android輕量級無侵入式管理數據庫自動升級組件

2023.2.14 完成SQLiteOpenHelper 
2023.2.23 完成room
2023.2.25 完成架構重構
2023.2.26 新增架構設計圖說明

    implementation 'com.google.code.gson:gson:2.8.9'
    implementation "androidx.room:room-runtime:2.0.0"
    annotationProcessor "androidx.room:room-compiler:2.0.0"

    //1.直接創建SQLiteOpenHelper
    SpeSqliteOpenHelperService.getInstance(this);
    //2.創建SQLiteOpenHelper且需要監聽db
    SpeSqliteOpenHelperService.getInstance(this, new SpeSqliteBaseInterface() {
      @Override
      public <T> void onCreate(T db, RoomDatabase room) {
               
      }
      @Override
      public <T> void onOpen(T db, RoomDatabase room) {
                                 
      }
      @Override
      public <T> void onUpgrade(T db, int oldVersion, int newVersion, RoomDatabase room) {
                                                    
       }
    });                                                                                                                                                                                                                                                                                                                                                                       

    //3.直接創建room
        SpeSqliteRoomService.getInstance(this,AppDatabase.class);
    //4.創建room，且需要監聽db
        SpeSqliteRoomService.getInstance(this,AppDatabase.class,new SpeSqliteBaseInterface() {
            @Override
            public <T> void onCreate(T db, RoomDatabase room) {
                //TODO  刪除測試插入代碼
                if(room != null){
                    ServerModel model = new ServerModel();
                    model.setId("1");
                    model.setHost("1");
                    model.setLang("1");
                    model.setName("1");
                    model.setVersion("1");
                    insert(room,model);
                }

            }
            @Override
            public <T> void onOpen(T db, RoomDatabase room) {

            }

            @Override
            public <T> void onUpgrade(T db, int oldVersion, int newVersion, RoomDatabase room) {

            }
        });        

  /**
     * 數據庫第一次創建時的調用函數
     * @param db db
     */
    public void create(SQLiteDatabase db){
        SpeSqliteSettingModel currentDBModel = SpeSqliteUpdateManager.getInstance().currentAppDBSetting();
        for(int i=0;i<currentDBModel.dbTables.size();i++){
            SpeSqliteTableSettingModel table = currentDBModel.dbTables.get(i);
            String sql = " create table if not exists "+table.tableName+" (";
            for(int j=0;j<table.columns.size();j++){
                SpeSqliteColumnSettingModel column = table.columns.get(j);
                sql+=column.key+" ";
                sql+=column.keyType;
                if(j==table.columns.size()-1){
                    sql+=" ";
                }else {
                    sql+=",";
                }
            }
            sql+=")";
            executeSQL(db,sql);
        }
        //SQLiteDatabase數據庫才需要升級本地數據配置
        if(db instanceof SQLiteDatabase){
            SQLiteDatabase _db = (SQLiteDatabase)db;
            updateConfig2DB(_db,currentDBModel);
        }
    }

    /**
     * 升級數據庫，此處涉及3種改動：1.新建表 2.老表新增字段 3.刪除表
     * 註意該方法會被兩個數據庫依次觸發，所以需要控制
     * 1.新建表的處理思路：比較簡單直接create即可
     * 2.老表新增字段需要遍歷db中的json表字段明細和當前app中的json明細
     * @param db db
     */
    public  void upgrade(SQLiteDatabase configdb,SupportSQLiteDatabase db){
        SpeSqliteSettingModel newConfig = this.currentAppDBSetting();
        SpeSqliteSettingModel localConfig = this.getAppLoclDBSetting(configdb);
        //該處判斷可以不要，但是加瞭後(daupdate.json的dbversion字段)效率更高
        if(localConfig.dbVersion< newConfig.dbVersion){//通過dbversion直接判斷是否要升級
            //防止room數據未創建表,就alter
            if(db != null){
                for(int i=0;i<localConfig.dbTables.size();i++) {
                    SpeSqliteTableSettingModel _local = localConfig.dbTables.get(i);
                    createTableSQL(db,_local);
                }
            }
            for(int j=0;j<newConfig.dbTables.size();j++){
                SpeSqliteTableSettingModel _new = newConfig.dbTables.get(j);
                for(int i=0;i<localConfig.dbTables.size();i++){
                    SpeSqliteTableSettingModel _local = localConfig.dbTables.get(i);
                    if(_local.tableName.equals(_new.tableName)){//找到，再判斷字段是否有新增
                        _local.indexed = true;//被比較過,該表不用刪除
                        if(_local.columns.size()<_new.columns.size()){
                            //執行alert去新增字段 //
                            alterCoulmns(db != null?db:configdb,_local,_new);
                        }
                        break;//隻要匹配到就直接跳出該層循環
                    }
                }
                //本地數據沒找到這個表需要新增
                createTableSQL(db != null?db:configdb,_new);
            }
            //針對被廢棄的表需要在本地庫中刪除
            for(int i=0;i<localConfig.dbTables.size();i++){
                SpeSqliteTableSettingModel table = localConfig.dbTables.get(i);
                if(!table.indexed){
                    dropTables(db != null?db:configdb,localConfig.dbTables.get(i));
                }
            }
            //隻有當是SQLiteDatabase升級時才能本地數據配置
            if(db == null){
                updateConfig2DB(configdb,newConfig);
            }
        }
    }

    /**
     * 移除老表
     * @param db db
     * @param table table
     * @param <T> 范型（需考慮SQLiteOpenHelper和room）
     */
    private <T> void dropTables(T db,SpeSqliteTableSettingModel table){
        String sql = " DROP TABLE IF EXISTS "+table.tableName;
        executeSQL(db,sql);
    }

    /**
     * 老表新增字段
     * @param db db
     * @param _old 老表字段配置
     * @param _new 表新字段配置
     * @param <T> 范型（需考慮SQLiteOpenHelper和room）
     */
    private <T> void alterCoulmns(T db,SpeSqliteTableSettingModel _old,SpeSqliteTableSettingModel _new){
        for(int i=0;i<_new.columns.size();i++){
            if(i>=_old.columns.size()){
                SpeSqliteColumnSettingModel column = _new.columns.get(i);
                String sql = " alter table "+_old.tableName+" add column ";
                sql+=column.key;
                sql+=" ";
                sql+= column.keyType;
                executeSQL(db,sql);
            }
        }
    }

    /**
     * 新增表
     * @param db db
     * @param table 表配置
     * @param <T> 范型（需考慮SQLiteOpenHelper和room）
     */
    private <T> void createTableSQL(T db,SpeSqliteTableSettingModel table){
        String sql = " create table if not exists "+table.tableName+" (";
        for(int j=0;j<table.columns.size();j++){
            SpeSqliteColumnSettingModel column = table.columns.get(j);
            sql+=column.key+" ";
            sql+=column.keyType;
            if(j==table.columns.size()-1){
                sql+=")";
            }else {
                sql+=",";
            }
        }
        executeSQL(db,sql);
    }