Python, angular JS learning record "3"

1.Alembic is a Python database migration tool written by sqlalchemy authors. It enables synchronous updates of model classes and databases. (Installation and operation steps using Alembic Migration database)

To add a database field Operation process using Alembic:
Switch to the Db_migrate directory
(1). Add content to model.py
(2). Run Alembic revision--autogenerate-m "comment content" to build a database migration file
(3). Run Alembic upgrade head to update the contents of the migrated file to the database

2.liunx command (see linux System hardware configuration for details)

(1) View CPU

grep "model Name"/proc/cpuinfo | Cut-f2-d:

(2) View memory

grep Memtotal/proc/meminfo | Cut-f2-d:

(3) View the current version of Linux

Cat/etc/redhat-release

(4) View kernel version

Uname-a

(5) View Ip,mac address

Ifconfig

View Gateway

Cat/etc/sysconfig/network

View DNS

Cat/etc/resolv.conf

3.angularjs, if you want to manipulate the DOM element, the most appropriate way is to add instructions on the DOM, on the one hand can be used in multiple places, on the other hand, the instruction is done after the element is loaded, to ensure that the element must exist.

Will

// drawpage ($scope, $http, 1,util);

Transformed into

<id= "Main_client_order"  clientorder></  div>

function Clientorder (Util, $http) {        return  {            ' A ',            function  ($ Scope, element, attrs) {                drawpage ($scope, $http,1, Util);}}        ;    

Because in the Drawpage method, there is an operation to replace the element

function Drawpanel (ScreenWidth, screenheight) {            = d3.select (' #main_client_order ')                . Append (' SVG: SVG ')                . attr (' width ', screenwidth+100).                attr (' height ', screenheight+100)                . Style ("Margin-left", "20px")                . Style ("Margin-top", "20px")                . attr ("id", " OrderId ");             = svg;        }

4. Database associated with the field, first of all to consider whether in the model through the method and other content to obtain, if possible, add it. On the one hand, the maintenance of the added field after the deletion of the modification, on the other hand, the full use of SQLAlchemy function.

model.py

class Clientgroup (Base):     __tablename__ ' Clientgroup ' = Column (String (255))    def  Client_count (self):        return       Thinclient.query.filter_by (group_id=self.id). Count ()

serializer.py

class Clientgroupserializer (Schema):     = fields. Function (Lambda  c:c.client_count ())    class  Meta:        = All_fields ( Clientgroup) +['client_count']

The page gets as follows:

< TD > {{Group.client_count}} </ TD >

5.angularjs when the class name or method name is the parameter of the processing method:

(1) class names and method names are parameters

var resource = $scope.  case?  function  (data) {                 },function(e) {                            })

(2) method name is parameter

var fun_name = "Add"function  (data) {                 },function(e) {                            })

Python, angular JS learning record "3"