创建Sqlite数据库(一)

对这方面的掌握不牢,慢慢深入吧,先执行一个sqlite语句,只会简单的.输出"创建"证明创建成功

public class MainActivity extends AppCompatActivity {

    @Override

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Mysqlite mysqlite = new Mysqlite(this, "student", null, 2);



    }
}

上面是主activity

public class Mysqlite extends SQLiteOpenHelper {
    SQLiteDatabase readableDatabase;
    public Mysqlite(Context context, String name, SQLiteDatabase.CursorFactory factory, int version) {
        super(context, name, factory, version);
        readableDatabase = getWritableDatabase();//创建数据库不需要什么权限,但是这行代码一定要写
    }

    @Override
    public void onCreate(SQLiteDatabase db) {

        db.execSQL("create table student (id integer,name varchar)");
        System.out.println("创建");
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

    }
}

继承DBhelp并实现两个方法