[Android学习系列8]数据库ormlite笔记

一.下载包

http://ormlite.com/

http://ormlite.com/releases/

把core包 和 android包   build path到项目里

二.参考资料

http://ormlite.com/

http://blog.csdn.net/joker_zhou/article/details/7869244

https://www.youtube.com/watch?v=beb-n2yq0kM&hd=1

三.自己写的

1.写一个类代表一个表

package com.example.test_ormlite;  
import com.j256.ormlite.field.DatabaseField;  
  
public class Person {  
      
    public static final String ID = "person_id";  
    public static final String Name = "person_name";  
    public static final String Info = "persin_info";  
      
    @DatabaseField(useGetSet = true , columnName = ID , generatedId = true)  
    private int id;  
      
    @DatabaseField(useGetSet = true , columnName = Name)  
    private String name;  
      
    @DatabaseField(useGetSet = true , columnName = Info)  
    private String info;  
      
    //必须提供一个无参数的构造函数，这个不能少  
    public Person() {}  
      
    //自定义构造函数  
    public Person( String name , String info) {  
        //super();  
        this.name = name;  
        this.info = info;  
    }  
      
    @Override  
    //方便输出查看  
    public String toString() {  
        return "id:" + id + " ,name:" + name + " ,info:" + info;  
    }  
  
    //get，set方法不能漏 之前就是漏了 结果报错无法运行  
    public int getId() {  
        return id;  
    }  
  
    public void setId(int id) {  
        this.id = id;  
    }  
  
    public String getName() {  
        return name;  
    }  
  
    public void setName(String name) {  
        this.name = name;  
    }  
  
    public String getInfo() {  
        return info;  
    }  
  
    public void setInfo(String info) {  
        this.info = info;  
    }  
      
}  

2.在res目录新建一个raw文件夹

继承一个OrmLiteConfigUtil类，  用来生成配置文件

package com.example.test_ormlite;  
  
import java.io.IOException;  
import java.sql.SQLException;  
  
import com.j256.ormlite.android.apptools.OrmLiteConfigUtil;  
  
public class MyConfigUtil extends OrmLiteConfigUtil {  
      
    public static final Class<?>[] classes = new Class[]{ Person.class };  
  
    public static void main(String[] args) throws SQLException,IOException {  
  
        writeConfigFile("my_ormlite_config.txt",classes);  
          
    }  
  
}  

　　

以j2se的形式run这个类，  对MyConfigUtil.java  进行 run as  的配置

3.第2步完成后会在raw里面生成表的配置文件my_ormlite_config.txt，然后我们就可以写一个DatabaseHelper加载它

  并在里面实现创建DAO的方法

package com.example.test_ormlite;  
  
import java.sql.SQLException;  
  
import android.R.integer;  
import android.content.Context;  
import android.database.sqlite.SQLiteDatabase;  
  
import com.j256.ormlite.android.apptools.OrmLiteSqliteOpenHelper;  
import com.j256.ormlite.dao.Dao;  
import com.j256.ormlite.dao.RuntimeExceptionDao;  
import com.j256.ormlite.support.ConnectionSource;  
import com.j256.ormlite.table.TableUtils;  
  
public class MyDatabaseHelper extends OrmLiteSqliteOpenHelper {  
      
    public static final String DATABASE_NAME = "mydatabase.db";  
    public static final int DATABASE_VERSION = 1;  
      
    private Dao<Person,Integer> personDao = null;  
    private RuntimeExceptionDao<Person, Integer> personRuntimeDao = null;  
      
    public MyDatabaseHelper(Context context) {  
        //加载数据库 和  表的配置文件  
        super(context, DATABASE_NAME,  null , R.raw.my_ormlite_config);  
    }  
      
    @Override  
    public void onCreate(SQLiteDatabase db, ConnectionSource con) {  
        try {  
              
            //创建表  
            TableUtils.createTable(con, Person.class);  
              
        } catch (SQLException e) {  
            // TODO Auto-generated catch block  
            e.printStackTrace();  
        }  
    }  
      
    @Override  
    public void onUpgrade(SQLiteDatabase db, ConnectionSource con, int oldVersion,  
            int newVersion) {  
        try {  
            //删除表  
            TableUtils.dropTable(con, Person.class, true);  
            //重建表  
            TableUtils.createTable(con, Person.class);  
              
        } catch (SQLException e) {  
            // TODO Auto-generated catch block  
            e.printStackTrace();  
        }  
    }  
      
    //person类的DAO  
    public Dao<Person, Integer> getDao() throws SQLException {  
          
        if( personDao == null )  
        {  
            personDao = getDao(Person.class);  
        }  
          
        return personDao;   
              
    }  
      
    //person类的RuntimeDao  
    public RuntimeExceptionDao<Person, Integer> getPersonRuntimeExceptionDao() {  
          
        if( personRuntimeDao == null )  
        {  
            personRuntimeDao = getRuntimeExceptionDao(Person.class);  
        }  
        return personRuntimeDao;  
          
    }  
      
}  

　　

4.然后就可以在activity里面做一些测试了

package com.example.test_ormlite;  
  
import java.util.List;  
  
import com.j256.ormlite.android.apptools.OpenHelperManager;  
import com.j256.ormlite.dao.RuntimeExceptionDao;  
  
import android.os.Bundle;  
import android.app.Activity;  
import android.database.DatabaseUtils;  
import android.util.Log;  
import android.view.Menu;  
  
public class MainActivity extends Activity {  
  
    MyDatabaseHelper myDbHelper = null;  
      
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_main);  
          
              
        doSomeTestWithOrmlite();  
    }  
  
    private void doSomeTestWithOrmlite() {  
          
        //建立databaseHelper  
        myDbHelper = OpenHelperManager.getHelper(this,MyDatabaseHelper.class);  
          
        //用databaseHelper 建立 dao  
        RuntimeExceptionDao<Person, Integer> personDao = myDbHelper.getPersonRuntimeExceptionDao();  
          
        //插入三条数据  
        personDao.create(new Person("姓名1","猜猜他是谁") );  
        personDao.create(new Person("姓名2","猜猜他是谁") );  
        personDao.create(new Person("姓名s","猜猜他是谁") );  
          
        //输出全部数据  
        List<Person>  list_person = personDao.queryForAll();  
        Log.d( "mytag", list_person.toString() );  
          
          
        //释放helper  
        OpenHelperManager.releaseHelper();  
  
          
    }  
  
    @Override  
    public boolean onCreateOptionsMenu(Menu menu) {  
        // Inflate the menu; this adds items to the action bar if it is present.  
        getMenuInflater().inflate(R.menu.main, menu);  
        return true;  
    }  
  
}