a certification self study

A Preliminary Study on the multi-language and a preliminary discussion on the language In the past few days, there have been a lot of free time. We have studied the many languages of Abp, which are interface-based dependency injection. Many ideas and methods are good, and we need to deeply understand and apply them, tr

bean的定义信息；Context命名空间的方法比较多，比如：resource-pattern 属性过滤特定的类；Regex 方法，采用正则表达式对目标的类名进行过滤等。Spring-tx-3.0.xsd用途：用于声明式事务配置定义命名空间： http://www.springframework.orghttp://www.springframework.org/schema/tx/spring-tx-3.0.xsdSpring-aop-3.0.xsd用途：AOP（面向切面）的配置定义命名空间： http://www.springframework.org/schema/aopSchema文件：http://www.springframework.org/schema/aop/spring-aop-3.0.xsdSpring-mvc-3.0.xsd用途：用于MVC的配置，spring3.0新增命名空间： http://www.springframework.org/schema/mvcSchema文件：http://www.springframework.org/schema/aop/

SPRING1 uses the DTD format, Spring2 later uses the schema format, using the schema format, supports different types of configuration has its own namespace, so that the configuration file has a better extensibility.No matter what, are both pros and cons, using the schema format, bean.xml file header declaration will be relatively complex very much, whenever I see these complex things, I feel the head of the complex up.As the disciple code says, "Kung

Inadvertently see the right way about MySQL, while there is free time to study up, found that there are quite a lot of places on the internet is not detailed enough, the study time also stuck for a while.Usage Prerequisites: Operating system for Windows Operating system version should not be too high, 2008

Kneeling for the regular match out the following content, the study for a long time no results.

Tags: good soft temp table space statistic Rand ATI needsA preliminary study of MYSQL SQL statement technique (i.)This article is a summary of some of the features that I recently learned about some of the SQL methods () that will be updated later: Rand and RAND (n) Implement the extraction of random rows and the principle of order by. Bit_and,bit_or,bit_count equal-bit operation method to achi

A preliminary study on Linux Drive model 2--device_driver 1, thinkingDevice_driver is also a kobject? , but you notice no, in the sys/directory has bus/, there is device/is no device_driver/,y? Why is it so designed? first look at the struct devic_driver;struct Device_driver {Const char *name;struct Bus_type *bus;...Int (*probe) (struct device *dev);Int (*remove

first parameter, you need to use ESP-8.Similarly we can understand payload = ' A ' *140 + p32 (systemaddr) + P32 (ret) + P32 (binshaddr) The meaning of this code, such as, to observe the small figure on the right :This way we can understand why/bin/sh is the first parameter and why system ("/bin/sh") returns to RET after execution.0x03Payload1 = ' a ' *140 + p32 (plt_write) + P32 (vulfun_addr) + P32 (1) +p

1.1 Beginning of studyFirst, to position themselves1. What is the purpose of studying this course?2. What post do you want to do after you finish your study?3. Which city will be developed after the completion of the studySecond, set a goal for yourself1. When will you finish learning?2. When to switch jobs3. What is the first salary?4, a year after how much, two

Tags: job hopping style setting course Mil Tool Target install CentOS virtual machine1.1 Beginning of studyFirst, to position themselves1. What is the purpose of studying this course?2. What post do you want to do after you finish your study?3. Which city will be developed after the completion of the studySecond, set a goal for yourself1. When will you finish learning?2. When to switch jobs3. What is the fi

/17523945 (5) Cool Breeze, "Building high-performance Database Cache Redis Master-slave Replication", http://database.51cto.com/art/201407/444555.htm (6) Wang Chengwei Podcast, "Redis Open Class for data optimization", http://bbs.itcast.cn/thread-26525-1-1.html (7) Beauty Dance, redis.conf description of Redis configuration file, http://blog.sina.com.cn/s/blog_636415010101970j.htmlAccessories download(1) Redisdemo.masterandslave:http://pan.baidu.com/s/1dd1nigt Transferred from: http://www.cnblog

preliminary discussion of Java objects wait (), notify (), Notifyall () And the synchronized in the thread. What needs to be said is that the synchronized call is actually an internal lock that contains only one condition.You will think when to use synchronized when to use the lock.1. In fact, it is best not to use two, because in our concurrent package, there is a synchronization queue, he will automatically help us to deal with the synchronization

efficiency and classification effect.A popular approach is to use evolutionary algorithms to optimize feature ranges.A suitable K-value selection, through a variety of heuristic algorithms.Both classification and regression are weighted according to distance measurements, making the neighboring values more average.SummarizeKNN algorithm is the simplest and most effective algorithm for classifying data, which can help us to quickly understand the basi

")));// 打印falseSystem.out.println(new BigDecimal("0.0").hashCode() == (new BigDecimal("0.00")).hashCode());// 打印0System.out.println(new BigDecimal("0.0").compareTo(new BigDecimal("0.00")));V. Use SCALE for DivisionBigDecimalThere is no limit to the precision of the object. If the result cannot be terminated, the divide method will be thrown ArithmeticException , such as 1/3 = 0.33333 .... Therefore, it is highly recommended to use overloaded methods divide(BigDecimal d, int scale, int roundMode)

quickly build your own website, you can also do mobile-based adaptive.data mining with crawlers, batch processing: The nature of the crawler is to imitate people to obtain web data, when you need to obtain a large amount of data, or keep getting, pytho can quickly do, reduce your repetitive work time. For example: micro-blog private messages robot, batch download American opera, run investment strategy, swipe cheap tickets, crawl suitable listings, s

, theemergence of Redis, to a large extent, compensates for the lack of memcached such key/value storage, in some cases can be a good complement to the relational database .3. Redis InstallationThe installation process for Redis is simple:(1) Download Redis installation package Redis-3.2.12.tar.gz:https://redis.io/download(2) Decompression: TAR-XZVF redis-3.2.12.tar.gz(3) Installation: sudo make Prefix=/usr

Dispatcha will run on DISPATCHB. At this point, if you pause Dispatcha run:Dispatch_suspend (Dispatcha);Will only halt the execution of the original block on the Dispatcha, and the DISPATCHB block is unaffected. If the DISPATCHB is paused, the run of Dispatcha is paused.Here are just a few examples of how flexible the dispatch queue can be, and in practice you will gradually explore its potential.The dispatch queue does not support cancel (cancel) an

- //Add User - Public static void useradd (User newuser) { - init (); + A.add (newuser); - } + A //Query Users at Public static void userquery (int ID) { - init (); - A.queryuser (ID); - } -}initialization function init () Gets the DAO layer object, which is the object that owns the rights to the database operation, and then invokes the method of the object to implement the user's indirectThe operation of the database, which

complete relational network G has been established. The following extracts the department objects in the above code as parameters, and gives a custom function init.igraph the user to establish a relational networkInit.graphLabelsIdsFromEdgesGGV (g) $label Gif (Rem.multi) {E (g) $weight G}G}The data for this parameter is the box that includes the point name and the line data. It is divided into from and to

(points[0][0], points[0][1]) My_turtle.end_fill ()defGet_mid (P1, p2):return((p1[0]+p2[0])/ 2, (p1[1]+p2[1])/ 2)defSierpinski (points, Degree, my_turtle): Color_map=[' Blue ',' Red ',' Green ',' White ',' Yellow ',' Violet ',' Orange '] Draw_triangle (points, Color_map[degree], My_turtle)ifDegree> 0: Sierpinski ([points[0], Get_mid (points[0], points[1]), Get_mid (points[0], points[2]), Degree-1, My_turtle) Sierpinski ([points[1], Get_mid (points[0], points[1]), Get_mid (points[1], points[2]),