package com.shunzhi.parent.util;

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.support.ConnectionSource;
import com.j256.ormlite.table.TableUtils;
import com.shunzhi.parent.bean.ChildBean;

import java.sql.SQLException;
import java.util.HashMap;
import java.util.Map;

/**
 * Created by ToaHanDong on 2017/3/24.
 */

public class DatabaseHelper extends OrmLiteSqliteOpenHelper {
    private static final String TABLE_NAME = "parent.db";
    private Map<String, Dao> daos = new HashMap<String, Dao>();
    private static DatabaseHelper instance;

    public DatabaseHelper(Context context){
        super(context,TABLE_NAME,null,1);
    }

    /*
    创建数据库
     */
    @Override
    public void onCreate(SQLiteDatabase database, ConnectionSource connectionSource) {
        try {
            TableUtils.createTableIfNotExists(connectionSource, ChildBean.class);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void onUpgrade(SQLiteDatabase database, ConnectionSource connectionSource, int oldVersion, int newVersion) {
        try {
            TableUtils.dropTable(connectionSource,ChildBean.class,true);
            onCreate(database,connectionSource);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    //删除数据库
    public void deleteAll(){
        try {
            TableUtils.dropTable(connectionSource,ChildBean.class,true);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    public static synchronized DatabaseHelper getHelper(Context context){
        context=context.getApplicationContext();
        if (null==instance){
            synchronized (DatabaseHelper.class){
                if (null==instance){
                    instance=new DatabaseHelper(context);
                }
            }
        }
        return instance;
    }

    public synchronized Dao getDao(Class clazz) throws SQLException {
        Dao dao = null;
        String className = clazz.getSimpleName();

        if (daos.containsKey(className)) {
            dao = daos.get(className);
        }
        if (dao == null) {
            dao = super.getDao(clazz);
            daos.put(className, dao);
        }
        return dao;
    }

    /**
     * 释放资源
     */
    @Override
    public void close() {
        super.close();

        for (String key : daos.keySet())
        {
            Dao dao = daos.get(key);
            dao = null;
        }
    }
}