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);