我试图在我的Android应用程序中在SQLite数据库中创建两个表，但它显示以下错误。基本上，我不会创建我尝试创建的第二个表。任何帮助，将不胜感激。
这是我得到的错误：
02-22 09:16:33.005 22404-22404/proed.hotelbooking E/SQLiteLog: (1) no such table: room 02-22 09:16:33.007 22404-22404/proed.hotelbooking
E/SQLiteDatabase: Error inserting room_id=1 room_price=1000 room_type=Single hotel_id=1
android.database.sqlite.SQLiteException: no such table: room (code 1): ,
while compiling: INSERT INTO room(room_id,room_price,room_type,hotel_id) VALUES (?,?,?,?)
at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889)
at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500)
at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31)
at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1472)
at android.database.sqlite.SQLiteDatabase.insert(SQLiteDatabase.java:1343)
at proed.hotelbooking.HotelDatabaseHelper.insertRoom(HotelDatabaseHelper.java:70)
at proed.hotelbooking.RoomInfoActivity.onRoomButtonClick(RoomInfoActivity.java:42)
at java.lang.reflect.Method.invoke(Native Method)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
at android.view.View.performClick(View.java:6256)
at android.view.View$PerformClick.run(View.java:24701)
at android.os.Handler.handleCallback(Handler.java:789)
at android.os.Handler.dispatchMessage(Handler.java:98)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
这是我的数据库助手类。我错过了什么吗？
public class HotelDatabaseHelper extends SQLiteOpenHelper {
private static int DATABASE_VERSION = 1;
private static final String DATABASE_NAME = "hotels";
private static final String TABLE_NAME = "hotel";
private static final String TABLE_ROOM = "room";
private static final String col_id = "id";
private static final String col_name = "hotelName";
private static final String col_location = "location";
private static final String room_id = "room_id";
private static final String room_type = "room_type";
private static final String room_price = "room_price";
private static final String hotel_id = "hotel_id";
private static final String hotel_table = "CREATE TABLE `hotel` ( `id` INTEGER primary key not null, `hotelName` VARCHAR not null, `location` VARCHAR not null )";
private static final String room_table ="CREATE TABLE `room` ( `room_id` INTEGER primary key not null, `room_type` VARCHAR not null, `room_price` VARCHAR not null, `hotel_id` VARCHAR not null )";
SQLiteDatabase db;
private static final String info = "DATABASE";
public HotelDatabaseHelper(Context context)
{
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(hotel_table);
db.execSQL(room_table);
Log.i(info, "Created!!!!!!!!!");
}
public void insertHotel(Hotels h)
{
db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(col_id, h.getId());
values.put(col_name, h.getHotelName());
values.put(col_location, h.getLocation());
db.insert(TABLE_NAME, null, values);
db.close();
}
public void insertRoom(Hotels hotel)
{
db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(room_id, hotel.getRoom_id());
values.put(room_price, hotel.getRoom_price());
values.put(room_type, hotel.getRoom_type());
values.put(hotel_id, hotel.getHotel_id());
db.insert(TABLE_ROOM, null, values);
db.close();
}
public Cursor getListContents()
{
db = this.getWritableDatabase();
Cursor data = db.rawQuery("SELECT * FROM " + TABLE_NAME, null);
return data;
}
@Override
public void onUpgrade(SQLiteDatabase sqLiteDatabase, int i, int i1) {
db.execSQL("DROP TABLE IF EXISTS "+TABLE_NAME);
db.execSQL("DROP TABLE IF EXISTS " + TABLE_ROOM);
onCreate(db);
}
}
这是我要插入数据的类：
public class RoomInfoActivity extends AppCompatActivity {
HotelDatabaseHelper helper = new HotelDatabaseHelper(this);
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_room_info);
}
public void onRoomButtonClick(View v)
{
if (v.getId()==R.id.addRoom) {
EditText id = findViewById(R.id.roomId);
EditText type = findViewById(R.id.roomType);
EditText price = findViewById(R.id.roomPrice);
EditText hotel_id = findViewById(R.id.hotelID);
String room_id = id.getText().toString();
String room_type = type.getText().toString();
String room_price = price.getText().toString();
String hotelID = hotel_id.getText().toString();
if (TextUtils.isEmpty(room_id) || TextUtils.isEmpty(room_type) || TextUtils.isEmpty(room_price) || TextUtils.isEmpty(hotelID)) {
Toast.makeText(this, "Please do not leave any field blank! ", Toast.LENGTH_SHORT).show();
return;
} else {
Hotels hotels = new Hotels();
hotels.setRoom_id(room_id);
hotels.setRoom_price(room_price);
hotels.setRoom_type(room_type);
hotels.setHotel_id(hotelID);
helper.insertRoom(hotels);
//Toast.makeText(this, "Data Added To The Database", Toast.LENGTH_SHORT).show();
}
}
}
public void onViewRoomButtonClick(View view)
{
if (view.getId()==R.id.viewRoom)
{
Intent intent = new Intent(RoomInfoActivity.this, ViewRoomContents.class);
startActivity(intent);
}
}
}
答案 0 :(得分：0)
如果您修改了数据库，例如添加/删除表/列，则需要 从模拟器/设备卸载应用程序，然后重新安装。
如果不起作用，只需转到File并点击Invalidate Caches/Restart
答案 1 :(得分：-1)
我已经检查了你的DatabaseHelper，它没有问题。 你能展示init数据库的代码并插入数据吗？ 也许问题来自最初的步骤。