package com.example.intelligencecontrol.utils;import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;public class MyDBOpenHelper extends SQLiteOpenHelper
{public MyDBOpenHelper(Context context, String name, SQLiteDatabase.CursorFactory paramCursorFactory, int version){super(context, name，null, version);}public void onCreate(SQLiteDatabase db) //初次使用软件时生成数据库表{db.execSQL("CREATE TABLE"+ " control(_id int auto_increment primary key, cname VARCHAR(20), ccommand VARCHAR(20), ccalendar VARCHAR(20))");}/*** 升级软件时更新数据库表结构*/
  public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) //newVersion新版本号为代码控制{db.execSQL("CREATE TABLE control(_id int auto_increment primary key ,cname VARCHAR(20), ccommand VARCHAR(20), ccalendar VARCHAR(20))");}//_id int auto_increment primary key设置id自增长
}

private MyDBOpenHelper myDBOpenHelper;
private SQLiteDatabase db;
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myDBOpenHelper = new MyDBOpenHelper(this, "control.db", null, 1);
db = myDBOpenHelper.getWritableDatabase(); Cursor cursor = db.rawQuery("select * from control", null);
while (cursor.moveToNext())   //获取数据库的信息
    {TimerTaskItem taskItem = new TimerTaskItem();taskItem.setName(cursor.getString(1));taskItem.setCommand(cursor.getString(2));taskItem.setCommandTime(cursor.getString(3));item.add(taskItem);}
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. //插入数据库
db.execSQL("insert into control values(null,?,?,?)",new String[] { itemData.getName(), itemData.getCommand(),itemData.getCommandTime() });
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. //删除数据库db.delete("control", "cname = ? and ccommand = ? and ccalendar = ?",        new String[] { item.get(position).getName(), item.get(position).getCommand(),          item.get(position).getCommandTime() });
/*** 关闭数据库*/
    @Override
public void onDestroy()
{super.onDestroy();if (myDBOpenHelper != null) {myDBOpenHelper.close();}
}