Fehler beim Speichern des Produkts in der Datenbank

Question

Beim Speichern oder Hinzufügen eines neuen Produkts in der Inventar-App habe ich einen Fehler beim Speichern der Datenbank.Ich denke, es ist etwas mit der Menge zu tun, aber ich bin mir nicht sicher, wie zu lösen it.It sagt Syntaxfehler Ich kann es einfach nicht herausfinden.Erstes war es nicht die Datenbank zu erkennen, wie es falsch war, aber nach der Änderung es richtig funktioniert es immer noch nicht.

EditorActivity.java

package com.example.bahubali.inventoryapp; 

import android.content.ContentValues; 
import android.database.sqlite.SQLiteDatabase; 
import android.os.Bundle; 
import android.support.v4.app.NavUtils; 
import android.support.v7.app.AppCompatActivity; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.widget.ArrayAdapter; 
import android.widget.EditText; 
import android.widget.Spinner; 
import android.widget.Toast; 

import com.example.bahubali.inventoryapp.data.ProductContract; 
import com.example.bahubali.inventoryapp.data.ProductDbHelper; 

import java.util.ArrayList; 
import java.util.List; 

public class EditorActivity extends AppCompatActivity { 

    /*Edit text field to enter the product name*/ 
    private EditText mNameEditText; 

    /*Edit text field to enter the product price*/ 
    private EditText mPriceEditText; 

    /*Edit text field to enter the product quantity*/ 
    private Spinner mQuantitySpinner; 

    /*Edit text field to enter the name of the supplier*/ 
    private EditText mSupplierText; 

    /*Quantity of the product is varying so the default value of the product*/ 

    private int mQuantity; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_editor); 

     //Find all the relevant views that we will need to read the input from 
     mNameEditText = (EditText)findViewById(R.id.edit_text_name); 
     mPriceEditText = (EditText) findViewById(R.id.edit_text_price); 

     mSupplierText = (EditText) findViewById(R.id.edit_text_supplier); 
     mQuantitySpinner =(Spinner) findViewById(R.id.spinner_quantity); 
     List<Integer> list = new ArrayList<Integer>(); 
     list.add(1); 
     list.add(2); 
     list.add(3); 
     list.add(4); 
     list.add(5); 
     list.add(6); 
     list.add(7); 
     ArrayAdapter<Integer> quantitySpinnnerAdapter = new ArrayAdapter<Integer>(this, 
       R.layout.support_simple_spinner_dropdown_item,list); 
     mQuantitySpinner.setAdapter(quantitySpinnnerAdapter); 


    } 

    /** 
    * Get user input from editor and save new pet into database. 
    */ 
    private void insertProduct(){ 
     // Read from input fields 
     // Use trim to eliminate leading or trailing white space 
     String productNameString = mNameEditText.getText().toString().trim(); 
     String productPriceString = mPriceEditText.getText().toString().trim(); 
     String productSupplierString = mSupplierText.getText().toString().trim(); 
     int price = Integer.parseInt(productPriceString); 

     //Create database helper 
     ProductDbHelper productDbHelper = new ProductDbHelper(this); 

     //Get the database in the write mode 
     SQLiteDatabase db = productDbHelper.getWritableDatabase(); 

     // Create a ContentValues object where column names are the keys, 
     // and pet attributes from the editor are the values. 
     ContentValues contentValues = new ContentValues(); 
     contentValues.put(ProductContract.ProductEntry.COLUMN_PRODUCT_NAME,productNameString); 
     contentValues.put(ProductContract.ProductEntry.COLUMN_PRODUCT_PRICE,price); 
     contentValues.put(String.valueOf(ProductContract.ProductEntry.COLUMN_PRODUCT_QUANTITY),mQuantity); 
     contentValues.put(ProductContract.ProductEntry.COLUMN_PRODUCT_SUPPLIER,productSupplierString); 


     //Insert a new row for the product in the database,returning ID of that new row 
     long newRowId = db.insert(ProductContract.ProductEntry.TABLE_NAME,null,contentValues); 

     // Show a toast message depending on whether or not the insertion was successful 
     if (newRowId == -1) { 
      // If the row ID is -1, then there was an error with insertion. 
      Toast.makeText(this, "Error with saving product", Toast.LENGTH_SHORT).show(); 
     } else { 
      // Otherwise, the insertion was successful and we can display a toast with the row ID. 
      Toast.makeText(this, "Product saved with row id: " + newRowId, Toast.LENGTH_SHORT).show(); 
     } 



    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu options from the res/menu/menu_editor.xml file. 
     // This adds menu items to the app bar. 
     getMenuInflater().inflate(R.menu.menu_editor, menu); 
     return true; 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     // User clicked on a menu option in the app bar overflow menu 
     switch (item.getItemId()){ 
      // Respond to a click on the "Save" menu option 
      case R.id.action_save: 
       insertProduct(); 
       finish(); 
       return true; 
      case R.id.action_delete: 
       // Do nothing for now 
       return true; 
      // Respond to a click on the "Up" arrow button in the app bar 
      case android.R.id.home: 
       // Navigate back to parent activity (CatalogActivity) 
       NavUtils.navigateUpFromSameTask(this); 
       return true; 
     } 
     return super.onOptionsItemSelected(item); 
    } 
} 

LogCat:

10-11 11:41:21.256 5125-5125/com.example.bahubali.inventoryapp E/SQLiteDatabase: Error inserting Product name=Rwf Price=100 Supplier=Fdg Quantity=0 
                       android.database.sqlite.SQLiteException: near "name": syntax error (code 1): , while compiling: INSERT INTO inventory(Product name,Price,Supplier,Quantity) VALUES (?,?,?,?) 
                        at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method) 
                        at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:887) 
                        at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:498) 
                        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:1469) 
                        at android.database.sqlite.SQLiteDatabase.insert(SQLiteDatabase.java:1341) 
                        at com.example.bahubali.inventoryapp.EditorActivity.insertProduct(EditorActivity.java:92) 
                        at com.example.bahubali.inventoryapp.EditorActivity.onOptionsItemSelected(EditorActivity.java:121) 
                        at android.app.Activity.onMenuItemSelected(Activity.java:2918) 
                        at android.support.v4.app.FragmentActivity.onMenuItemSelected(FragmentActivity.java:368) 
                        at android.support.v7.app.AppCompatActivity.onMenuItemSelected(AppCompatActivity.java:195) 
                        at android.support.v7.view.WindowCallbackWrapper.onMenuItemSelected(WindowCallbackWrapper.java:108) 
                        at android.support.v7.app.AppCompatDelegateImplV9.onMenuItemSelected(AppCompatDelegateImplV9.java:674) 
                        at android.support.v7.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:822) 
                        at android.support.v7.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:171) 
                        at android.support.v7.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:973) 
                        at android.support.v7.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:963) 
                        at android.support.v7.widget.ActionMenuView.invokeItem(ActionMenuView.java:624) 
                        at android.support.v7.view.menu.ActionMenuItemView.onClick(ActionMenuItemView.java:150) 
                        at android.view.View.performClick(View.java:5207) 
                        at android.view.View$PerformClick.run(View.java:21168) 
                        at android.os.Handler.handleCallback(Handler.java:746) 
                        at android.os.Handler.dispatchMessage(Handler.java:95) 
                        at android.os.Looper.loop(Looper.java:148) 
                        at android.app.ActivityThread.main(ActivityThread.java:5443) 
                        at java.lang.reflect.Method.invoke(Native Method) 
                        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728) 
                        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 

Answer 1

nicht sicher, wie Sie Ihre Daten sammeln alle meine Strings Variablen in einer Modellklasse leben dieser Teil des MVC-Design-Konzept ist. Ich werde versuchen, einen Link aufzunehmen Es scheint, Sie haben dieses Design nicht und ich bin mir nicht sicher, dass Sie eine DBHelper-Klasse erstellt haben Sobald Sie tun, ist die Verwaltung einer DB so einfach Hier ist Code, der in einer Aktivität mit einem SAVE lebt Taste und eine Reihe von EditText Felder namens etQuestion ect also, wenn Sie hier, um diese große One Kuriosität versuchen will ich String-Variable so haben die Tabelle zu nennen ware von, die wirklich sehen MVC Design

MVC Link

private void addListenerOnButtonSave() { 
    btnSave.setOnClickListener(new View.OnClickListener() { 

     @Override 
     public void onClick(View view) { 

      // 1. get reference to writable DB 
      db = dbHelper.getWritableDatabase(); 

      // 2. create ContentValues to add key "column"/value 
      ContentValues cv = new ContentValues(); 

      cv.put(Col_QUESTION,etQuestion.getText().toString().trim()); 
      cv.put(Col_ANS_ONE,etAnsOne.getText().toString().trim()); 
      cv.put(Col_COR_ANS_ONE,etCorAnsOne.getText().toString().trim()); 
      cv.put(Col_ANS_TWO,etAnsTwo.getText().toString().trim()); 
      cv.put(Col_COR_ANS_TWO,etCorAnsTwo.getText().toString().trim()); 
      cv.put(Col_ANS_THREE,etAnsThree.getText().toString().trim()); 
      cv.put(Col_COR_ANS_THREE,etCorAnsThree.getText().toString().trim()); 

      // 3. insert 
      final String QUIZ_INFO = "theBOT"; 
      db.insert(QUIZ_INFO, null, cv); 
      // 4. close 
      db.close(); 

      Toast.makeText(PageTwo.this, "Record Added", Toast.LENGTH_LONG).show(); 
      //doDrop(); 
      //dbHelper.iDid(); //Call to method in DBHelper -----<<<< READ 
     } 
    }); 
} 

sein