空格符号 - 请检查您定义\构造SQL状态的代码\常量。

SQLite错误，缺少数据库......我无法理解错误

1 个答案: