android中SQLite实现

package com.example.administrator.myapplication;

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

public class BookmarkSQLiteOpenHelper extends SQLiteOpenHelper{
public BookmarkSQLiteOpenHelper(Context context, String name, SQLiteDatabase.CursorFactory factory, int version){
super(context,name,factory,version);
}

@Override
public void onCreate(SQLiteDatabase db){
String sql="create table bookmark(id integer primary key autoincrement,favicon varchar(100),title varchar(100),url varchar(100))";
db.execSQL(sql);
}

@Override
public void onUpgrade(SQLiteDatabase db,int oldVersion,int newVersion){}
}

bookmarkSQLiteOpenHelper=new BookmarkSQLiteOpenHelper(this,"browser.db",null,1);

void insertBookmark(Bookmark bookmark){
SQLiteDatabase db=bookmarkSQLiteOpenHelper.getWritableDatabase();
db.execSQL("insert into bookmark(favicon,title,url)values(?,?,?)",new String[]{bookmark.getFavicon(),bookmark.getTitle(),bookmark.getUrl()});
}

bookmarkSQLiteOpenHelper=new BookmarkSQLiteOpenHelper(this,"browser.db",null,1);
SQLiteDatabase db=bookmarkSQLiteOpenHelper.getReadableDatabase();
Cursor cursor=db.rawQuery("select * from bookmark",null);
while(cursor.moveToNext()){
String favicon=cursor.getString(cursor.getColumnIndex("favicon"));
String title=cursor.getString(cursor.getColumnIndex("title"));
String url=cursor.getString(cursor.getColumnIndex("url"));

Bitmap bitmap=null;
try{
String sdcard_path=Environment.getExternalStorageDirectory().getCanonicalPath();
String bitmap_path=sdcard_path+"/xinyuelantuBrowserFavicon/"+favicon+".jpg";
bitmap=BitmapFactory.decodeFile(bitmap_path);
}
catch(IOException e){}
Map<String,Object> map_bookmark=new HashMap<String,Object>();
map_bookmark.put("favicon",bitmap);
map_bookmark.put("title",title);
map_bookmark.put("url",url);
arraylist_bookmark.add(map_bookmark);
}