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I've talked about generating random passwords, so let's introduce some of the usual functions that generate random strings, these are our custom functions, and of course we have the system's own functions, but it's easier. Mt_rand function Example In this case, we will return some random numbers: The code is as follows Copy Code Echo (Mt_rand ());Echo (Mt_rand ());Echo (Mt_rand (10,100));?>The output is similar to:315090628851328967835 Let's take a loo

use the first 32 characters @ Tran_name_variableIs a user-defined variable name that contains a transaction name used to track distributed transactions in the ms dtc utility. The variable must be declared with the char, varchar, nchar, or nvarchar data type. NoteThe server that executes the begin Distributed Transaction statement is the transaction creator and controls the completion of the transaction. When the connection sends a subsequent commit transaction or rollback transaction state

is easy to understand, easy to use, and can be quickly mastered. Simple flipper Many games and game systems require dice. Let's start with the simple part: throw a six-sided dice. In fact, rolling a six-sided dice means selecting a random number from 1 to 6. In PHP, this is very simple: echo rand );. In many cases, this is basically simple. However, when dealing with probability games, we need some better implementations. PHP provides a better random number generator: mt_rand (). Without in-dep

25 Good PHP game programming script code sharing (1 ). A simple flipper many games and game systems need dice. Let's start with the simple part: throw a six-sided dice. In fact, rolling a six-sided dice is from 1 to 6. Simple flipper Many games and game systems require dice. Let's start with the simple part: throw a six-sided dice. In fact, rolling a six-sided dice means selecting a random number from 1 to 6. In PHP, this is very simple: echo rand );. In many cases, this is basically simple. Ho

Mt_rand functionExampleIn this example, we will return some random numbers: The code is as follows:Copy code Echo (mt_rand ());Echo (mt_rand ());Echo (mt_rand (10,100 ));?>The output is similar:315090628851328967835 Let's take a look at the mt_rand function instance. The code is as follows:Copy code Function roll (){Return mt_rand (1, 6 );}Echo roll ();Function

Simple Roll- dice Many games and game systems require dice. Let's start with a simple section: Throw a six-sided dice. In fact, scrolling a six-sided dice selects a random number from 1 to 6. In PHP, this is very simple: echo rand (1,6);. In many cases, this is basically simple. But in dealing with odds games, we need some better implementations. PHP provides a better random number generator: Mt_rand (). Without delving into the differences, you can

The script described in this article is easy to understand, easy to use, and can be quickly mastered.Simple flipperMany games and game systems require dice. Let's start with the simple part: throw a six-sided dice. In fact, rolling a six-sided dice means selecting a random number from 1 to 6. In PHP, this is very simple: echo rand );.In many cases, this is basically simple. However, when dealing with probability games, we need some better implementations. PHP provides a better random number gene

I have mentioned how to generate a random password. Next I will introduce some common functions for generating random strings. These are our custom functions. Of course, there are also built-in functions, however, it is relatively simple. Mt_rand Function Example In this example, we will return some random numbers: The Code is as follows: Copy code Echo (mt_rand ());Echo (mt_rand ());Echo (mt_rand (10,100 ));?>The output is similar:315090628851328967835 Let's take

backup pending and so on.This article mainly describes the COPY no/copy yes/nonrecoverable option provided by the DB2 LOAD command, and how to use the registry variables associated with it.Because the load minimizes log records, the database requires archived log features when restoring online backups, and for this database load operation, the table is using Rollforward after the load operation is not performed. When the command rolls forward to the archive log, it is placed in an unhealthy sta

-frequency oscillation, D is a restraining force, a large high-frequency oscillation, I is the static difference elimination force, the smaller the better, the larger will produce oscillation.2.1.3 Cascade PID Block diagramFig. 1 schematic diagram of Cascade PID controlTheory and calculation of 2.2 Euler's angleTheoretical analysis of Euler angle of 2.2.1In the 3D model, the most common method of rotation is four and Euler angles, which has the advantage of saving storage space and convenient in

, make the points scanned to the surface of the toner cartridges very small), the toner cartridges rotate in 1/300 inch or 1/600 inch steps, and the scan is performed in the next line. The toner cartridge is a cylindrical surface coated with organic materials, with a charge in advance. When there is light irradiation, the affected part will change the resistance. The data signals sent by the computer control the laser emission, and the light scanning on the surface of the toner cartridge is cons

gregoriancalendar (); currentdate. add (gregoriancalendar. date, mondayplus + 7); Date Monday = currentdate. gettime (); dateformat df = dateformat. getdateinstance (); string premonday = DF. format (Monday); Return premonday;} // obtain the date of Sunday next week. Public String getnextsunday () {int mondayplus = This. getmondayplus (); gregoriancalendar currentdate = new gregoriancalendar (); currentdate. add (gregoriancalendar. date, mondayplus + 7 + 6); Date Monday = currentdate. gettime (

default. if too much information is displayed above, we can use the GIT log-pretty = oneline command to demonstrate it as follows: Now I want to use the version rollback operation. I want to roll back the current version to the previous version. What command should I use? You can use the following two commands. The first one is GIT reset-hard head ^. If you want to roll back to the previous version, you o

not propagated within this method and in sub-methods that do not declare transactions6, never have a business to throw abnormal completely do not spread7. propagation_nested– If a transaction is currently present, it is executed within the nested transaction. If there is currently no transaction, do something similar to propagation_required.The first six policies are similar to EJB CMT, and the seventh (propagation_nested) is a special variable provided by spring.It requires a transaction manag

not roll back the operation. 3. Git index (git indexing) Git index can be thought of as a staging area between the working directory and the Git repository directory, and the staging area is the same meaning. You can use Git index to build a set of changes that you are ready to commit together. git index and Git Staging area are the same meaning, which refers to the areas where the content that has been add but not yet commit. The simplest way to s

occurs, this will roll back and throw an exception outside@Transactional (propagation = propagation.nested)public void Updateuserextbyid (String address, long ID) {Userdao.updateuserextbyid (address, id);int a = 1/0;}} In This example, the Updateuseragebyid transaction in UserService is declared as propagation.required, and the Updateuserextbyid method in Commonservice is called. And this method transaction is declared as propagation.nested. As expla

Add by Zhj: It seems that my understanding of MySQL has yet to be deepened, the water is still quite deep ah, MySQL to record lock, you can set the time-out through the innodb_lock_wait_timeout parameter,If the lock waits longer than this time, it will be rolled back, but there are two ways to roll back: the first: Rollback the current lock statement, and the second: Roll back the entire transaction. Both o

Label:The static of the Product Details page, varnish acceleration, seconds to kill the commodity library standalone deployment Server This is a little over. Only discuss the optimization of the inventory section MySQL configuration level of optimization can refer to my article "about MySQL InnoDB engine performance optimization of a little experience" The focus is on the database level. 2 Sheets: First: the scale (Buy_record), the user has no seconds to kill the product Fields: ID, uid, goods_i

Second kill core design (inventory reduction)-anti-overselling and high concurrency, inventory -- From: http://www.tuicool.com/articles/Bfa63e6Static product details page, varnish acceleration, second-kill product library independent deployment of servers this is skipped. Only the optimization of inventory is discussed.For mySQL configuration optimization, refer to my article "some experiences on mysql innodb engine performance optimization".Focuses on the database layer.Two tables:First: duplic

transaction has beenSubmit, but servicea. methoda will roll back in the next fail, and serviceb. methodb will also roll back 2: propagation_supportsIf the current transaction is running in the form of a transaction, if there is no longer a transaction, it will run in the form of a non-transactionThis is similar to the common non-transactional Code There is only one difference. Ignore this, because I do not