SQLite数据库：第二个表不会添加新产品

Question

我正在做一个项目，我有两个表，一个存储应用程序的用户，另一个存储用户输入的产品。用户表工作正常但是当我查看我的logcat时，我发现没有产品进入产品表。数据库处理程序中的addproduct方法没有错误，所以我想知道我做错了什么？是数据库处理程序中的问题还是我添加产品的方式？任何帮助将非常感激？ 数据库处理程序代码：

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

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import com.example.john.fitnessapp.Products;
import com.example.john.fitnessapp.Users;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;


public class DatabaseHandler extends SQLiteOpenHelper {
    public static final String TAG = "DBHelper";
    //DATABASE VERSION
    private static int DATABASE_VERSION = 1;
    //DATABASE NAME
    private static final String DATABASE_NAME = "AppDatabase";
    //TABLE NAMES
    private static final String TABLE_USERS = "Users_Table";
    private static final String TABLE_PRODUCTS = "Products_Table";
    //COMMON COLUMN NAMES
    private static final String KEY_USER_ID = "User_ID";
    private static final String KEY_PRODUCT_ID = "Product_ID";
    //USER TABLE
    private static final String KEY_USERNAME = "Username";
    private static final String KEY_PASSWORD = "Password";
    private static final String KEY_AGE = "Age";
    private static final String KEY_EMAIL = "Email";
    private static final String KEY_GENDER = "Gender";
    private static final String KEY_HEIGHT = "Height";
    private static final String KEY_CURRENT_WEIGHT = "Current_Weight";
    private static final String KEY_START_WEIGHT = "Start_Weight";
    private static final String KEY_WEIGHT_CHANGE = "Weight_Change";
    private static final String KEY_BMI = "BMI";
    private static final String KEY_BMR = "BMR";
    private static final String KEY_REQ_CAL = "Required_Calories";
    private static final String KEY_MON_CAL = "Monday_Calories";
    private static final String KEY_TUES_CAL = "Tuesday_Calories";
    private static final String KEY_WED_CAL = "Wednesday_Calories";
    private static final String KEY_THUR_CAL = "Thursday_Calories";
    private static final String KEY_FRI_CAL = "Friday_Calories";
    private static final String KEY_SAT_CAL = "Saturday_Calories";
    private static final String KEY_SUN_CAL = "Sunday_Calories";
    //PRODUCT TABLE
    private static final String KEY_ITEMNAME = "Item_name";
    private static final String KEY_ITEMCALORIES = "Item_Calories";
    //
    private static final String CREATE_USER_TABLE = "CREATE TABLE " + TABLE_USERS + "( "
            + KEY_USER_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
            + KEY_USERNAME + " TEXT, "
            + KEY_PASSWORD + " TEXT, "
            + KEY_AGE + " INTEGER, "
            + KEY_EMAIL + " TEXT, "
            + KEY_GENDER + " TEXT, "
            + KEY_HEIGHT + " DOUBLE, "
            + KEY_START_WEIGHT + " DOUBLE, "
            + KEY_CURRENT_WEIGHT + " DOUBLE, "
            + KEY_WEIGHT_CHANGE + " DOUBLE, "
            + KEY_BMI + " DOUBLE, "
            + KEY_BMR + " DOUBLE, "
            + KEY_REQ_CAL + " DOUBLE, "
            + KEY_MON_CAL + " DOUBLE, "
            + KEY_TUES_CAL + " DOUBLE, "
            + KEY_WED_CAL + " DOUBLE, "
            + KEY_THUR_CAL + " DOUBLE, "
            + KEY_FRI_CAL + " DOUBLE, "
            + KEY_SAT_CAL + " DOUBLE, "
            + KEY_SUN_CAL + " DOUBLE ); ";

    private static final String CREATE_PRODUCT_TABLE = "CREATE TABLE " + TABLE_PRODUCTS + "( " + KEY_PRODUCT_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
            + KEY_ITEMNAME + " TEXT, "
            + KEY_ITEMCALORIES + " DOUBLE );";

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

    }

    public void onCreate(SQLiteDatabase db) {
        db.execSQL(CREATE_USER_TABLE);
        db.execSQL(CREATE_PRODUCT_TABLE);
    }

    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        Log.w(TAG,
                "Upgrading the database from version " + oldVersion + " to " + newVersion);
        DATABASE_VERSION = 2;
        db.execSQL("DROP TABLE IF IT EXISTS " + TABLE_USERS);
        db.execSQL("DROP TABLE IF IT EXISTS " + TABLE_PRODUCTS);
        onCreate(db);

    }

    //CRUD OPERATIONS

    public Users getUser(int id) {
        SQLiteDatabase db = this.getReadableDatabase();

        Cursor cursor = db.query(TABLE_USERS,
                new String[]{KEY_USER_ID, KEY_USERNAME, KEY_PASSWORD, KEY_AGE,
                        KEY_EMAIL, KEY_GENDER, KEY_HEIGHT, KEY_START_WEIGHT,
                        KEY_CURRENT_WEIGHT, KEY_WEIGHT_CHANGE, KEY_BMI, KEY_BMR,
                        KEY_REQ_CAL, KEY_MON_CAL, KEY_TUES_CAL, KEY_WED_CAL,
                        KEY_THUR_CAL, KEY_FRI_CAL, KEY_SAT_CAL, KEY_SUN_CAL},
                KEY_USER_ID + "=?",
                new String[]{String.valueOf(id)}, null, null, null, null);
        if (cursor != null && cursor.getCount() > 0)
            cursor.moveToFirst();

        Users users = new Users(Integer.parseInt(cursor.getString(0)), cursor.getString(1),
                cursor.getString(2), cursor.getInt(3), cursor.getString(4), cursor.getString(5),
                cursor.getDouble(6), cursor.getDouble(7), cursor.getDouble(8), cursor.getDouble(9),
                cursor.getDouble(10), cursor.getDouble(11), cursor.getDouble(12), cursor.getDouble(13),
                cursor.getDouble(14), cursor.getDouble(15), cursor.getDouble(16), cursor.getDouble(17), cursor.getDouble(18), cursor.getDouble(19));
        cursor.close();
        return users;

    }

    public void addUser(Users users) {
        SQLiteDatabase db = this.getWritableDatabase();
        ContentValues values = new ContentValues();
        values.put(KEY_USERNAME, users.get_username());
        values.put(KEY_PASSWORD, users.get_password());
        values.put(KEY_AGE, users.get_age());
        values.put(KEY_EMAIL, users.get_email());
        values.put(KEY_GENDER, users.get_gender());
        values.put(KEY_HEIGHT, users.get_height());
        values.put(KEY_START_WEIGHT, users.get_startWeight());
        values.put(KEY_CURRENT_WEIGHT, users.get_currentWeight());
        values.put(KEY_WEIGHT_CHANGE, users.get_weightChange());
        values.put(KEY_BMI, users.get_BMI());
        values.put(KEY_BMR, users.get_BMR());
        values.put(KEY_REQ_CAL, users.get_reqCal());
        values.put(KEY_MON_CAL, users.get_monCal());
        values.put(KEY_TUES_CAL, users.get_tuesCal());
        values.put(KEY_WED_CAL, users.get_wedCal());
        values.put(KEY_THUR_CAL, users.get_thurCal());
        values.put(KEY_FRI_CAL, users.get_friCal());
        values.put(KEY_SAT_CAL, users.get_satCal());
        values.put(KEY_SUN_CAL, users.get_sunCal());

        db.insert(TABLE_USERS, null, values);
        db.close();
    }

    public int getUserCount() {
        String countQuery = "SELECT * FROM " + TABLE_USERS;
        SQLiteDatabase db = this.getReadableDatabase();
        Cursor cursor = db.rawQuery(countQuery, null);
        int count = cursor.getCount();
        cursor.close();
        return count;

    }

    public int updateUser(Users users) {
        SQLiteDatabase db = this.getWritableDatabase();

        ContentValues values = new ContentValues();
        values.put(KEY_USERNAME, users.get_username());
        values.put(KEY_PASSWORD, users.get_password());
        values.put(KEY_AGE, users.get_age());
        values.put(KEY_EMAIL, users.get_email());
        values.put(KEY_GENDER, users.get_gender());
        values.put(KEY_HEIGHT, users.get_height());
        values.put(KEY_START_WEIGHT, users.get_startWeight());
        values.put(KEY_CURRENT_WEIGHT, users.get_currentWeight());
        values.put(KEY_WEIGHT_CHANGE, users.get_weightChange());
        values.put(KEY_BMI, users.get_BMI());
        values.put(KEY_BMR, users.get_BMR());
        values.put(KEY_REQ_CAL, users.get_reqCal());
        values.put(KEY_MON_CAL, users.get_monCal());
        values.put(KEY_TUES_CAL, users.get_tuesCal());
        values.put(KEY_WED_CAL, users.get_wedCal());
        values.put(KEY_THUR_CAL, users.get_thurCal());
        values.put(KEY_FRI_CAL, users.get_friCal());
        values.put(KEY_SAT_CAL, users.get_satCal());
        values.put(KEY_SUN_CAL, users.get_sunCal());

        return db.update(TABLE_USERS, values, KEY_USER_ID + " = ?",
                new String[]{String.valueOf(users.get_id())});
    }

    public List<Users> getallUsers() {
        List<Users> usersList = new ArrayList<Users>();
        String selectQuery = "SELECT * FROM " + TABLE_USERS;
        SQLiteDatabase db = this.getWritableDatabase();
        Cursor cursor = db.rawQuery(selectQuery, null);

        if (cursor.moveToFirst()) {
            do {
                Users users = new Users();
                users.set_id(Integer.parseInt(cursor.getString(0)));
                users.set_username(cursor.getString(1));
                users.set_password(cursor.getString(2));
                users.set_age(cursor.getInt(3));
                users.set_email(cursor.getString(4));
                users.set_gender(cursor.getString(5));
                users.set_height(cursor.getDouble(6));
                users.set_startWeight(cursor.getDouble(7));
                users.set_currentWeight(cursor.getDouble(8));
                users.set_weightChange();
                users.set_BMI(cursor.getDouble(10));
                users.set_BMR(cursor.getDouble(11));
                users.set_reqCal(cursor.getDouble(12));
                users.set_monCal(cursor.getDouble(13));
                users.set_tuesCal(cursor.getDouble(14));
                users.set_wedCal(cursor.getDouble(15));
                users.set_thurCal(cursor.getDouble(16));
                users.set_friCal(cursor.getDouble(17));
                users.set_satCal(cursor.getDouble(18));
                users.set_sunCal(cursor.getDouble(19));
                usersList.add(users);
            } while (cursor.moveToNext());
        }
        return usersList;
       }




 public List<Products> getallProducts(){
    ArrayList<Products> productList = new ArrayList<Products>();
    String selectQuery = "SELECT * FROM " + TABLE_PRODUCTS;
    SQLiteDatabase db = this.getReadableDatabase();
    Cursor cursor = db.rawQuery(selectQuery, null);
    if(cursor.moveToFirst()){
        do {
            Products products = new Products();
            products.set_id(cursor.getInt(0));
            products.set_itemName(cursor.getString(1));
            products.set_itemCalorie(cursor.getDouble(2));
        }while (cursor.moveToNext());
    }
    cursor.close();
    return productList;

}

public void addProduct(Products products){
    SQLiteDatabase db = getWritableDatabase();
    ContentValues values = new ContentValues();
    values.put(KEY_ITEMNAME, products.get_itemName());
    values.put(KEY_ITEMCALORIES, products.get_itemCalorie());

    db.insert(TABLE_PRODUCTS, null, values);
    db.close();
}
public int getProductCount(){
    String countQuery = "SELECT * FROM " + TABLE_PRODUCTS;
    SQLiteDatabase db = getReadableDatabase();
    Cursor cursor = db.rawQuery(countQuery, null);
    int count = cursor.getCount();
    cursor.close();
    return count;
}

Answer 1

我希望产品列表插入到表格中。但是您错过了将产品添加到列表中

public List<Products> getallProducts() {
        ArrayList<Products> productList = new ArrayList<Products>();
        String selectQuery = "SELECT * FROM " + TABLE_PRODUCTS;
        SQLiteDatabase db = this.getReadableDatabase();
        Cursor cursor = db.rawQuery(selectQuery, null);
        if (cursor.moveToFirst()) {
            do {
                Products products = new Products();
                products.set_id(cursor.getInt(0));
                products.set_itemName(cursor.getString(1));
                products.set_itemCalorie(cursor.getDouble(2));

  

productList.add（产品）;

            } while (cursor.moveToNext());
        }
        cursor.close();
        return productList;

    }