sql ContentProvider中的多表查询

 /**
         * 多表查询
         * @param companyId 根据公司id查询
         * @return
         */
        public  ArrayList<MenuItemModel> queryMultiTable(String companyId) {
                //projection代表查询结果返回的列
                String[] projection = {
                                "menutreeitems." + MenuTreeItemsModelIds.ITEMID,
                                "menutreeitems." + MenuTreeItemsModelIds.COMPANYID,
                                "menutreeitems." + MenuTreeItemsModelIds.DESCRIPTIONS,
                                "menutreeitems." + MenuTreeItemsModelIds.FILEID,
                                "menutreeitems." + MenuTreeItemsModelIds.ISDELETED,
                                "menutreeitems." + MenuTreeItemsModelIds.ITEMTYPE,
                                "menutreeitems." + MenuTreeItemsModelIds.NAME,
                                "menutreeitems." + MenuTreeItemsModelIds.PARENTITEMID,
                                "menutreeitems." + MenuTreeItemsModelIds.ROWVERSION,
                                "filedetails." + BaseColumns._ID,
                                "filedetails." + FileDetailsIds.EXTENSION,
                                "filedetails." + FileDetailsIds.FILE_NAME};
                //在这里多表查询的URI是重点CONTENT_URI（当前表的URI）          
　　　　　　　　　　//"filedetails"(代表另一张表的表名)
　　　　　　　　　　// content://athority/table1/table2 
                Uri uri = Uri.withAppendedPath(CONTENT_URI, "filedetails");

                Cursor c = null;
                ContentProviderClient client = mContentResolver.acquireContentProviderClient(MuliTableContentProvider.AUTHORITY);
                try {
                        c = client.query(uri, projection, MenuItemModelIds.COMPANYID+"="+companyId, null, null);
                        
                } catch (RemoteException e) {
                        e.printStackTrace();
                }
                //创建ArrayList用来存放数据
                ArrayList<MenuItemModel> dataList = new ArrayList<MenuItemModel>();
                //将指针移动到第一行
                c.moveToFirst();
                while(!c.isAfterLast()){
                        String itemId = c.getString(c.getColumnIndex(BaseColumns._ID));
                        String parentItemId = c.getString(c.getColumnIndex(MenuTreeItemsModelIds.PARENTITEMID));
                        String name = c.getString(c.getColumnIndex(MenuTreeItemsModelIds.NAME));
                        String descriptions = c.getString(c.getColumnIndex(MenuTreeItemsModelIds.DESCRIPTIONS));
                        String fileId = c.getString(c.getColumnIndex(MenuTreeItemsModelIds.FILEID));
                        String itemType = c.getString(c.getColumnIndex(MenuTreeItemsModelIds.ITEMTYPE));
//                        String companyId = c.getString(c.getColumnIndex(RoomAndTableTreeItemsModelIds.NAME));
                        String rowVersion = c.getString(c.getColumnIndex(MenuTreeItemsModelIds.ROWVERSION));
                        String isDeleted = c.getString(c.getColumnIndex(MenuTreeItemsModelIds.ISDELETED));
                        
                        String fileName = c.getString(c.getColumnIndex(FileDetailsIds.FILE_NAME));
                        
                        
                        MenuItemModel model = new MenuItemModel();
                        model.setItemId(itemId);
                        model.setParentItemId(parentItemId);
                        model.setName(name);
                        model.setDescriptions(descriptions);
                        model.setFileId(fileId);
                        model.setItemType(itemType);
                        model.setRowVersion(rowVersion);
                        model.setIsDeleted(isDeleted);
                        model.setFileName(fileName);
                        dataList.add(model);
                        c.moveToNext();
                        }
                
                
                        c.close();        
                        return dataList;
        }