如何在Android中的SQLite數據庫中插入數據？

Question

我在我的Android應用程序中實現SQLite數據庫我想從JSON中檢索數據並將其存儲到SQLite數據庫中。我看到了使用SQLite的示例之一，但我使用了不同的列名稱wchi存儲到SQLite數據庫中。

但是當我運行我得到錯誤，如應用程序=

（（1）表中的聯繫人沒有列命名成本，

錯誤插入PHONE_NUMBER = 9533333333成本= 46456名= KARTHIK ，

android.database.sqlite.SQLiteException：表中的聯繫人沒有指定的列成本（代碼1）：在編譯：（？，？，？）INSERT INTO觸點（PHONE_NUMBER，成本，名稱）VALUES）

public class DatabaseHandler extends SQLiteOpenHelper { 

    // All Static variables 
    // Database Version 
    private static final int DATABASE_VERSION = 1; 

    // Database Name 
    private static final String DATABASE_NAME = "contactsManager"; 

    // Contacts table name 
    private static final String TABLE_CONTACTS = "contacts"; 

    // Contacts Table Columns names 
    private static final String KEY_ID = "id"; 
    private static final String KEY_NAME = "name"; 
    private static final String KEY_COST = "cost"; 
    private static final String KEY_PH_NO = "phone_number"; 

    public DatabaseHandler(Context context) { 
     super(context, DATABASE_NAME, null, DATABASE_VERSION); 
    } 

    // Creating Tables 
    @Override 
    public void onCreate(SQLiteDatabase db) { 
     String CREATE_CONTACTS_TABLE = "CREATE TABLE " + TABLE_CONTACTS + "(" 
       + KEY_ID + " INTEGER PRIMARY KEY," + KEY_NAME + " TEXT," 
       + KEY_COST + " TEXT," 
       + KEY_PH_NO + " TEXT" + ")"; 
     db.execSQL(CREATE_CONTACTS_TABLE); 
    } 

    // Upgrading database 
    @Override 
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
     // Drop older table if existed 
     db.execSQL("DROP TABLE IF EXISTS " + TABLE_CONTACTS); 

     // Create tables again 
     onCreate(db); 
    } 

    /** 
    * All CRUD(Create, Read, Update, Delete) Operations 
    */ 

    // Adding new contact 
    void addContact(Contact contact) { 
     SQLiteDatabase db = this.getWritableDatabase(); 

     ContentValues values = new ContentValues(); 
     values.put(KEY_NAME, contact._name); // Contact Name 
     values.put(KEY_COST, contact._cost); // Contact Phone 
     values.put(KEY_PH_NO, contact._mobile); //Contact phone no 

     // Inserting Row 
     db.insert(TABLE_CONTACTS, null, values); 
     db.close(); // Closing database connection 
    } 

    // Getting single contact 
    Contact getContact(int id) { 
     SQLiteDatabase db = this.getReadableDatabase(); 

     Cursor cursor = db.query(TABLE_CONTACTS, new String[] { KEY_ID, 
       KEY_NAME, KEY_COST, KEY_PH_NO }, KEY_ID + "=?", 
       new String[] { String.valueOf(id) }, null, null, null, null); 
     if (cursor != null) 
      cursor.moveToFirst(); 

     Contact contact = new Contact(Integer.parseInt(cursor.getString(0)), 
       cursor.getString(1), cursor.getString(2),cursor.getString(3)); 

     // return contact 
     return contact; 
    } 

    // Getting All Contacts 
    public List<Contact> getAllContacts() { 
     List<Contact> contactList = new ArrayList<Contact>(); 
     // Select All Query 
     String selectQuery = "SELECT * FROM " + TABLE_CONTACTS; 

     SQLiteDatabase db = this.getWritableDatabase(); 
     Cursor cursor = db.rawQuery(selectQuery, null); 

     // looping through all rows and adding to list 
     if (cursor.moveToFirst()) { 
      do { 
       Contact contact = new Contact(); 

       contact.set_id(Integer.parseInt(cursor.getString(0))); 
       contact.set_name(cursor.getString(1)); 
       contact.set_cost(cursor.getString(2)); 
       contact.set_mobile(cursor.getString(3)); 
       contactList.add(contact); 
      } while (cursor.moveToNext()); 
     } 

     // return contact list 
     return contactList; 
    } 

    // Updating single contact 
    public int updateContact(Contact contact) { 
     SQLiteDatabase db = this.getWritableDatabase(); 

     ContentValues values = new ContentValues(); 
     values.put(KEY_NAME, contact.get_name()); 
     values.put(KEY_COST, contact.get_cost()); 
     values.put(KEY_PH_NO, contact.get_mobile()); 

     // updating row 
     return db.update(TABLE_CONTACTS, values, KEY_ID + " = ?", 
       new String[] { String.valueOf(contact.get_id()) }); 
    } 

    // Deleting single contact 
    public void deleteContact(Contact contact) { 
     SQLiteDatabase db = this.getWritableDatabase(); 
     db.delete(TABLE_CONTACTS, KEY_ID + " = ?", 
       new String[] { String.valueOf(contact.get_id()) }); 
     db.close(); 
    } 


    // Getting contacts Count 
    public int getContactsCount() { 
     String countQuery = "SELECT * FROM " + TABLE_CONTACTS; 
     SQLiteDatabase db = this.getReadableDatabase(); 
     Cursor cursor = db.rawQuery(countQuery, null); 
     cursor.close(); 

     // return count 
     return cursor.getCount(); 
    } 

} 

Answer 1

改變這一行

private static final int DATABASE_VERSION = 1; 

這個

private static final int DATABASE_VERSION = 2; 

，並再次檢查你的工作。

Answer 2

嘗試清除您的應用程序數據，然後重新運行應用程序，之前您可能有不同的列並運行應用程序一次（意味着不會再次調用創建表）。