在库存应用中保存或添加新产品时，我遇到了保存数据库的错误。我猜这与数量有关，但我不知道如何解决它。它说语法错误我只是无法弄明白。首先，它没有认识到数据库，因为它是错误的，但在更改后，它仍然无效。
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的：
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)
答案 0 :(得分：0)
不确定如何将所有字符串变量的数据收集到MODEL CLASS中，这是MVC设计概念的一部分。我将尝试包含一个链接看起来你没有这个设计，我不确定你是否已经创建了一个DBHelper类一旦你这样做，管理一个数据库是如此简单这里的任何方式都是存在于具有SAVE的Activity中的代码按钮和一堆名为etQuestion等的EditText字段，所以如果你想尝试这个伟大的一个奇怪的地方，我必须将字符串变量命名为TABLE，这样才能真正看到MVC设计
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
}
} );
}