SQLite

public class MyDatabaseHelper extends SQLiteOpenHelper {
    public MyDatabaseHelper(Context context, String name, SQLiteDatabase.CursorFactory factory, int version) {
        super(context, name, factory, version);
    }
    //只有在第一次创建数据库文件时才会执行
    @Override
    public void onCreate(SQLiteDatabase db) {
        String createTableSql="create table Users (" +
                "Id integer primary key autoincrement , " +
                "Name text, Age integer ," +
                "Phone integer," +
                "Address text)";
        //执行创建表 SQL
        db.execSQL(createTableSql);
    }
    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        /*
            升级数据库
            当你想要修改数据表结构，添加数据，删除数据库是，可以将相应SQL写在这里。
            接的修改版本号(大于上一次)。

            eg:
            db.execSQL("drop table if exists Users");
            onCreate(db);
         */
    }
}

    MyDatabaseHelper myDBHepler = new MyDatabaseHelper(this, "DB.db", null, 1);
    SQLiteDatabase db = myDBHepler.getWritableDatabase();
    //添加数据
    db.execSQL("insert into  Users(name,age,phone,address) values(?,?,?,?)",
            new String[]{"Name1", "18", "123123", "AddressAddress"});
    //更新数据
    db.execSQL("update Users set Address= ? where name= ?",
            new String[]{"AddressUpdated", "Name1"});
    //删除数据
    db.execSQL("delete fom Users  where name= ?", new String[]{"Name2"});
    //查询数据
    Cursor cursor = db.rawQuery("select * from Users", null);
      //获取查询到的数据
    while (cursor.moveToNext()) {
        String name = cursor.getString(cursor.getColumnIndex("Name"));
        String age = cursor.getString(cursor.getColumnIndex("Age"));
        Toast.makeText(this, name, Toast.LENGTH_SHORT).show();
        Toast.makeText(this, age, Toast.LENGTH_SHORT).show();
    }    
    cursor.close();
    db.close ();
    Toast.makeText(this,"Ok", Toast.LENGTH_SHORT).show();