precalculus essentials

printing and so on operation; Extension=php_mbstring.dll--------Large character set, supports conversion between multiple character sets; Extension=php_mcrypt.dll; extension= Php_mysql.dll; Extension=php_mysqli.dllRemove the semicolon and set up the DLL module that needs to be loaded. The above are basically to be removed.The difference between the wamp and the lamp environment is that the system loads the DLL files in PHP in different ways,And the combination of Apahce and PHP, window under an

that you need to re-enter the same data for all the rows once and reduce the efficiency! Update can simplify this problem!Knowledge Point 2UPDATE---Change the value of a single column or all columns (without the where it will modify all the data in that column to the new value)UPDATE My_foods SET = ' Bread 'If you need to update a single row or multiple rows, everything needs to be given to where to decideUPDATE my_foods ---Select the updated table set='bread' --set the value of the column wh

, unique index, full-text index, normal index, composite index]php operation MySQL: PHP transformation Client, open the extension, typical extension (mysql,mysqli,pdo-mysql), Libmysql.dll (Connection service provider), check whether MySQL is loaded (PHPinfo), PHP operation MySQL (connection authentication mysql_connect (), prepare and send SQL statement mysql_query, Process execution Results mysql_ Fetch_assoc (), releasing the resource [result set], closing connection mysql_close ()), mysql_que

: generally include the system kernel optimization, MySQL itself configuration file optimization. 16. mysql efficient architecture read/write separation configurationwith the increasing number of visits, based on the original MySQL master-slave architecture, all operations are done in the Lord, which will inevitably cause the main server pressure is very large, so in order to reduce the master read and write, we need to read and write, separate the architecture is: The Lord is responsible for wr

(2)IP link Show Show link status of all interfacesMii-tool eth0 Show link status of ' eth0 'Ethtool eth0 Show statistics of the network card ' eth0 'Netstat-tup Show all active network connections and their PIDNETSTAT-TUPL Show all network services listening on the system and their PIDTcpdump TCP port Show all HTTP trafficIwlist Scan Show Wireless networksIwconfig eth1 Show configuration of a wireless network cardHostname show hostnameHost www.example.com lookup hostname to resolve name to IP a

named.6: Details and other bug optimizationsMaybe the age is too long, forget, don't want to ... Ready to have lunch ...Other:1: Previous other features introduced, see: DBImport v3.3 Chinese Release: Database data interoperability and document generation tools (IT staff required)2::http://www.cyqdata.com/download/article-detail-425173: Send some benefits: can take a few likes to my buckle in exchange for a registration code, only valid today.DBImport v3.44 Chinese Release: Database data intero

777./config/[Email protected] bbs]# chmod-r 777./data/[Email protected] bbs]# chmod-r 777./uc_client/[Email protected] bbs]# chmod-r 777./uc_server/Three: Restart Nginx service[[Email protected] bbs]# service Nginx restartFour: Verify:Win7 Browser access: http://192.168.80.40/bbs/install/index.php//Installation ForumNext:Installation CompleteAccess Address: http://192.168.80.40/bbs/index.phpValidation successfulhttp://192.168.80.40/bbs/admin.php Management BackgroundEnter account number, passwo

the performance point of view the second is obviously more time-saving. 4: Note the difference between the ON clause and the WHERE clause The code is as follows: SELECT * FROM product left JOIN Product_details On (product.id = product_details.id) and product_details.id=2; SELECT * FROM product left JOIN Product_details On (product.id = product_details.id) WHERE product_details.id=2; The first query uses the on condition to determine that all rows of data that are compliant are retrieved from th

/8F/A6/wKiom1jnY4uiqu_kAAAiRR3kfAg764.jpg-wh_500x0-wm_ 3-wmp_4-s_1105899805.jpg "title=" 36020170407175711659.jpg "alt=" Wkiom1jny4uiqu_kaaairr3kfag764.jpg-wh_50 "/>systemctl Set-default multi-user.target # #开机不开启图形650) this.width=650; "Src=" https://s5.51cto.com/wyfs02/M00/8F/A7/wKiom1jnY7LSheZMAAAgY1XBteo325.jpg-wh_500x0-wm_ 3-wmp_4-s_2779274314.jpg "title=" 36020170407175718927.jpg "alt=" Wkiom1jny7lshezmaaagy1xbteo325.jpg-wh_50 "/>systemctl Set-default graphical.target # #开机启动图形650) this.wid

run FG: Suspend program jobs: Show background programKill,Killall, Pkill: Kill process crontab: Set timingPS: View process pstree: Show process status Tree top: Show Process Nice: Change priority nohup: The user will continue to work after exiting the system pgrep: Finding a process that matches a condition Strace: Tracing the system call of a process ltrace: tracing the situation of a process call library function Vmstat: Reporting virtual Memory statistics dangerous system commands:MV RM DDfd

jump selection Ctrl+f5Global Debug Last started F11Global Continue F8Global use filters to step SHIFT+F5Global Add/Remove breakpoints Ctrl+shift+bGlobal Display Ctrl+dGlobal Run last boot ctrl+f11Global Run to row ctrl+rGlobal Execution Ctrl+uRefactoringscope function Shortcut keysGlobal Undo Refactoring Alt+shift+zGlobal Extraction Method Alt+shift+mGlobal decimation local variable alt+shift+lGlobal inline Alt+shift+iGlobal Mobile Alt+shift+vGlobal Rename Alt+shift+rGlobal Redo Alt+shift+ySour

program calls the library in each operating system exists. system call (Library of wheat):systemcall API(Steamed bread Library): Advanced Call11. Kernel Function: Process Management Memory Management File System Network functions Hardware Drivers Security Mechanisms12, the basic principles of Linux:1, consisting of a small program with a single purpose; a combination of small procedures to complete complex tasks;2, all documents;3, try to avoid capturing the user interface;4, the configuration

unexpected exit. The ApplicationContext uses Examples of annotation ways:@Aspect @componentpublic class Loginterceptor {@Pointcut ("Execution (public * com.bjsxt.service). *.add (..)) ") public void MyMethod () {}, @Before ("MyMethod ()") public void before () {System.out.println ("method before");} Output:Method beforeMethod around StartUser saved!Method around EndMethod afterExamples of XML methods:Common annotation:A) @Pointcutb) @Beforec) @AfterReturningD) @AfterThrowinge) @Afterf) @AroundC

done Tell me about your development process. How do you communicate with the team? How do you conduct code reviews Tell me about your understanding of technology and business. Tell me about the Exception you often encounter in the project. Tell me about the hardest bug you've encountered in the project, how to solve it. Tell me about your deepest impression in the project and how to solve it. What do you think is the problem with your project? Have you ever e

growth.Variables are changed and other threads can immediately know. There are several ways to ensure visibility: Volatile Variables added to the volatile keyword will be compiled with a lock prefix directive, which is equivalent to a memory barrier, the memory barrier can guarantee the order of memory operations. When a variable declared as volatile is written, the variable needs to write the data to main memory.Because the processor implements the cache consistency protocol, wri

not break the line. Putchar (' A ');p Utchar (60);GetChar character input function, only one character can be accepted. You can make a space, tab, carriage return line break. When you read the carriage return line break, you need to hit the ENTER key 2 times. 4) String processing function:Strlen ():measure the number of characters in a string, not including theintsize1=strlen(S1);//length is 3strcpy (), copy the string into the character arraychar s[10];strcpy(s,"lmj");strcat (), string concat

) SIGRTMAX-2 6, Common signal 1) SIGHUP 1--suspend detection of the control process and terminal; 2) SIGINT 2--Press CTRL + C to send a signal 3) SIGKILL 9--strong kill Process 4) SIGTERM 15--default to terminate process 5) SIGTSTP 20--Press CTRL + Z to send a signal 7, kill process by process name [email protected] ~]$ Killall-9 suSu:no process killed 8, capturing and responding to a signal test trap[email protected] ~]$ Cat singlehandle.sh | Sed '/^$/d '#!/bin/bashfunction handler (){Echo Hey,

the best fit for you.The Nano shortcuts available are shown below the user interface, and the Nano has only the functionality of the most basic text editing software. It is very compact and is ideal for editing system configuration files. For those who do not need complex command-line editing capabilities, the Nano is perfectly equipped.What do you think?Here are some other editors I'd like to mention: the Nice editor (NE): The official website says: "If you have enough information, you have th

grown:Private Boolean journalrebuildrequired () {final int redundantopcompactthreshold = 2000; return redundantopcount >= redundantopcompactthreshold// redundantopcount >= LRUENTRIES.SIze (); }Some operations traverse Valuecount, a value that represents multiple caches under the same key, such as a picture that can be divided into large and small, which is valuecount.(The code is derived from the Lrudiskcache in Xutils, which is clearly more complete than the Disklrucache in the Android website

peripherals and install device drivers (such as network cards)5. Familiar with the Grub/lilo guide and simple repair operation.6. Familiar with Linux file system and directory structure.7. Master Vi,gcc,gdb and other common editors, compilers, debuggers.8. Understand shell aliases, pipelines, I/O redirection, input and output, and shell scripting.9. Learn about networking in a Linux environment.The above is the author to learn some of the Linux experience, I hope you have some help.Transferred