android orm映射框架（类似hibernate）基本使用

android orm映射框架，可像hibernate一样操作数据库。以下代码是我从网上摘录下来的，仅供参考.

package com.cng.utils;

import java.sql.SQLException;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.util.Log;

import com.cng.modal.Hello;

import com.j256.ormlite.android.apptools.OrmLiteSqliteOpenHelper;
import com.j256.ormlite.dao.Dao;
import com.j256.ormlite.support.ConnectionSource;
import com.j256.ormlite.table.TableUtils;

public class DataHelper extends OrmLiteSqliteOpenHelper
{

    private static final String DATABASE_NAME = "HelloOrmlite.db";
    private static final int DATABASE_VERSION = 1;
    private Dao<Hello, Integer> helloDao = null;

    public DataHelper(Context context)
    {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase db, ConnectionSource connectionSource)
    {
        try
        {
            TableUtils.createTable(connectionSource, Hello.class);
        } catch (SQLException e)
        {
            Log.e(DataHelper.class.getName(), "创建数据库失败", e);
            e.printStackTrace();
        }
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, ConnectionSource connectionSource,
            int arg2, int arg3)
    {
        try
        {
            TableUtils.dropTable(connectionSource, Hello.class, true);
            onCreate(db, connectionSource);
        } catch (SQLException e)
        {
            Log.e(DataHelper.class.getName(), "更新数据库失败", e);
            e.printStackTrace();
        }
    }

    @Override
    public void close()
    {
        super.close();
        helloDao = null;
    }

    public Dao<Hello, Integer> getHelloDataDao() throws SQLException
    {
        if (helloDao == null)
        {
            helloDao = getDao(Hello.class);
        }
        return helloDao;
    }
}

package com.cng;

import java.sql.SQLException;
import java.util.List;

import com.cng.modal.Hello;
import com.cng.utils.DataHelper;
import com.j256.ormlite.android.apptools.OrmLiteBaseActivity;
import com.j256.ormlite.dao.Dao;

import android.os.Bundle;
import android.widget.TextView;

public class OrmliteLoginActivity extends OrmLiteBaseActivity<DataHelper>
{
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        TextView tv = (TextView) this.findViewById(R.id.output);
        try
        {
            Dao<Hello, Integer> helloDao = getHelper().getHelloDataDao();
            // 添加数据
            for (int i = 0; i < 2; i++)
            {
                Hello hello = new Hello("Hello" + i);
                helloDao.create(hello);
            }
            tv.setText(tv.getText() + "\n" + "添加数据完成");
            // 查询添加的数据
            List<Hello> hellos = helloDao.queryForAll();
            for (Hello h : hellos)
            {
                tv.setText(tv.getText() + "\n" + h.toString());
            }
//           删除数据第一条数据
            helloDao.delete(hellos.get(0));
            tv.setText(tv.getText() + "\n" + "删除数据完成");
            // 重新查询数据
            hellos = helloDao.queryForAll();
            for (Hello h : hellos)
            {
                tv.setText(tv.getText() + "\n" + h.toString());
            }

补充：移动开发 , Android ,