参数拼接方式实现SQLite数据库的增删改查

public class OtherPersonService {
	private DBOpenHelper dbOpenHelper;
	
	public OtherPersonService(Context context){
		dbOpenHelper = new DBOpenHelper(context);
	}
	
	public void save(Person person){
		SQLiteDatabase db = dbOpenHelper.getWritableDatabase();
		ContentValues values = new ContentValues();
		values.put("name",person.getName());
		values.put("phone",person.getPhone());
		values.put("amount",person.getAmount());
		db.insert("person",null,values);//insert into person(personid) values(NULL)
	}
	
	public void update(Person person){
		SQLiteDatabase db = dbOpenHelper.getWritableDatabase();
		ContentValues values = new ContentValues();
		values.put("name",person.getAmount());
		db.update("person",values,"personid=?",new String[]{person.getId().toString()});
	}
	
	public Person find(Integer id){
		SQLiteDatabase db = dbOpenHelper.getReadableDatabase();
		Cursor cursor = db.query("person",new String[]{id.toString()},null);
		if(cursor.moveToFirst()){
			int personid = cursor.getInt(cursor.getColumnIndex("personid"));
			int amount = cursor.getInt(cursor.getColumnIndex("amount"));
			String name = cursor.getString(cursor.getColumnIndex("name"));
			String phone = cursor.getString(cursor.getColumnIndex("phone"));
			cursor.close();
			return new Person(personid,name,phone,amount);
		}
		return null;
	}
	
	public void delete(Integer id){
		SQLiteDatabase db = dbOpenHelper.getWritableDatabase();
		db.delete("person",new String[]{id.toString()});
	}
	
	public List<Person> getScrollData(int offset,int maxResult){
		List<Person> persons = new ArrayList<Person>();
		SQLiteDatabase db = dbOpenHelper.getReadableDatabase();
		Cursor cursor = db.query("person","personid asc",offset+","+ maxResult);
		while(cursor.moveToNext()){
			int personid = cursor.getInt(cursor.getColumnIndex("personid"));
			int amount = cursor.getInt(cursor.getColumnIndex("amount"));
			String name = cursor.getString(cursor.getColumnIndex("name"));
			String phone = cursor.getString(cursor.getColumnIndex("phone"));
			persons.add(new Person(personid,amount));
		}
		cursor.close();
		return persons;
	}
	
	public long getCount(){
		SQLiteDatabase db = dbOpenHelper.getReadableDatabase();
		Cursor cursor = db.query("person",new String[]{"count(*)"},null);
		cursor.moveToFirst();
		return cursor.getLong(0);
	}
	
}

（编辑：李大同）

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