Android SQLite 列......不是唯一的

Question

我在 android 上使用 SQLite 并收到此错误

02-11 18:05:37.224: E/SQLiteDatabase(26583): android.database.sqlite.SQLiteConstraintException: columns name, foreign_word are not unique (code 19)

但是，它是在调用 onUpgrade() 之后立即调用的，因此数据库本身应该没有任何内容。这是使用的 SQL 语句：

private static final String CREATE_DB_TB_2 = "CREATE TABLE "
        + TABLE_VOCAB_WORDS + "(" + COLUMN_NAME + " TEXT NOT NULL,"
        + COLUMN_WORD_FOREIGN + " TEXT NOT NULL," + COLUMN_WORD_ENGLISH
        + " TEXT NOT NULL," + COLUMN_CORRECT
        + " BYTE NOT NULL, PRIMARY KEY (" + COLUMN_NAME + ","
        + COLUMN_WORD_FOREIGN + "))";

由于删除表时数据库中没有任何内容，为什么在添加内容时会出现错误？此外，我正在调用 context.deleteDatabase(NAME);每次我运行应用程序。这个东西必须是唯一的，因为表是空的！

提前致谢

完整的 LogCat：

02-11 18:38:02.811: E/SQLiteDatabase(28631): Error inserting correct=0 english_meaning= tener prisa foreign_word=to be in a hurry  name=AQA GCSE Spanish Higher
02-11 18:38:02.811: E/SQLiteDatabase(28631): android.database.sqlite.SQLiteConstraintException: columns name, foreign_word are not unique (code 19)
02-11 18:38:02.811: E/SQLiteDatabase(28631):    at android.database.sqlite.SQLiteConnection.nativeExecuteForLastInsertedRowId(Native Method)
02-11 18:38:02.811: E/SQLiteDatabase(28631):    at android.database.sqlite.SQLiteConnection.executeForLastInsertedRowId(SQLiteConnection.java:775)
02-11 18:38:02.811: E/SQLiteDatabase(28631):    at android.database.sqlite.SQLiteSession.executeForLastInsertedRowId(SQLiteSession.java:788)
02-11 18:38:02.811: E/SQLiteDatabase(28631):    at android.database.sqlite.SQLiteStatement.executeInsert(SQLiteStatement.java:86)
02-11 18:38:02.811: E/SQLiteDatabase(28631):    at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1525)
02-11 18:38:02.811: E/SQLiteDatabase(28631):    at android.database.sqlite.SQLiteDatabase.insert(SQLiteDatabase.java:1395)
02-11 18:38:02.811: E/SQLiteDatabase(28631):    at com.sharma.gcsevocabtester.DatabaseManipulator.addWord(DatabaseManipulator.java:168)
02-11 18:38:02.811: E/SQLiteDatabase(28631):    at com.sharma.gcsevocabtester.DatabaseManipulator$ImportVocabList.onPostExecute(DatabaseManipulator.java:420)
02-11 18:38:02.811: E/SQLiteDatabase(28631):    at com.sharma.gcsevocabtester.DatabaseManipulator$ImportVocabList.onPostExecute(DatabaseManipulator.java:1)
02-11 18:38:02.811: E/SQLiteDatabase(28631):    at android.os.AsyncTask.finish(AsyncTask.java:631)
02-11 18:38:02.811: E/SQLiteDatabase(28631):    at android.os.AsyncTask.access$600(AsyncTask.java:177)
02-11 18:38:02.811: E/SQLiteDatabase(28631):    at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644)
02-11 18:38:02.811: E/SQLiteDatabase(28631):    at android.os.Handler.dispatchMessage(Handler.java:99)
02-11 18:38:02.811: E/SQLiteDatabase(28631):    at android.os.Looper.loop(Looper.java:155)
02-11 18:38:02.811: E/SQLiteDatabase(28631):    at android.app.ActivityThread.main(ActivityThread.java:5454)
02-11 18:38:02.811: E/SQLiteDatabase(28631):    at java.lang.reflect.Method.invokeNative(Native Method)
02-11 18:38:02.811: E/SQLiteDatabase(28631):    at java.lang.reflect.Method.invoke(Method.java:511)
02-11 18:38:02.811: E/SQLiteDatabase(28631):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1029)
02-11 18:38:02.811: E/SQLiteDatabase(28631):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:796)
02-11 18:38:02.811: E/SQLiteDatabase(28631):    at dalvik.system.NativeStart.main(Native Method)

此外，我不确定这是否会有所作为，但我还有另一个使用此字符串创建的表。

private static final String CREATE_DB_TB_1 = "CREATE TABLE "
        + TABLE_VOCAB_INFO + "(" + COLUMN_NAME
        + " TEXT NOT NULL PRIMARY KEY," + COLUMN_URL + " TEXT NOT NULL,"
        + COLUMN_DOWNLOADED + " TEXT NOT NULL)";

ImportVocabList 是一个异步任务。这是 onPostExecute ：

**
     * Method called after execution has happen, passing in the result
     * 
     * @Override
     */
    protected void onPostExecute(ArrayList<Word> result) {
        super.onPostExecute(result);
        progressDialog.dismiss();
        boolean b = false;
        open();
        for (Word w : result) {

            addWord(w, vlName);
        }
        if (getAllVocabListsWhere(DatabaseManipulator.COLUMN_DOWNLOADED,
                "false").size() == 0) {
            b = true;
        }
        close();
        if (b) {
            context.finish();
        }
    }

addWord方法如下：

          public boolean addWord(Word w, String name) {
    try {
        ContentValues cv = new ContentValues();
        cv.put(COLUMN_NAME, name);
        cv.put(COLUMN_WORD_FOREIGN, w.getWordForeign());
        cv.put(COLUMN_WORD_ENGLISH, w.getWordEnglish());
        cv.put(COLUMN_CORRECT, w.getCorrect());
        database.insert(TABLE_VOCAB_WORDS, null, cv);
        return true;
    } catch (SQLiteException e) {
        System.out.println("SQL ERROR");
        return false;
    }
}

问题已解决 - 有重复的条目，但它们被忽略了。谢谢

Answer 1

查看您的 AsyncTask 的 onPostExecute() 方法，我相信您在 result 中至少有一组重复的值。只需从源中清除这些重复项即可。

或者您可以tell your table 忽略具有重复条目的行并通过"conflict-clause" 继续：

private static final String CREATE_DB_TB_2 = "CREATE TABLE "
        + TABLE_VOCAB_WORDS + "(" + COLUMN_NAME + " TEXT NOT NULL,"
        + COLUMN_WORD_FOREIGN + " TEXT NOT NULL," + COLUMN_WORD_ENGLISH
        + " TEXT NOT NULL," + COLUMN_CORRECT
        + " BYTE NOT NULL, PRIMARY KEY (" + COLUMN_NAME + ","
        + COLUMN_WORD_FOREIGN + ") ON CONFLICT IGNORE)";

Answer 2

name 和 foreign_word 构成此表中的主要（唯一！）键。您必须尝试插入重复的键控行。两个字段的组合必须是唯一的。

Answer 3

使用

db.insertOrThrow(TABLE_VOCAB_WORDS, null, cv);

由于我忽略的原因，它对我有用。