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经常用得到的安卓数据库基类
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经常用得到的安卓数据库基类
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- //創建數據庫??
- public?class?DBCreate?{??
- ????public?static?void?CreateDatabase(SQLiteDatabase?db)?{??
- ????????db.beginTransaction();??
- ????????try?{??
- ????????????create_NetTaskBuffer(db);??
- ??
- ????????????insert_SQL(db);??
- ??
- ????????????db.setTransactionSuccessful();??
- ????????}?catch?(Exception?e)?{??
- ????????????e.printStackTrace();??
- ????????}?finally?{??
- ????????????db.endTransaction();??
- ????????}??
- ????}??
- ??
- ????//?緩存??
- ????private?static?void?create_NetTaskBuffer(SQLiteDatabase?db)?{??
- ????????db.execSQL("DROP?TABLE?IF?EXISTS?NetTaskBuffer");??
- ????????StringBuilder?sql?=?new?StringBuilder();??
- ????????sql.append("CREATE?TABLE?IF?NOT?EXISTS?NetTaskBuffer?(");??
- ????????sql.append("?id?INTEGER?PRIMARY?KEY?AUTOINCREMENT,");?//?這一列不能修改??
- ????????sql.append("?label?TEXT?COLLATE?NOCASE,");?//??
- ????????sql.append("?param?TEXT?COLLATE?NOCASE,");?//??
- ????????sql.append("?result?TEXT?COLLATE?NOCASE,");?//??
- ????????sql.append("?remark?TEXT?COLLATE?NOCASE,");??
- ????????sql.append("?time?LONG)");?//??
- ????????db.execSQL(sql.toString());??
- ????}??
- ??
- ????//?插入語句,初始化數據庫使用??
- ????private?static?void?insert_SQL(SQLiteDatabase?db)?{??
- ??????????
- ????}??
- }??
- ??
- ??
- ??
- //----------------------數據庫操作基類--------------------------------------//??
- ??
- ??
- /**?
- ?*?數據庫基本操作類,數據庫的創建,更新的操作都在這里進行?
- ?*??
- ?*?@author?yizhe?
- ?*?@date?2014-9-11?
- ?*/??
- public?abstract?class?DBHelper?extends?SQLiteOpenHelper?{??
- ??
- ????static?String?name?=?"hk.db";?//?數據庫名稱??
- ????static?CursorFactory?cursorFactory?=?null;??
- ????static?int?version?=?1000;//?初始版本:1000??
- ????Context?context;??
- ??
- ????protected?ContentValues?contentValues;?//?cursor對象轉行中介,給子類使用??
- ??
- ????protected?String?tableName;??
- ??
- ????protected?DBHelper(Context?context,?String?tableName)?{??
- ????????super(context,?name,?cursorFactory,?version);??
- ????????this.context?=?context;??
- ????????this.tableName?=?tableName;??
- ????}??
- ??
- ????/**?
- ?????*?軟件第一次安裝的時候會調用,覆蓋安裝不會調用?
- ?????*/??
- ????public?void?onCreate(SQLiteDatabase?db)?{??
- ????????//?所有表的創建過程都在這里進行??
- ????????DBCreate.createDatabase(db);??
- ????}??
- ??
- ????/**?
- ?????*?覆蓋安裝,當版本號version發生變化的時候,這個方法才會被調用,而且只執行一次?
- ?????*/??
- ????public?void?onUpgrade(SQLiteDatabase?db,?int?oldVersion,?int?newVersion)?{??
- ????????onCreate(db);??
- ????????//?if?(oldVersion?<?109)?{??
- ????????//?onCreate(db);??
- ????????//?}?else?{??
- ????????//?}??
- ????}??
- ??
- ????/**?
- ?????*?每次成功打開數據庫后首先被執行?
- ?????*/??
- ????public?void?onOpen(SQLiteDatabase?db)?{??
- ????????super.onOpen(db);?//?每次成功打開數據庫后首先被執行??
- ????}??
- ??
- ????public?void?finalize()?{??
- ????????close();??
- ????}??
- ??
- ????//?--------------------------sql方法---------------------------------//??
- ????/**?
- ?????*?執行sql,沒有返回?
- ?????*/??
- ????public?void?execSQL(String?sql)?{??
- ????????System.out.println("==execSQL=="?+?sql);??
- ????????SQLiteDatabase?db?=?getWritableDatabase();??
- ????????db.execSQL(sql);??
- ????????db.close();??
- ????}??
- ??
- ????/**?
- ?????*?批量執行sql,內部啟用事務?
- ?????*??
- ?????*?@param?list?
- ?????*????????????sql列表?
- ?????*?@return?是否執行成功?
- ?????*/??
- ????public?boolean?execSQLBatch(ArrayList<String>?list)?{??
- ????????SQLiteDatabase?db?=?getWritableDatabase();??
- ????????db.beginTransaction();??
- ????????try?{??
- ????????????for?(String?sql?:?list)?{??
- ????????????????db.execSQL(sql);??
- ????????????}??
- ????????????db.setTransactionSuccessful();??
- ????????}?catch?(Exception?e)?{??
- ????????????e.printStackTrace();??
- ????????????return?false;??
- ????????}?finally?{??
- ????????????db.endTransaction();??
- ????????????db.close();??
- ????????}??
- ????????return?true;??
- ????}??
- ??
- ????/**?
- ?????*?根據id刪除記錄?
- ?????*??
- ?????*?@param?id?
- ?????*????????????表中必須有"id"字段?
- ?????*?@return?the?number?of?rows?affected?if?a?whereClause?is?passed?in,?0?
- ?????*?????????otherwise.?To?remove?all?rows?and?get?a?count?pass?"1"?as?the?
- ?????*?????????whereClause.?
- ?????*/??
- ????public?int?delete(int?id)?{??
- ????????SQLiteDatabase?db?=?getWritableDatabase();??
- ????????int?result?=?db.delete(tableName,?"id=?",?new?String[]?{?id?+?""?});??
- ????????db.close();??
- ????????return?result;??
- ????}??
- ??
- ????/**?
- ?????*?刪除:?只需要寫where?條件(不帶where)?和?參數?
- ?????*??
- ?????*?@param?whereStr?
- ?????*????????????例如:?"id=?"?
- ?????*?@param?arr?
- ?????*????????????例如:?new?String[]?{?"123"?}?
- ?????*?@return?受影響的行?
- ?????*/??
- ????public?int?delete(String?whereStr,?String[]?arr)?{??
- ????????SQLiteDatabase?db?=?getWritableDatabase();??
- ????????int?result?=?db.delete(tableName,?whereStr,?arr);??
- ????????db.close();??
- ????????return?result;??
- ????}??
- ??
- ????/**?
- ?????*?清空表?
- ?????*/??
- ????public?void?clearTable()?{??
- ????????SQLiteDatabase?db?=?getWritableDatabase();??
- ????????db.execSQL("delete?from?"?+?tableName);??
- ????????db.close();??
- ????}??
- ??
- ????/**?
- ?????*?通用查詢,多用于事務中?
- ?????*/??
- ????public?static?Cursor?Query(SQLiteDatabase?db,?String?sql)?{??
- ????????System.out.println("==Query=="?+?sql);??
- ????????return?db.rawQuery(sql,?new?String[]?{});??
- ????}??
- ??
- ????/**?
- ?????*?通用執行sql,,多用于事務中?
- ?????*??
- ?????*/??
- ????public?static?void?execSQL(SQLiteDatabase?db,?String?sql)?{??
- ????????System.out.println("==execSQL=="?+?sql);??
- ????????db.execSQL(sql);??
- ????}??
- ??
- }??
- ??
- //-------------------------下面是一個具體實現的DEMO-------------------------------//??
- /**?
- ?*?dao類,實現基本的數據庫操作<br/>?
- ?*?需要保存到數據庫中的對象的屬性不能使用基本類型,建議只使用Integer?和?String<br/>?
- ?*?做為通用對象,從demo創建只要修改tableName即可?
- ?*??
- ?*?@author?yizhe?
- ?*?@date?2012-5-18?
- ?*/??
- public?class?NetTaskBufferDao?extends?DBHelper?{??
- ????int?expiryDays?=?10;?//?數據緩存有效期??
- ??
- ????public?NetTaskBufferDao(Context?context)?{??
- ????????super(context,?"NetTaskBuffer");??
- ????}??
- ??
- ????//?pojo的整數都需要使用Long類型?或者Integer類型?建議使用Long??
- ????public?void?iniContentValues(NetTaskBuffer?pojo)?{??
- ????????contentValues?=?new?ContentValues();??
- ????????contentValues.put("id",?pojo.id);??
- ????????contentValues.put("label",?pojo.label);??
- ????????contentValues.put("param",?pojo.param);??
- ????????contentValues.put("result",?pojo.result);??
- ????????contentValues.put("remark",?pojo.remark);??
- ????????contentValues.put("time",?pojo.time);??
- ????}??
- ??
- ????public?NetTaskBuffer?setBaseItem(Cursor?cursor)?{??
- ????????NetTaskBuffer?pojo?=?new?NetTaskBuffer();??
- ????????pojo.id?=?cursor.getInt(cursor.getColumnIndex("id"));??
- ????????pojo.label?=?cursor.getString(cursor.getColumnIndex("label"));??
- ????????pojo.param?=?cursor.getString(cursor.getColumnIndex("param"));??
- ????????pojo.result?=?cursor.getString(cursor.getColumnIndex("result"));??
- ????????pojo.remark?=?cursor.getString(cursor.getColumnIndex("remark"));??
- ????????pojo.time?=?cursor.getLong(cursor.getColumnIndex("time"));??
- ????????return?pojo;??
- ????}??
- ??
- ????//?--------------------自定義方法--------------------------------//??
- ????public?String?getBuffer(String?label,?String?param)?{??
- ????????String?sql?=?"select?*?from?"?+?tableName??
- ????????????????+?"?where?label=??and?param=??";??
- ????????NetTaskBuffer?obj?=?getOneAsSQL(sql,?new?String[]?{?label,?param?});??
- ????????if?(null?==?obj)?{??
- ????????????return?null;??
- ????????}??
- ????????Date?time?=?new?Date(obj.time);??
- ????????Calendar?c?=?Calendar.getInstance();??
- ??
- ????????c.add(Calendar.DAY_OF_MONTH,?-expiryDays);??
- ????????if?(time.compareTo(c.getTime())?<?0)?{??
- ????????????delete(obj.id);??
- ????????????return?null;??
- ????????}??
- ????????return?obj.result;??
- ????}??
- ??
- ????public?String?getBuffer(String?label,?String?param,?String?remark)?{??
- ????????String?sql?=?"select?*?from?"?+?tableName??
- ????????????????+?"?where?label=??and?param=??and?remark=?";??
- ????????NetTaskBuffer?obj?=?getOneAsSQL(sql,?new?String[]?{?label,?param,??
- ????????????????remark?});??
- ????????if?(null?==?obj)?{??
- ????????????return?null;??
- ????????}??
- ????????Date?time?=?new?Date(obj.time);??
- ????????Calendar?c?=?Calendar.getInstance();??
- ??
- ????????c.add(Calendar.DAY_OF_MONTH,?-expiryDays);??
- ????????if?(time.compareTo(c.getTime())?<?0)?{??
- ????????????delete(obj.id);??
- ????????????return?null;??
- ????????}??
- ????????return?obj.result;??
- ????}??
- ??
- ????public?void?deleteBuffer(String?label)?{??
- ????????String?whereSql?=?"?label=?";??
- ????????delete(whereSql,?new?String[]?{?label?});??
- ????}??
- ??
- ????public?void?deleteBuffer(String?label,?String?param)?{??
- ????????String?whereSql?=?"?label=??and?param=?";??
- ????????delete(whereSql,?new?String[]?{?label,?param?});??
- ????}??
- ??
- ????public?void?deleteBuffer(String?label,?String?param,?String?remark)?{??
- ????????String?whereSql?=?"?label=??and?param=??and?remark=?";??
- ????????delete(whereSql,?new?String[]?{?label,?param,?remark?});??
- ????}??
- ??
- ????//?--------------------基礎方法---------------------------------//??
- ??
- ????/**?
- ?????*?根據sql獲取list?
- ?????*/??
- ????public?ArrayList<NetTaskBuffer>?getListAsSQL(String?sql)?{??
- ????????SQLiteDatabase?db?=?getReadableDatabase();??
- ????????Cursor?cursor?=?db.rawQuery(sql,?new?String[]?{});??
- ????????ArrayList<NetTaskBuffer>?itemList?=?new?ArrayList<NetTaskBuffer>();??
- ????????for?(cursor.moveToFirst();?!(cursor.isAfterLast());?cursor.moveToNext())?{??
- ????????????itemList.add(setBaseItem(cursor));??
- ????????}??
- ????????cursor.close();??
- ????????db.close();??
- ????????return?itemList;??
- ????}??
- ??
- ????/**?
- ?????*?根據ID獲取一條記錄?
- ?????*/??
- ????public?NetTaskBuffer?getById(int?id)?{??
- ????????String?sql?=?"select?*?from?"?+?tableName?+?"?where?id="?+?id;??
- ????????return?getOneAsSQL(sql,?null);??
- ????}??
- ??
- ????/**?
- ?????*?返回結果中的提一條記錄?
- ?????*/??
- ????public?NetTaskBuffer?getOneAsSQL(String?sql,?String[]?arr)?{??
- ????????SQLiteDatabase?db?=?getReadableDatabase();??
- ????????Cursor?cursor?=?db.rawQuery(sql,?arr);??
- ????????try?{??
- ????????????if?(null?!=?cursor?&&?cursor.getCount()?>?0)?{??
- ????????????????cursor.moveToFirst();??
- ????????????????return?setBaseItem(cursor);??
- ????????????}??
- ????????}?finally?{??
- ????????????cursor.close();??
- ????????????db.close();??
- ????????}??
- ????????return?null;??
- ????}??
- ??
- ????/**?
- ?????*?保存對象到數據庫,自動判斷插入還是更像?
- ?????*??
- ?????*?@return?返回更新的記錄數,或者?插入數據的id,如果返回值<=0表示失敗?
- ?????*/??
- ????public?long?save(NetTaskBuffer?pojo)?{??
- ????????if?(null?==?pojo.time?||?0?==?pojo.time)?{??
- ????????????pojo.time?=?new?Date().getTime();??
- ????????}??
- ????????Long?idOrEffectRows?=?0l;??
- ????????if?(null?==?pojo.id?||?pojo.id?<?1)?{??
- ????????????idOrEffectRows?=?insert(pojo);??
- ????????}?else?{??
- ????????????idOrEffectRows?=?(long)?update(pojo);??
- ????????}??
- ????????return?idOrEffectRows;??
- ????}??
- ??
- ????/**?
- ?????*?添加數據,自動插入id?
- ?????*??
- ?????*?@return?the?row?ID?of?the?newly?inserted?row,?or?-1?if?an?error?occurred?
- ?????*/??
- ????public?long?insert(NetTaskBuffer?pojo)?{??
- ????????SQLiteDatabase?db?=?getWritableDatabase();//?獲取可寫SQLiteDatabase對象??
- ????????iniContentValues(pojo);?//?ContentValues類似map，存入的是鍵值對??
- ????????long?result?=?db.insert(tableName,?null,?contentValues);??
- ????????if?(result?!=?-1)?{??
- ????????????pojo.id?=?(int)?result;??
- ????????}??
- ????????db.close();??
- ????????return?result;??
- ????}??
- ??
- ????/**?
- ?????*?根據ID更新記錄的，跟插入的很像?
- ?????*??
- ?????*?@return?the?number?of?rows?affected?
- ?????*??
- ?????*/??
- ????public?int?update(NetTaskBuffer?pojo)?{??
- ????????SQLiteDatabase?db?=?getWritableDatabase();??
- ????????iniContentValues(pojo);?//?初始化鍵值對??
- ????????int?result?=?db.update(tableName,?contentValues,?"id=?",??
- ????????????????new?String[]?{?pojo.id?+?""?});??
- ????????db.close();??
- ????????return?result;??
- ????}??
- ??
- }??
安卓標準數據庫構建.zip?(9.2 KB)
轉載于:https://www.cnblogs.com/dongweiq/p/4045077.html
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