unique string

As a programmer, the database design before programming is very important, which will be directly related to the subsequent coding work. Here we will talk about some details about the database design process. 1. Select fields (ID, code, number) for

Key Generator primary Key Generator the element is used to set the identifier generator. Hibernate provides the identifier Generator interface org. hibernate. id. IdentifierGenerator, and provides multiple built-in implementations. For example, org.

PHP randomly generates a unique HASH value User-Defined Function, phphphash User-Defined Function There are many ways to obtain random and unique HASH values on the Internet, but they are similar: 1. Obtain random and unique strings first2.

Android access Android Wear Data layer Api -- synchronize Data Items Data Items is a Data interface used to synchronize mobile phones and wear. A Date Items usually includes the following parts: Payload In a byte array, you can set any data type

Android inheritance DialogFragment dialog box 2, androidfragment Previously I wrote an article about Android inheritance DialogFragment pop-up dialog box 1. This time I modified some things based on the previous one, that is, how to get getDialog ()

After reading the article "using hibernate to implement infinite classification of tree structures, I also want to share with you the implementation method of the function module tree used in all development projects and the complete DEMO (including

UUID (Universally Unique Identifier) and GUID are all Unique identifiers in the whole time and space range. This is necessary in a distributed computing environment. however, if you only want to generate a "local unique identifier" in a limited

The gdal library contains the reading and writing of raster data, the reading and writing of vector data, and the related algorithms of raster and vector data. The following describes the architecture of grid data and vector data in gdal. I am very

    It is easy to understand. The ID of the cookie-saved shopping cart and the data of the DB-saved shopping cart. Code for generating a shopping cart sessionIf (! $ Session &&! $ SCID ){/*Session is used to differentiate each shopping cart, which

Android basic notes (18)-Fragment, androidfragment Blog sentiment end-start What is Fragment? Add fragment to Activity in two ways Fragment Lifecycle Fragment backward compatibility Communication between Fragment Blog sentiment, end

What you need to know, useful Python functions and features, python features After using Python for many years, I accidentally discovered some features that we did not know in the past. Some of them can be said to be very useful, but they are not

[Android UI design and development] 4. Fragment introduction and simple implementation on the menu bar at the bottom (I), androidfragment TabActivity has been completely deprecated since Android4.0 and replaced by Fragment. Fragment is a new concept

Android UI programming (7) -- Fragment, androidfragment Fragment is a part of the Activity interface or an action. You can combine multiple Fragment members into an Activity to create a multi-faceted interface and reuse one Fragment in multiple

Hibernate knowledge point sorting1. Requirements for persistence objects 1) provide a non-argument constructor 2) provide an identity attribute, such as id, which is usually mapped to the primary key field of the database table. 3) provides get and

Android Intent Filter analysis, androidintent In Activity and Service, Intent represents a request to execute actions on a dataset. Intent Filter declares that a specific application component can operate on a type of data. To register an Acitivty

OC, oc Language I. Basic syntax 1> OC language and C Language C is a process-oriented language, and OC is an object-oriented language. The OC language inherits the C language and adds the object-oriented idea. The following describes only

Android inheritance DialogFragment dialog box 1 and androiddialog I believe that Android software developers often use this pop-up dialog box. Android inherits DialogFragment. the dialog box "dialog" is displayed, which can be used to flexibly

Public Account development tutorial, public development tutorial Development and debugging tips The development of public accounts is simple and troublesome. It is not a development process, but a development environment. As the saying goes, it is

JavaScript -- Item5 global variable that you don't know1. Use as few global objects as possible The problem with global variables is that your JavaScript Application and all the code on the Web page share these global variables. They live in the

C ++ Primer study note _ 102 _ special tools and technology, primer_102Special tools and technologies-runtime type Identification [continued]  Iii. Use of RTTI When comparing two derived class objects, we want to compare data members that may be