Tips for Date reduction

Just think my contract what how long time expires, the number of fingers feel too tired, feel that write a program can also practice practicing, here GregorianCalendar and Calendar use is the same, just want to try more. Import Java.util.Calendar; Im

GROUP BY

Query order By,group by and having use (turn)(1) Order BYThe syntax for the ORDER BY clause is:SELECT Column1, SUM (Column2) from "List-of-tables"ORDER BY "Column-list" [ASC | DESC];[] = optionalAn order BY is an optional clause that allows you to di

Principles and techniques for DB2 recovery with transaction logs after a crash

After the system crashes, use the DB2 transaction log to recover the database. How many times have you encountered the error message "sql0946c The transaction log for the"? When trying to solve the problem, do you stop to think about the following tw

CHAPTER16 Performance Tuning and architecture-basic theory and tools

16.1 Performance Tuning theory 16.1.1 Basic Concepts Resources (Resource): The functional components of the physical server, some software resources can also be measured, such as thread pool, number of processes, and so on. System operation, requir

Retrieve MD5 encrypted password and MD5 encrypted database data __ Database

Sometimes, in the development process, if accidentally changed the project Administrator account password and forgot, there is the password in the database is MD5 encryption, this time how to do. The most rookie of me, just at the beginning is also v

Using Telnet for SMTP/POP3/FTP/NNTP (ZZ)

I realized that I could use Telnet to interact with the SMTP server. The SMTM server for MS also provides an interface for command-line interaction.HTTP server is also able to use Telnet to operate, but there is no command line echo. Using Telnet for

A simple description of the IO Base's object stream, print flow, standard IO, and scanner classes

Object flow: (serialization and deserialization)Serialization:Refers to the Java object data in the heap memory, in some way storing the object in a disk file or passing it to another network node (transmitted over the network). We call this process

Activiti Database Configuration error: ORA-12505, Tns:listener does not currently know to SID given in connect desc__ database

1, the problem When you start activiti-explorer when you configure the Activiti database, you find the general report "ORA-12505, Tns:listener does not currently know the SID given in Connect desc." 2, solve (1) using the instructions on the Web, mo

Java8 new time and date library and usage examples

Java8 introduced a new set of time and date APIs, and this essay will illustrate the API for learning Java8. Java. In the time package, the class is immutable and thread-safe. The new time and date APIs are located in Java.time, and the following are

How DOM, SAX, JDOM, dom4j, and pull work in parsing XML files and compare their pros and cons

1. DOM (Document Object model)(1) Dom is a set of specifications specified by the consortium, the core of the DOM is to process the data by the tree structure, the DOM parser reads the XML file and constructs an identical tree in memory, can specify

VBScript implements InputBox multiple input boxes and InputBox and CheckBox boxes

VBScript is not implemented InputBox multiple input boxes appear in the same dialog, but if you use IE, you can achieve the same effect. Found an example of an expert on the Internet, posted below <textarea cols= "rows=" name= "code" class= "VB" &

Unicode encoding and its implementation: UTF-16, Utf-8,and more__utf-8

http://blog.csdn.net/thl789/article/details/7506133Https://zhuanlan.zhihu.com/p/23654187?refer=dreawerHttp://www.ruanyifeng.com/blog/2007/10/ascii_unicode_and_utf-8.html UTF-8UTF-8 (8-bit Unicode Transformation Format) is a variable-length character

Learning notes: The Log (one of the best distributed technical articles I've ever read)

Preface This is a study note.The learning material comes from a log blog post from Jay Kreps.The original text is very long, but I persisted to read, the harvest is very much, also deeply to Jay's technical ability, the architecture ability and to t

Related Technical analysis of WEB printing

The people who do the web development will face a common problem, that is, print. Indeed, there are limitations to the printing of Web applications relative to Windows desktop applications, and technicians often encounter such or such requirements in

Good things to share: Talk about the system architecture of large high concurrent high load Web sites

Reprint please retain the Source: June-Lin Michael's blog (http://www.toplee.com/blog/?p=71)Trackback url:http://www.toplee.com/blog/wp-trackback.php?p=71 I have done in the Cernet dial-up access platform, and then in yahoo&3721 engaged in the se

Learning notes: The Log (one of the best distributed technical articles I've ever read)

Preface This is a study note.The learning material comes from a log blog post from Jay Kreps.The original text is very long, but I persisted to read, the harvest is very much, also deeply to Jay's technical ability, the architecture ability and to t

21 Best Open Source database __ Database

Abstract: Almost all software project development needs the support of the database, at present, with the rapid development of open source technology, more and more data suppliers choose Open Source database, contribute to the cause of open source.

. How to set Label (Label control) background to transparent __.net in net

There are several situations: 1. If the label control is not placed on another control, such as a pictures control or another container control, you can modify the label control's BackColor Property-> web-> Transparent 2. If the label contro

How DOM, SAX, JDOM, dom4j, and pull work in parsing XML files and compare their pros and cons

Turn from: http://blog.csdn.net/seu_calvin/article/details/52027484 1. DOM (document object model)(1) Dom is a set of specifications specified by the consortium, the core of the DOM is to process the data by the tree structure, the DOM parser reads

Base64 SHA1 MD5

Base64 Code 1:base64 is one of the most common encoding methods for transmitting 8Bit bytecode on the network, Base64 is a method of representing binary data based on 64 printable characters2:BASE64 encoding is a process from binary to character tha

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