SQLite Ausnahme von DELETE *

Question

Ich habe diese SQL-Anweisung, die ich ausführen will:

db.execSQL("DELETE * FROM " + TABLE_NAME + " WHERE " + DATE_TO_REMIND + "='" + date + "'"); 

Wo TABLE_NAME und DATE_TO_REMIND sind Spaltennamen und das Datum ist eine Zeichenkette in eine Methode übergeben.

Wenn ich es wurden heute läuft, sollte es übersetzen zu:

"DELETE * FROM Vocabulary WHERE dateToRemind ='2016/03/28'" 

Dieser Fehler in der logcat, die auf die * Punkt werfen, aber ich kann nicht verstehen, was diese Aussage fehlerhaft ist. Hier ist der Fehler:

java.lang.RuntimeException: Unable to start activity ComponentInfo{nuffsaidm8.me.activeenglish/nuffsaidm8.me.activeenglish.CheckVocabActivity}: android.database.sqlite.SQLiteException: near "*": syntax error (code 1): , while compiling: DELETE * FROM Vocabulary WHERE Date_To_Remind='2016/03/28' 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: near "*": syntax error (code 1): , while compiling: DELETE * FROM Vocabulary WHERE Date_To_Remind='2016/03/28' 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.SQLiteStatement.(SQLiteStatement.java:31) at android.database.sqlite.SQLiteDatabase.executeSql(SQLiteDatabase.java:1674) at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1605) at nuffsaidm8.me.activeenglish.DBHelper.getWordsToReview(DBHelper.java:77) at nuffsaidm8.me.activeenglish.CheckVocabActivity.onCreate(CheckVocabActivity.java:55) at android.app.Activity.performCreate(Activity.java:6251) 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) 

Das Merkwürdige an dieser Aussage ist, dass ich eine sehr ähnliche Anweisung verwendet (ich nur die ursprüngliche Mitteilung kopiert und geändert wählen zu löschen), um alle Zeilen auszuwählen, die diese Qualifikationen passen:

Cursor cursor = db.rawQuery("SELECT * FROM " + TABLE_NAME + " WHERE " + DATE_TO_REMIND + "='" + date + "'", null); 

Nur für den Fall, werde ich den Rest der Klasse schreiben (obwohl ich bezweifle es von großem nutzen sein wird):

public class DBHelper extends SQLiteOpenHelper { 

private static final int DATABASE_VERSION = 1; 
private static final String DATABASE_NAME = "vocab.db"; 
public static final String VOCAB_INPUT = "Input_Word"; 
public static final String VOCAB_TRANSLATION = "Translation"; 
public static final String DATE_TO_REMIND = "Date_To_Remind"; 
public static final String TABLE_NAME = "Vocabulary"; 
public static final String CURRENT_DAY_WAIT = "Current_Day_Wait"; 

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

@Override 
public void onCreate(SQLiteDatabase db) { 
    String query = "CREATE TABLE " + TABLE_NAME + "(" 
      + VOCAB_INPUT + " TEXT, " 
      + VOCAB_TRANSLATION + " TEXT, " 
      + DATE_TO_REMIND + " TEXT, " 
      + CURRENT_DAY_WAIT + " TEXT" 
      + ");"; 
    db.execSQL(query); 
} 

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

public void addWord(Word word) { 
    ContentValues values = new ContentValues(); 
    values.put(VOCAB_INPUT, word.getWord()); 
    values.put(VOCAB_TRANSLATION, word.getTranslation()); 
    values.put(DATE_TO_REMIND, word.getDate()); 
    values.put(CURRENT_DAY_WAIT, word.getDayWait()); 
    SQLiteDatabase db = getWritableDatabase(); 
    db.insert(TABLE_NAME, null, values); 
    db.close(); 
} 

public void deleteWord(Word word) { 
    SQLiteDatabase db = getWritableDatabase(); 
    db.execSQL("DELETE FROM " + TABLE_NAME + " WHERE " + VOCAB_INPUT + "=\"" + word.getWord() + "\""); 
} 

public List<Word> getWordsToReview(String date) { 
    List<Word> returnWords = new ArrayList<>(); 
    SQLiteDatabase db = getReadableDatabase(); 
    Cursor cursor = db.rawQuery("SELECT * FROM " + TABLE_NAME + " WHERE " + DATE_TO_REMIND + "='" + date + "'", null); 
    while (cursor.moveToNext()) { 
     String retrievedName = cursor.getString(cursor.getColumnIndex(VOCAB_INPUT)); 
     String retrievedTranslation = cursor.getString(cursor.getColumnIndex(VOCAB_TRANSLATION)); 
     String retrievedDate = cursor.getString(cursor.getColumnIndex(DATE_TO_REMIND)); 
     String currentDayWait = cursor.getString(cursor.getColumnIndex(CURRENT_DAY_WAIT)); 
     Word tempWord = new Word(retrievedName, retrievedTranslation, retrievedDate, currentDayWait); 
     returnWords.add(tempWord); 
    } 
    cursor.close(); 
    db.execSQL("DELETE * FROM " + TABLE_NAME + " WHERE " + DATE_TO_REMIND + "='" + date + "'"); 
    return returnWords; 
} 

public boolean doesWordExist(Word word) { 
    SQLiteDatabase db = getReadableDatabase(); 
    Cursor cursor = db.rawQuery("SELECT * FROM " + TABLE_NAME + " WHERE " + VOCAB_INPUT + "='" + word.getWord() + "'", null); 
    boolean exists = false; 
    while (cursor.moveToNext()) { 
     String retrievedName = cursor.getString(cursor.getColumnIndex(VOCAB_INPUT)); 
     if (retrievedName.equalsIgnoreCase(word.getWord())) { 
      exists = true; 
      break; 
     } 
    } 
    cursor.close(); 
    return exists; 
} 
} 

Answer 1

Versuchen Sie diese, nur * aus Ihrer Aussage entfernen:

db.execSQL("DELETE FROM " + TABLE_NAME + " WHERE " + DATE_TO_REMIND + "='" + date + "'"); 

Answer 2

entfernen * von Abfrage :

DELETE FROM Vocabulary WHERE dateToRemind ='2016/03/28'

Korrekter Code: bei the syntax of a DELETE statement

db.execSQL("DELETE FROM " + TABLE_NAME + " WHERE " + DATE_TO_REMIND + "='" + date + "'");

SQL DELETE Statement

Answer 3

...

Nur am

DELETE FROM table_name 
WHERE [condition]; 

Sie können nicht * alles, also entferne es.