在一个数据库帮助程序类中添加多个表

Question

我有 2 个表 Employee 和 order 表，我试图将这些表实现到同一个数据库助手类中，但是这给了我几个错误，我应该创建另一个数据库助手类，还是我可以将它们实现到一个数据库助手类中表看起来像这样`public class DatabaseHelper extends SQLiteOpenHelper {    private static final String DB_NAME = "shopinstyle.db";    private static final String DB_TABLE = "Employee";    private static final String ORDER_TABLE = "Order";    //Employee    //columns    private static final String ID = "ID";    private static final String FNAME = "FNAME";    private static final String LNAME = "LNAME";    private static final String PNUMBER = "PNUMBER";    private static final String EMAIL = "EMAIL";    private static final String NIC = "NIC";    //Order    //columns    private static final String ord_ID = "ord_ID";    private static final String ord_Name = "ord_Name";    private static final String ord_Qty = "ord_Qty";    private static final String ord_Price = "ord_Price";    private static final String ord_Location = "ord_Location";    private static final String CREATE_TABLE = "CREATE TABLE " + DB_TABLE + " (" +            ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +            FNAME + " TEXT, " +            LNAME + " TEXT, " +            PNUMBER + " TEXT, " +            EMAIL + " TEXT, " +            NIC + " TEXT" + ")";    private static final String CREATE_TABLE_ORDER = "CREATE TABLE " + ORDER_TABLE + " (" +            ord_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +            ord_Name + " TEXT, " +            ord_Qty + " TEXT, " +            ord_Price + " TEXT, " +            ord_Location + " TEXT " + ")";    public DatabaseHelper(Context context) {        super(context, DB_NAME,ORDER_TABLE, null, 1);    }    @Override    public void onCreate(SQLiteDatabase sqLiteDatabase) {        sqLiteDatabase.execSQL(CREATE_TABLE);        sqLiteDatabase.execSQL(CREATE_TABLE_ORDER);    }这行有一个错误public DatabaseHelper(Context context) {    super(context, DB_NAME,ORDER_TABLE, null, 1);}

Answer 1

super()类的构造函数内部的cal 中的 3d 参数DatabaseHelper是factory您可以传递的参数null，而不是表的名称：

super(context, DB_NAME,null, 1);