otn meaning

Often used when connecting db, just do not know what the meaning of the representative ... Often used when connecting db, just do not know what the meaning of the representative ... Rs. OPEN sql,conn,a,b A: adOpenForwardOnly (=0)Read-only and the current data record can only move Down adOpenKeyset (=1)Read-only, the current data record is free to move adOpenDynamic (=2)Can read and write, the current d

1, the meaning of the reference References 变量别名 exist, so in some cases you can substitute pointers for better readability and usability relative to pointers The implementation of the SWAP function is compared to void swap (int A, int b) { int t = A; A = b; b = t;} void Swap (int* A, int* b) { int t = *a; *a = *b; *b = t;} Note: The reference parameter in the function does not need to be initialized, and initialization is done

Article Source: Linux average load average meaningThe meaning of load averageThe average payload (load average) refers to the average utilization of the operating queue of the system, or it can be considered as the average of the operational processes .In the case of road conditions, single-core CPUs and single-lane situations are as follows: The numbers between the 0.00-1.00 indicate that the traffic is very good at this time, without conge

Tags: symbol GPO script conditional expression string meaning BSP nbsp DashFile expression-e filename true if filename exists-d filename If filename is a directory, true-F filename True if filename is a regular file-L filename True if filename is a symbolic link-r filename If filename is readable, true-W filename if filename is writable, true-x filename If filename is executable, true-S filename true if the length of the file is not 0-H filename True

Tags: file run BSP case background POS linux lis Linux The meaning of shell variable $#,[email protected],$0,$1,$2 in Linux is explained:Variable Description:$$The PID of the shell itself (ProcessID)$!PID of the Shell's last running background process$?End code of the last Run command (return value)$-Flag at a glance using the SET command$*All parameter lists. such as "$*" in the Case of "" ", in the form of" $ $ ... $n "output all par

SliceStr[start:end:step]Start: Starting from xxx (startswith)End: Cut to XXX (EndsWith) not included. Capitalize () #首字母大写. Title () #标题, capitalize the first letter of each word (special characters, Chinese is also considered special characters here). Upper () #转换成大写字母. Lower () #全部成小写. Swapcase () #大小写转换. Center (value) is elongated to 10 characters, filled by *. Strip () #去掉左右两边空格. Lstrip () #去掉左边空格. Rstrip () #去掉右边空格. replace () # replacement. Split () #切割. Count () #数数. Find () #查找. Index (

))) { JoinToQuartz(type, DateTimeOffset.Now); }}});//Start monitoring.watcher.EnableRaisingEvents = true;LogThe log frame differs from the previous Lind framework in that it only moves the object's life cycle to the DI container for unified management, using a single-case approach, and the current log framework providesSupport for log4net, while lightweight logs can be implemented using Lindlogger.services.AddLog4Logger(o =>{o.Log4ConfigFileName = "log4.config";o.ProjectName = "test

The essence is to find the integer multiples of the $d, starting at twice times $d.$list [$i]=0;//divide the divisible multiples into 0 processing}}}Extracts the value of the element in the entire array to 1foreach ($list as $key = = $value) {if ($value = = 1) {echo $key. ' }}}?>The above is the implementation of screening!!!Two algorithms for finding prime numbers:(1) by dividing "to achieve circular division, only the method of controlling the maximum divisor" to achieve the prime number(2) S

Abnormal Describe Nameerror Try to access a variable that is not declared Zerodivisionerror Divisor is 0 SyntaxError Syntax error Indexerror Index out of sequence range Keyerror Request a dictionary keyword that does not exist IOError Input/output error (e.g. the file you want to read does not exist) Attributeerror Attempting to access an unknown object

change the login shell within the scope specified in this file. Provide aThe service process of the Machine FTP service FTPD checks whether the user shell is listed in the/etc/shells file, and if not, the user will not be allowed to log on./ETC/TERMCAP: Terminal performance database. Describes what "escape sequence" controls are used by different terminals. No direct output escaping when writing programsSequence (this works only with a particular brand of terminal), but instead looks for the co

The Linux kernel is written in C, but the Linux kernel is not called an operating system, and the kernel only provides basic device drivers, file management, resource management, and so on. Is the core component of the Linux operating system, the Linux kernel can be widely shifted, and also applicable to a variety of hardware.The Linux kernel version has both stable and development versions. The Linux kernel version number typically consists of three-bit numbers, such as the 2.6.18 kernel versio

Variable Description:$$The PID of the shell itself (ProcessID)$!PID of the Shell's last running background process$?End code of the last Run command (return value)$-Flag at a glance using the SET command$*All parameter lists. such as "$*" in the Case of "" ", in the form of" $ $ ... $n "output all parameters.[Email protected]All parameter lists. such as "[email protected]" with "" "in the case, with" $ "" $ "... All parameters are output in the form "$n".$#Number of arguments added to the shell$

Http://kodango.com/useful-documents-about-shell$$ the shell itself PID (ProcessID)$! PID of the Shell's last running background process$? The return value of the last command that was run to check whether the previous command executed successfully.$* all parameter lists, as a whole.[email protected] all parameter lists. Alone as a whole.$# the number of arguments added to the shell.The file name of the Shell itself."Shell Learning Notes" $#,[email protected], explaining the

The compiler compliance setting tells the compiler to pretend it ' s a different version of Java.The Java 8 compiler would produce class files in the Java 8 version of the class file format, and accept Java 8 source file S. JRE 6 can ' t load this version, because it is created after JRE 6 is.If you set the compliance level to "JRE 6", it would instead compile Java 6 source files into Java 6 class files.It's like saving a Word document as "word 97-2003 format"-so that word 97-2003 can read your

The execution name of this program$n the nth parameter value of this program, n=1..9$* all parameters of this program, this option can have more than 9 parameters.$# the number of parameters for this program$$ the PID of this program (the current process ID number of the script run)$! PID of the previous background instruction (process ID number of the last process running in the background)$? Executes the return value of the previous instruction (displays the exit status of the last command. 0

restore it.B. Want to make the user name shorter.Method: Create a new User: sudo adduser yy (yy means your new username)Enter the password for your root user.Then enter the password for your new user xxxAfter the full name, room number, telephone, etc. do not need to fill in.So you create a new user, directly with this user can be.C Delete the original usersudo userdel zzz (zzz means your original username) If your user is logged in, you need to exit. Otherwise it cannot be erased.The

now.W S Process state. (d= non-disruptive sleep status, r= run, s= sleep, t= track/Stop, z= zombie process)x command name/command lineY Wchan If the process is sleeping, the system function name in sleep is displayedZ Flags task Flag, reference sched.hBy default, only the more important PID, USER, PR, NI, VIRT, RES, SHR, S,%cpu,%MEM, time+, and COMMAND columns are displayed. You can change the display by using the following shortcut keys.The F key allows you to select what is displayed. Press t

Public classTest { Public Static voidMain (string[] args) {//under normal circumstances, the corresponding ASCII code is stored in the 0,TP . CharTP = ' 0 '; System.out.println ((int) TP); //added \ means that the following 0 is an escape character, for special handling, this escape means that 0 is not the same as the original character 0, when the compiler encounters this, it will automatically//conversion to decimal 0 is stored in CH, and the characters in the ASCII code corresponding t

Note: This article is reproduced in the networkThe man in Linux is very powerful, and the manual is divided into sections, which can be used to specify a different section to navigate, with each section having the following meanings:1-commands2-system calls3-library calls4-special files5-file formats and Convertions6-games for Linux7-macro Packages and conventions8-system Management Commands9-OtherExplain,1 is a normal command.2 is a system call, such as open,write (through this, at least can be

EOF is a macro, which is generally defined as-1.1.EOF is used to determine the end of the document (end of file) in the file operation, you can check MSDN to see its definition: EOF is returned by an I/O routine when the end-of-file (or in some CA SES, an error) is encountered2.EOF indicates the end of the input stream.3. After the send-side socket is closed, the read function of the receiving end reads the socket will also return EOF.The meaning of E