DBOpenManager.java

package com.sets.speedtest.manager;

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

import com.sets.speedtest.db.DBOpenHelper;

/**
 * 全局唯一的db管理类
 * 
 * @author : lipan
 * @create_time : 2014年4月19日 下午4:35:32
 * @desc : 全局唯一的db管理类
 * @update_time :
 * @update_desc :
 *
 */
public class DBOpenManager
{

    private static DBOpenManager instance;

    private DBOpenHelper helper;
    private SQLiteDatabase db; // 用户数据库
    private SQLiteDatabase baseDb; //基础数据库
    private static Context context;

    public static DBOpenManager getInstance()
    {
        if (instance != null)
            return instance;

        synchronized (DBOpenHelper.class)
        {
            if (instance != null)
                return instance;

            instance = new DBOpenManager();
            return instance;
        }
    }

    public static void reset(Context contextP)
    {
        context = contextP;
        DBOpenManager dbOpenManager = getInstance();
        dbOpenManager.init();
    }

    private DBOpenManager()
    {
        // 用户数据库
        helper = new DBOpenHelper(context);
        db = helper.getWritableDatabase();
        baseDb = helper.openBaseDatabase();
    }

    private void init()
    {
    }

    public DBOpenHelper getHelper()
    {
        return helper;
    }

    public void beginTransaction()
    {
        db.beginTransaction();
    }

    public void setTransactionSuccessful()
    {
        db.setTransactionSuccessful();
    }

    public void endTransaction()
    {
        db.endTransaction();
    }

    public SQLiteDatabase getBaseDb()
    {
        return baseDb;
    }

}