SQLite Can't insert more than one records

i have 3 classes. DatabaseHandler, DatabaseController and addItem. I can insert one record, but if i want to insert 2 record, it just inserts the first one.

DatabaseHandler

public class DatabaseHandler extends SQLiteOpenHelper {

private static final String DATABASE_NAME = "entrys.db";
private final static int DATABASE_VERSION = 1;

public final static String ENTRY_TABLE = "poolentrys";
public final static String ENTRY_ID = "_id";
public final static String ENTRY_NAME = "name";
public final static String ENTRY_API = "api";

private static final String createDB = "create table "
        + ENTRY_TABLE + "(" 
        + ENTRY_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
        + ENTRY_NAME + " TEXT NOT NULL, "
        + ENTRY_API + " TEXT NOT NULL);";

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

public void onCreate(SQLiteDatabase db) {
    db.execSQL(createDB);
}

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

DatabaseController

public class DatabaseController {

private DatabaseHandler dbhandler;
private Context ourcontext;
private SQLiteDatabase database;

public DatabaseController(Context c) {
    ourcontext = c;
}

public DatabaseController open() throws SQLException {
    dbhandler = new DatabaseHandler(ourcontext);
    database = dbhandler.getWritableDatabase();
    return this;

}

public void close() {
    dbhandler.close();
}

//Inserting Data into table
public void insertData(String name, String api) {
    ContentValues cv = new ContentValues();
    cv.put(DatabaseHandler.ENTRY_NAME, name);
    cv.put(DatabaseHandler.ENTRY_API, api);
    database.insert(DatabaseHandler.ENTRY_TABLE, null, cv);
}

//some other classes, irrelevant for insert
//...
//...}

addItem

public class addItem extends Activity implements View.OnClickListener {

EditText poolName, poolApi;
Button poolSave;
DatabaseController dbcon;

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_additem);
    poolName = (EditText) this.findViewById(R.id.poolName);
    poolApi = (EditText) this.findViewById(R.id.poolApi);
    poolSave = (Button) this.findViewById(R.id.poolSave);

    dbcon = new DatabaseController(this);
    dbcon.open();
    poolSave.setOnClickListener(this);
}

@Override
public void onClick(View v) {
    switch (v.getId()) {
        case R.id.poolSave:
            if(poolName.getText().toString().trim().length()==0||
                    poolApi.getText().toString().trim().length()==0)
            {
                Toast.makeText(getApplicationContext(), "Fehler: Alle Felder müssen ausgefüllt sein!",
                        Toast.LENGTH_LONG).show();
                return;
            }
            String name = poolName.getText().toString();
            String api = poolApi.getText().toString();
            dbcon.insertData(name, api);
            Intent main = new Intent(this, MainActivity.class);
            startActivity(main);
            break;

        default:
            break;
    }
}}

Just found other people who also had this error, but their solutions didn't helped me.