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SQLite数据库存储
小編覺得挺不錯的,現在分享給大家,幫大家做個參考.
因為前面提到xml存儲更改文件很麻煩的緣故，最終還是選擇了使用數據庫存儲
一試才覺十分的方便，速度也快
上源碼：
[java]?view plaincopy
public?class?DBHelper??extends?SQLiteOpenHelper{?? ?? ????private?final?static?String?DATABASE_NAME="fanliao_db";?? ????private?final?static?int?DATABASE_VERSION=1;?? ????private?final?static?String?TABLE_NAME="fanliao_chat";?? ????public?final?static?String?CHAT_ID="_id";??? ????public?final?static?String?CHAT_Name="chatname";?? ????public?final?static?String?CHAT_Info="chatinfo";?? ????public?final?static?String?CHAT_Time="chattime";?? ?????? ?????? ????public?DBHelper(Context?context)?? ????{?? ????????super(context,?DATABASE_NAME,null,?DATABASE_VERSION);?? ????}?? ?????? ?????? ??????? ????@Override?? ????public?void?onCreate(SQLiteDatabase?db)?{?? ????????? ?????????? ????????String?sql="CREATE?TABLE?"+TABLE_NAME+"("+CHAT_ID+"??INTEGER?PRIMARY?KEY??AUTOINCREMENT,"?? ????????+CHAT_Name+"?TEXT,?"+CHAT_Time+"?TEXT,?"+CHAT_Info+"?TEXT);";?? ????????db.execSQL(sql);?? ????????System.out.println(sql);?? ??????????? ????}?? ?? ????@Override?? ????public?void?onUpgrade(SQLiteDatabase?db,?int?oldVersion,?int?newVersion)?{?? ????????String?sql="?DROP?TABLE?IF?EXISTS?"+TABLE_NAME;?? ????????db.execSQL(sql);?? ????????onCreate(db);?? ????????System.out.println(sql);?? ????}?? ?? ????public?Cursor?select()?? ????{?? ????????SQLiteDatabase?db=this.getReadableDatabase();?? ????????Cursor?cursor=db.query(TABLE_NAME,?null,?null,?null,?null,?null,??"?_id?asc");?? ????????return?cursor;?? ????}?? ?????? ????public?long?insert(String?chatname,?String?chattime,?String?chatinfo)?? ????{?? ????????SQLiteDatabase?db=this.getWritableDatabase();?? ????????ContentValues?cv=new?ContentValues();??? ????????cv.put(CHAT_Name,?chatname);?? ????????cv.put(CHAT_Time,?chattime);?? ????????cv.put(CHAT_Info,?chatinfo);?? ????????long?row=db.insert(TABLE_NAME,?null,?cv);?? ????????return?row;?? ????}?? ?????? ????public?void?delete(int?id)?? ????{?? ????????SQLiteDatabase?db=this.getWritableDatabase();?? ????????String?where=CHAT_ID+"=?";?? ????????String[]?whereValue={Integer.toString(id)};?? ????????db.delete(TABLE_NAME,?where,?whereValue);?? ????}?? ?????? ????public?void?update(int?id,String?chatname,String?chattime,?String?chatinfo)?? ????{?? ????????SQLiteDatabase?db=this.getWritableDatabase();?? ????????String?where=CHAT_ID+"=?";?? ????????String[]?whereValue={Integer.toString(id)};?? ????????ContentValues?cv=new?ContentValues();??? ????????cv.put(CHAT_Name,?chatname);?? ????????cv.put(CHAT_Time,?chattime);?? ????????cv.put(CHAT_Info,?chatinfo);?? ????????db.update(TABLE_NAME,?cv,?where,?whereValue);?? ????}?? ?????? ????public?void?delall(){?? ????????SQLiteDatabase?db=this.getReadableDatabase();?? ????????String?sql="?DROP?TABLE?IF?EXISTS?"+TABLE_NAME;?? ????????db.execSQL(sql);?? ????????onCreate(db);?? ????}?? ?????? ?????? }??
用后才覺得經常修改的數據本就應用數據庫的，
形如“聊天記錄”這種雖沒有十分復雜的存儲結構，也是適宜存在表中，
而xml大概多是用以傳輸數據或存儲少量不常用改動的數據把~
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