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The detailed usage of the linux-chmod_ command is explained

option is used in the command, so he is able to read the shiyan1.c file (although this file is set toOther people do not have any permissions), this is the function of S.Therefore, in the whole system, especially the root itself, it is best not to set this type of file too much (unlessnecessary) This will ensure the security of the system and avoid the intrusion of the system due to bugs in some programs.chmod a–x Mm.txtChmod–x Mm.txtchmod ugo–x Mm.txt% of these three commands is to delete the

MySQL stored procedures Explained

output parameter.First create a procedure with an output parameter CREATE PROCEDURE Demosp (out Inoutparam varchar (50))BEGINSet inoutparam = "Hello procedure";END It is then called in Java. CallableStatement cstmt = Conn.preparecall ("{Call DEMOSP (?)}");Cstmt.registeroutparameter (1, Java.sql.Types.VARCHAR);Boolean i = Cstmt.execute (); String x = cstmt.getstring (1);SYSTEM.OUT.PRINTLN ("Call Result:" +i+x); It is obvious that a registerou

Mongdb_crud_ Simple that example explained

automatically inserts a unique field as the primary key3, Data deletionNOSql:db.user.remove ({sex:1});Split:1. Confirm that the database data collection performs the operation2,criteria Standard condition {sex:1}Sql:delete user WHERE sex = 1;Note: Delete the operating room Delete all data documents that meet the criteria; if we want to delete only one document record that satisfies the criteria, challenge set option4, Data Update:NOSql:db.user.update ({age:{$gt: 18}},{$set: {sex:2}},{multi:true

MySQL Engine explained

)Support for foreign keysSupport Row lockSupport TransactionsDual License: GPL and commercial licenseIdeal for environments with a high number of update and insert operations, higher concurrent QPS ( query rate per second )To view the database engine:View now available storage engine: mysql> show engines;View current default storage engine: mysql> show variables like '%storage_engine% ';See what engine is used for a table (the parameters behind the parameter engine in the display result):Mysql>

MySQL Basic Operation explained

= ' AAA ' where id=1;mysql> Update huang.name set name= ' AAA ' where id=1;Query OK, 0 rows affected (0.01 sec)Rows matched:0 changed:0 warnings:0Delete table Data Delete form TB where id=1;Empty tables truncate TABLE db1.t1;Delete tables drop table db1.tb1;Delete database drop databases db1;Fix tables Repair table tb1 [use frm]; [Use frm] is an index file, the index is rebuilt;3. mysql Backup and recoveryUse mysqldump Backup, suitable for small amount of data;Backup mysqldump-uroot-p123456 db >

Translation "c++ Rvalue References explained"c++ rvalue Reference detailed Part1: overview

This article is about "C + + Rvalue References explained" The translation of the text, the original Thomas Becker.This article explained in detail the role of c++11 rvalue reference and the significance of the occurrence, but also by Scott Meyers Recommendation, the full text is divided into 11 parts, I will use spare time, respectively translated.Limited by the author's level, may be described a few proble

Android TextView Property Explained

centered.Android:hinttext the text message that is displayed when empty, you can set the color of the hint information by Textcolorhint. This property is used in EditView, but can also be used here.Android:imeoptions additional functions, set the action associated with the edit box in the lower right corner of the IME action, such as the lower right corner of the Actiondone will display a "done" instead of the default is a carriage return symbol. This is ex

The whole network most! detailed!tarjan algorithm explained.

The most detailed Tarjan algorithm explained in the whole network, I dare not say anything else. Anyway, other Tarjan algorithm explained, I looked at half a day to understand. I wrote this, read it once, found that the original Tarjan so simple!Tarjan algorithm, a magic algorithm about the connectivity of graphs. Based on DFS (di mage) algorithm, depth first search for a map. Attention! is a graph of direc

NetBeans Lookups explained!

https://dzone.com/articles/netbeans-lookups-explained————————————————————————————————————————————————————————Lookups is one of the most important parts of the NetBeans Platform. They ' re used almost everywhere and most of the time if you ask something on a mailing list the answer are "use lookups!" . Many times when the use of lookups is explained it's in a very specific context, e.g. selection management

The whole network most! detailed!tarjan algorithm explained. --reproduced from the road without the posterior

The most detailed Tarjan algorithm explained in the whole network, I dare not say anything else. Anyway, other Tarjan algorithm explained, I looked at half a day to understand. I wrote this, read it once, found that the original Tarjan so simple!Tarjan algorithm, a magic algorithm about the connectivity of graphs. Based on DFS (di mage) algorithm, depth first search for a map. Attention! is a graph of direc

In the remote linux system just configured, the CSS file can be read in firefox but cannot be explained. IE is normal!

In the remote linux system just configured, the CSS file can be read in firefox but cannot be explained. IE is normal! -- Linux general technology-Linux technology and application information. For details, refer to the following section. In the remote linux system just configured, the CSS file can be read in firefox but cannot be explained. IE is normal! For the same website, in the local (windows2003), th

The parameters and usage of useradd and usermod are explained in detail below!

The parameters and usage of useradd and usermod are explained in detail below!Speaking of the other two, about Linux password-related file storage location description/USR/BIN/PASSWD contains the passwd command./ETC/PASSWD contains user ID, user name, home directory, login shell, and finger informationThe/etc/security/passwd contains encrypted passwords and security information./etc/shdow Password storage location after user's encryptionAll right, bac

JVM principles explained and tuned

, a Survivor area accounted for the entire young generation of 1/5-xx:maxpermsize=n: Setting the persistent generation sizeCollector Settings-XX:+USESERIALGC: Setting up the serial collector-XX:+USEPARALLELGC: Setting up a parallel collector-XX:+USEPARALLEDLOLDGC: Setting up a parallel old generation collector-XX:+USECONCMARKSWEEPGC: Setting the concurrency CollectorGarbage collection Statistics-xx:+printgc-xx:+printgcdetails-xx:+printgctimestamps-xloggc:filenameParallel collector settings-xx:pa

Address mapping @RequestMapping usage explained (GO)

explained later);Method: Specifies the type of method requested, GET, POST, PUT, delete, and so on;2, Consumes,produces;Consumes: Specifies the type of submission to process the request (Content-type), such as Application/json, text/html;Produces: Specifies the type of content returned, only if the specified type is included in the (Accept) type in the request header;3, Params,headers;Params: Specifies that some parameter values must be included in t

Address mapping @RequestMapping usage explained (GO)

explained later);Method: Specifies the type of method requested, GET, POST, PUT, delete, and so on;2, Consumes,produces;Consumes: Specifies the type of submission to process the request (Content-type), such as Application/json, text/html;Produces: Specifies the type of content returned, only if the specified type is included in the (Accept) type in the request header;3, Params,headers;Params: Specifies that some parameter values must be included in t

Address mapping @RequestMapping usage explained (GO)

explained later);Method: Specifies the type of method requested, GET, POST, PUT, delete, and so on;2, Consumes,produces;Consumes: Specifies the type of submission to process the request (Content-type), such as Application/json, text/html;Produces: Specifies the type of content returned, only if the specified type is included in the (Accept) type in the request header;3, Params,headers;Params: Specifies that some parameter values must be included in t

Translation "c++ Rvalue References explained"c++ rvalue Reference detailed PART5: rvalue reference is right value?

For the fifth part of this document, please refer to the overview section: http://www.cnblogs.com/harrywong/p/cpp-rvalue-references-explained-introduction.html.Is the rvalue reference the right value?As before, an X class is given, allowing us to reload its copy constructor and copy assignment operators to implement the move semantics. Now consider the following:void foo (x x) { = x; // ...}An interesting question is, in the Foo function, which X'

Translation "c++ Rvalue References explained"c++ rvalue Reference detailed Part7:perfect Forwarding (perfect forwarding): question

For the seventh part of this document, please refer to the overview section: http://www.cnblogs.com/harrywong/p/cpp-rvalue-references-explained-introduction.html.Perfect Forwarding (Perfect forwarding): problemAnother problem that the rvalue reference behind the move semantics is used to solve is the perfect forwarding problem. Consider the following simple factory functions:Template shared_ptr Factory (Arg arg) { return Shared_ptrnew T (ARG));Obvi

Go SQL Server functions explained by some common DLLs

Tags: research trace title ORM CSDN SQL Server Design example data Transferred from: Leo_wlcnblogsSQL Server functions explained by some common DLLsIf your SQL Server is installed in the C drive, the following path is the storage path of the corresponding SQL Server version of the common DLL SQL2005 C:\Program Files\Microsoft SQL Server\90\sdk\assemblies\ SQL2008 C:\Program Files\Microsoft SQL Server\100\sdk\assemblies\ SQL2012 C:\Program Files\Mi

SQL injection principle explained, very good!

SQL Injection principle explained, very good! Original address: http://www.cnblogs.com/rush/archive/2011/12/31/2309203.html1.1.1 abstractRecently, the country's largest programmer community CSDN website user database was publicly released by hackers, 6 million of the user's login name and password was publicly disclosed, followed by a number of Web site user passwords were circulated in the network, in recent days to trigger a number of users of their

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