Ошибка при создании базы данных в студии android

Question

Я пытаюсь создать базу данных SQLite в студии Android, но я получил ошибку ниже, я начинаю студию андроид, и мне потребовалось очень много времени, чтобы найти решение.

Ошибка:

E/SQLiteLog: (1) near "_ItemName": syntax error 
D/AndroidRuntime: Shutting down VM 
E/AndroidRuntime: FATAL EXCEPTION: main 
        Process: iq.nazaha.wissam.CoiApp, PID: 3786 
        java.lang.RuntimeException: Unable to start activity ComponentInfo{iq.nazaha.wissam.CoiApp/iq.nazaha.wissam.CoiApp.AddNewItemPage}: android.database.sqlite.SQLiteException: near "_ItemName": syntax error (code 1): , while compiling: CREATE TABLE items(_id INTEGER PRIMARY KEY _ItemName TEXT _ItemLocation TEXT _ItemPerson TEXT); 
         at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2646) 
         at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2707) 
         at android.app.ActivityThread.-wrap12(ActivityThread.java) 
         at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460) 
         at android.os.Handler.dispatchMessage(Handler.java:102) 
         at android.os.Looper.loop(Looper.java:154) 
         at android.app.ActivityThread.main(ActivityThread.java:6077) 
         at java.lang.reflect.Method.invoke(Native Method) 
         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865) 
         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755) 
        Caused by: android.database.sqlite.SQLiteException: near "_ItemName": syntax error (code 1): , while compiling: CREATE TABLE items(_id INTEGER PRIMARY KEY _ItemName TEXT _ItemLocation TEXT _ItemPerson TEXT); 
         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.executeSql(SQLiteDatabase.java:1677) 
         at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1608) 
         at iq.nazaha.wissam.CoiApp.AppDB.onCreate(AppDB.java:32) 
         at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:251) 
         at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:163) 
         at iq.nazaha.wissam.CoiApp.AppDB.dbToString(AppDB.java:65) 
         at iq.nazaha.wissam.CoiApp.AddNewItemPage.printDB(AddNewItemPage.java:52) 
         at iq.nazaha.wissam.CoiApp.AddNewItemPage.onCreate(AddNewItemPage.java:32) 
         at android.app.Activity.performCreate(Activity.java:6662) 
         at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118) 
         at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2599) 
         at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2707)  
         at android.app.ActivityThread.-wrap12(ActivityThread.java)  
         at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460)  
         at android.os.Handler.dispatchMessage(Handler.java:102)  
         at android.os.Looper.loop(Looper.java:154)  
         at android.app.ActivityThread.main(ActivityThread.java:6077)  
         at java.lang.reflect.Method.invoke(Native Method)  
         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)  
         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755) 

И мой DB код обработчик:

import android.database.sqlite.SQLiteDatabase; 
import android.database.sqlite.SQLiteOpenHelper; 
import android.database.Cursor; 
import android.content.Context; 
import android.content.ContentValues; 


public class AppDB extends SQLiteOpenHelper { 

    private static final int DATABASE_VERSION = 1; 
    private static final String DATABASE_NAME = "items.db"; 
    private static final String TABLE_ITEMSINFO = "items"; 
    public static final String COLUMN_ITEMID = "_id"; 
    public static final String COLUMN_ITEMNAME = "_ItemName"; 
    public static final String COLUMN_ITEMLOCATION = "_ItemLocation"; 
    public static final String COLUMN_ITEMPERSON = "_ItemPerson"; 

    public AppDB(Context context, String name, SQLiteDatabase.CursorFactory factory, int version) { 
     super(context, DATABASE_NAME, factory, DATABASE_VERSION); 
    } 

    @Override 
    public void onCreate(SQLiteDatabase db) { 
     String query = " CREATE TABLE " + TABLE_ITEMSINFO + "(" + 
       COLUMN_ITEMID + " INTEGER PRIMARY KEY " + 
       COLUMN_ITEMNAME + " TEXT " + 
       COLUMN_ITEMLOCATION + " TEXT " + 
       COLUMN_ITEMPERSON + " TEXT " + 
       "); "; 
     db.execSQL(query); 
    } 

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

    // Add to the database 
    public void AddItems(ItemsInfo itemsinfo){ 
     ContentValues values = new ContentValues(); 
     values.put(COLUMN_ITEMID, itemsinfo.get_id()); 
     values.put(COLUMN_ITEMNAME, itemsinfo.get_ItemName()); 
     values.put(COLUMN_ITEMLOCATION, itemsinfo.get_ItemLocation()); 
     values.put(COLUMN_ITEMPERSON, itemsinfo.get_ItemPerson()); 
     SQLiteDatabase db = getWritableDatabase(); 
     db.insert(TABLE_ITEMSINFO, null, values); 
     db.close(); 

    } 

    // Delete from the database 
    public void DeleteItems(String ItemId){ 
     SQLiteDatabase db = getWritableDatabase(); 
     db.execSQL(" DELETE FROM " + TABLE_ITEMSINFO + " WHERE " + COLUMN_ITEMID + "=\"" + ItemId + "\";"); 
     db.close(); 

    } 

    // Print the database 
    public String dbToString(){ 
     String dbString = ""; 
     SQLiteDatabase db = getWritableDatabase(); 
     String query = " SELECT * FROM " + TABLE_ITEMSINFO + " WHERE 1"; 

     //CURSOR point to a location tn the database 
     Cursor c = db.rawQuery(query,null); 
     c.moveToFirst(); 
     while (!c.isAfterLast()){ 
      if (c.getString(c.getColumnIndex("itemname"))!= null){ 
       dbString += c.getString(c.getColumnIndex("itemname")); 
       dbString += "\n"; 
      } 
     } 
     db.close(); 
     return dbString; 

Большое спасибо за вашу помощь.

Answer 1

В a CREATE TABLE statement столбцы разделены столбцами.

Заменить:

String query = " CREATE TABLE " + TABLE_ITEMSINFO + "(" + 
      COLUMN_ITEMID + " INTEGER PRIMARY KEY " + 
      COLUMN_ITEMNAME + " TEXT " + 
      COLUMN_ITEMLOCATION + " TEXT " + 
      COLUMN_ITEMPERSON + " TEXT " + 
      "); "; 

с:

String query = " CREATE TABLE " + TABLE_ITEMSINFO + "(" + 
      COLUMN_ITEMID + " INTEGER PRIMARY KEY, " + 
      COLUMN_ITEMNAME + " TEXT, " + 
      COLUMN_ITEMLOCATION + " TEXT, " + 
      COLUMN_ITEMPERSON + " TEXT " + 
      "); "; 

Answer 2

Вы забыли добавить commas ваш запрос

String query = " CREATE TABLE " + TABLE_ITEMSINFO + "(" + 
      COLUMN_ITEMID + " INTEGER PRIMARY KEY, " + 
      COLUMN_ITEMNAME + " TEXT, " + 
      COLUMN_ITEMLOCATION + " TEXT, " + 
      COLUMN_ITEMPERSON + " TEXT " + 
      "); "; 

db.execSQL(query);