Android SQLite Exception没有这样的列

Question

我在Android应用中的数据库有问题。这是一些代码：

private static final String QUESTIONS_TABLE = "questions";
/* questions keys */
public static final String KEY_ROWID = "_id";
public static final String KEY_TYPE = "type";
public static final String KEY_CONTENT = "content";
public static final String KEY_A = "answerA";
public static final String KEY_B = "answerB";
public static final String KEY_C = "answerC";
public static final String KEY_D = "answerD";

private static final String QUESTIONS_TABLE_CREATE = 
    "create table "+ QUESTIONS_TABLE +" (" + KEY_ROWID + " integer primary key autoincrement, "
    + KEY_TYPE + "integer not null,"
    + KEY_CONTENT + " text not null, "
    + KEY_A + " text, "
    + KEY_B + "text, "
    + KEY_C + "text, "
    + KEY_D + "text); ";

//--- QUESTIONS SECTION ---
//--- inserts a close question ---
public long insertCloseQuestion(int type, String content, String[] answers) {
    ContentValues initValues = new ContentValues();
    initValues.put(KEY_TYPE, type);
    initValues.put(KEY_CONTENT, content);
    if(answers != null && answers.length > 0) {
        initValues.put(KEY_A, answers[0]);
        initValues.put(KEY_B, answers[1]);
        initValues.put(KEY_C, answers[2]);
        initValues.put(KEY_D, answers[3]);
    }
    Log.d("VM", initValues.toString());

    return db.insertOrThrow(QUESTIONS_TABLE, null, initValues);
}

当我调用insertCloseQuestion方法时，Android返回一个异常：

android.database.sqlite.SQLiteException: table questions has no column named answerD: , while compiling: INSERT INTO questions(answerD, content, answerB, answerC, type, answerA) VALUES(?, ?, ?, ?, ?, ?);

您有任何解决方法的想法吗？我知道有几个这样的主题，但是没有一个解决方案对我有帮助。

Answer 1

private static final String QUESTIONS_TABLE_CREATE = 
    "create table "+ QUESTIONS_TABLE +" (" + KEY_ROWID + " integer primary key autoincrement, "
    + KEY_TYPE + "integer not null,"
    + KEY_CONTENT + " text not null, "
    + KEY_A + " text, "
    + KEY_B + "text, "
    + KEY_C + "text, "
    + KEY_D + "text); ";

我猜列名和它的类型之间没有空格。KEY_B + "text, "在文本之前（此处和其他列）放置一个空格。

并且不要忘记在那之后删除数据库（从手机中卸载应用程序）！