我有一些数据要写入数据库(三个字符串);我有一个私有类 DBHelper 扩展 SQLiteOpenHelper 并且我有dataBase = dbHelper.getWritableDatabase(); 当我执行 dataBase.insert() 时,我有一个 nullPointerException。
我在调试器中检查了我的数据以进行写入,它们不等于 null;
数据库助手:
private class DBHelper extends SQLiteOpenHelper { //for write and read data from DB
static final String GROUPPS = "groupps";
static final String IMPORTANCE = "importance";
static final String NAME_OF_TABLE = "Person";
static final String PERSON_KEY = "perskey";
private static final String MY_QUERY = "CREATE TABLE " + NAME_OF_TABLE + " ( " +
PERSON_KEY + " TEXT, " +
GROUPPPS + " TEXT, " +
IMPORTANCE + " TEXT);";
public DBHelper(Context context) {
// constructor of superclass
super(context, "MyDBB", null, 2);
}
@Override
public void onCreate(SQLiteDatabase db) {
Log.d("", "--- onCreate database ---");
db.execSQL(MY_QUERY);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
}
我在数据库上写入数据的方法:
public void writeDataToDB(ArrayList<Person> arrayList) {
contentValues = new ContentValues();
dbHelper = new DBHelper(activity.getApplicationContext());
dataBase = dbHelper.getWritableDatabase();
for (int i = 0; i < arrayList.size(); i++) {
contentValues.put(PERSON_KEY, arrayList.get(i).getKey());
contentValues.put(GROUPPPS, arrayList.get(i).getGroup());
contentValues.put(IMPORTANCE, String.valueOf(arrayList.get(i).isImportant()));
Log.e("writeDataToDB", "Start inserting " + contentValues.toString());
long rowID = dataBase.insert(NAME_OF_TABLE, null, contentValues);
Log.e("writeDataToDB - ", "Value inserted, rowID = " + rowID);
contentValues.clear();
}
}
在我的方法中,我在行有异常: long rowID = dataBase.insert(NAME_OF_TABLE, null, contentValues);
和 rowID = -1 这意味着 - 东西不对;
和我的 LogCat:
Error inserting groupp=Withoutgroup importance=false perskey=0r2-2B43414D272B4D16
android.database.sqlite.SQLiteException: table Persons has no column named groupp: , while compiling: INSERT INTO Persons(groupp,importance,perskey) VALUES (?,?,?)