Question

我一直在努力让listview在android studio中填充来自SQLite的数据。当用户单击按钮以查看酒店列表时，列表视图应该填充。但是，每次应用程序崩溃时，我都会收到相同的错误。

例外：

java.lang.RuntimeException：无法启动活动 ComponentInfo {com.example.aids.a09application / com.example.aids.a09application.HotelsList}： android.database.sqlite.SQLiteException：接近“to”：语法错误（代码 1）:,编译时：INSERT INTO酒店（hotel_id，hotel_name，电话，纬度，经度，价格，靠近）VALUES （1，'Curragh B＆amp; B'，'+ 35345456429'，53.124905，-6.789059，'A'，'Mondello 园'）;

以下是SQLHelper类的代码：

@Override
public void onCreate(SQLiteDatabase db) {
    String CREATE_HOTEL = "CREATE TABLE IF NOT EXISTS " + TABLE_HOTEL + "("
            + HOTEL_ID + " INTEGER PRIMARY KEY NOT NULL,"
            + HOTEL_NAME + " TEXT,"
            + PHONE + " TEXT," + LATITUDE + " REAL,"
            + LONGITUDE + " REAL," + PRICE + " TEXT,"
            + NEAR_TO + "TEXT" +");";
    db.execSQL(CREATE_HOTEL);
    db.execSQL(insertHotel(1,"Curragh B&B", "+35345456429", 53.124905, -6.789059, "A", "Mondello Park"));
    db.execSQL(insertHotel(2,"No. 5 Bed and Breakfast", "+353 1 708 6400", 53.130330, -6.755625, "A", "Mondello Park"));
    db.execSQL(insertHotel(3,"Maynooth Campus", "+353 85 110 0907", 53.379794, -6.595520, "A", "Mondello Park"));
    db.execSQL(insertHotel(4,"Tulloch","+353 45 531 988", 53.171297, -6.973274, "A", "Mondello Park"));
    db.execSQL(insertHotel(5,"Kilcullen Home Stay","+353 87 650 7195", 53.127930, -6.746819, "A", "Mondello Park"));
    db.execSQL(insertHotel(6,"Cherryville House B&B","+353 45 521 091", 53.155753,-6.963233, "A", "Mondello Park"));
    db.execSQL(insertHotel(7,"Athgarvan B&B","+353 45 405 950", 53.153120, -6.779494, "A", "Mondello Park"));
    db.execSQL(insertHotel(8,"Naas Court Hotel","+353 45 866 073", 53.216508, -6.664741, "A", "Mondello Park"));
    db.execSQL(insertHotel(9,"Gardeners Cottage","+353 86 817 4354", 53.371688, -6.715289, "A", "Mondello Park"));
    db.execSQL(insertHotel(10,"Bridge B&B","+353 45 881 891", 53.214835, -6.678269, "A", "Mondello Park"));

public String insertHotel(int hotelId, String hotelName, String phone, double latitude, double longitude, String price, String nearTo) {
    String insertHotelToDB = "INSERT INTO " + TABLE_HOTEL
            + " (" + HOTEL_ID + "," + HOTEL_NAME + "," + PHONE + "," + LATITUDE + "," + LONGITUDE + "," + PRICE + "," + NEAR_TO
            + ") VALUES (" + hotelId + ",'" + hotelName + "','" + phone + "'," + latitude + "," + longitude + ",'" + price + "','" + nearTo + "')" + ";";
    return insertHotelToDB;
}`

这是酒店列表类：

public class HotelsList extends AppCompatActivity {
ListView hotelList;
//SQLHelper db = new SQLHelper(this);
List<Hotel> getAllHotels;
ArrayAdapter adapter;
SQLHelper db = new SQLHelper(this);
@Override
public void onCreate (Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    setContentView(R.layout.hotel_list);
    hotelList = (ListView)findViewById(R.id.hotel_listView);
    getAllHotels = db.getAllHotels();
    db.close();

    // set up ArrayList for buildingNames
    final List<String> hotelNames = new ArrayList<>();

    // loop through getAllBuilding List and add all building_name 's to buildingNames list
    for (int i = 0; i < getAllHotels.size(); i++) {
        hotelNames.add(getAllHotels.get(i).getHotelName());
        //sort alphabetically
        Collections.sort(hotelNames);

    }
    // set up adapter for searchBar listView
    adapter = new ArrayAdapter<>(HotelsList.this, android.R.layout.simple_list_item_1, hotelNames);
    hotelList.setAdapter(adapter);
}

}

这是包含打开酒店列表按钮的片段：

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View view = inflater.inflate(R.layout.fragment_open_hotels, container, false);
    Button openHotel = (Button) view.findViewById(R.id.hotelsButton);
    openHotel.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intentOpenHotelPage = new Intent(getActivity(), HotelsList.class);
            startActivity(intentOpenHotelPage);
        }
    });
    return view;

}

Answer 1

您应该添加 SPACE ＆amp;移除 ;

<强>不

+ NEAR_TO + "TEXT" +");";

<强>不要

 + NEAR_TO + " TEXT" + ")";

然后卸载 App＆amp; RUN 。

Answer 2

在您的查询中执行此操作，

+ NEAR_TO + "TEXT" + ")";

您的代码+ NEAR_TO + "TEXT" +");"; - 错误

Answer 3

我建议稍微不同地插入数据库以避免语法相关的问题。 SQLiteDatabase类能够通过ContentValues执行基本的CRUD操作。一个简单的插入示例如下：

SQLiteDatabase database = this.getWritableDatabase();
ContentValues values = new ContentValues();

values.put(COLUMN_1, "your col 1 value here");
values.put(COLUMN_2, "your col 2 value here");
values.put(COLUMN_3, "your col 3 value here");
...

database.insert(TABLE_1, null, values);

通过遵循这样的结构，您不再需要以字符串形式生成查询并执行它们。这将使您的生活更轻松，您将遵守一般的SQLite指南，并使您的代码更具可读性。

另外作为另一个提示/旁注：我注意到你基本上使用数据库类的onCreate（）中的一些值初始化表。当我以前需要做类似的事情时，我创建了一个initTable（）函数，其中我遵循与上述相同的模式。但是请注意，插入必须在方法中多次出现以完成插入多行，因此该函数最终会看起来像这样：

private void initPeople(SQLiteDatabase db){

    ContentValues values = new ContentValues();

    values.put(FIRST_NAME, "Foo");
    values.put(LAST_NAME, "Bar");
    db.insert(TABLE_PEOPLE, null, values);

    values.put(FIRST_NAME, "John");
    values.put(LAST_NAME, "Smith");
    db.insert(TABLE_PEOPLE, null, values);
}

Android SQLite语法错误导致应用崩溃

3 个答案: